API Docs for: 0.3.0
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File: src/shapes/Capsule.js

var Shape = require('./Shape')
,   vec2 = require('../math/vec2')

module.exports = Capsule;

/**
 * Capsule shape class.
 * @class Capsule
 * @constructor
 * @extends {Shape}
 * @param {Number} length The distance between the end points
 * @param {Number} radius Radius of the capsule
 */
function Capsule(length,radius){
    this.length = length || 1;
    this.radius = radius || 1;

    Shape.call(this,Shape.CAPSULE);
};
Capsule.prototype = new Shape();

/**
 * Compute the mass moment of inertia of the Capsule.
 * @method conputeMomentOfInertia
 * @param  {Number} mass
 * @return {Number}
 * @todo
 */
Capsule.prototype.computeMomentOfInertia = function(mass){
    // Approximate with rectangle
    var r = this.radius,
        w = this.length + r, // 2*r is too much, 0 is too little
        h = r*2;
    return mass * (h*h + w*w) / 12;
};

Capsule.prototype.updateBoundingRadius = function(){
    this.boundingRadius = this.radius + this.length/2;
};