From 891d9ddf78d5ef9325628a264c041df339012567 Mon Sep 17 00:00:00 2001
From: max bittker <maxbittker@gmail.com>
Date: Thu, 20 Jan 2022 22:43:21 -0500
Subject: [PATCH] rebuild

---
 build/matter.js     | 377 ++++++++++++++++++++++++++++++++++++++++----
 build/matter.min.js |   2 +-
 demo/index.html     |  22 +--
 3 files changed, 352 insertions(+), 49 deletions(-)

diff --git a/build/matter.js b/build/matter.js
index ae3bc3d..feb4e78 100644
--- a/build/matter.js
+++ b/build/matter.js
@@ -143,6 +143,9 @@ module.exports = Common;
     Common._warnedOnce = {};
     Common._decomp = null;
     
+    Common._2PI = 2 * Math.PI;
+    Common._3PI = 3 * Math.PI;
+
     /**
      * Extends the object in the first argument using the object in the second argument.
      * @method extend
@@ -378,6 +381,43 @@ module.exports = Common;
     Common.sign = function(value) {
         return value < 0 ? -1 : 1;
     };
+
+    /**
+     * Returns the normalised signed difference between the two angles in radians [-PI, PI].
+     * @method angleDiff
+     * @param {number} angleA the first angle in radians
+     * @param {number} angleB the second angle in radians
+     * @return {number} the normalised signed difference
+     */
+    Common.angleDiff = function(angleA, angleB) {
+        return ((((angleA - angleB) % Common._2PI) + Common._3PI) % Common._2PI) - Math.PI;
+    };
+
+    /**
+     * Clamps the given `angle` in radians between `angleMin` and `angleMax` inclusive.
+     * @method clampAngle
+     * @param {number} angleMin the angle minimum in radians
+     * @param {number} angleMax the angle maximum in radians
+     * @return {number} the clamped angle
+     */
+    Common.clampAngle = function(angle, angleMin, angleMax) {
+        if (angleMax - angleMin === 0) {
+            return angleMax;
+        }
+
+        var deltaMin = Common.angleDiff(angle, angleMin);
+        var deltaMax = Common.angleDiff(angle, angleMax);
+
+        if (deltaMin > 0 && deltaMax < 0) {
+            return angle;
+        }
+
+        if (Math.abs(deltaMin) < Math.abs(deltaMax)) {
+            return angle - deltaMin;
+        }
+
+        return angle - deltaMax;
+    };
     
     /**
      * Returns the current timestamp since the time origin (e.g. from page load).
@@ -4347,8 +4387,12 @@ var Contact = __webpack_require__(17);
 
 /**
 * The `Matter.Constraint` module contains methods for creating and manipulating constraints.
-* Constraints are used for specifying that a fixed distance must be maintained between two bodies (or a body and a fixed world-space position).
-* The stiffness of constraints can be modified to create springs or elastic.
+* 
+* Constraints are used for specifying that a fixed distance or angle must be maintained between bodies or fixed points.
+* 
+* The stiffness and damping can be modified for a spring-like effect.
+*
+* The angle range and angle stiffness can also be limited if needed.
 *
 * See the included usage [examples](https://github.com/liabru/matter-js/tree/master/examples).
 *
@@ -4370,15 +4414,23 @@ var Common = __webpack_require__(0);
 
     Constraint._warming = 0.4;
     Constraint._torqueDampen = 1;
+    Constraint._angleLimitDampen = 0.5;
     Constraint._minLength = 0.000001;
 
     /**
      * Creates a new constraint.
-     * All properties have default values, and many are pre-calculated automatically based on other properties.
-     * To simulate a revolute constraint (or pin joint) set `length: 0` and a high `stiffness` value (e.g. `0.7` or above).
-     * If the constraint is unstable, try lowering the `stiffness` value and / or increasing `engine.constraintIterations`.
-     * For compound bodies, constraints must be applied to the parent body (not one of its parts).
-     * See the properties section below for detailed information on what you can pass via the `options` object.
+     * 
+     * All properties have default values and some may be calculated automatically based on other properties.
+     * 
+     * To simulate a pin constraint (or revolute joint) set `length: 0` and a high `stiffness` value (e.g. `0.7` or above).
+     * 
+     * To limit the range of angles of the constraint see the set of angle properties.
+     * 
+     * If the constraint is unstable, try lowering the `stiffness` value or increasing `engine.constraintIterations`.
+     * 
+     * For compound bodies, constraints must be applied to the parent body and not its parts.
+     * 
+     * See the properties section which may be set through the `options` object.
      * @method create
      * @param {} options
      * @return {constraint} constraint
@@ -4395,8 +4447,9 @@ var Common = __webpack_require__(0);
         // calculate static length using initial world space points
         var initialPointA = constraint.bodyA ? Vector.add(constraint.bodyA.position, constraint.pointA) : constraint.pointA,
             initialPointB = constraint.bodyB ? Vector.add(constraint.bodyB.position, constraint.pointB) : constraint.pointB,
-            length = Vector.magnitude(Vector.sub(initialPointA, initialPointB));
-    
+            length = Vector.magnitude(Vector.sub(initialPointA, initialPointB)),
+            angle = Vector.angle(initialPointA, initialPointB);
+        
         constraint.length = typeof constraint.length !== 'undefined' ? constraint.length : length;
 
         // option defaults
@@ -4406,17 +4459,32 @@ var Common = __webpack_require__(0);
         constraint.stiffness = constraint.stiffness || (constraint.length > 0 ? 1 : 0.7);
         constraint.damping = constraint.damping || 0;
         constraint.angularStiffness = constraint.angularStiffness || 0;
-        constraint.angleA = constraint.bodyA ? constraint.bodyA.angle : constraint.angleA;
-        constraint.angleB = constraint.bodyB ? constraint.bodyB.angle : constraint.angleB;
+        constraint.angleAPrev = constraint.bodyA ? constraint.bodyA.angle : constraint.angleAPrev;
+        constraint.angleBPrev = constraint.bodyB ? constraint.bodyB.angle : constraint.angleBPrev;
         constraint.plugin = {};
 
+        constraint.angleA = typeof constraint.angleA !== 'undefined' ? 
+            constraint.angleA : (constraint.bodyA ? 0 : angle);
+
+        constraint.angleAStiffness = constraint.angleAStiffness || 0;
+        constraint.angleAMin = constraint.angleAMin || 0;
+        constraint.angleAMax = constraint.angleAMax || 0;
+
+        constraint.angleB = typeof constraint.angleB !== 'undefined' ? 
+            constraint.angleB : (constraint.bodyB ? 0 : angle);
+
+        constraint.angleBStiffness = constraint.angleBStiffness || 0;
+        constraint.angleBMin = constraint.angleBMin || 0;
+        constraint.angleBMax = constraint.angleBMax || 0;
+
         // render
         var render = {
             visible: true,
             lineWidth: 2,
             strokeStyle: '#ffffff',
             type: 'line',
-            anchors: true
+            anchors: true,
+            angles: true
         };
 
         if (constraint.length === 0 && constraint.stiffness > 0.1) {
@@ -4501,14 +4569,14 @@ var Common = __webpack_require__(0);
 
         // update reference angle
         if (bodyA && !bodyA.isStatic) {
-            Vector.rotate(pointA, bodyA.angle - constraint.angleA, pointA);
-            constraint.angleA = bodyA.angle;
+            Vector.rotate(pointA, bodyA.angle - constraint.angleAPrev, pointA);
+            constraint.angleAPrev = bodyA.angle;
         }
         
         // update reference angle
         if (bodyB && !bodyB.isStatic) {
-            Vector.rotate(pointB, bodyB.angle - constraint.angleB, pointB);
-            constraint.angleB = bodyB.angle;
+            Vector.rotate(pointB, bodyB.angle - constraint.angleBPrev, pointB);
+            constraint.angleBPrev = bodyB.angle;
         }
 
         var pointAWorld = pointA,
@@ -4535,11 +4603,29 @@ var Common = __webpack_require__(0);
             massTotal = (bodyA ? bodyA.inverseMass : 0) + (bodyB ? bodyB.inverseMass : 0),
             inertiaTotal = (bodyA ? bodyA.inverseInertia : 0) + (bodyB ? bodyB.inverseInertia : 0),
             resistanceTotal = massTotal + inertiaTotal,
+            angleAStiffness = (constraint.angleAStiffness < 1 ? constraint.angleAStiffness * timeScale : constraint.angleAStiffness) * Constraint._angleLimitDampen,
+            angleBStiffness = (constraint.angleBStiffness < 1 ? constraint.angleBStiffness * timeScale : constraint.angleBStiffness) * Constraint._angleLimitDampen,
             torque,
             share,
             normal,
             normalVelocity,
-            relativeVelocity;
+            relativeVelocity,
+            angleLimitPointA,
+            angleLimitPointB;
+
+        if (constraint.angleAStiffness) {
+            angleLimitPointA = Constraint.solveAngleLimits(
+                constraint, bodyA, constraint.angleA, constraint.angleAMin, 
+                constraint.angleAMax, delta, -1, currentLength, pointAWorld, pointBWorld
+            );
+        }
+
+        if (constraint.angleBStiffness) {
+            angleLimitPointB = Constraint.solveAngleLimits(
+                constraint, bodyB, constraint.angleB, constraint.angleBMin, 
+                constraint.angleBMax, delta, 1, currentLength, pointBWorld, pointAWorld
+            );
+        }
 
         if (constraint.damping) {
             var zero = Vector.create();
@@ -4556,6 +4642,12 @@ var Common = __webpack_require__(0);
         if (bodyA && !bodyA.isStatic) {
             share = bodyA.inverseMass / massTotal;
 
+            // temporarily add angular limit force from pointB if pinned
+            if (angleLimitPointB && (!bodyB || bodyB.isStatic)) {
+                force.x -= angleLimitPointB.x * angleBStiffness;
+                force.y -= angleLimitPointB.y * angleBStiffness;
+            }
+
             // keep track of applied impulses for post solving
             bodyA.constraintImpulse.x -= force.x * share;
             bodyA.constraintImpulse.y -= force.y * share;
@@ -4570,15 +4662,34 @@ var Common = __webpack_require__(0);
                 bodyA.positionPrev.y -= constraint.damping * normal.y * normalVelocity * share;
             }
 
-            // apply torque
+            // find torque to apply
             torque = (Vector.cross(pointA, force) / resistanceTotal) * Constraint._torqueDampen * bodyA.inverseInertia * (1 - constraint.angularStiffness);
+
+            // add any torque from angular limit at pointA
+            if (angleLimitPointA) {
+                torque -= angleLimitPointA.angle * angleAStiffness;
+            }
+
+            // apply torque
             bodyA.constraintImpulse.angle -= torque;
             bodyA.angle -= torque;
+
+            // remove angular limit from pointB
+            if (angleLimitPointB && (!bodyB || bodyB.isStatic)) {
+                force.x += angleLimitPointB.x * angleBStiffness;
+                force.y += angleLimitPointB.y * angleBStiffness;
+            }
         }
 
         if (bodyB && !bodyB.isStatic) {
             share = bodyB.inverseMass / massTotal;
 
+            // add angular limit force from pointA if pinned
+            if (angleLimitPointA && (!bodyA || bodyA.isStatic)) {
+                force.x += angleLimitPointA.x * angleAStiffness;
+                force.y += angleLimitPointA.y * angleAStiffness;
+            }
+
             // keep track of applied impulses for post solving
             bodyB.constraintImpulse.x += force.x * share;
             bodyB.constraintImpulse.y += force.y * share;
@@ -4593,8 +4704,15 @@ var Common = __webpack_require__(0);
                 bodyB.positionPrev.y += constraint.damping * normal.y * normalVelocity * share;
             }
 
-            // apply torque
+            // find torque to apply
             torque = (Vector.cross(pointB, force) / resistanceTotal) * Constraint._torqueDampen * bodyB.inverseInertia * (1 - constraint.angularStiffness);
+            
+            // add any torque from angular limit at pointB
+            if (angleLimitPointB) {
+                torque += angleLimitPointB.angle * angleBStiffness;
+            }
+            
+            // apply torque
             bodyB.constraintImpulse.angle += torque;
             bodyB.angle += torque;
         }
@@ -4655,8 +4773,10 @@ var Common = __webpack_require__(0);
      */
     Constraint.pointAWorld = function(constraint) {
         return {
-            x: (constraint.bodyA ? constraint.bodyA.position.x : 0) + constraint.pointA.x,
-            y: (constraint.bodyA ? constraint.bodyA.position.y : 0) + constraint.pointA.y
+            x: (constraint.bodyA ? constraint.bodyA.position.x : 0) 
+                + (constraint.pointA ? constraint.pointA.x : 0),
+            y: (constraint.bodyA ? constraint.bodyA.position.y : 0) 
+                + (constraint.pointA ? constraint.pointA.y : 0)
         };
     };
 
@@ -4668,8 +4788,50 @@ var Common = __webpack_require__(0);
      */
     Constraint.pointBWorld = function(constraint) {
         return {
-            x: (constraint.bodyB ? constraint.bodyB.position.x : 0) + constraint.pointB.x,
-            y: (constraint.bodyB ? constraint.bodyB.position.y : 0) + constraint.pointB.y
+            x: (constraint.bodyB ? constraint.bodyB.position.x : 0) 
+                + (constraint.pointB ? constraint.pointB.x : 0),
+            y: (constraint.bodyB ? constraint.bodyB.position.y : 0) 
+                + (constraint.pointB ? constraint.pointB.y : 0)
+        };
+    };
+    
+    /**
+     * Solves angle limits on the constraint.
+     * @private
+     * @method solveAngleLimits
+     */
+    Constraint.solveAngleLimits = function(constraint, body, angle, angleMin, angleMax, delta, direction, currentLength, pointAWorld, pointBWorld) {
+        var currentAngle = (body ? body.angle : 0) + (constraint.length > 0 ? angle : 0),
+            min = angleMin < angleMax ? angleMin : angleMax,
+            max = angleMax > angleMin ? angleMax : angleMin,
+            angleNormal = { x: Math.cos(currentAngle), y: Math.sin(currentAngle) },
+            angleDelta;
+
+        if (constraint.length === 0) {
+            // use absolute angle for pin constraints
+            angleDelta = Common.angleDiff(angle, currentAngle);
+        } else {
+            // otherwise use relative angle
+            angleDelta = Math.atan2(
+                angleNormal.x * delta.y * direction - angleNormal.y * delta.x * direction,
+                angleNormal.x * delta.x * direction + angleNormal.y * delta.y * direction
+            );
+        }
+
+        // no impulse required if angle within limits
+        if (angleDelta > min && angleDelta < max) {
+            return null;
+        }
+
+        // find the clamped angle and clamp the normal
+        var angleClamped = Common.clampAngle(angleDelta, min, max),
+            normalLimited = Vector.rotate(angleNormal, angleClamped);
+
+        // return the impulses required to correct the angle
+        return {
+            x: pointAWorld.x + normalLimited.x * currentLength - pointBWorld.x, 
+            y: pointAWorld.y + normalLimited.y * currentLength - pointBWorld.y,
+            angle: Common.angleDiff(angleDelta, angleClamped)
         };
     };
 
@@ -4680,7 +4842,7 @@ var Common = __webpack_require__(0);
     */
 
     /**
-     * An integer `Number` uniquely identifying number generated in `Composite.create` by `Common.nextId`.
+     * An integer `Number` uniquely identifying number generated in `Constraint.create` by `Common.nextId`.
      *
      * @property id
      * @type number
@@ -4754,6 +4916,14 @@ var Common = __webpack_require__(0);
      * @default true
      */
 
+    /**
+     * A `Boolean` that defines if the constraint's anglular limits should be rendered.
+     *
+     * @property render.angles
+     * @type boolean
+     * @default true
+     */
+
     /**
      * The first possible `Body` that this constraint is attached to.
      *
@@ -4788,7 +4958,9 @@ var Common = __webpack_require__(0);
 
     /**
      * A `Number` that specifies the stiffness of the constraint, i.e. the rate at which it returns to its resting `constraint.length`.
+     * 
      * A value of `1` means the constraint should be very stiff.
+     * 
      * A value of `0.2` means the constraint acts like a soft spring.
      *
      * @property stiffness
@@ -4799,8 +4971,11 @@ var Common = __webpack_require__(0);
     /**
      * A `Number` that specifies the damping of the constraint, 
      * i.e. the amount of resistance applied to each body based on their velocities to limit the amount of oscillation.
+     * 
      * Damping will only be apparent when the constraint also has a very low `stiffness`.
+     * 
      * A value of `0.1` means the constraint will apply heavy damping, resulting in little to no oscillation.
+     * 
      * A value of `0` means the constraint will apply no damping.
      *
      * @property damping
@@ -4810,12 +4985,121 @@ var Common = __webpack_require__(0);
 
     /**
      * A `Number` that specifies the target resting length of the constraint. 
+     * 
      * It is calculated automatically in `Constraint.create` from initial positions of the `constraint.bodyA` and `constraint.bodyB`.
      *
      * @property length
      * @type number
      */
 
