From 0f0ac9392189b09cd8b86ad41d123036ffbb001f Mon Sep 17 00:00:00 2001
From: liabru <liabru@brm.io>
Date: Sun, 13 Aug 2023 12:56:50 +0100
Subject: [PATCH] added Example.stress4

---
 examples/index.js   |   1 +
 examples/stress4.js | 121 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 122 insertions(+)
 create mode 100644 examples/stress4.js

diff --git a/examples/index.js b/examples/index.js
index 940f47b..6e1a615 100644
--- a/examples/index.js
+++ b/examples/index.js
@@ -40,6 +40,7 @@ module.exports = {
     stress: require('./stress.js'),
     stress2: require('./stress2.js'),
     stress3: require('./stress3.js'),
+    stress4: require('./stress4.js'),
     svg: require('./svg.js'),
     terrain: require('./terrain.js'),
     timescale: require('./timescale.js'),
diff --git a/examples/stress4.js b/examples/stress4.js
new file mode 100644
index 0000000..bcbf251
--- /dev/null
+++ b/examples/stress4.js
@@ -0,0 +1,121 @@
+var Example = Example || {};
+
+Example.stress4 = function() {
+    var Engine = Matter.Engine,
+        Events = Matter.Events,
+        Render = Matter.Render,
+        Runner = Matter.Runner,
+        Composites = Matter.Composites,
+        Common = Matter.Common,
+        MouseConstraint = Matter.MouseConstraint,
+        Mouse = Matter.Mouse,
+        Composite = Matter.Composite,
+        Bodies = Matter.Bodies;
+
+    // create engine
+    var engine = Engine.create({
+        positionIterations: 25,
+        velocityIterations: 35
+    });
+
+    var world = engine.world;
+
+    // create renderer
+    var render = Render.create({
+        element: document.body,
+        engine: engine,
+        options: {
+            width: 800,
+            height: 600,
+            showStats: true,
+            showPerformance: true
+        }
+    });
+
+    Render.run(render);
+
+    // create runner
+    var runner = Runner.create({
+        isFixed: true
+    });
+
+    Runner.run(runner, engine);
+
+    // add bodies
+    var stack = function(scale, columns, rows) {
+        return Composites.stack(40, 40, columns, rows, 0, 0, function(x, y) {
+            var sides = Math.round(Common.random(1, 8));
+
+            switch (Math.round(Common.random(0, 1))) {
+            case 0:
+                if (Common.random() < 0.8) {
+                    return Bodies.rectangle(x, y, Common.random(25, 50) * scale, Common.random(25, 50) * scale);
+                } else {
+                    return Bodies.rectangle(x, y, Common.random(80, 120) * scale, Common.random(25, 30) * scale);
+                }
+            case 1:
+                return Bodies.polygon(x, y, sides, Common.random(25, 50) * scale);
+            }
+        });
+    };
+
+    Composite.add(world, [
+        stack(0.2, 61, 15), 
+        stack(0.3, 31, 12),
+        Bodies.rectangle(400, 0, 800, 50, { isStatic: true, render: { visible: false } }),
+        Bodies.rectangle(400, 600, 800, 50, { isStatic: true, render: { visible: false } }),
+        Bodies.rectangle(800, 300, 50, 600, { isStatic: true, render: { visible: false } }),
+        Bodies.rectangle(0, 300, 50, 600, { isStatic: true, render: { visible: false } })
+    ]);
+
+    // scene animation
+    engine.timing.timeScale = 0.9;
+    engine.gravity.scale = 0.0007;
+
+    Events.on(engine, 'beforeUpdate', function() {
+        engine.gravity.x = Math.cos(engine.timing.timestamp * 0.0005);
+        engine.gravity.y = Math.sin(engine.timing.timestamp * 0.0005);
+    });
+
+    // add mouse control
+    var mouse = Mouse.create(render.canvas),
+        mouseConstraint = MouseConstraint.create(engine, {
+            mouse: mouse,
+            constraint: {
+                stiffness: 0.2,
+                render: {
+                    visible: false
+                }
+            }
+        });
+
+    Composite.add(world, mouseConstraint);
+
+    // keep the mouse in sync with rendering
+    render.mouse = mouse;
+
+    // fit the render viewport to the scene
+    Render.lookAt(render, {
+        min: { x: 0, y: 0 },
+        max: { x: 800, y: 600 }
+    });
+
+    // context for MatterTools.Demo
+    return {
+        engine: engine,
+        runner: runner,
+        render: render,
+        canvas: render.canvas,
+        stop: function() {
+            Matter.Render.stop(render);
+            Matter.Runner.stop(runner);
+        }
+    };
+};
+
+Example.stress4.title = 'Stress 4';
+Example.stress4.for = '>=0.14.2';
+
+if (typeof module !== 'undefined') {
+    module.exports = Example.stress4;
+}