matter-attractors-f
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Unofficial updated version of matter-attractors (https://www.npmjs.com/package/matter-attractors)
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JavaScript
/*!
* matter-attractors 0.1.6 by Liam Brummitt 2017-05-15
* https://github.com/liabru/matter-attractors
* License MIT
*/
(function webpackUniversalModuleDefinition(root, factory) {
if(typeof exports === 'object' && typeof module === 'object')
module.exports = factory(require("matter-js"));
else if(typeof define === 'function' && define.amd)
define(["matter-js"], factory);
else if(typeof exports === 'object')
exports["MatterAttractors"] = factory(require("matter-js"));
else
root["MatterAttractors"] = factory(root["Matter"]);
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/* 0 */
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/***/ }),
/* 1 */
/***/ (function(module, exports, __webpack_require__) {
"use strict";
var Matter = __webpack_require__(0);
/**
* An attractors plugin for matter.js.
* See the readme for usage and examples.
* @module MatterAttractors
*/
var MatterAttractors = {
// plugin meta
name: 'matter-attractors', // PLUGIN_NAME
version: '0.1.4', // PLUGIN_VERSION
for: 'matter-js@^0.12.0',
// installs the plugin where `base` is `Matter`
// you should not need to call this directly.
install: function install(base) {
base.after('Body.create', function () {
MatterAttractors.Body.init(this);
});
base.before('Engine.update', function (engine) {
MatterAttractors.Engine.update(engine);
});
},
Body: {
/**
* Initialises the `body` to support attractors.
* This is called automatically by the plugin.
* @function MatterAttractors.Body.init
* @param {Matter.Body} body The body to init.
* @returns {void} No return value.
*/
init: function init(body) {
body.plugin.attractors = body.plugin.attractors || [];
}
},
Engine: {
/**
* Applies all attractors for all bodies in the `engine`.
* This is called automatically by the plugin.
* @function MatterAttractors.Engine.update
* @param {Matter.Engine} engine The engine to update.
* @returns {void} No return value.
*/
update: function update(engine) {
var world = engine.world,
bodies = Matter.Composite.allBodies(world);
for (var i = 0; i < bodies.length; i += 1) {
var bodyA = bodies[i],
attractors = bodyA.plugin.attractors;
if (attractors && attractors.length > 0) {
for (var j = i + 1; j < bodies.length; j += 1) {
var bodyB = bodies[j];
for (var k = 0; k < attractors.length; k += 1) {
var attractor = attractors[k],
forceVector = attractor;
if (Matter.Common.isFunction(attractor)) {
forceVector = attractor(bodyA, bodyB);
}
if (forceVector) {
Matter.Body.applyForce(bodyB, bodyB.position, forceVector);
}
}
}
}
}
}
},
/**
* Defines some useful common attractor functions that can be used
* by pushing them to your body's `body.plugin.attractors` array.
* @namespace MatterAttractors.Attractors
* @property {number} gravityConstant The gravitational constant used by the gravity attractor.
*/
Attractors: {
gravityConstant: 0.001,
/**
* An attractor function that applies Newton's law of gravitation.
* Use this by pushing `MatterAttractors.Attractors.gravity` to your body's `body.plugin.attractors` array.
* The gravitational constant defaults to `0.001` which you can change
* at `MatterAttractors.Attractors.gravityConstant`.
* @function MatterAttractors.Attractors.gravity
* @param {Matter.Body} bodyA The first body.
* @param {Matter.Body} bodyB The second body.
* @returns {void} No return value.
*/
gravity: function gravity(bodyA, bodyB) {
// use Newton's law of gravitation
var bToA = Matter.Vector.sub(bodyB.position, bodyA.position),
distanceSq = Matter.Vector.magnitudeSquared(bToA) || 0.0001,
normal = Matter.Vector.normalise(bToA),
magnitude = -MatterAttractors.Attractors.gravityConstant * (bodyA.mass * bodyB.mass / distanceSq),
force = Matter.Vector.mult(normal, magnitude);
// to apply forces to both bodies
Matter.Body.applyForce(bodyA, bodyA.position, Matter.Vector.neg(force));
Matter.Body.applyForce(bodyB, bodyB.position, force);
}
}
};
Matter.Plugin.register(MatterAttractors);
module.exports = MatterAttractors;
/**
* @namespace Matter.Body
* @see http://brm.io/matter-js/docs/classes/Body.html
*/
/**
* This plugin adds a new property `body.plugin.attractors` to instances of `Matter.Body`.
* This is an array of callback functions that will be called automatically
* for every pair of bodies, on every engine update.
* @property {Function[]} body.plugin.attractors
* @memberof Matter.Body
*/
/**
* An attractor function calculates the force to be applied
* to `bodyB`, it should either:
* - return the force vector to be applied to `bodyB`
* - or apply the force to the body(s) itself
* @callback AttractorFunction
* @param {Matter.Body} bodyA
* @param {Matter.Body} bodyB
* @returns {Vector|undefined} a force vector (optional)
*/
/***/ })
/******/ ]);
});