+    /**
+     * A `Number` in radians that specifies the limiting angle of the constraint about `constraint.pointA`.
+     * 
+     * Only applies if `constraint.angleAStiffness > 0`.
+     * 
+     * Defaults to the initial angle of the constraint or `0`.
+     * 
+     * The angle is relative to `constraint.bodyA.angle` if `constraint.bodyA` is set, otherwise is absolute.
+     * 
+     * When absolute the angle is measured between the vector `constraint.pointA - constraint.pointB` and the x-axis.
+     *
+     * @property angleA
+     * @type number
+     * @default the initial relative constraint angle
+     */
+
+    /**
+     * A `Number` that specifies the stiffness of angular limits about `constraint.pointA`.  
+     * 
+     * A value of `0` (default) means the constraint will not limit the angle.  
+     * 
+     * A value of `0.01` means the constraint will softly limit the angle.  
+     * 
+     * A value of `1` means the constraint will rigidly limit the angle.  
+     *
+     * @property angleAStiffness
+     * @type number
+     * @default 0
+     */
+
+    /**
+     * A `Number` in radians that specifies the lower angular limit 
+     * about `constraint.pointA` relative to `constraint.angleA`.  
+     * 
+     * A value of `-0.5` means the constraint is limited to `0.5` radians 
+     * anti-clockwise of `constraint.angleA`, or clockwise if the value is positive.
+     *
+     * @property angleAMin
+     * @type number
+     * @default 0
+     */
+
+    /**
+     * A `Number` in radians that specifies the upper angular limit 
+     * about `constraint.pointA` relative to `constraint.angleA`.
+     * 
+     * A value of `-0.5` means the constraint is limited to `0.5` radians 
+     * anti-clockwise of `constraint.angleA`, or clockwise if the value is positive.
+     *
+     * @property angleAMax
+     * @type number
+     * @default 0
+     */
+
+    /**
+     * A `Number` in radians that specifies the limiting angle of the constraint about `constraint.pointB`.
+     * 
+     * Only applies if `constraint.angleBStiffness > 0`.
+     * 
+     * Defaults to the initial angle of the constraint or `0`.
+     * 
+     * The angle is relative to `constraint.bodyB.angle` if `constraint.bodyB` is set, otherwise is absolute.
+     * 
+     * When absolute the angle is measured between the vector `constraint.pointA - constraint.pointB` and the x-axis.
+     *
+     * @property angleB
+     * @type number
+     * @default the initial relative constraint angle
+     */
+
+    /**
+     * A `Number` that specifies the stiffness of angular limits about `constraint.pointB`.  
+     * 
+     * A value of `0` (default) means the constraint will not limit the angle.  
+     * 
+     * A value of `0.01` means the constraint will softly limit the angle.  
+     * 
+     * A value of `1` means the constraint will rigidly limit the angle.  
+     *
+     * @property angleBStiffness
+     * @type number
+     * @default 0
+     */
+
+    /**
+     * A `Number` in radians that specifies the lower angular limit 
+     * about `constraint.pointB` relative to `constraint.angleB`.  
+     * 
+     * A value of `-0.5` means the constraint is limited to `0.5` radians 
+     * anti-clockwise of `constraint.angleB`, or clockwise if the value is positive.
+     *
+     * @property angleBMin
+     * @type number
+     * @default 0
+     */
+
+    /**
+     * A `Number` in radians that specifies the upper angular limit 
+     * about `constraint.pointB` relative to `constraint.angleB`.
+     * 
+     * A value of `-0.5` means the constraint is limited to `0.5` radians 
+     * anti-clockwise of `constraint.angleB`, or clockwise if the value is positive.
+     *
+     * @property angleBMax
+     * @type number
+     * @default 0
+     */
+
     /**
      * An object reserved for storing plugin-specific properties.
      *
@@ -6070,7 +6354,6 @@ var Mouse = __webpack_require__(13);
      */
     Render.create = function(options) {
         var defaults = {
-            controller: Render,
             engine: null,
             element: null,
             canvas: null,
@@ -6142,6 +6425,7 @@ var Mouse = __webpack_require__(13);
         };
 
         // for temporary back compatibility only
+        render.controller = Render;
         render.options.showBroadphase = false;
 
         if (render.options.pixelRatio !== 1) {
@@ -6150,8 +6434,6 @@ var Mouse = __webpack_require__(13);
 
         if (Common.isElement(render.element)) {
             render.element.appendChild(render.canvas);
-        } else if (!render.canvas.parentNode) {
-            Common.log('Render.create: options.element was undefined, render.canvas was created but not appended', 'warn');
         }
 
         return render;
@@ -6675,17 +6957,17 @@ var Mouse = __webpack_require__(13);
                 start = constraint.pointA;
             }
 
+            if (bodyB) {
+                end = Vector.add(bodyB.position, constraint.pointB);
+            } else {
+                end = constraint.pointB;
+            }
+
             if (constraint.render.type === 'pin') {
                 c.beginPath();
                 c.arc(start.x, start.y, 3, 0, 2 * Math.PI);
                 c.closePath();
             } else {
-                if (bodyB) {
-                    end = Vector.add(bodyB.position, constraint.pointB);
-                } else {
-                    end = constraint.pointB;
-                }
-
                 c.beginPath();
                 c.moveTo(start.x, start.y);
 
@@ -6722,6 +7004,32 @@ var Mouse = __webpack_require__(13);
                 c.closePath();
                 c.fill();
             }
+
+            if (constraint.render.angles && constraint.angleAStiffness) {
+                var relativeAngle = (constraint.length > 0 && constraint.bodyA ? constraint.bodyA.angle : 0) + constraint.angleA;
+                c.beginPath();
+                c.moveTo(start.x, start.y);
+                c.arc(start.x, start.y, 12, relativeAngle + constraint.angleAMin, 
+                    relativeAngle + constraint.angleAMax + 0.0001, constraint.angleAMin <= constraint.angleAMax);
+                c.lineTo(start.x, start.y);
+                c.closePath();
+                c.strokeStyle = 'rgba(255,255,255,' + (0.3 + 0.3 * constraint.angleAStiffness) + ')';
+                c.lineWidth = 1.2;
+                c.stroke();
+            }
+
+            if (constraint.render.angles && constraint.angleBStiffness) {
+                var relativeAngle = (constraint.length > 0 && constraint.bodyB ? constraint.bodyB.angle : 0) + constraint.angleB;
+                c.beginPath();
+                c.moveTo(end.x, end.y);
+                c.arc(end.x, end.y, 12, relativeAngle + constraint.angleBMin,
+                    relativeAngle + constraint.angleBMax + 0.0001, constraint.angleBMin <= constraint.angleBMax);
+                c.lineTo(end.x, end.y);
+                c.closePath();
+                c.strokeStyle = 'rgba(255,255,255,' + (0.3 + 0.3 * constraint.angleBStiffness) + ')';
+                c.lineWidth = 1.2;
+                c.stroke();
+            }
         }
     };
 
@@ -7551,6 +7859,7 @@ var Mouse = __webpack_require__(13);
     /**
      * A back-reference to the `Matter.Render` module.
      *
+     * @deprecated
      * @property controller
      * @type render
      */
@@ -9852,7 +10161,7 @@ var Bounds = __webpack_require__(1);
                                 constraint.pointA = mouse.position;
                                 constraint.bodyB = mouseConstraint.body = body;
                                 constraint.pointB = { x: mouse.position.x - body.position.x, y: mouse.position.y - body.position.y };
-                                constraint.angleB = body.angle;
+                                constraint.angleBPrev = body.angle;
 
