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add a capsule shape create funtion in Bodies.js

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reason: in my project , i can't solve my all the collision problem by using the chamfer option , so I need capsule.
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anseyuyin 2019-05-23 02:59:04 +08:00
parent 2ec247b7af
commit eedc1249d4
1 changed files with 61 additions and 0 deletions
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61
src/factory/Bodies.js
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@ -332,4 +332,65 @@ var decomp;
}
};
/**
* Creates a new rigid body model with a capsule hull.
* The options parameter is an object that specifies any properties you wish to override the defaults.
* See the properties section of the `Matter.Body` module for detailed information on what you can pass via the `options` object.
* @method capsule
* @param {number} x
* @param {number} y
* @param {number} radius
* @param {number} height
* @param {object} [options]
* @param {number} rotation vertices roate of angle
* @param {number} [maxSides]
* @return {body} A new capsule body
*/
Bodies.capsule = function(x, y, radius , height , options , rotation, maxSides) {
options = options || {};
maxSides = maxSides || 25;
var sides = Math.ceil(Math.max(6, Math.min(maxSides, radius)));
// optimisation: always use even number of sides (half the number of unique axes)
sides = sides % 2 === 1 ? sides++ : sides;
var halfSides= sides/2,
halfDiff = (height - radius)/2,
theta = 2 * Math.PI / sides,
path = '',
angOffset = Math.PI + theta * 0.5,
angle,
xx ,
yy ,
yOffset ;
// Always greater than 0 of halfDiff
halfDiff = halfDiff < 0 ? 0 : halfDiff;
for (var i = 0; i < sides ; i++) {
yOffset = i > halfSides ? halfDiff : -halfDiff;
angle = angOffset + (i * theta);
xx = Math.cos(angle) * radius;
yy = Math.sin(angle) * radius + yOffset;
if(i == 0){
path +='L ' + xx.toFixed(3) + ' ' + (yy - yOffset *2).toFixed(3) + ' ';
}
path += 'L ' + xx.toFixed(3) + ' ' + yy.toFixed(3) + ' ';
if(i == halfSides){
path +='L ' + xx.toFixed(3) + ' ' + (yy - yOffset *2).toFixed(3) + ' ';
}
}
var createCapsule = {
label: 'createCapsule Body',
position: { x: x, y: y },
vertices: Vertices.fromPath(path)
};
if(rotation !=null || rotation % (Math.PI * 2) == 0){
Vertices.rotate(createCapsule.vertices , rotation, {x:x,y:y});
}
return Body.create(Common.extend({}, createCapsule, options));
};
})();