                                 Sleeping.set(body, false);
                                 Events.trigger(mouseConstraint, 'startdrag', { mouse: mouse, body: body });
diff --git a/build/matter.min.js b/build/matter.min.js
index 29d25db..c12baee 100644
--- a/build/matter.min.js
+++ b/build/matter.min.js
@@ -3,4 +3,4 @@
  * http://brm.io/matter-js/
  * License MIT
  */
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e=function(e,t){t=t||{},i.set(e,{bounds:e.bounds||l.create(e.vertices),positionPrev:e.positionPrev||r.clone(e.position),anglePrev:e.anglePrev||e.angle,vertices:e.vertices,parts:e.parts||[e],isStatic:e.isStatic,isSleeping:e.isSleeping,parent:e.parent||e}),o.rotate(e.vertices,e.angle,e.position),c.rotate(e.axes,e.angle),l.update(e.bounds,e.vertices,e.velocity),i.set(e,{axes:t.axes||e.axes,area:t.area||e.area,mass:t.mass||e.mass,inertia:t.inertia||e.inertia});var n=e.isStatic?"#14151f":s.choose(["#f19648","#f5d259","#f55a3c","#063e7b","#ececd1"]),a=e.isStatic?"#555":"#ccc",u=e.isStatic&&null===e.render.fillStyle?1:0;e.render.fillStyle=e.render.fillStyle||n,e.render.strokeStyle=e.render.strokeStyle||a,e.render.lineWidth=e.render.lineWidth||u,e.render.sprite.xOffset+=-(e.bounds.min.x-e.position.x)/(e.bounds.max.x-e.bounds.min.x),e.render.sprite.yOffset+=-(e.bounds.min.y-e.position.y)/(e.bounds.max.y-e.bounds.min.y)};i.set=function(e,t,n){var o;for(o in"string"==typeof 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i=e.parts[n];i.isStatic=t,t?(i._original={restitution:i.restitution,friction:i.friction,mass:i.mass,inertia:i.inertia,density:i.density,inverseMass:i.inverseMass,inverseInertia:i.inverseInertia},i.restitution=0,i.friction=1,i.mass=i.inertia=i.density=1/0,i.inverseMass=i.inverseInertia=0,i.positionPrev.x=i.position.x,i.positionPrev.y=i.position.y,i.anglePrev=i.angle,i.angularVelocity=0,i.speed=0,i.angularSpeed=0,i.motion=0):i._original&&(i.restitution=i._original.restitution,i.friction=i._original.friction,i.mass=i._original.mass,i.inertia=i._original.inertia,i.density=i._original.density,i.inverseMass=i._original.inverseMass,i.inverseInertia=i._original.inverseInertia,i._original=null)}},i.setMass=function(e,t){var n=e.inertia/(e.mass/6);e.inertia=n*(t/6),e.inverseInertia=1/e.inertia,e.mass=t,e.inverseMass=1/e.mass,e.density=e.mass/e.area},i.setDensity=function(e,t){i.setMass(e,t*e.area),e.density=t},i.setInertia=function(e,t){e.inertia=t,e.inverseInertia=1/e.inertia},i.setVertices=function(e,t){t[0].body===e?e.vertices=t:e.vertices=o.create(t,e),e.axes=c.fromVertices(e.vertices),e.area=o.area(e.vertices),i.setMass(e,e.density*e.area);var n=o.centre(e.vertices);o.translate(e.vertices,n,-1),i.setInertia(e,i._inertiaScale*o.inertia(e.vertices,e.mass)),o.translate(e.vertices,e.position),l.update(e.bounds,e.vertices,e.velocity)},i.setParts=function(e,t,n){var r;for(t=t.slice(0),e.parts.length=0,e.parts.push(e),e.parent=e,r=0;r<t.length;r++){var a=t[r];a!==e&&(a.parent=e,e.parts.push(a))}if(1!==e.parts.length){if(n=void 0===n||n){var s=[];for(r=0;r<t.length;r++)s=s.concat(t[r].vertices);o.clockwiseSort(s);var l=o.hull(s),c=o.centre(l);i.setVertices(e,l),o.translate(e.vertices,c)}var 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a=e.parts[i];a.angle+=n,o.rotate(a.vertices,n,e.position),c.rotate(a.axes,n),l.update(a.bounds,a.vertices,e.velocity),i>0&&r.rotateAbout(a.position,n,e.position,a.position)}},i.setVelocity=function(e,t){e.positionPrev.x=e.position.x-t.x,e.positionPrev.y=e.position.y-t.y,e.velocity.x=t.x,e.velocity.y=t.y,e.speed=r.magnitude(e.velocity)},i.setAngularVelocity=function(e,t){e.anglePrev=e.angle-t,e.angularVelocity=t,e.angularSpeed=Math.abs(e.angularVelocity)},i.translate=function(e,t){i.setPosition(e,r.add(e.position,t))},i.rotate=function(e,t,n){if(n){var o=Math.cos(t),r=Math.sin(t),a=e.position.x-n.x,s=e.position.y-n.y;i.setPosition(e,{x:n.x+(a*o-s*r),y:n.y+(a*r+s*o)}),i.setAngle(e,e.angle+t)}else i.setAngle(e,e.angle+t)},i.scale=function(e,t,n,r){var a=0,s=0;r=r||e.position;for(var u=0;u<e.parts.length;u++){var d=e.parts[u];o.scale(d.vertices,t,n,r),d.axes=c.fromVertices(d.vertices),d.area=o.area(d.vertices),i.setMass(d,e.density*d.area),o.translate(d.vertices,{x:-d.position.x,y:-d.position.y}),i.setInertia(d,i._inertiaScale*o.inertia(d.vertices,d.mass)),o.translate(d.vertices,{x:d.position.x,y:d.position.y}),u>0&&(a+=d.area,s+=d.inertia),d.position.x=r.x+(d.position.x-r.x)*t,d.position.y=r.y+(d.position.y-r.y)*n,l.update(d.bounds,d.vertices,e.velocity)}e.parts.length>1&&(e.area=a,e.isStatic||(i.setMass(e,e.density*a),i.setInertia(e,s))),e.circleRadius&&(t===n?e.circleRadius*=t:e.circleRadius=null)},i.update=function(e,t,n,i){var 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i=t.x-e.position.x,o=t.y-e.position.y;e.torque+=i*n.y-o*n.x},i._totalProperties=function(e){for(var t={mass:0,area:0,inertia:0,centre:{x:0,y:0}},n=1===e.parts.length?0:1;n<e.parts.length;n++){var i=e.parts[n],o=i.mass!==1/0?i.mass:1;t.mass+=o,t.area+=i.area,t.inertia+=i.inertia,t.centre=r.add(t.centre,r.mult(i.position,o))}return t.centre=r.div(t.centre,t.mass),t}}()},function(e,t,n){var i={};e.exports=i;var o=n(4);i._motionWakeThreshold=.18,i._motionSleepThreshold=.08,i._minBias=.9,i.update=function(e,t){for(var n=t*t*t,o=0;o<e.length;o++){var r=e[o],a=r.speed*r.speed+r.angularSpeed*r.angularSpeed;if(0===r.force.x&&0===r.force.y){var s=Math.min(r.motion,a),l=Math.max(r.motion,a);r.motion=i._minBias*s+(1-i._minBias)*l,r.sleepThreshold>0&&r.motion<i._motionSleepThreshold*n?(r.sleepCounter+=1,r.sleepCounter>=r.sleepThreshold&&i.set(r,!0)):r.sleepCounter>0&&(r.sleepCounter-=1)}else i.set(r,!1)}},i.afterCollisions=function(e,t){for(var n=t*t*t,o=0;o<e.length;o++){var 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m=i._findSupports(e,t,d,1),g=0;if(s.contains(e.vertices,m[0])&&(p[g++]=m[0]),s.contains(e.vertices,m[1])&&(p[g++]=m[1]),g<2){var x=i._findSupports(t,e,d,-1);s.contains(t.vertices,x[0])&&(p[g++]=x[0]),g<2&&s.contains(t.vertices,x[1])&&(p[g++]=x[1])}return 0===g&&(p[g++]=m[0]),p.length=g,o},i._overlapAxes=function(e,t,n,i){var o,r,a,s,l,c,u=t.length,d=n.length,p=t[0].x,f=t[0].y,v=n[0].x,y=n[0].y,m=i.length,g=Number.MAX_VALUE,x=0;for(l=0;l<m;l++){var h=i[l],b=h.x,S=h.y,w=p*b+f*S,A=v*b+y*S,P=w,C=A;for(c=1;c<u;c+=1)(s=t[c].x*b+t[c].y*S)>P?P=s:s<w&&(w=s);for(c=1;c<d;c+=1)(s=n[c].x*b+n[c].y*S)>C?C=s:s<A&&(A=s);if((o=(r=P-A)<(a=C-w)?r:a)<g&&(g=o,x=l,o<=0))break}e.axis=i[x],e.overlap=g},i._projectToAxis=function(e,t,n){for(var i=t[0].x*n.x+t[0].y*n.y,o=i,r=1;r<t.length;r+=1){var a=t[r].x*n.x+t[r].y*n.y;a>o?o=a:a<i&&(i=a)}e.min=i,e.max=o},i._findSupports=function(e,t,n,i){var r,a,s,l,c,u=t.vertices,d=u.length,p=e.position.x,f=e.position.y,v=n.x*i,y=n.y*i,m=Number.MAX_VALUE;for(c=0;c<d;c+=1)(l=v*(p-(a=u[c]).x)+y*(f-a.y))<m&&(m=l,r=a);return m=v*(p-(s=u[(d+r.index-1)%d]).x)+y*(f-s.y),v*(p-(a=u[(r.index+1)%d]).x)+y*(f-a.y)<m?(o[0]=r,o[1]=a,o):(o[0]=r,o[1]=s,o)}},function(e,t,n){var i={};e.exports=i;var o=n(17);i.create=function(e,t){var n=e.bodyA,o=e.bodyB,r={id:i.id(n,o),bodyA:n,bodyB:o,collision:e,contacts:[],activeContacts:[],separation:0,isActive:!0,confirmedActive:!0,isSensor:n.isSensor||o.isSensor,timeCreated:t,timeUpdated:t,inverseMass:0,friction:0,frictionStatic:0,restitution:0,slop:0};return i.update(r,e,t),r},i.update=function(e,t,n){var i=e.contacts,r=t.supports,a=e.activeContacts,s=t.parentA,l=t.parentB,c=s.vertices.length;e.isActive=!0,e.timeUpdated=n,e.collision=t,e.separation=t.depth,e.inverseMass=s.inverseMass+l.inverseMass,e.friction=s.friction<l.friction?s.friction:l.friction,e.frictionStatic=s.frictionStatic>l.frictionStatic?s.frictionStatic:l.frictionStatic,e.restitution=s.restitution>l.restitution?s.restitution:l.restitution,e.slop=s.slop>l.slop?s.slop:l.slop,t.pair=e,a.length=0;for(var u=0;u<r.length;u++){var d=r[u],p=d.body===s?d.index:c+d.index,f=i[p];f?a.push(f):a.push(i[p]=o.create(d))}},i.setActive=function(e,t,n){t?(e.isActive=!0,e.timeUpdated=n):(e.isActive=!1,e.activeContacts.length=0)},i.id=function(e,t){return e.id<t.id?"A"+e.id+"B"+t.id:"A"+t.id+"B"+e.id}},function(e,t,n){var i={};e.exports=i;var o=n(3),r=n(2),a=n(7),s=n(1),l=n(11),c=n(0);i._warming=.4,i._torqueDampen=1,i._minLength=1e-6,i.create=function(e){var 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n=e.options,i=e.canvas;"auto"===t&&(t=p(i)),n.pixelRatio=t,i.setAttribute("data-pixel-ratio",t),i.width=n.width*t,i.height=n.height*t,i.style.width=n.width+"px",i.style.height=n.height+"px"},i.lookAt=function(e,t,n,i){i=void 0===i||i,t=o.isArray(t)?t:[t],n=n||{x:0,y:0};for(var r={min:{x:1/0,y:1/0},max:{x:-1/0,y:-1/0}},a=0;a<t.length;a+=1){var s=t[a],l=s.bounds?s.bounds.min:s.min||s.position||s,u=s.bounds?s.bounds.max:s.max||s.position||s;l&&u&&(l.x<r.min.x&&(r.min.x=l.x),u.x>r.max.x&&(r.max.x=u.x),l.y<r.min.y&&(r.min.y=l.y),u.y>r.max.y&&(r.max.y=u.y))}var 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t=e.bounds.max.x-e.bounds.min.x,n=e.bounds.max.y-e.bounds.min.y,i=t/e.options.width,o=n/e.options.height;e.context.setTransform(e.options.pixelRatio/i,0,0,e.options.pixelRatio/o,0,0),e.context.translate(-e.bounds.min.x,-e.bounds.min.y)},i.endViewTransform=function(e){e.context.setTransform(e.options.pixelRatio,0,0,e.options.pixelRatio,0,0)},i.world=function(e,t){var n,u=o.now(),d=e.engine,p=d.world,f=e.canvas,y=e.context,m=e.options,g=e.timing,x=r.allBodies(p),h=r.allConstraints(p),b=m.wireframes?m.wireframeBackground:m.background,S=[],w=[],A={timestamp:d.timing.timestamp};if(s.trigger(e,"beforeRender",A),e.currentBackground!==b&&v(e,b),y.globalCompositeOperation="source-in",y.fillStyle="transparent",y.fillRect(0,0,f.width,f.height),y.globalCompositeOperation="source-over",m.hasBounds){for(n=0;n<x.length;n++){var P=x[n];a.overlaps(P.bounds,e.bounds)&&S.push(P)}for(n=0;n<h.length;n++){var 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w=h,S=x,1!==e.options.pixelRatio&&e.context.setTransform(e.options.pixelRatio,0,0,e.options.pixelRatio,0,0);!m.wireframes||d.enableSleeping&&m.showSleeping?i.bodies(e,S,y):(m.showConvexHulls&&i.bodyConvexHulls(e,S,y),i.bodyWireframes(e,S,y)),m.showBounds&&i.bodyBounds(e,S,y),(m.showAxes||m.showAngleIndicator)&&i.bodyAxes(e,S,y),m.showPositions&&i.bodyPositions(e,S,y),m.showVelocity&&i.bodyVelocity(e,S,y),m.showIds&&i.bodyIds(e,S,y),m.showSeparations&&i.separations(e,d.pairs.list,y),m.showCollisions&&i.collisions(e,d.pairs.list,y),m.showVertexNumbers&&i.vertexNumbers(e,S,y),m.showMousePosition&&i.mousePosition(e,e.mouse,y),i.constraints(w,y),m.hasBounds&&i.endViewTransform(e),s.trigger(e,"afterRender",A),g.lastElapsed=o.now()-u},i.stats=function(e,t,n){for(var i=e.engine,o=i.world,a=r.allBodies(o),s=0,l=0,c=0;c<a.length;c+=1)s+=a[c].parts.length;var u={Part:s,Body:a.length,Cons:r.allConstraints(o).length,Comp:r.allComposites(o).length,Pair:i.pairs.list.length};for(var d in t.fillStyle="#0e0f19",t.fillRect(l,0,302.5,44),t.font="12px Arial",t.textBaseline="top",t.textAlign="right",u){var p=u[d];t.fillStyle="#aaa",t.fillText(d,l+55,8),t.fillStyle="#eee",t.fillText(p,l+55,26),l+=55}},i.performance=function(e,t){var n=e.engine,o=e.timing,r=o.deltaHistory,a=o.elapsedHistory,s=o.timestampElapsedHistory,l=o.engineDeltaHistory,c=o.engineElapsedHistory,d=n.timing.lastDelta,p=u(r),f=u(a),v=u(l),y=u(c),m=u(s)/p||0,g=1e3/p||0;t.fillStyle="#0e0f19",t.fillRect(0,50,370,34),i.status(t,10,69,60,4,r.length,Math.round(g)+" fps",g/i._goodFps,(function(e){return r[e]/p-1})),i.status(t,82,69,60,4,l.length,d.toFixed(2)+" dt",i._goodDelta/d,(function(e){return l[e]/v-1})),i.status(t,154,69,60,4,c.length,y.toFixed(2)+" ut",1-y/i._goodFps,(function(e){return c[e]/y-1})),i.status(t,226,69,60,4,a.length,f.toFixed(2)+" rt",1-f/i._goodFps,(function(e){return a[e]/f-1})),i.status(t,298,69,60,4,s.length,m.toFixed(2)+" 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i,o,r,a,s,l=n,c=e.options.showInternalEdges;for(l.beginPath(),r=0;r<t.length;r++)if((i=t[r]).render.visible)for(s=i.parts.length>1?1:0;s<i.parts.length;s++){for(o=i.parts[s],l.moveTo(o.vertices[0].x,o.vertices[0].y),a=1;a<o.vertices.length;a++)!o.vertices[a-1].isInternal||c?l.lineTo(o.vertices[a].x,o.vertices[a].y):l.moveTo(o.vertices[a].x,o.vertices[a].y),o.vertices[a].isInternal&&!c&&l.moveTo(o.vertices[(a+1)%o.vertices.length].x,o.vertices[(a+1)%o.vertices.length].y);l.lineTo(o.vertices[0].x,o.vertices[0].y)}l.lineWidth=1,l.strokeStyle="#bbb",l.stroke()},i.bodyConvexHulls=function(e,t,n){var i,o,r,a=n;for(a.beginPath(),o=0;o<t.length;o++)if((i=t[o]).render.visible&&1!==i.parts.length){for(a.moveTo(i.vertices[0].x,i.vertices[0].y),r=1;r<i.vertices.length;r++)a.lineTo(i.vertices[r].x,i.vertices[r].y);a.lineTo(i.vertices[0].x,i.vertices[0].y)}a.lineWidth=1,a.strokeStyle="rgba(255,255,255,0.2)",a.stroke()},i.vertexNumbers=function(e,t,n){var i,o,r,a=n;for(i=0;i<t.length;i++){var s=t[i].parts;for(r=s.length>1?1:0;r<s.length;r++){var l=s[r];for(o=0;o<l.vertices.length;o++)a.fillStyle="rgba(255,255,255,0.2)",a.fillText(i+"_"+o,l.position.x+.8*(l.vertices[o].x-l.position.x),l.position.y+.8*(l.vertices[o].y-l.position.y))}}},i.mousePosition=function(e,t,n){var i=n;i.fillStyle="rgba(255,255,255,0.8)",i.fillText(t.position.x+"  "+t.position.y,t.position.x+5,t.position.y-5)},i.bodyBounds=function(e,t,n){var i=n,o=(e.engine,e.options);i.beginPath();for(var r=0;r<t.length;r++){if(t[r].render.visible)for(var a=t[r].parts,s=a.length>1?1:0;s<a.length;s++){var l=a[s];i.rect(l.bounds.min.x,l.bounds.min.y,l.bounds.max.x-l.bounds.min.x,l.bounds.max.y-l.bounds.min.y)}}o.wireframes?i.strokeStyle="rgba(255,255,255,0.08)":i.strokeStyle="rgba(0,0,0,0.1)",i.lineWidth=1,i.stroke()},i.bodyAxes=function(e,t,n){var i,o,r,a,s=n,l=(e.engine,e.options);for(s.beginPath(),o=0;o<t.length;o++){var c=t[o],u=c.parts;if(c.render.visible)if(l.showAxes)for(r=u.length>1?1:0;r<u.length;r++)for(i=u[r],a=0;a<i.axes.length;a++){var d=i.axes[a];s.moveTo(i.position.x,i.position.y),s.lineTo(i.position.x+20*d.x,i.position.y+20*d.y)}else for(r=u.length>1?1:0;r<u.length;r++)for(i=u[r],a=0;a<i.axes.length;a++)s.moveTo(i.position.x,i.position.y),s.lineTo((i.vertices[0].x+i.vertices[i.vertices.length-1].x)/2,(i.vertices[0].y+i.vertices[i.vertices.length-1].y)/2)}l.wireframes?(s.strokeStyle="indianred",s.lineWidth=1):(s.strokeStyle="rgba(255, 255, 255, 0.4)",s.globalCompositeOperation="overlay",s.lineWidth=2),s.stroke(),s.globalCompositeOperation="source-over"},i.bodyPositions=function(e,t,n){var i,o,r,a,s=n,l=(e.engine,e.options);for(s.beginPath(),r=0;r<t.length;r++)if((i=t[r]).render.visible)for(a=0;a<i.parts.length;a++)o=i.parts[a],s.arc(o.position.x,o.position.y,3,0,2*Math.PI,!1),s.closePath();for(l.wireframes?s.fillStyle="indianred":s.fillStyle="rgba(0,0,0,0.5)",s.fill(),s.beginPath(),r=0;r<t.length;r++)(i=t[r]).render.visible&&(s.arc(i.positionPrev.x,i.positionPrev.y,2,0,2*Math.PI,!1),s.closePath());s.fillStyle="rgba(255,165,0,0.8)",s.fill()},i.bodyVelocity=function(e,t,n){var i=n;i.beginPath();for(var o=0;o<t.length;o++){var r=t[o];r.render.visible&&(i.moveTo(r.position.x,r.position.y),i.lineTo(r.position.x+2*(r.position.x-r.positionPrev.x),r.position.y+2*(r.position.y-r.positionPrev.y)))}i.lineWidth=3,i.strokeStyle="cornflowerblue",i.stroke()},i.bodyIds=function(e,t,n){var i,o,r=n;for(i=0;i<t.length;i++)if(t[i].render.visible){var a=t[i].parts;for(o=a.length>1?1:0;o<a.length;o++){var s=a[o];r.font="12px 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u=i.activeContacts[0].vertex.x,d=i.activeContacts[0].vertex.y;2===i.activeContacts.length&&(u=(i.activeContacts[0].vertex.x+i.activeContacts[1].vertex.x)/2,d=(i.activeContacts[0].vertex.y+i.activeContacts[1].vertex.y)/2),o.bodyB===o.supports[0].body||!0===o.bodyA.isStatic?s.moveTo(u-8*o.normal.x,d-8*o.normal.y):s.moveTo(u+8*o.normal.x,d+8*o.normal.y),s.lineTo(u,d)}l.wireframes?s.strokeStyle="rgba(255,165,0,0.7)":s.strokeStyle="orange",s.lineWidth=1,s.stroke()},i.separations=function(e,t,n){var i,o,r,a,s,l=n,c=e.options;for(l.beginPath(),s=0;s<t.length;s++)if((i=t[s]).isActive){r=(o=i.collision).bodyA;var u=1;(a=o.bodyB).isStatic||r.isStatic||(u=.5),a.isStatic&&(u=0),l.moveTo(a.position.x,a.position.y),l.lineTo(a.position.x-o.penetration.x*u,a.position.y-o.penetration.y*u),u=1,a.isStatic||r.isStatic||(u=.5),r.isStatic&&(u=0),l.moveTo(r.position.x,r.position.y),l.lineTo(r.position.x+o.penetration.x*u,r.position.y+o.penetration.y*u)}c.wireframes?l.strokeStyle="rgba(255,165,0,0.5)":l.strokeStyle="orange",l.stroke()},i.inspector=function(e,t){e.engine;var n,i=e.selected,o=e.render,r=o.options;if(r.hasBounds){var a=o.bounds.max.x-o.bounds.min.x,s=o.bounds.max.y-o.bounds.min.y,l=a/o.options.width,c=s/o.options.height;t.scale(1/l,1/c),t.translate(-o.bounds.min.x,-o.bounds.min.y)}for(var u=0;u<i.length;u++){var d=i[u].data;switch(t.translate(.5,.5),t.lineWidth=1,t.strokeStyle="rgba(255,165,0,0.9)",t.setLineDash([1,2]),d.type){case"body":n=d.bounds,t.beginPath(),t.rect(Math.floor(n.min.x-3),Math.floor(n.min.y-3),Math.floor(n.max.x-n.min.x+6),Math.floor(n.max.y-n.min.y+6)),t.closePath(),t.stroke();break;case"constraint":var p=d.pointA;d.bodyA&&(p=d.pointB),t.beginPath(),t.arc(p.x,p.y,10,0,2*Math.PI),t.closePath(),t.stroke()}t.setLineDash([]),t.translate(-.5,-.5)}null!==e.selectStart&&(t.translate(.5,.5),t.lineWidth=1,t.strokeStyle="rgba(255,165,0,0.6)",t.fillStyle="rgba(255,165,0,0.1)",n=e.selectBounds,t.beginPath(),t.rect(Math.floor(n.min.x),Math.floor(n.min.y),Math.floor(n.max.x-n.min.x),Math.floor(n.max.y-n.min.y)),t.closePath(),t.stroke(),t.fill(),t.translate(-.5,-.5)),r.hasBounds&&t.setTransform(1,0,0,1,0,0)};var n=function(e,t){var n=e.engine,o=e.timing,r=o.historySize,a=n.timing.timestamp;o.delta=t-o.lastTime||i._goodDelta,o.lastTime=t,o.timestampElapsed=a-o.lastTimestamp||0,o.lastTimestamp=a,o.deltaHistory.unshift(o.delta),o.deltaHistory.length=Math.min(o.deltaHistory.length,r),o.engineDeltaHistory.unshift(n.timing.lastDelta),o.engineDeltaHistory.length=Math.min(o.engineDeltaHistory.length,r),o.timestampElapsedHistory.unshift(o.timestampElapsed),o.timestampElapsedHistory.length=Math.min(o.timestampElapsedHistory.length,r),o.engineElapsedHistory.unshift(n.timing.lastElapsed),o.engineElapsedHistory.length=Math.min(o.engineElapsedHistory.length,r),o.elapsedHistory.unshift(o.lastElapsed),o.elapsedHistory.length=Math.min(o.elapsedHistory.length,r)},u=function(e){for(var t=0,n=0;n<e.length;n+=1)t+=e[n];return t/e.length||0},d=function(e,t){var n=document.createElement("canvas");return n.width=e,n.height=t,n.oncontextmenu=function(){return!1},n.onselectstart=function(){return!1},n},p=function(e){var t=e.getContext("2d");return(window.devicePixelRatio||1)/(t.webkitBackingStorePixelRatio||t.mozBackingStorePixelRatio||t.msBackingStorePixelRatio||t.oBackingStorePixelRatio||t.backingStorePixelRatio||1)},f=function(e,t){var n=e.textures[t];return n||((n=e.textures[t]=new Image).src=t,n)},v=function(e,t){var n=t;/(jpg|gif|png)$/.test(t)&&(n="url("+t+")"),e.canvas.style.background=n,e.canvas.style.backgroundSize="contain",e.currentBackground=t}}()},function(e,t){var n={};e.exports=n,n.create=function(e){return{vertex:e,normalImpulse:0,tangentImpulse:0}}},function(e,t,n){var i={};e.exports=i;var o=n(7),r=n(19),a=n(14),s=n(20),l=n(4),c=n(5),u=n(10),d=n(0),p=n(6);i.create=function(e){e=e||{};var t=d.extend({positionIterations:6,velocityIterations:4,constraintIterations:2,enableSleeping:!1,events:[],plugin:{},gravity:{x:0,y:1,scale:.001},timing:{timestamp:0,timeScale:1,lastDelta:0,lastElapsed:0}},e);return t.world=e.world||c.create({label:"World"}),t.pairs=e.pairs||s.create(),t.detector=e.detector||a.create(),t.grid={buckets:[]},t.world.gravity=t.gravity,t.broadphase=t.grid,t.metrics={},t},i.update=function(e,t,n){var p=d.now();t=t||1e3/60,n=n||1;var f,v=e.world,y=e.detector,m=e.pairs,g=e.timing,x=g.timestamp;g.timestamp+=t*g.timeScale,g.lastDelta=t*g.timeScale;var h={timestamp:g.timestamp};l.trigger(e,"beforeUpdate",h);var b=c.allBodies(v),S=c.allConstraints(v);for(v.isModified&&a.setBodies(y,b),v.isModified&&c.setModified(v,!1,!1,!0),e.enableSleeping&&o.update(b,g.timeScale),i._bodiesApplyGravity(b,e.gravity),i._bodiesUpdate(b,t,g.timeScale,n,v.bounds),u.preSolveAll(b),f=0;f<e.constraintIterations;f++)u.solveAll(S,g.timeScale);u.postSolveAll(b),y.pairs=e.pairs;var w=a.collisions(y);for(s.update(m,w,x),e.enableSleeping&&o.afterCollisions(m.list,g.timeScale),m.collisionStart.length>0&&l.trigger(e,"collisionStart",{pairs:m.collisionStart}),r.preSolvePosition(m.list),f=0;f<e.positionIterations;f++)r.solvePosition(m.list,g.timeScale);for(r.postSolvePosition(b),u.preSolveAll(b),f=0;f<e.constraintIterations;f++)u.solveAll(S,g.timeScale);for(u.postSolveAll(b),r.preSolveVelocity(m.list),f=0;f<e.velocityIterations;f++)r.solveVelocity(m.list,g.timeScale);return m.collisionActive.length>0&&l.trigger(e,"collisionActive",{pairs:m.collisionActive}),m.collisionEnd.length>0&&l.trigger(e,"collisionEnd",{pairs:m.collisionEnd}),i._bodiesClearForces(b),l.trigger(e,"afterUpdate",h),e.timing.lastElapsed=d.now()-p,e},i.merge=function(e,t){if(d.extend(e,t),t.world){e.world=t.world,i.clear(e);for(var n=c.allBodies(e.world),r=0;r<n.length;r++){var a=n[r];o.set(a,!1),a.id=d.nextId()}}},i.clear=function(e){s.clear(e.pairs),a.clear(e.detector)},i._bodiesClearForces=function(e){for(var t=0;t<e.length;t++){var n=e[t];n.force.x=0,n.force.y=0,n.torque=0}},i._bodiesApplyGravity=function(e,t){var n=void 0!==t.scale?t.scale:.001;if((0!==t.x||0!==t.y)&&0!==n)for(var i=0;i<e.length;i++){var o=e[i];o.isStatic||o.isSleeping||(o.force.y+=o.mass*t.y*n,o.force.x+=o.mass*t.x*n)}},i._bodiesUpdate=function(e,t,n,i,o){for(var r=0;r<e.length;r++){var a=e[r];a.isStatic||a.isSleeping||p.update(a,t,n,i)}}},function(e,t,n){var i={};e.exports=i;var o=n(3),r=n(1);i._restingThresh=4,i._restingThreshTangent=6,i._positionDampen=.9,i._positionWarming=.8,i._frictionNormalMultiplier=5,i.preSolvePosition=function(e){var t,n,i,o=e.length;for(t=0;t<o;t++)(n=e[t]).isActive&&(i=n.activeContacts.length,n.collision.parentA.totalContacts+=i,n.collision.parentB.totalContacts+=i)},i.solvePosition=function(e,t){var n,o,r,a,s,l,c,u,d=i._positionDampen,p=e.length;for(n=0;n<p;n++)(o=e[n]).isActive&&!o.isSensor&&(a=(r=o.collision).parentA,s=r.parentB,l=r.normal,o.separation=l.x*(s.positionImpulse.x+r.penetration.x-a.positionImpulse.x)+l.y*(s.positionImpulse.y+r.penetration.y-a.positionImpulse.y));for(n=0;n<p;n++)(o=e[n]).isActive&&!o.isSensor&&(a=(r=o.collision).parentA,s=r.parentB,l=r.normal,u=(o.separation-o.slop)*t,(a.isStatic||s.isStatic)&&(u*=2),a.isStatic||a.isSleeping||(c=d/a.totalContacts,a.positionImpulse.x+=l.x*u*c,a.positionImpulse.y+=l.y*u*c),s.isStatic||s.isSleeping||(c=d/s.totalContacts,s.positionImpulse.x-=l.x*u*c,s.positionImpulse.y-=l.y*u*c))},i.postSolvePosition=function(e){for(var t=i._positionWarming,n=e.length,a=o.translate,s=r.update,l=0;l<n;l++){var c=e[l],u=c.positionImpulse,d=u.x,p=u.y,f=c.velocity;if(c.totalContacts=0,0!==d||0!==p){for(var v=0;v<c.parts.length;v++){var y=c.parts[v];a(y.vertices,u),s(y.bounds,y.vertices,f),y.position.x+=d,y.position.y+=p}c.positionPrev.x+=d,c.positionPrev.y+=p,d*f.x+p*f.y<0?(u.x=0,u.y=0):(u.x*=t,u.y*=t)}}},i.preSolveVelocity=function(e){var t,n,i=e.length;for(t=0;t<i;t++){var o=e[t];if(o.isActive&&!o.isSensor){var r=o.activeContacts,a=r.length,s=o.collision,l=s.parentA,c=s.parentB,u=s.normal,d=s.tangent;for(n=0;n<a;n++){var p=r[n],f=p.vertex,v=p.normalImpulse,y=p.tangentImpulse;if(0!==v||0!==y){var m=u.x*v+d.x*y,g=u.y*v+d.y*y;l.isStatic||l.isSleeping||(l.positionPrev.x+=m*l.inverseMass,l.positionPrev.y+=g*l.inverseMass,l.anglePrev+=l.inverseInertia*((f.x-l.position.x)*g-(f.y-l.position.y)*m)),c.isStatic||c.isSleeping||(c.positionPrev.x-=m*c.inverseMass,c.positionPrev.y-=g*c.inverseMass,c.anglePrev-=c.inverseInertia*((f.x-c.position.x)*g-(f.y-c.position.y)*m))}}}}},i.solveVelocity=function(e,t){var n,o,r,a,s=t*t,l=i._restingThresh*s,c=i._frictionNormalMultiplier,u=i._restingThreshTangent*s,d=Number.MAX_VALUE,p=e.length;for(r=0;r<p;r++){var f=e[r];if(f.isActive&&!f.isSensor){var v=f.collision,y=v.parentA,m=v.parentB,g=y.velocity,x=m.velocity,h=v.normal.x,b=v.normal.y,S=v.tangent.x,w=v.tangent.y,A=f.activeContacts,P=A.length,C=1/P,M=y.inverseMass+m.inverseMass,B=f.friction*f.frictionStatic*c*s;for(g.x=y.position.x-y.positionPrev.x,g.y=y.position.y-y.positionPrev.y,x.x=m.position.x-m.positionPrev.x,x.y=m.position.y-m.positionPrev.y,y.angularVelocity=y.angle-y.anglePrev,m.angularVelocity=m.angle-m.anglePrev,a=0;a<P;a++){var k=A[a],_=k.vertex,I=_.x-y.position.x,T=_.y-y.position.y,R=_.x-m.position.x,E=_.y-m.position.y,V=g.x-T*y.angularVelocity,L=g.y+I*y.angularVelocity,O=V-(x.x-E*m.angularVelocity),D=L-(x.y+R*m.angularVelocity),F=h*O+b*D,H=S*O+w*D,j=f.separation+F,q=Math.min(j,1),W=(q=j<0?0:q)*B;H>W||-H>W?(o=H>0?H:-H,(n=f.friction*(H>0?1:-1)*s)<-o?n=-o:n>o&&(n=o)):(n=H,o=d);var G=I*b-T*h,N=R*b-E*h,U=C/(M+y.inverseInertia*G*G+m.inverseInertia*N*N),z=(1+f.restitution)*F*U;if(n*=U,F*F>l&&F<0)k.normalImpulse=0;else{var X=k.normalImpulse;k.normalImpulse+=z,k.normalImpulse=Math.min(k.normalImpulse,0),z=k.normalImpulse-X}if(H*H>u)k.tangentImpulse=0;else{var Q=k.tangentImpulse;k.tangentImpulse+=n,k.tangentImpulse<-o&&(k.tangentImpulse=-o),k.tangentImpulse>o&&(k.tangentImpulse=o),n=k.tangentImpulse-Q}var Y=h*z+S*n,Z=b*z+w*n;y.isStatic||y.isSleeping||(y.positionPrev.x+=Y*y.inverseMass,y.positionPrev.y+=Z*y.inverseMass,y.anglePrev+=(I*Z-T*Y)*y.inverseInertia),m.isStatic||m.isSleeping||(m.positionPrev.x-=Y*m.inverseMass,m.positionPrev.y-=Z*m.inverseMass,m.anglePrev-=(R*Z-E*Y)*m.inverseInertia)}}}}},function(e,t,n){var i={};e.exports=i;var o=n(9),r=n(0);i.create=function(e){return r.extend({table:{},list:[],collisionStart:[],collisionActive:[],collisionEnd:[]},e)},i.update=function(e,t,n){var i,r,a,s,l=e.list,c=l.length,u=e.table,d=t.length,p=e.collisionStart,f=e.collisionEnd,v=e.collisionActive;for(p.length=0,f.length=0,v.length=0,s=0;s<c;s++)l[s].confirmedActive=!1;for(s=0;s<d;s++)(a=(i=t[s]).pair)?(a.isActive?v.push(a):p.push(a),o.update(a,i,n),a.confirmedActive=!0):(u[(a=o.create(i,n)).id]=a,p.push(a),l.push(a));var y=[];for(c=l.length,s=0;s<c;s++)(a=l[s]).confirmedActive||(o.setActive(a,!1,n),f.push(a),a.collision.bodyA.isSleeping||a.collision.bodyB.isSleeping||y.push(s));for(s=0;s<y.length;s++)a=l[r=y[s]-s],l.splice(r,1),delete u[a.id]},i.clear=function(e){return e.table={},e.list.length=0,e.collisionStart.length=0,e.collisionActive.length=0,e.collisionEnd.length=0,e}},function(e,t,n){var i=e.exports=n(22);i.Axes=n(11),i.Bodies=n(12),i.Body=n(6),i.Bounds=n(1),i.Collision=n(8),i.Common=n(0),i.Composite=n(5),i.Composites=n(23),i.Constraint=n(10),i.Contact=n(17),i.Detector=n(14),i.Engine=n(18),i.Events=n(4),i.Grid=n(24),i.Mouse=n(13),i.MouseConstraint=n(25),i.Pair=n(9),i.Pairs=n(20),i.Plugin=n(15),i.Query=n(26),i.Render=n(16),i.Resolver=n(19),i.Runner=n(27),i.SAT=n(28),i.Sleeping=n(7),i.Svg=n(29),i.Vector=n(2),i.Vertices=n(3),i.World=n(30),i.Engine.run=i.Runner.run,i.Common.deprecated(i.Engine,"run","Engine.run ➤ use Matter.Runner.run(engine) instead")},function(e,t,n){var i={};e.exports=i;var o=n(15),r=n(0);i.name="matter-js",i.version="0.18.0",i.uses=[],i.used=[],i.use=function(){o.use(i,Array.prototype.slice.call(arguments))},i.before=function(e,t){return e=e.replace(/^Matter./,""),r.chainPathBefore(i,e,t)},i.after=function(e,t){return e=e.replace(/^Matter./,""),r.chainPathAfter(i,e,t)}},function(e,t,n){var i={};e.exports=i;var o=n(5),r=n(10),a=n(0),s=n(6),l=n(12),c=a.deprecated;i.stack=function(e,t,n,i,r,a,l){for(var c,u=o.create({label:"Stack"}),d=e,p=t,f=0,v=0;v<i;v++){for(var y=0,m=0;m<n;m++){var g=l(d,p,m,v,c,f);if(g){var x=g.bounds.max.y-g.bounds.min.y,h=g.bounds.max.x-g.bounds.min.x;x>y&&(y=x),s.translate(g,{x:.5*h,y:.5*x}),d=g.bounds.max.x+r,o.addBody(u,g),c=g,f+=1}else d+=r}p+=y+a,d=e}return u},i.chain=function(e,t,n,i,s,l){for(var c=e.bodies,u=1;u<c.length;u++){var d=c[u-1],p=c[u],f=d.bounds.max.y-d.bounds.min.y,v=d.bounds.max.x-d.bounds.min.x,y=p.bounds.max.y-p.bounds.min.y,m={bodyA:d,pointA:{x:v*t,y:f*n},bodyB:p,pointB:{x:(p.bounds.max.x-p.bounds.min.x)*i,y:y*s}},g=a.extend(m,l);o.addConstraint(e,r.create(g))}return e.label+=" Chain",e},i.mesh=function(e,t,n,i,s){var l,c,u,d,p,f=e.bodies;for(l=0;l<n;l++){for(c=1;c<t;c++)u=f[c-1+l*t],d=f[c+l*t],o.addConstraint(e,r.create(a.extend({bodyA:u,bodyB:d},s)));if(l>0)for(c=0;c<t;c++)u=f[c+(l-1)*t],d=f[c+l*t],o.addConstraint(e,r.create(a.extend({bodyA:u,bodyB:d},s))),i&&c>0&&(p=f[c-1+(l-1)*t],o.addConstraint(e,r.create(a.extend({bodyA:p,bodyB:d},s)))),i&&c<t-1&&(p=f[c+1+(l-1)*t],o.addConstraint(e,r.create(a.extend({bodyA:p,bodyB:d},s))))}return e.label+=" Mesh",e},i.pyramid=function(e,t,n,o,r,a,l){return i.stack(e,t,n,o,r,a,(function(t,i,a,c,u,d){var p=Math.min(o,Math.ceil(n/2)),f=u?u.bounds.max.x-u.bounds.min.x:0;if(!(c>p||a<(c=p-c)||a>n-1-c))return 1===d&&s.translate(u,{x:(a+(n%2==1?1:-1))*f,y:0}),l(e+(u?a*f:0)+a*r,i,a,c,u,d)}))},i.newtonsCradle=function(e,t,n,i,a){for(var s=o.create({label:"Newtons Cradle"}),c=0;c<n;c++){var u=l.circle(e+c*(1.9*i),t+a,i,{inertia:1/0,restitution:1,friction:0,frictionAir:1e-4,slop:1}),d=r.create({pointA:{x:e+c*(1.9*i),y:t},bodyB:u});o.addBody(s,u),o.addConstraint(s,d)}return s},c(i,"newtonsCradle","Composites.newtonsCradle ➤ moved to newtonsCradle example"),i.car=function(e,t,n,i,a){var c=s.nextGroup(!0),u=.5*-n+20,d=.5*n-20,p=o.create({label:"Car"}),f=l.rectangle(e,t,n,i,{collisionFilter:{group:c},chamfer:{radius:.5*i},density:2e-4}),v=l.circle(e+u,t+0,a,{collisionFilter:{group:c},friction:.8}),y=l.circle(e+d,t+0,a,{collisionFilter:{group:c},friction:.8}),m=r.create({bodyB:f,pointB:{x:u,y:0},bodyA:v,stiffness:1,length:0}),g=r.create({bodyB:f,pointB:{x:d,y:0},bodyA:y,stiffness:1,length:0});return o.addBody(p,f),o.addBody(p,v),o.addBody(p,y),o.addConstraint(p,m),o.addConstraint(p,g),p},c(i,"car","Composites.car ➤ moved to car example"),i.softBody=function(e,t,n,o,r,s,c,u,d,p){d=a.extend({inertia:1/0},d),p=a.extend({stiffness:.2,render:{type:"line",anchors:!1}},p);var f=i.stack(e,t,n,o,r,s,(function(e,t){return l.circle(e,t,u,d)}));return i.mesh(f,n,o,c,p),f.label="Soft Body",f},c(i,"softBody","Composites.softBody ➤ moved to softBody and cloth examples")},function(e,t,n){var i={};e.exports=i;var o=n(9),r=n(0),a=r.deprecated;i.create=function(e){return r.extend({buckets:{},pairs:{},pairsList:[],bucketWidth:48,bucketHeight:48},e)},i.update=function(e,t,n,o){var r,a,s,l,c,u=n.world,d=e.buckets,p=!1;for(r=0;r<t.length;r++){var f=t[r];if((!f.isSleeping||o)&&(!u.bounds||!(f.bounds.max.x<u.bounds.min.x||f.bounds.min.x>u.bounds.max.x||f.bounds.max.y<u.bounds.min.y||f.bounds.min.y>u.bounds.max.y))){var v=i._getRegion(e,f);if(!f.region||v.id!==f.region.id||o){f.region&&!o||(f.region=v);var y=i._regionUnion(v,f.region);for(a=y.startCol;a<=y.endCol;a++)for(s=y.startRow;s<=y.endRow;s++){l=d[c=i._getBucketId(a,s)];var m=a>=v.startCol&&a<=v.endCol&&s>=v.startRow&&s<=v.endRow,g=a>=f.region.startCol&&a<=f.region.endCol&&s>=f.region.startRow&&s<=f.region.endRow;!m&&g&&g&&l&&i._bucketRemoveBody(e,l,f),(f.region===v||m&&!g||o)&&(l||(l=i._createBucket(d,c)),i._bucketAddBody(e,l,f))}f.region=v,p=!0}}}p&&(e.pairsList=i._createActivePairsList(e))},a(i,"update","Grid.update ➤ replaced by Matter.Detector"),i.clear=function(e){e.buckets={},e.pairs={},e.pairsList=[]},a(i,"clear","Grid.clear ➤ replaced by Matter.Detector"),i._regionUnion=function(e,t){var n=Math.min(e.startCol,t.startCol),o=Math.max(e.endCol,t.endCol),r=Math.min(e.startRow,t.startRow),a=Math.max(e.endRow,t.endRow);return i._createRegion(n,o,r,a)},i._getRegion=function(e,t){var n=t.bounds,o=Math.floor(n.min.x/e.bucketWidth),r=Math.floor(n.max.x/e.bucketWidth),a=Math.floor(n.min.y/e.bucketHeight),s=Math.floor(n.max.y/e.bucketHeight);return i._createRegion(o,r,a,s)},i._createRegion=function(e,t,n,i){return{id:e+","+t+","+n+","+i,startCol:e,endCol:t,startRow:n,endRow:i}},i._getBucketId=function(e,t){return"C"+e+"R"+t},i._createBucket=function(e,t){return e[t]=[]},i._bucketAddBody=function(e,t,n){var i,r=e.pairs,a=o.id,s=t.length;for(i=0;i<s;i++){var l=t[i];if(!(n.id===l.id||n.isStatic&&l.isStatic)){var c=a(n,l),u=r[c];u?u[2]+=1:r[c]=[n,l,1]}}t.push(n)},i._bucketRemoveBody=function(e,t,n){var i,a=e.pairs,s=o.id;t.splice(r.indexOf(t,n),1);var l=t.length;for(i=0;i<l;i++){var c=a[s(n,t[i])];c&&(c[2]-=1)}},i._createActivePairsList=function(e){var t,n,i=e.pairs,o=r.keys(i),a=o.length,s=[];for(n=0;n<a;n++)(t=i[o[n]])[2]>0?s.push(t):delete i[o[n]];return s}},function(e,t,n){var i={};e.exports=i;var o=n(3),r=n(7),a=n(13),s=n(4),l=n(14),c=n(10),u=n(5),d=n(0),p=n(1);i.create=function(e,t){var n=(e?e.mouse:null)||(t?t.mouse:null);n||(e&&e.render&&e.render.canvas?n=a.create(e.render.canvas):t&&t.element?n=a.create(t.element):(n=a.create(),d.warn("MouseConstraint.create: options.mouse was undefined, options.element was undefined, may not function as expected")));var o={type:"mouseConstraint",mouse:n,element:null,body:null,constraint:c.create({label:"Mouse Constraint",pointA:n.position,pointB:{x:0,y:0},length:.01,stiffness:.1,angularStiffness:1,render:{strokeStyle:"#90EE90",lineWidth:3}}),collisionFilter:{category:1,mask:4294967295,group:0}},r=d.extend(o,t);return s.on(e,"beforeUpdate",(function(){var t=u.allBodies(e.world);i.update(r,t),i._triggerEvents(r)})),r},i.update=function(e,t){var n=e.mouse,i=e.constraint,a=e.body;if(0===n.button){if(i.bodyB)r.set(i.bodyB,!1),i.pointA=n.position;else for(var c=0;c<t.length;c++)if(a=t[c],p.contains(a.bounds,n.position)&&l.canCollide(a.collisionFilter,e.collisionFilter))for(var u=a.parts.length>1?1:0;u<a.parts.length;u++){var d=a.parts[u];if(o.contains(d.vertices,n.position)){i.pointA=n.position,i.bodyB=e.body=a,i.pointB={x:n.position.x-a.position.x,y:n.position.y-a.position.y},i.angleB=a.angle,r.set(a,!1),s.trigger(e,"startdrag",{mouse:n,body:a});break}}}else i.bodyB=e.body=null,i.pointB=null,a&&s.trigger(e,"enddrag",{mouse:n,body:a})},i._triggerEvents=function(e){var t=e.mouse,n=t.sourceEvents;n.mousemove&&s.trigger(e,"mousemove",{mouse:t}),n.mousedown&&s.trigger(e,"mousedown",{mouse:t}),n.mouseup&&s.trigger(e,"mouseup",{mouse:t}),a.clearSourceEvents(t)}},function(e,t,n){var i={};e.exports=i;var o=n(2),r=n(8),a=n(1),s=n(12),l=n(3);i.collides=function(e,t){for(var n=[],i=t.length,o=e.bounds,s=r.collides,l=a.overlaps,c=0;c<i;c++){var u=t[c],d=u.parts.length,p=1===d?0:1;if(l(u.bounds,o))for(var f=p;f<d;f++){var v=u.parts[f];if(l(v.bounds,o)){var y=s(v,e);if(y){n.push(y);break}}}}return n},i.ray=function(e,t,n,r){r=r||1e-100;for(var 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i=e.parts[n];i.isStatic=t,t?(i._original={restitution:i.restitution,friction:i.friction,mass:i.mass,inertia:i.inertia,density:i.density,inverseMass:i.inverseMass,inverseInertia:i.inverseInertia},i.restitution=0,i.friction=1,i.mass=i.inertia=i.density=1/0,i.inverseMass=i.inverseInertia=0,i.positionPrev.x=i.position.x,i.positionPrev.y=i.position.y,i.anglePrev=i.angle,i.angularVelocity=0,i.speed=0,i.angularSpeed=0,i.motion=0):i._original&&(i.restitution=i._original.restitution,i.friction=i._original.friction,i.mass=i._original.mass,i.inertia=i._original.inertia,i.density=i._original.density,i.inverseMass=i._original.inverseMass,i.inverseInertia=i._original.inverseInertia,i._original=null)}},i.setMass=function(e,t){var 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a=Math.pow(t*n*e.timeScale,2),s=1-e.frictionAir*n*e.timeScale,u=e.position.x-e.positionPrev.x,d=e.position.y-e.positionPrev.y;e.velocity.x=u*s*i+e.force.x/e.mass*a,e.velocity.y=d*s*i+e.force.y/e.mass*a,e.positionPrev.x=e.position.x,e.positionPrev.y=e.position.y,e.position.x+=e.velocity.x,e.position.y+=e.velocity.y,e.angularVelocity=(e.angle-e.anglePrev)*s*i+e.torque/e.inertia*a,e.anglePrev=e.angle,e.angle+=e.angularVelocity,e.speed=r.magnitude(e.velocity),e.angularSpeed=Math.abs(e.angularVelocity);for(var p=0;p<e.parts.length;p++){var f=e.parts[p];o.translate(f.vertices,e.velocity),p>0&&(f.position.x+=e.velocity.x,f.position.y+=e.velocity.y),0!==e.angularVelocity&&(o.rotate(f.vertices,e.angularVelocity,e.position),c.rotate(f.axes,e.angularVelocity),p>0&&r.rotateAbout(f.position,e.angularVelocity,e.position,f.position)),l.update(f.bounds,f.vertices,e.velocity)}},i.applyForce=function(e,t,n){e.force.x+=n.x,e.force.y+=n.y;var i=t.x-e.position.x,o=t.y-e.position.y;e.torque+=i*n.y-o*n.x},i._totalProperties=function(e){for(var t={mass:0,area:0,inertia:0,centre:{x:0,y:0}},n=1===e.parts.length?0:1;n<e.parts.length;n++){var i=e.parts[n],o=i.mass!==1/0?i.mass:1;t.mass+=o,t.area+=i.area,t.inertia+=i.inertia,t.centre=r.add(t.centre,r.mult(i.position,o))}return t.centre=r.div(t.centre,t.mass),t}}()},function(e,t,n){var i={};e.exports=i;var o=n(4);i._motionWakeThreshold=.18,i._motionSleepThreshold=.08,i._minBias=.9,i.update=function(e,t){for(var n=t*t*t,o=0;o<e.length;o++){var r=e[o],a=r.speed*r.speed+r.angularSpeed*r.angularSpeed;if(0===r.force.x&&0===r.force.y){var s=Math.min(r.motion,a),l=Math.max(r.motion,a);r.motion=i._minBias*s+(1-i._minBias)*l,r.sleepThreshold>0&&r.motion<i._motionSleepThreshold*n?(r.sleepCounter+=1,r.sleepCounter>=r.sleepThreshold&&i.set(r,!0)):r.sleepCounter>0&&(r.sleepCounter-=1)}else i.set(r,!1)}},i.afterCollisions=function(e,t){for(var n=t*t*t,o=0;o<e.length;o++){var r=e[o];if(r.isActive){var a=r.collision,s=a.bodyA.parent,l=a.bodyB.parent;if(!(s.isSleeping&&l.isSleeping||s.isStatic||l.isStatic)&&(s.isSleeping||l.isSleeping)){var c=s.isSleeping&&!s.isStatic?s:l,u=c===s?l:s;!c.isStatic&&u.motion>i._motionWakeThreshold*n&&i.set(c,!1)}}}},i.set=function(e,t){var n=e.isSleeping;t?(e.isSleeping=!0,e.sleepCounter=e.sleepThreshold,e.positionImpulse.x=0,e.positionImpulse.y=0,e.positionPrev.x=e.position.x,e.positionPrev.y=e.position.y,e.anglePrev=e.angle,e.speed=0,e.angularSpeed=0,e.motion=0,n||o.trigger(e,"sleepStart")):(e.isSleeping=!1,e.sleepCounter=0,n&&o.trigger(e,"sleepEnd"))}},function(e,t,n){var i={};e.exports=i;var o,r,a,s=n(3),l=n(9);o=[],r={overlap:0,axis:null},a={overlap:0,axis:null},i.create=function(e,t){return{pair:null,collided:!1,bodyA:e,bodyB:t,parentA:e.parent,parentB:t.parent,depth:0,normal:{x:0,y:0},tangent:{x:0,y:0},penetration:{x:0,y:0},supports:[]}},i.collides=function(e,t,n){if(i._overlapAxes(r,e.vertices,t.vertices,e.axes),r.overlap<=0)return null;if(i._overlapAxes(a,t.vertices,e.vertices,t.axes),a.overlap<=0)return null;var o,c,u=n&&n.table[l.id(e,t)];u?o=u.collision:((o=i.create(e,t)).collided=!0,o.bodyA=e.id<t.id?e:t,o.bodyB=e.id<t.id?t:e,o.parentA=o.bodyA.parent,o.parentB=o.bodyB.parent),e=o.bodyA,t=o.bodyB,c=r.overlap<a.overlap?r:a;var d=o.normal,p=o.supports,f=c.axis,v=f.x,y=f.y;v*(t.position.x-e.position.x)+y*(t.position.y-e.position.y)<0?(d.x=v,d.y=y):(d.x=-v,d.y=-y),o.tangent.x=-d.y,o.tangent.y=d.x,o.depth=c.overlap,o.penetration.x=d.x*o.depth,o.penetration.y=d.y*o.depth;var g=i._findSupports(e,t,d,1),m=0;if(s.contains(e.vertices,g[0])&&(p[m++]=g[0]),s.contains(e.vertices,g[1])&&(p[m++]=g[1]),m<2){var x=i._findSupports(t,e,d,-1);s.contains(t.vertices,x[0])&&(p[m++]=x[0]),m<2&&s.contains(t.vertices,x[1])&&(p[m++]=x[1])}return 0===m&&(p[m++]=g[0]),p.length=m,o},i._overlapAxes=function(e,t,n,i){var o,r,a,s,l,c,u=t.length,d=n.length,p=t[0].x,f=t[0].y,v=n[0].x,y=n[0].y,g=i.length,m=Number.MAX_VALUE,x=0;for(l=0;l<g;l++){var h=i[l],b=h.x,S=h.y,w=p*b+f*S,A=v*b+y*S,P=w,M=A;for(c=1;c<u;c+=1)(s=t[c].x*b+t[c].y*S)>P?P=s:s<w&&(w=s);for(c=1;c<d;c+=1)(s=n[c].x*b+n[c].y*S)>M?M=s:s<A&&(A=s);if((o=(r=P-A)<(a=M-w)?r:a)<m&&(m=o,x=l,o<=0))break}e.axis=i[x],e.overlap=m},i._projectToAxis=function(e,t,n){for(var i=t[0].x*n.x+t[0].y*n.y,o=i,r=1;r<t.length;r+=1){var a=t[r].x*n.x+t[r].y*n.y;a>o?o=a:a<i&&(i=a)}e.min=i,e.max=o},i._findSupports=function(e,t,n,i){var r,a,s,l,c,u=t.vertices,d=u.length,p=e.position.x,f=e.position.y,v=n.x*i,y=n.y*i,g=Number.MAX_VALUE;for(c=0;c<d;c+=1)(l=v*(p-(a=u[c]).x)+y*(f-a.y))<g&&(g=l,r=a);return g=v*(p-(s=u[(d+r.index-1)%d]).x)+y*(f-s.y),v*(p-(a=u[(r.index+1)%d]).x)+y*(f-a.y)<g?(o[0]=r,o[1]=a,o):(o[0]=r,o[1]=s,o)}},function(e,t,n){var i={};e.exports=i;var o=n(17);i.create=function(e,t){var n=e.bodyA,o=e.bodyB,r={id:i.id(n,o),bodyA:n,bodyB:o,collision:e,contacts:[],activeContacts:[],separation:0,isActive:!0,confirmedActive:!0,isSensor:n.isSensor||o.isSensor,timeCreated:t,timeUpdated:t,inverseMass:0,friction:0,frictionStatic:0,restitution:0,slop:0};return i.update(r,e,t),r},i.update=function(e,t,n){var i=e.contacts,r=t.supports,a=e.activeContacts,s=t.parentA,l=t.parentB,c=s.vertices.length;e.isActive=!0,e.timeUpdated=n,e.collision=t,e.separation=t.depth,e.inverseMass=s.inverseMass+l.inverseMass,e.friction=s.friction<l.friction?s.friction:l.friction,e.frictionStatic=s.frictionStatic>l.frictionStatic?s.frictionStatic:l.frictionStatic,e.restitution=s.restitution>l.restitution?s.restitution:l.restitution,e.slop=s.slop>l.slop?s.slop:l.slop,t.pair=e,a.length=0;for(var u=0;u<r.length;u++){var d=r[u],p=d.body===s?d.index:c+d.index,f=i[p];f?a.push(f):a.push(i[p]=o.create(d))}},i.setActive=function(e,t,n){t?(e.isActive=!0,e.timeUpdated=n):(e.isActive=!1,e.activeContacts.length=0)},i.id=function(e,t){return e.id<t.id?"A"+e.id+"B"+t.id:"A"+t.id+"B"+e.id}},function(e,t,n){var i={};e.exports=i;var o=n(3),r=n(2),a=n(7),s=n(1),l=n(11),c=n(0);i._warming=.4,i._torqueDampen=1,i._angleLimitDampen=.5,i._minLength=1e-6,i.create=function(e){var t=e;t.bodyA&&!t.pointA&&(t.pointA={x:0,y:0}),t.bodyB&&!t.pointB&&(t.pointB={x:0,y:0});var n=t.bodyA?r.add(t.bodyA.position,t.pointA):t.pointA,i=t.bodyB?r.add(t.bodyB.position,t.pointB):t.pointB,o=r.magnitude(r.sub(n,i)),a=r.angle(n,i);t.length=void 0!==t.length?t.length:o,t.id=t.id||c.nextId(),t.label=t.label||"Constraint",t.type="constraint",t.stiffness=t.stiffness||(t.length>0?1:.7),t.damping=t.damping||0,t.angularStiffness=t.angularStiffness||0,t.angleAPrev=t.bodyA?t.bodyA.angle:t.angleAPrev,t.angleBPrev=t.bodyB?t.bodyB.angle:t.angleBPrev,t.plugin={},t.angleA=void 0!==t.angleA?t.angleA:t.bodyA?0:a,t.angleAStiffness=t.angleAStiffness||0,t.angleAMin=t.angleAMin||0,t.angleAMax=t.angleAMax||0,t.angleB=void 0!==t.angleB?t.angleB:t.bodyB?0:a,t.angleBStiffness=t.angleBStiffness||0,t.angleBMin=t.angleBMin||0,t.angleBMax=t.angleBMax||0;var s={visible:!0,lineWidth:2,strokeStyle:"#ffffff",type:"line",anchors:!0,angles:!0};return 0===t.length&&t.stiffness>.1?(s.type="pin",s.anchors=!1):t.stiffness<.9&&(s.type="spring"),t.render=c.extend(s,t.render),t},i.preSolveAll=function(e){for(var t=0;t<e.length;t+=1){var n=e[t],i=n.constraintImpulse;n.isStatic||0===i.x&&0===i.y&&0===i.angle||(n.position.x+=i.x,n.position.y+=i.y,n.angle+=i.angle)}},i.solveAll=function(e,t){for(var n=0;n<e.length;n+=1){var o=e[n],r=!o.bodyA||o.bodyA&&o.bodyA.isStatic,a=!o.bodyB||o.bodyB&&o.bodyB.isStatic;(r||a)&&i.solve(e[n],t)}for(n=0;n<e.length;n+=1)r=!(o=e[n]).bodyA||o.bodyA&&o.bodyA.isStatic,a=!o.bodyB||o.bodyB&&o.bodyB.isStatic,r||a||i.solve(e[n],t)},i.solve=function(e,t){var n=e.bodyA,o=e.bodyB,a=e.pointA,s=e.pointB;if(n||o){n&&!n.isStatic&&(r.rotate(a,n.angle-e.angleAPrev,a),e.angleAPrev=n.angle),o&&!o.isStatic&&(r.rotate(s,o.angle-e.angleBPrev,s),e.angleBPrev=o.angle);var l=a,c=s;if(n&&(l=r.add(n.position,a)),o&&(c=r.add(o.position,s)),l&&c){var u=r.sub(l,c),d=r.magnitude(u);d<i._minLength&&(d=i._minLength);var p,f,v,y,g,m,x,h=(d-e.length)/d,b=e.stiffness<1?e.stiffness*t:e.stiffness,S=r.mult(u,h*b),w=(n?n.inverseMass:0)+(o?o.inverseMass:0),A=w+((n?n.inverseInertia:0)+(o?o.inverseInertia:0)),P=(e.angleAStiffness<1?e.angleAStiffness*t:e.angleAStiffness)*i._angleLimitDampen,M=(e.angleBStiffness<1?e.angleBStiffness*t:e.angleBStiffness)*i._angleLimitDampen;if(e.angleAStiffness&&(m=i.solveAngleLimits(e,n,e.angleA,e.angleAMin,e.angleAMax,u,-1,d,l,c)),e.angleBStiffness&&(x=i.solveAngleLimits(e,o,e.angleB,e.angleBMin,e.angleBMax,u,1,d,c,l)),e.damping){var B=r.create();v=r.div(u,d),g=r.sub(o&&r.sub(o.position,o.positionPrev)||B,n&&r.sub(n.position,n.positionPrev)||B),y=r.dot(v,g)}n&&!n.isStatic&&(f=n.inverseMass/w,!x||o&&!o.isStatic||(S.x-=x.x*M,S.y-=x.y*M),n.constraintImpulse.x-=S.x*f,n.constraintImpulse.y-=S.y*f,n.position.x-=S.x*f,n.position.y-=S.y*f,e.damping&&(n.positionPrev.x-=e.damping*v.x*y*f,n.positionPrev.y-=e.damping*v.y*y*f),p=r.cross(a,S)/A*i._torqueDampen*n.inverseInertia*(1-e.angularStiffness),m&&(p-=m.angle*P),n.constraintImpulse.angle-=p,n.angle-=p,!x||o&&!o.isStatic||(S.x+=x.x*M,S.y+=x.y*M)),o&&!o.isStatic&&(f=o.inverseMass/w,!m||n&&!n.isStatic||(S.x+=m.x*P,S.y+=m.y*P),o.constraintImpulse.x+=S.x*f,o.constraintImpulse.y+=S.y*f,o.position.x+=S.x*f,o.position.y+=S.y*f,e.damping&&(o.positionPrev.x+=e.damping*v.x*y*f,o.positionPrev.y+=e.damping*v.y*y*f),p=r.cross(s,S)/A*i._torqueDampen*o.inverseInertia*(1-e.angularStiffness),x&&(p+=x.angle*M),o.constraintImpulse.angle+=p,o.angle+=p)}}},i.postSolveAll=function(e){for(var t=0;t<e.length;t++){var n=e[t],c=n.constraintImpulse;if(!(n.isStatic||0===c.x&&0===c.y&&0===c.angle)){a.set(n,!1);for(var u=0;u<n.parts.length;u++){var d=n.parts[u];o.translate(d.vertices,c),u>0&&(d.position.x+=c.x,d.position.y+=c.y),0!==c.angle&&(o.rotate(d.vertices,c.angle,n.position),l.rotate(d.axes,c.angle),u>0&&r.rotateAbout(d.position,c.angle,n.position,d.position)),s.update(d.bounds,d.vertices,n.velocity)}c.angle*=i._warming,c.x*=i._warming,c.y*=i._warming}}},i.pointAWorld=function(e){return{x:(e.bodyA?e.bodyA.position.x:0)+(e.pointA?e.pointA.x:0),y:(e.bodyA?e.bodyA.position.y:0)+(e.pointA?e.pointA.y:0)}},i.pointBWorld=function(e){return{x:(e.bodyB?e.bodyB.position.x:0)+(e.pointB?e.pointB.x:0),y:(e.bodyB?e.bodyB.position.y:0)+(e.pointB?e.pointB.y:0)}},i.solveAngleLimits=function(e,t,n,i,o,a,s,l,u,d){var p,f=(t?t.angle:0)+(e.length>0?n:0),v=i<o?i:o,y=o>i?o:i,g={x:Math.cos(f),y:Math.sin(f)};if((p=0===e.length?c.angleDiff(n,f):Math.atan2(g.x*a.y*s-g.y*a.x*s,g.x*a.x*s+g.y*a.y*s))>v&&p<y)return null;var m=c.clampAngle(p,v,y),x=r.rotate(g,m);return{x:u.x+x.x*l-d.x,y:u.y+x.y*l-d.y,angle:c.angleDiff(p,m)}}},function(e,t,n){var i={};e.exports=i;var o=n(2),r=n(0);i.fromVertices=function(e){for(var t={},n=0;n<e.length;n++){var i=(n+1)%e.length,a=o.normalise({x:e[i].y-e[n].y,y:e[n].x-e[i].x}),s=0===a.y?1/0:a.x/a.y;t[s=s.toFixed(3).toString()]=a}return r.values(t)},i.rotate=function(e,t){if(0!==t)for(var n=Math.cos(t),i=Math.sin(t),o=0;o<e.length;o++){var r,a=e[o];r=a.x*n-a.y*i,a.y=a.x*i+a.y*n,a.x=r}}},function(e,t,n){var i={};e.exports=i;var o=n(3),r=n(0),a=n(6),s=n(1),l=n(2);i.rectangle=function(e,t,n,i,s){s=s||{};var l={label:"Rectangle Body",position:{x:e,y:t},vertices:o.fromPath("L 0 0 L "+n+" 0 L "+n+" "+i+" L 0 "+i)};if(s.chamfer){var c=s.chamfer;l.vertices=o.chamfer(l.vertices,c.radius,c.quality,c.qualityMin,c.qualityMax),delete s.chamfer}return a.create(r.extend({},l,s))},i.trapezoid=function(e,t,n,i,s,l){l=l||{};var c,u=n*(s*=.5),d=u+(1-2*s)*n,p=d+u;c=s<.5?"L 0 0 L "+u+" "+-i+" L "+d+" "+-i+" L "+p+" 0":"L 0 0 L "+d+" "+-i+" L "+p+" 0";var f={label:"Trapezoid Body",position:{x:e,y:t},vertices:o.fromPath(c)};if(l.chamfer){var v=l.chamfer;f.vertices=o.chamfer(f.vertices,v.radius,v.quality,v.qualityMin,v.qualityMax),delete l.chamfer}return a.create(r.extend({},f,l))},i.circle=function(e,t,n,o,a){o=o||{};var s={label:"Circle Body",circleRadius:n};a=a||25;var l=Math.ceil(Math.max(10,Math.min(a,n)));return l%2==1&&(l+=1),i.polygon(e,t,l,n,r.extend({},s,o))},i.polygon=function(e,t,n,s,l){if(l=l||{},n<3)return i.circle(e,t,s,l);for(var c=2*Math.PI/n,u="",d=.5*c,p=0;p<n;p+=1){var f=d+p*c,v=Math.cos(f)*s,y=Math.sin(f)*s;u+="L "+v.toFixed(3)+" "+y.toFixed(3)+" "}var g={label:"Polygon Body",position:{x:e,y:t},vertices:o.fromPath(u)};if(l.chamfer){var m=l.chamfer;g.vertices=o.chamfer(g.vertices,m.radius,m.quality,m.qualityMin,m.qualityMax),delete l.chamfer}return a.create(r.extend({},g,l))},i.fromVertices=function(e,t,n,i,c,u,d,p){var f,v,y,g,m,x,h,b,S,w,A=r.getDecomp();for(f=Boolean(A&&A.quickDecomp),i=i||{},y=[],c=void 0!==c&&c,u=void 0!==u?u:.01,d=void 0!==d?d:10,p=void 0!==p?p:.01,r.isArray(n[0])||(n=[n]),S=0;S<n.length;S+=1)if(m=n[S],!(g=o.isConvex(m))&&!f&&r.warnOnce("Bodies.fromVertices: Install the 'poly-decomp' library and use Common.setDecomp or provide 'decomp' as a global to decompose concave vertices."),g||!f)m=g?o.clockwiseSort(m):o.hull(m),y.push({position:{x:e,y:t},vertices:m});else{var P=m.map((function(e){return[e.x,e.y]}));A.makeCCW(P),!1!==u&&A.removeCollinearPoints(P,u),!1!==p&&A.removeDuplicatePoints&&A.removeDuplicatePoints(P,p);var M=A.quickDecomp(P);for(x=0;x<M.length;x++){var B=M[x].map((function(e){return{x:e[0],y:e[1]}}));d>0&&o.area(B)<d||y.push({position:o.centre(B),vertices:B})}}for(x=0;x<y.length;x++)y[x]=a.create(r.extend(y[x],i));if(c)for(x=0;x<y.length;x++){var C=y[x];for(h=x+1;h<y.length;h++){var k=y[h];if(s.overlaps(C.bounds,k.bounds)){var _=C.vertices,I=k.vertices;for(b=0;b<C.vertices.length;b++)for(w=0;w<k.vertices.length;w++){var T=l.magnitudeSquared(l.sub(_[(b+1)%_.length],I[w])),R=l.magnitudeSquared(l.sub(_[b],I[(w+1)%I.length]));T<5&&R<5&&(_[b].isInternal=!0,I[w].isInternal=!0)}}}}return y.length>1?(v=a.create(r.extend({parts:y.slice(0)},i)),a.setPosition(v,{x:e,y:t}),v):y[0]}},function(e,t,n){var i={};e.exports=i;var o=n(0);i.create=function(e){var t={};return e||o.log("Mouse.create: element was undefined, defaulting to 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n=i._getRelativeMousePosition(e,t.element,t.pixelRatio);e.changedTouches?(t.button=0,e.preventDefault()):t.button=e.button,t.absolute.x=n.x,t.absolute.y=n.y,t.position.x=t.absolute.x*t.scale.x+t.offset.x,t.position.y=t.absolute.y*t.scale.y+t.offset.y,t.mousedownPosition.x=t.position.x,t.mousedownPosition.y=t.position.y,t.sourceEvents.mousedown=e},t.mouseup=function(e){var 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n=e.options,i=e.canvas;"auto"===t&&(t=p(i)),n.pixelRatio=t,i.setAttribute("data-pixel-ratio",t),i.width=n.width*t,i.height=n.height*t,i.style.width=n.width+"px",i.style.height=n.height+"px"},i.lookAt=function(e,t,n,i){i=void 0===i||i,t=o.isArray(t)?t:[t],n=n||{x:0,y:0};for(var r={min:{x:1/0,y:1/0},max:{x:-1/0,y:-1/0}},a=0;a<t.length;a+=1){var s=t[a],l=s.bounds?s.bounds.min:s.min||s.position||s,u=s.bounds?s.bounds.max:s.max||s.position||s;l&&u&&(l.x<r.min.x&&(r.min.x=l.x),u.x>r.max.x&&(r.max.x=u.x),l.y<r.min.y&&(r.min.y=l.y),u.y>r.max.y&&(r.max.y=u.y))}var d=r.max.x-r.min.x+2*n.x,p=r.max.y-r.min.y+2*n.y,f=e.canvas.height,v=e.canvas.width/f,y=d/p,g=1,m=1;y>v?m=y/v:g=v/y,e.options.hasBounds=!0,e.bounds.min.x=r.min.x,e.bounds.max.x=r.min.x+d*g,e.bounds.min.y=r.min.y,e.bounds.max.y=r.min.y+p*m,i&&(e.bounds.min.x+=.5*d-d*g*.5,e.bounds.max.x+=.5*d-d*g*.5,e.bounds.min.y+=.5*p-p*m*.5,e.bounds.max.y+=.5*p-p*m*.5),e.bounds.min.x-=n.x,e.bounds.max.x-=n.x,e.bounds.min.y-=n.y,e.bounds.max.y-=n.y,e.mouse&&(c.setScale(e.mouse,{x:(e.bounds.max.x-e.bounds.min.x)/e.canvas.width,y:(e.bounds.max.y-e.bounds.min.y)/e.canvas.height}),c.setOffset(e.mouse,e.bounds.min))},i.startViewTransform=function(e){var t=e.bounds.max.x-e.bounds.min.x,n=e.bounds.max.y-e.bounds.min.y,i=t/e.options.width,o=n/e.options.height;e.context.setTransform(e.options.pixelRatio/i,0,0,e.options.pixelRatio/o,0,0),e.context.translate(-e.bounds.min.x,-e.bounds.min.y)},i.endViewTransform=function(e){e.context.setTransform(e.options.pixelRatio,0,0,e.options.pixelRatio,0,0)},i.world=function(e,t){var n,u=o.now(),d=e.engine,p=d.world,f=e.canvas,y=e.context,g=e.options,m=e.timing,x=r.allBodies(p),h=r.allConstraints(p),b=g.wireframes?g.wireframeBackground:g.background,S=[],w=[],A={timestamp:d.timing.timestamp};if(s.trigger(e,"beforeRender",A),e.currentBackground!==b&&v(e,b),y.globalCompositeOperation="source-in",y.fillStyle="transparent",y.fillRect(0,0,f.width,f.height),y.globalCompositeOperation="source-over",g.hasBounds){for(n=0;n<x.length;n++){var P=x[n];a.overlaps(P.bounds,e.bounds)&&S.push(P)}for(n=0;n<h.length;n++){var M=h[n],B=M.bodyA,C=M.bodyB,k=M.pointA,_=M.pointB;B&&(k=l.add(B.position,M.pointA)),C&&(_=l.add(C.position,M.pointB)),k&&_&&((a.contains(e.bounds,k)||a.contains(e.bounds,_))&&w.push(M))}i.startViewTransform(e),e.mouse&&(c.setScale(e.mouse,{x:(e.bounds.max.x-e.bounds.min.x)/e.options.width,y:(e.bounds.max.y-e.bounds.min.y)/e.options.height}),c.setOffset(e.mouse,e.bounds.min))}else w=h,S=x,1!==e.options.pixelRatio&&e.context.setTransform(e.options.pixelRatio,0,0,e.options.pixelRatio,0,0);!g.wireframes||d.enableSleeping&&g.showSleeping?i.bodies(e,S,y):(g.showConvexHulls&&i.bodyConvexHulls(e,S,y),i.bodyWireframes(e,S,y)),g.showBounds&&i.bodyBounds(e,S,y),(g.showAxes||g.showAngleIndicator)&&i.bodyAxes(e,S,y),g.showPositions&&i.bodyPositions(e,S,y),g.showVelocity&&i.bodyVelocity(e,S,y),g.showIds&&i.bodyIds(e,S,y),g.showSeparations&&i.separations(e,d.pairs.list,y),g.showCollisions&&i.collisions(e,d.pairs.list,y),g.showVertexNumbers&&i.vertexNumbers(e,S,y),g.showMousePosition&&i.mousePosition(e,e.mouse,y),i.constraints(w,y),g.hasBounds&&i.endViewTransform(e),s.trigger(e,"afterRender",A),m.lastElapsed=o.now()-u},i.stats=function(e,t,n){for(var i=e.engine,o=i.world,a=r.allBodies(o),s=0,l=0,c=0;c<a.length;c+=1)s+=a[c].parts.length;var u={Part:s,Body:a.length,Cons:r.allConstraints(o).length,Comp:r.allComposites(o).length,Pair:i.pairs.list.length};for(var d in t.fillStyle="#0e0f19",t.fillRect(l,0,302.5,44),t.font="12px Arial",t.textBaseline="top",t.textAlign="right",u){var p=u[d];t.fillStyle="#aaa",t.fillText(d,l+55,8),t.fillStyle="#eee",t.fillText(p,l+55,26),l+=55}},i.performance=function(e,t){var n=e.engine,o=e.timing,r=o.deltaHistory,a=o.elapsedHistory,s=o.timestampElapsedHistory,l=o.engineDeltaHistory,c=o.engineElapsedHistory,d=n.timing.lastDelta,p=u(r),f=u(a),v=u(l),y=u(c),g=u(s)/p||0,m=1e3/p||0;t.fillStyle="#0e0f19",t.fillRect(0,50,370,34),i.status(t,10,69,60,4,r.length,Math.round(m)+" fps",m/i._goodFps,(function(e){return r[e]/p-1})),i.status(t,82,69,60,4,l.length,d.toFixed(2)+" dt",i._goodDelta/d,(function(e){return l[e]/v-1})),i.status(t,154,69,60,4,c.length,y.toFixed(2)+" ut",1-y/i._goodFps,(function(e){return c[e]/y-1})),i.status(t,226,69,60,4,a.length,f.toFixed(2)+" rt",1-f/i._goodFps,(function(e){return a[e]/f-1})),i.status(t,298,69,60,4,s.length,g.toFixed(2)+" 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d,p=l.sub(s,a),f=l.perp(l.normalise(p)),v=Math.ceil(o.clamp(r.length/5,12,20)),y=1;y<v;y+=1)d=y%2==0?1:-1,n.lineTo(a.x+p.x*(y/v)+f.x*d*4,a.y+p.y*(y/v)+f.y*d*4);n.lineTo(s.x,s.y)}if(r.render.lineWidth&&(n.lineWidth=r.render.lineWidth,n.strokeStyle=r.render.strokeStyle,n.stroke()),r.render.anchors&&(n.fillStyle=r.render.strokeStyle,n.beginPath(),n.arc(a.x,a.y,3,0,2*Math.PI),n.arc(s.x,s.y,3,0,2*Math.PI),n.closePath(),n.fill()),r.render.angles&&r.angleAStiffness){var g=(r.length>0&&r.bodyA?r.bodyA.angle:0)+r.angleA;n.beginPath(),n.moveTo(a.x,a.y),n.arc(a.x,a.y,12,g+r.angleAMin,g+r.angleAMax+1e-4,r.angleAMin<=r.angleAMax),n.lineTo(a.x,a.y),n.closePath(),n.strokeStyle="rgba(255,255,255,"+(.3+.3*r.angleAStiffness)+")",n.lineWidth=1.2,n.stroke()}if(r.render.angles&&r.angleBStiffness){g=(r.length>0&&r.bodyB?r.bodyB.angle:0)+r.angleB;n.beginPath(),n.moveTo(s.x,s.y),n.arc(s.x,s.y,12,g+r.angleBMin,g+r.angleBMax+1e-4,r.angleBMin<=r.angleBMax),n.lineTo(s.x,s.y),n.closePath(),n.strokeStyle="rgba(255,255,255,"+(.3+.3*r.angleBStiffness)+")",n.lineWidth=1.2,n.stroke()}}}},i.bodies=function(e,t,n){var 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i,o,r,a,s,l=n,c=e.options.showInternalEdges;for(l.beginPath(),r=0;r<t.length;r++)if((i=t[r]).render.visible)for(s=i.parts.length>1?1:0;s<i.parts.length;s++){for(o=i.parts[s],l.moveTo(o.vertices[0].x,o.vertices[0].y),a=1;a<o.vertices.length;a++)!o.vertices[a-1].isInternal||c?l.lineTo(o.vertices[a].x,o.vertices[a].y):l.moveTo(o.vertices[a].x,o.vertices[a].y),o.vertices[a].isInternal&&!c&&l.moveTo(o.vertices[(a+1)%o.vertices.length].x,o.vertices[(a+1)%o.vertices.length].y);l.lineTo(o.vertices[0].x,o.vertices[0].y)}l.lineWidth=1,l.strokeStyle="#bbb",l.stroke()},i.bodyConvexHulls=function(e,t,n){var i,o,r,a=n;for(a.beginPath(),o=0;o<t.length;o++)if((i=t[o]).render.visible&&1!==i.parts.length){for(a.moveTo(i.vertices[0].x,i.vertices[0].y),r=1;r<i.vertices.length;r++)a.lineTo(i.vertices[r].x,i.vertices[r].y);a.lineTo(i.vertices[0].x,i.vertices[0].y)}a.lineWidth=1,a.strokeStyle="rgba(255,255,255,0.2)",a.stroke()},i.vertexNumbers=function(e,t,n){var i,o,r,a=n;for(i=0;i<t.length;i++){var 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i,o,r,a,s=n,l=(e.engine,e.options);for(s.beginPath(),r=0;r<t.length;r++)if((i=t[r]).render.visible)for(a=0;a<i.parts.length;a++)o=i.parts[a],s.arc(o.position.x,o.position.y,3,0,2*Math.PI,!1),s.closePath();for(l.wireframes?s.fillStyle="indianred":s.fillStyle="rgba(0,0,0,0.5)",s.fill(),s.beginPath(),r=0;r<t.length;r++)(i=t[r]).render.visible&&(s.arc(i.positionPrev.x,i.positionPrev.y,2,0,2*Math.PI,!1),s.closePath());s.fillStyle="rgba(255,165,0,0.8)",s.fill()},i.bodyVelocity=function(e,t,n){var i=n;i.beginPath();for(var o=0;o<t.length;o++){var r=t[o];r.render.visible&&(i.moveTo(r.position.x,r.position.y),i.lineTo(r.position.x+2*(r.position.x-r.positionPrev.x),r.position.y+2*(r.position.y-r.positionPrev.y)))}i.lineWidth=3,i.strokeStyle="cornflowerblue",i.stroke()},i.bodyIds=function(e,t,n){var i,o,r=n;for(i=0;i<t.length;i++)if(t[i].render.visible){var a=t[i].parts;for(o=a.length>1?1:0;o<a.length;o++){var s=a[o];r.font="12px 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u=i.activeContacts[0].vertex.x,d=i.activeContacts[0].vertex.y;2===i.activeContacts.length&&(u=(i.activeContacts[0].vertex.x+i.activeContacts[1].vertex.x)/2,d=(i.activeContacts[0].vertex.y+i.activeContacts[1].vertex.y)/2),o.bodyB===o.supports[0].body||!0===o.bodyA.isStatic?s.moveTo(u-8*o.normal.x,d-8*o.normal.y):s.moveTo(u+8*o.normal.x,d+8*o.normal.y),s.lineTo(u,d)}l.wireframes?s.strokeStyle="rgba(255,165,0,0.7)":s.strokeStyle="orange",s.lineWidth=1,s.stroke()},i.separations=function(e,t,n){var i,o,r,a,s,l=n,c=e.options;for(l.beginPath(),s=0;s<t.length;s++)if((i=t[s]).isActive){r=(o=i.collision).bodyA;var u=1;(a=o.bodyB).isStatic||r.isStatic||(u=.5),a.isStatic&&(u=0),l.moveTo(a.position.x,a.position.y),l.lineTo(a.position.x-o.penetration.x*u,a.position.y-o.penetration.y*u),u=1,a.isStatic||r.isStatic||(u=.5),r.isStatic&&(u=0),l.moveTo(r.position.x,r.position.y),l.lineTo(r.position.x+o.penetration.x*u,r.position.y+o.penetration.y*u)}c.wireframes?l.strokeStyle="rgba(255,165,0,0.5)":l.strokeStyle="orange",l.stroke()},i.inspector=function(e,t){e.engine;var n,i=e.selected,o=e.render,r=o.options;if(r.hasBounds){var a=o.bounds.max.x-o.bounds.min.x,s=o.bounds.max.y-o.bounds.min.y,l=a/o.options.width,c=s/o.options.height;t.scale(1/l,1/c),t.translate(-o.bounds.min.x,-o.bounds.min.y)}for(var u=0;u<i.length;u++){var 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n=e.engine,o=e.timing,r=o.historySize,a=n.timing.timestamp;o.delta=t-o.lastTime||i._goodDelta,o.lastTime=t,o.timestampElapsed=a-o.lastTimestamp||0,o.lastTimestamp=a,o.deltaHistory.unshift(o.delta),o.deltaHistory.length=Math.min(o.deltaHistory.length,r),o.engineDeltaHistory.unshift(n.timing.lastDelta),o.engineDeltaHistory.length=Math.min(o.engineDeltaHistory.length,r),o.timestampElapsedHistory.unshift(o.timestampElapsed),o.timestampElapsedHistory.length=Math.min(o.timestampElapsedHistory.length,r),o.engineElapsedHistory.unshift(n.timing.lastElapsed),o.engineElapsedHistory.length=Math.min(o.engineElapsedHistory.length,r),o.elapsedHistory.unshift(o.lastElapsed),o.elapsedHistory.length=Math.min(o.elapsedHistory.length,r)},u=function(e){for(var t=0,n=0;n<e.length;n+=1)t+=e[n];return t/e.length||0},d=function(e,t){var n=document.createElement("canvas");return n.width=e,n.height=t,n.oncontextmenu=function(){return!1},n.onselectstart=function(){return!1},n},p=function(e){var t=e.getContext("2d");return(window.devicePixelRatio||1)/(t.webkitBackingStorePixelRatio||t.mozBackingStorePixelRatio||t.msBackingStorePixelRatio||t.oBackingStorePixelRatio||t.backingStorePixelRatio||1)},f=function(e,t){var n=e.textures[t];return n||((n=e.textures[t]=new Image).src=t,n)},v=function(e,t){var n=t;/(jpg|gif|png)$/.test(t)&&(n="url("+t+")"),e.canvas.style.background=n,e.canvas.style.backgroundSize="contain",e.currentBackground=t}}()},function(e,t){var n={};e.exports=n,n.create=function(e){return{vertex:e,normalImpulse:0,tangentImpulse:0}}},function(e,t,n){var i={};e.exports=i;var o=n(7),r=n(19),a=n(14),s=n(20),l=n(4),c=n(5),u=n(10),d=n(0),p=n(6);i.create=function(e){e=e||{};var t=d.extend({positionIterations:6,velocityIterations:4,constraintIterations:2,enableSleeping:!1,events:[],plugin:{},gravity:{x:0,y:1,scale:.001},timing:{timestamp:0,timeScale:1,lastDelta:0,lastElapsed:0}},e);return t.world=e.world||c.create({label:"World"}),t.pairs=e.pairs||s.create(),t.detector=e.detector||a.create(),t.grid={buckets:[]},t.world.gravity=t.gravity,t.broadphase=t.grid,t.metrics={},t},i.update=function(e,t,n){var p=d.now();t=t||1e3/60,n=n||1;var f,v=e.world,y=e.detector,g=e.pairs,m=e.timing,x=m.timestamp;m.timestamp+=t*m.timeScale,m.lastDelta=t*m.timeScale;var h={timestamp:m.timestamp};l.trigger(e,"beforeUpdate",h);var b=c.allBodies(v),S=c.allConstraints(v);for(v.isModified&&a.setBodies(y,b),v.isModified&&c.setModified(v,!1,!1,!0),e.enableSleeping&&o.update(b,m.timeScale),i._bodiesApplyGravity(b,e.gravity),i._bodiesUpdate(b,t,m.timeScale,n,v.bounds),u.preSolveAll(b),f=0;f<e.constraintIterations;f++)u.solveAll(S,m.timeScale);u.postSolveAll(b),y.pairs=e.pairs;var w=a.collisions(y);for(s.update(g,w,x),e.enableSleeping&&o.afterCollisions(g.list,m.timeScale),g.collisionStart.length>0&&l.trigger(e,"collisionStart",{pairs:g.collisionStart}),r.preSolvePosition(g.list),f=0;f<e.positionIterations;f++)r.solvePosition(g.list,m.timeScale);for(r.postSolvePosition(b),u.preSolveAll(b),f=0;f<e.constraintIterations;f++)u.solveAll(S,m.timeScale);for(u.postSolveAll(b),r.preSolveVelocity(g.list),f=0;f<e.velocityIterations;f++)r.solveVelocity(g.list,m.timeScale);return g.collisionActive.length>0&&l.trigger(e,"collisionActive",{pairs:g.collisionActive}),g.collisionEnd.length>0&&l.trigger(e,"collisionEnd",{pairs:g.collisionEnd}),i._bodiesClearForces(b),l.trigger(e,"afterUpdate",h),e.timing.lastElapsed=d.now()-p,e},i.merge=function(e,t){if(d.extend(e,t),t.world){e.world=t.world,i.clear(e);for(var n=c.allBodies(e.world),r=0;r<n.length;r++){var a=n[r];o.set(a,!1),a.id=d.nextId()}}},i.clear=function(e){s.clear(e.pairs),a.clear(e.detector)},i._bodiesClearForces=function(e){for(var t=0;t<e.length;t++){var n=e[t];n.force.x=0,n.force.y=0,n.torque=0}},i._bodiesApplyGravity=function(e,t){var n=void 0!==t.scale?t.scale:.001;if((0!==t.x||0!==t.y)&&0!==n)for(var i=0;i<e.length;i++){var o=e[i];o.isStatic||o.isSleeping||(o.force.y+=o.mass*t.y*n,o.force.x+=o.mass*t.x*n)}},i._bodiesUpdate=function(e,t,n,i,o){for(var r=0;r<e.length;r++){var a=e[r];a.isStatic||a.isSleeping||p.update(a,t,n,i)}}},function(e,t,n){var i={};e.exports=i;var o=n(3),r=n(1);i._restingThresh=4,i._restingThreshTangent=6,i._positionDampen=.9,i._positionWarming=.8,i._frictionNormalMultiplier=5,i.preSolvePosition=function(e){var t,n,i,o=e.length;for(t=0;t<o;t++)(n=e[t]).isActive&&(i=n.activeContacts.length,n.collision.parentA.totalContacts+=i,n.collision.parentB.totalContacts+=i)},i.solvePosition=function(e,t){var n,o,r,a,s,l,c,u,d=i._positionDampen,p=e.length;for(n=0;n<p;n++)(o=e[n]).isActive&&!o.isSensor&&(a=(r=o.collision).parentA,s=r.parentB,l=r.normal,o.separation=l.x*(s.positionImpulse.x+r.penetration.x-a.positionImpulse.x)+l.y*(s.positionImpulse.y+r.penetration.y-a.positionImpulse.y));for(n=0;n<p;n++)(o=e[n]).isActive&&!o.isSensor&&(a=(r=o.collision).parentA,s=r.parentB,l=r.normal,u=(o.separation-o.slop)*t,(a.isStatic||s.isStatic)&&(u*=2),a.isStatic||a.isSleeping||(c=d/a.totalContacts,a.positionImpulse.x+=l.x*u*c,a.positionImpulse.y+=l.y*u*c),s.isStatic||s.isSleeping||(c=d/s.totalContacts,s.positionImpulse.x-=l.x*u*c,s.positionImpulse.y-=l.y*u*c))},i.postSolvePosition=function(e){for(var t=i._positionWarming,n=e.length,a=o.translate,s=r.update,l=0;l<n;l++){var c=e[l],u=c.positionImpulse,d=u.x,p=u.y,f=c.velocity;if(c.totalContacts=0,0!==d||0!==p){for(var v=0;v<c.parts.length;v++){var y=c.parts[v];a(y.vertices,u),s(y.bounds,y.vertices,f),y.position.x+=d,y.position.y+=p}c.positionPrev.x+=d,c.positionPrev.y+=p,d*f.x+p*f.y<0?(u.x=0,u.y=0):(u.x*=t,u.y*=t)}}},i.preSolveVelocity=function(e){var t,n,i=e.length;for(t=0;t<i;t++){var o=e[t];if(o.isActive&&!o.isSensor){var r=o.activeContacts,a=r.length,s=o.collision,l=s.parentA,c=s.parentB,u=s.normal,d=s.tangent;for(n=0;n<a;n++){var p=r[n],f=p.vertex,v=p.normalImpulse,y=p.tangentImpulse;if(0!==v||0!==y){var g=u.x*v+d.x*y,m=u.y*v+d.y*y;l.isStatic||l.isSleeping||(l.positionPrev.x+=g*l.inverseMass,l.positionPrev.y+=m*l.inverseMass,l.anglePrev+=l.inverseInertia*((f.x-l.position.x)*m-(f.y-l.position.y)*g)),c.isStatic||c.isSleeping||(c.positionPrev.x-=g*c.inverseMass,c.positionPrev.y-=m*c.inverseMass,c.anglePrev-=c.inverseInertia*((f.x-c.position.x)*m-(f.y-c.position.y)*g))}}}}},i.solveVelocity=function(e,t){var n,o,r,a,s=t*t,l=i._restingThresh*s,c=i._frictionNormalMultiplier,u=i._restingThreshTangent*s,d=Number.MAX_VALUE,p=e.length;for(r=0;r<p;r++){var f=e[r];if(f.isActive&&!f.isSensor){var v=f.collision,y=v.parentA,g=v.parentB,m=y.velocity,x=g.velocity,h=v.normal.x,b=v.normal.y,S=v.tangent.x,w=v.tangent.y,A=f.activeContacts,P=A.length,M=1/P,B=y.inverseMass+g.inverseMass,C=f.friction*f.frictionStatic*c*s;for(m.x=y.position.x-y.positionPrev.x,m.y=y.position.y-y.positionPrev.y,x.x=g.position.x-g.positionPrev.x,x.y=g.position.y-g.positionPrev.y,y.angularVelocity=y.angle-y.anglePrev,g.angularVelocity=g.angle-g.anglePrev,a=0;a<P;a++){var k=A[a],_=k.vertex,I=_.x-y.position.x,T=_.y-y.position.y,R=_.x-g.position.x,E=_.y-g.position.y,L=m.x-T*y.angularVelocity,V=m.y+I*y.angularVelocity,D=L-(x.x-E*g.angularVelocity),O=V-(x.y+R*g.angularVelocity),F=h*D+b*O,H=S*D+w*O,j=f.separation+F,q=Math.min(j,1),W=(q=j<0?0:q)*C;H>W||-H>W?(o=H>0?H:-H,(n=f.friction*(H>0?1:-1)*s)<-o?n=-o:n>o&&(n=o)):(n=H,o=d);var G=I*b-T*h,N=R*b-E*h,U=M/(B+y.inverseInertia*G*G+g.inverseInertia*N*N),z=(1+f.restitution)*F*U;if(n*=U,F*F>l&&F<0)k.normalImpulse=0;else{var X=k.normalImpulse;k.normalImpulse+=z,k.normalImpulse=Math.min(k.normalImpulse,0),z=k.normalImpulse-X}if(H*H>u)k.tangentImpulse=0;else{var Q=k.tangentImpulse;k.tangentImpulse+=n,k.tangentImpulse<-o&&(k.tangentImpulse=-o),k.tangentImpulse>o&&(k.tangentImpulse=o),n=k.tangentImpulse-Q}var Y=h*z+S*n,Z=b*z+w*n;y.isStatic||y.isSleeping||(y.positionPrev.x+=Y*y.inverseMass,y.positionPrev.y+=Z*y.inverseMass,y.anglePrev+=(I*Z-T*Y)*y.inverseInertia),g.isStatic||g.isSleeping||(g.positionPrev.x-=Y*g.inverseMass,g.positionPrev.y-=Z*g.inverseMass,g.anglePrev-=(R*Z-E*Y)*g.inverseInertia)}}}}},function(e,t,n){var i={};e.exports=i;var o=n(9),r=n(0);i.create=function(e){return r.extend({table:{},list:[],collisionStart:[],collisionActive:[],collisionEnd:[]},e)},i.update=function(e,t,n){var i,r,a,s,l=e.list,c=l.length,u=e.table,d=t.length,p=e.collisionStart,f=e.collisionEnd,v=e.collisionActive;for(p.length=0,f.length=0,v.length=0,s=0;s<c;s++)l[s].confirmedActive=!1;for(s=0;s<d;s++)(a=(i=t[s]).pair)?(a.isActive?v.push(a):p.push(a),o.update(a,i,n),a.confirmedActive=!0):(u[(a=o.create(i,n)).id]=a,p.push(a),l.push(a));var y=[];for(c=l.length,s=0;s<c;s++)(a=l[s]).confirmedActive||(o.setActive(a,!1,n),f.push(a),a.collision.bodyA.isSleeping||a.collision.bodyB.isSleeping||y.push(s));for(s=0;s<y.length;s++)a=l[r=y[s]-s],l.splice(r,1),delete u[a.id]},i.clear=function(e){return e.table={},e.list.length=0,e.collisionStart.length=0,e.collisionActive.length=0,e.collisionEnd.length=0,e}},function(e,t,n){var i=e.exports=n(22);i.Axes=n(11),i.Bodies=n(12),i.Body=n(6),i.Bounds=n(1),i.Collision=n(8),i.Common=n(0),i.Composite=n(5),i.Composites=n(23),i.Constraint=n(10),i.Contact=n(17),i.Detector=n(14),i.Engine=n(18),i.Events=n(4),i.Grid=n(24),i.Mouse=n(13),i.MouseConstraint=n(25),i.Pair=n(9),i.Pairs=n(20),i.Plugin=n(15),i.Query=n(26),i.Render=n(16),i.Resolver=n(19),i.Runner=n(27),i.SAT=n(28),i.Sleeping=n(7),i.Svg=n(29),i.Vector=n(2),i.Vertices=n(3),i.World=n(30),i.Engine.run=i.Runner.run,i.Common.deprecated(i.Engine,"run","Engine.run ➤ use Matter.Runner.run(engine) instead")},function(e,t,n){var i={};e.exports=i;var o=n(15),r=n(0);i.name="matter-js",i.version="0.18.0",i.uses=[],i.used=[],i.use=function(){o.use(i,Array.prototype.slice.call(arguments))},i.before=function(e,t){return e=e.replace(/^Matter./,""),r.chainPathBefore(i,e,t)},i.after=function(e,t){return e=e.replace(/^Matter./,""),r.chainPathAfter(i,e,t)}},function(e,t,n){var i={};e.exports=i;var o=n(5),r=n(10),a=n(0),s=n(6),l=n(12),c=a.deprecated;i.stack=function(e,t,n,i,r,a,l){for(var c,u=o.create({label:"Stack"}),d=e,p=t,f=0,v=0;v<i;v++){for(var y=0,g=0;g<n;g++){var m=l(d,p,g,v,c,f);if(m){var x=m.bounds.max.y-m.bounds.min.y,h=m.bounds.max.x-m.bounds.min.x;x>y&&(y=x),s.translate(m,{x:.5*h,y:.5*x}),d=m.bounds.max.x+r,o.addBody(u,m),c=m,f+=1}else d+=r}p+=y+a,d=e}return u},i.chain=function(e,t,n,i,s,l){for(var c=e.bodies,u=1;u<c.length;u++){var d=c[u-1],p=c[u],f=d.bounds.max.y-d.bounds.min.y,v=d.bounds.max.x-d.bounds.min.x,y=p.bounds.max.y-p.bounds.min.y,g={bodyA:d,pointA:{x:v*t,y:f*n},bodyB:p,pointB:{x:(p.bounds.max.x-p.bounds.min.x)*i,y:y*s}},m=a.extend(g,l);o.addConstraint(e,r.create(m))}return e.label+=" Chain",e},i.mesh=function(e,t,n,i,s){var l,c,u,d,p,f=e.bodies;for(l=0;l<n;l++){for(c=1;c<t;c++)u=f[c-1+l*t],d=f[c+l*t],o.addConstraint(e,r.create(a.extend({bodyA:u,bodyB:d},s)));if(l>0)for(c=0;c<t;c++)u=f[c+(l-1)*t],d=f[c+l*t],o.addConstraint(e,r.create(a.extend({bodyA:u,bodyB:d},s))),i&&c>0&&(p=f[c-1+(l-1)*t],o.addConstraint(e,r.create(a.extend({bodyA:p,bodyB:d},s)))),i&&c<t-1&&(p=f[c+1+(l-1)*t],o.addConstraint(e,r.create(a.extend({bodyA:p,bodyB:d},s))))}return e.label+=" Mesh",e},i.pyramid=function(e,t,n,o,r,a,l){return i.stack(e,t,n,o,r,a,(function(t,i,a,c,u,d){var p=Math.min(o,Math.ceil(n/2)),f=u?u.bounds.max.x-u.bounds.min.x:0;if(!(c>p||a<(c=p-c)||a>n-1-c))return 1===d&&s.translate(u,{x:(a+(n%2==1?1:-1))*f,y:0}),l(e+(u?a*f:0)+a*r,i,a,c,u,d)}))},i.newtonsCradle=function(e,t,n,i,a){for(var s=o.create({label:"Newtons Cradle"}),c=0;c<n;c++){var u=l.circle(e+c*(1.9*i),t+a,i,{inertia:1/0,restitution:1,friction:0,frictionAir:1e-4,slop:1}),d=r.create({pointA:{x:e+c*(1.9*i),y:t},bodyB:u});o.addBody(s,u),o.addConstraint(s,d)}return s},c(i,"newtonsCradle","Composites.newtonsCradle ➤ moved to newtonsCradle example"),i.car=function(e,t,n,i,a){var c=s.nextGroup(!0),u=.5*-n+20,d=.5*n-20,p=o.create({label:"Car"}),f=l.rectangle(e,t,n,i,{collisionFilter:{group:c},chamfer:{radius:.5*i},density:2e-4}),v=l.circle(e+u,t+0,a,{collisionFilter:{group:c},friction:.8}),y=l.circle(e+d,t+0,a,{collisionFilter:{group:c},friction:.8}),g=r.create({bodyB:f,pointB:{x:u,y:0},bodyA:v,stiffness:1,length:0}),m=r.create({bodyB:f,pointB:{x:d,y:0},bodyA:y,stiffness:1,length:0});return o.addBody(p,f),o.addBody(p,v),o.addBody(p,y),o.addConstraint(p,g),o.addConstraint(p,m),p},c(i,"car","Composites.car ➤ moved to car example"),i.softBody=function(e,t,n,o,r,s,c,u,d,p){d=a.extend({inertia:1/0},d),p=a.extend({stiffness:.2,render:{type:"line",anchors:!1}},p);var f=i.stack(e,t,n,o,r,s,(function(e,t){return l.circle(e,t,u,d)}));return i.mesh(f,n,o,c,p),f.label="Soft Body",f},c(i,"softBody","Composites.softBody ➤ moved to softBody and cloth examples")},function(e,t,n){var i={};e.exports=i;var o=n(9),r=n(0),a=r.deprecated;i.create=function(e){return r.extend({buckets:{},pairs:{},pairsList:[],bucketWidth:48,bucketHeight:48},e)},i.update=function(e,t,n,o){var r,a,s,l,c,u=n.world,d=e.buckets,p=!1;for(r=0;r<t.length;r++){var f=t[r];if((!f.isSleeping||o)&&(!u.bounds||!(f.bounds.max.x<u.bounds.min.x||f.bounds.min.x>u.bounds.max.x||f.bounds.max.y<u.bounds.min.y||f.bounds.min.y>u.bounds.max.y))){var v=i._getRegion(e,f);if(!f.region||v.id!==f.region.id||o){f.region&&!o||(f.region=v);var y=i._regionUnion(v,f.region);for(a=y.startCol;a<=y.endCol;a++)for(s=y.startRow;s<=y.endRow;s++){l=d[c=i._getBucketId(a,s)];var g=a>=v.startCol&&a<=v.endCol&&s>=v.startRow&&s<=v.endRow,m=a>=f.region.startCol&&a<=f.region.endCol&&s>=f.region.startRow&&s<=f.region.endRow;!g&&m&&m&&l&&i._bucketRemoveBody(e,l,f),(f.region===v||g&&!m||o)&&(l||(l=i._createBucket(d,c)),i._bucketAddBody(e,l,f))}f.region=v,p=!0}}}p&&(e.pairsList=i._createActivePairsList(e))},a(i,"update","Grid.update ➤ replaced by Matter.Detector"),i.clear=function(e){e.buckets={},e.pairs={},e.pairsList=[]},a(i,"clear","Grid.clear ➤ replaced by Matter.Detector"),i._regionUnion=function(e,t){var n=Math.min(e.startCol,t.startCol),o=Math.max(e.endCol,t.endCol),r=Math.min(e.startRow,t.startRow),a=Math.max(e.endRow,t.endRow);return i._createRegion(n,o,r,a)},i._getRegion=function(e,t){var n=t.bounds,o=Math.floor(n.min.x/e.bucketWidth),r=Math.floor(n.max.x/e.bucketWidth),a=Math.floor(n.min.y/e.bucketHeight),s=Math.floor(n.max.y/e.bucketHeight);return i._createRegion(o,r,a,s)},i._createRegion=function(e,t,n,i){return{id:e+","+t+","+n+","+i,startCol:e,endCol:t,startRow:n,endRow:i}},i._getBucketId=function(e,t){return"C"+e+"R"+t},i._createBucket=function(e,t){return e[t]=[]},i._bucketAddBody=function(e,t,n){var i,r=e.pairs,a=o.id,s=t.length;for(i=0;i<s;i++){var l=t[i];if(!(n.id===l.id||n.isStatic&&l.isStatic)){var c=a(n,l),u=r[c];u?u[2]+=1:r[c]=[n,l,1]}}t.push(n)},i._bucketRemoveBody=function(e,t,n){var i,a=e.pairs,s=o.id;t.splice(r.indexOf(t,n),1);var l=t.length;for(i=0;i<l;i++){var c=a[s(n,t[i])];c&&(c[2]-=1)}},i._createActivePairsList=function(e){var t,n,i=e.pairs,o=r.keys(i),a=o.length,s=[];for(n=0;n<a;n++)(t=i[o[n]])[2]>0?s.push(t):delete i[o[n]];return s}},function(e,t,n){var i={};e.exports=i;var o=n(3),r=n(7),a=n(13),s=n(4),l=n(14),c=n(10),u=n(5),d=n(0),p=n(1);i.create=function(e,t){var n=(e?e.mouse:null)||(t?t.mouse:null);n||(e&&e.render&&e.render.canvas?n=a.create(e.render.canvas):t&&t.element?n=a.create(t.element):(n=a.create(),d.warn("MouseConstraint.create: options.mouse was undefined, options.element was undefined, may not function as expected")));var o={type:"mouseConstraint",mouse:n,element:null,body:null,constraint:c.create({label:"Mouse Constraint",pointA:n.position,pointB:{x:0,y:0},length:.01,stiffness:.1,angularStiffness:1,render:{strokeStyle:"#90EE90",lineWidth:3}}),collisionFilter:{category:1,mask:4294967295,group:0}},r=d.extend(o,t);return s.on(e,"beforeUpdate",(function(){var t=u.allBodies(e.world);i.update(r,t),i._triggerEvents(r)})),r},i.update=function(e,t){var n=e.mouse,i=e.constraint,a=e.body;if(0===n.button){if(i.bodyB)r.set(i.bodyB,!1),i.pointA=n.position;else for(var c=0;c<t.length;c++)if(a=t[c],p.contains(a.bounds,n.position)&&l.canCollide(a.collisionFilter,e.collisionFilter))for(var u=a.parts.length>1?1:0;u<a.parts.length;u++){var d=a.parts[u];if(o.contains(d.vertices,n.position)){i.pointA=n.position,i.bodyB=e.body=a,i.pointB={x:n.position.x-a.position.x,y:n.position.y-a.position.y},i.angleBPrev=a.angle,r.set(a,!1),s.trigger(e,"startdrag",{mouse:n,body:a});break}}}else i.bodyB=e.body=null,i.pointB=null,a&&s.trigger(e,"enddrag",{mouse:n,body:a})},i._triggerEvents=function(e){var t=e.mouse,n=t.sourceEvents;n.mousemove&&s.trigger(e,"mousemove",{mouse:t}),n.mousedown&&s.trigger(e,"mousedown",{mouse:t}),n.mouseup&&s.trigger(e,"mouseup",{mouse:t}),a.clearSourceEvents(t)}},function(e,t,n){var i={};e.exports=i;var o=n(2),r=n(8),a=n(1),s=n(12),l=n(3);i.collides=function(e,t){for(var n=[],i=t.length,o=e.bounds,s=r.collides,l=a.overlaps,c=0;c<i;c++){var u=t[c],d=u.parts.length,p=1===d?0:1;if(l(u.bounds,o))for(var f=p;f<d;f++){var v=u.parts[f];if(l(v.bounds,o)){var y=s(v,e);if(y){n.push(y);break}}}}return n},i.ray=function(e,t,n,r){r=r||1e-100;for(var a=o.angle(t,n),l=o.magnitude(o.sub(t,n)),c=.5*(n.x+t.x),u=.5*(n.y+t.y),d=s.rectangle(c,u,l,r,{angle:a}),p=i.collides(d,e),f=0;f<p.length;f+=1){var v=p[f];v.body=v.bodyB=v.bodyA}return p},i.region=function(e,t,n){for(var i=[],o=0;o<e.length;o++){var r=e[o],s=a.overlaps(r.bounds,t);(s&&!n||!s&&n)&&i.push(r)}return i},i.point=function(e,t){for(var n=[],i=0;i<e.length;i++){var o=e[i];if(a.contains(o.bounds,t))for(var r=1===o.parts.length?0:1;r<o.parts.length;r++){var s=o.parts[r];if(a.contains(s.bounds,t)&&l.contains(s.vertices,t)){n.push(o);break}}}return n}},function(e,t,n){var i={};e.exports=i;var o=n(4),r=n(18),a=n(0);!function(){var e,t,n;("undefined"!=typeof window&&(e=window.requestAnimationFrame||window.webkitRequestAnimationFrame||window.mozRequestAnimationFrame||window.msRequestAnimationFrame,t=window.cancelAnimationFrame||window.mozCancelAnimationFrame||window.webkitCancelAnimationFrame||window.msCancelAnimationFrame),e)||(e=function(e){n=setTimeout((function(){e(a.now())}),1e3/60)},t=function(){clearTimeout(n)});i.create=function(e){var t=a.extend({fps:60,correction:1,deltaSampleSize:60,counterTimestamp:0,frameCounter:0,deltaHistory:[],timePrev:null,timeScalePrev:1,frameRequestId:null,isFixed:!1,enabled:!0},e);return t.delta=t.delta||1e3/t.fps,t.deltaMin=t.deltaMin||1e3/t.fps,t.deltaMax=t.deltaMax||1e3/(.5*t.fps),t.fps=1e3/t.delta,t},i.run=function(t,n){return void 0!==t.positionIterations&&(n=t,t=i.create()),function o(r){t.frameRequestId=e(o),r&&t.enabled&&i.tick(t,n,r)}(),t},i.tick=function(e,t,n){var i,a=t.timing,s=1,l={timestamp:a.timestamp};o.trigger(e,"beforeTick",l),e.isFixed?i=e.delta:(i=n-e.timePrev||e.delta,e.timePrev=n,e.deltaHistory.push(i),e.deltaHistory=e.deltaHistory.slice(-e.deltaSampleSize),s=(i=(i=(i=Math.min.apply(null,e.deltaHistory))<e.deltaMin?e.deltaMin:i)>e.deltaMax?e.deltaMax:i)/e.delta,e.delta=i),0!==e.timeScalePrev&&(s*=a.timeScale/e.timeScalePrev),0===a.timeScale&&(s=0),e.timeScalePrev=a.timeScale,e.correction=s,e.frameCounter+=1,n-e.counterTimestamp>=1e3&&(e.fps=e.frameCounter*((n-e.counterTimestamp)/1e3),e.counterTimestamp=n,e.frameCounter=0),o.trigger(e,"tick",l),o.trigger(e,"beforeUpdate",l),r.update(t,i,s),o.trigger(e,"afterUpdate",l),o.trigger(e,"afterTick",l)},i.stop=function(e){t(e.frameRequestId)},i.start=function(e,t){i.run(e,t)}}()},function(e,t,n){var i={};e.exports=i;var o=n(8),r=n(0).deprecated;i.collides=function(e,t){return o.collides(e,t)},r(i,"collides","SAT.collides ➤ replaced by Collision.collides")},function(e,t,n){var i={};e.exports=i;n(1);var o=n(0);i.pathToVertices=function(e,t){"undefined"==typeof window||"SVGPathSeg"in window||o.warn("Svg.pathToVertices: SVGPathSeg not defined, a polyfill is required.");var n,r,a,s,l,c,u,d,p,f,v,y=[],g=0,m=0,x=0;t=t||15;var h=function(e,t,n){var i=n%2==1&&n>1;if(!p||e!=p.x||t!=p.y){p&&i?(f=p.x,v=p.y):(f=0,v=0);var o={x:f+e,y:v+t};!i&&p||(p=o),y.push(o),m=f+e,x=v+t}},b=function(e){var t=e.pathSegTypeAsLetter.toUpperCase();if("Z"!==t){switch(t){case"M":case"L":case"T":case"C":case"S":case"Q":m=e.x,x=e.y;break;case"H":m=e.x;break;case"V":x=e.y}h(m,x,e.pathSegType)}};for(i._svgPathToAbsolute(e),a=e.getTotalLength(),c=[],n=0;n<e.pathSegList.numberOfItems;n+=1)c.push(e.pathSegList.getItem(n));for(u=c.concat();g<a;){if((l=c[e.getPathSegAtLength(g)])!=d){for(;u.length&&u[0]!=l;)b(u.shift());d=l}switch(l.pathSegTypeAsLetter.toUpperCase()){case"C":case"T":case"S":case"Q":case"A":s=e.getPointAtLength(g),h(s.x,s.y,0)}g+=t}for(n=0,r=u.length;n<r;++n)b(u[n]);return y},i._svgPathToAbsolute=function(e){for(var t,n,i,o,r,a,s=e.pathSegList,l=0,c=0,u=s.numberOfItems,d=0;d<u;++d){var p=s.getItem(d),f=p.pathSegTypeAsLetter;if(/[MLHVCSQTA]/.test(f))"x"in p&&(l=p.x),"y"in p&&(c=p.y);else switch("x1"in p&&(i=l+p.x1),"x2"in p&&(r=l+p.x2),"y1"in p&&(o=c+p.y1),"y2"in p&&(a=c+p.y2),"x"in p&&(l+=p.x),"y"in p&&(c+=p.y),f){case"m":s.replaceItem(e.createSVGPathSegMovetoAbs(l,c),d);break;case"l":s.replaceItem(e.createSVGPathSegLinetoAbs(l,c),d);break;case"h":s.replaceItem(e.createSVGPathSegLinetoHorizontalAbs(l),d);break;case"v":s.replaceItem(e.createSVGPathSegLinetoVerticalAbs(c),d);break;case"c":s.replaceItem(e.createSVGPathSegCurvetoCubicAbs(l,c,i,o,r,a),d);break;case"s":s.replaceItem(e.createSVGPathSegCurvetoCubicSmoothAbs(l,c,r,a),d);break;case"q":s.replaceItem(e.createSVGPathSegCurvetoQuadraticAbs(l,c,i,o),d);break;case"t":s.replaceItem(e.createSVGPathSegCurvetoQuadraticSmoothAbs(l,c),d);break;case"a":s.replaceItem(e.createSVGPathSegArcAbs(l,c,p.r1,p.r2,p.angle,p.largeArcFlag,p.sweepFlag),d);break;case"z":case"Z":l=t,c=n}"M"!=f&&"m"!=f||(t=l,n=c)}}},function(e,t,n){var i={};e.exports=i;var o=n(5);n(0);i.create=o.create,i.add=o.add,i.remove=o.remove,i.clear=o.clear,i.addComposite=o.addComposite,i.addBody=o.addBody,i.addConstraint=o.addConstraint}])}));
\ No newline at end of file
diff --git a/demo/index.html b/demo/index.html
index a4278e0..69a031a 100644
--- a/demo/index.html
+++ b/demo/index.html
@@ -1,20 +1,14 @@
 <!DOCTYPE html>
 <html lang="en">
   <head>
-    <meta charset="utf-8" />
-    <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" />
-    <meta
-      name="viewport"
-      content="width=device-width,initial-scale=1.0,minimum-scale=1.0,maximum-scale=1.0,user-scalable=no,minimal-ui"
-    />
-    <meta name="theme-color" content="#000000" />
-    <meta name="msapplication-navbutton-color" content="#000000" />
-    <meta name="apple-mobile-web-app-capable" content="yes" />
-    <meta
-      name="apple-mobile-web-app-status-bar-style"
-      content="black-translucent"
-    />
-    <meta name="robots" content="noindex" />
+    <meta charset="utf-8">
+    <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
+    <meta name="viewport" content="width=device-width,initial-scale=1.0,minimum-scale=1.0,maximum-scale=1.0,user-scalable=no,minimal-ui">
+    <meta name="theme-color" content="#000000">
+    <meta name="msapplication-navbutton-color" content="#000000">
+    <meta name="apple-mobile-web-app-capable" content="yes">
+    <meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
+    <meta name="robots" content="noindex">
     <title>Matter.js Demo</title>
 
     <style type="text/css">