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bundle.js
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/******/ (function(modules) { // webpackBootstrap
/******/ // The module cache
/******/ var installedModules = {};
/******/ // The require function
/******/ function __webpack_require__(moduleId) {
/******/ // Check if module is in cache
/******/ if(installedModules[moduleId])
/******/ return installedModules[moduleId].exports;
/******/ // Create a new module (and put it into the cache)
/******/ var module = installedModules[moduleId] = {
/******/ exports: {},
/******/ id: moduleId,
/******/ loaded: false
/******/ };
/******/ // Execute the module function
/******/ modules[moduleId].call(module.exports, module, module.exports, __webpack_require__);
/******/ // Flag the module as loaded
/******/ module.loaded = true;
/******/ // Return the exports of the module
/******/ return module.exports;
/******/ }
/******/ // expose the modules object (__webpack_modules__)
/******/ __webpack_require__.m = modules;
/******/ // expose the module cache
/******/ __webpack_require__.c = installedModules;
/******/ // __webpack_public_path__
/******/ __webpack_require__.p = "";
/******/ // Load entry module and return exports
/******/ return __webpack_require__(0);
/******/ })
/************************************************************************/
/******/ ([
/* 0 */
/***/ (function(module, exports, __webpack_require__) {
'use strict';
var _matterJs = __webpack_require__(1);
var _matterJs2 = _interopRequireDefault(_matterJs);
var _matterWrap = __webpack_require__(2);
var _matterWrap2 = _interopRequireDefault(_matterWrap);
var _zdColours = __webpack_require__(3);
var _relationshapes = __webpack_require__(4);
var _wrapConfig = __webpack_require__(6);
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
function _toConsumableArray(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } else { return Array.from(arr); } } // Patched in node_modules! Do not upgrade!
_matterJs2.default.use(_matterWrap2.default);
// module aliases
var Engine = _matterJs2.default.Engine;
var Render = _matterJs2.default.Render;
var World = _matterJs2.default.World;
var Events = _matterJs2.default.Events;
var Bodies = _matterJs2.default.Bodies;
var Bounds = _matterJs2.default.Bounds;
var Composite = _matterJs2.default.Composite;
var Runner = _matterJs2.default.Runner;
var Body = _matterJs2.default.Body;
var Vector = _matterJs2.default.Vector;
var Vertices = _matterJs2.default.Vertices;
var tick = void 0; // game tick counter
var runner = void 0; // game runner
var bullets = []; // array of live bullets
var isRunning = void 0;
var score = 0;
var godMode = false; // do you die?
var gmbuf = [];
var keys = []; // array of pressed keys
var resultMessage = document.getElementById('message');
var results = document.getElementById('results');
var canvas = document.getElementById('canvas');
// create an engine
var engine = Engine.create();
engine.world.gravity.y = 0;
// create a renderer
var render = Render.create({
element: canvas,
engine: engine,
options: {
width: 600,
height: 600,
wireframes: false,
background: _zdColours.ZD_COLOUR_LIGHT
}
});
var playerShape = Vertices.create([{ x: 0, y: 15 }, { x: -10, y: -15 }, { x: 10, y: -15 }], Body);
var createPlayer = function createPlayer() {
var player = Bodies.fromVertices(render.options.width / 2, render.options.height / 2, playerShape, 20, { // triangle
render: {
strokeStyle: 'transparent'
},
angularFriction: 0.98,
friction: 0
});
player.render.fillStyle = _zdColours.ZD_COLOUR_DARK;
player.plugin = _wrapConfig.plugin;
player.isPlayer = true;
return player;
};
var player = createPlayer();
var generateBlock = function generateBlock() {
var x = 0;
var y = 0;
var distanceFromCenter = function distanceFromCenter() {
return Math.sqrt(Math.pow(x - render.options.width / 2, 2) + Math.pow(y - render.options.height / 2, 2));
};
while (x < 30 || x > render.options.width - 30) {
x = render.options.width * Math.random();
}
while (y < 30 || y > render.options.height - 30) {
y = render.options.width * Math.random();
}
var color = (0, _relationshapes.getRandomColor)();
if (distanceFromCenter() < 100) {
return generateBlock(); // recurse until block isn't too close to center
}
var block = (0, _relationshapes.getRandomShape)(x, y, color);
Body.setAngularVelocity(block, (Math.random() - 0.5) * 0.1);
Body.setVelocity(block, Vector.create((Math.random() - 0.5) * 2, (Math.random() - 0.5) * 2));
return block;
};
var generateAsteroids = function generateAsteroids() {
var numAsteroids = 12;
var asteroids = [];
for (var i = 0; i < numAsteroids; i++) {
asteroids.push(generateBlock());
}
return asteroids;
};
var fireBullet = function fireBullet() {
var bullet = Bodies.circle(player.vertices[2].x, player.vertices[2].y, 3, { // circle
render: {
fillStyle: _zdColours.ZD_COLOUR_DARK,
strokeStyle: 'transparent'
},
plugin: _wrapConfig.plugin,
friction: 0,
frictionStatic: 0,
frictionAir: 0
});
bullet.isBullet = true;
World.add(engine.world, [bullet]);
var angle = player.angle + Math.PI * 0.5;
var speed = 9;
Body.setVelocity(bullet, Vector.create(player.velocity.x + speed * Math.cos(angle), player.velocity.y + speed * Math.sin(angle)));
bullets.push(bullet);
};
// listen for keys
document.onkeydown = function (key) {
if (!isRunning) {
return;
}
if (key.code === 'Space') {
fireBullet();
}
if (keys.indexOf(key.code) == -1) {
keys.push(key.code);
}
gmbuf.push(key.code);
if (gmbuf.length > 5) {
gmbuf.shift();
}
if (gmbuf.join(' ') == ['KeyI KeyD KeyD KeyQ KeyD']) {
godMode = !godMode; // toggle godmode!
alert('God mode ' + (godMode ? 'ENGAGED!' : 'disengaged.'));
}
};
document.onkeyup = function (key) {
if (isRunning) {
if (key.code === 'KeyA' || key.code === 'KeyD') {
Body.setAngularVelocity(player, 0);
}
var i = keys.indexOf(key.code);
if (i != -1) {
keys.splice(i, 1);
}
} else {
if (key.code === 'Space') {
// new game!
hideEndGameScreen();
initGame();
}
}
};
// game loop
// Do we need this??
Events.on(engine, 'beforeTick', function () {
tick = tick + 1;
// artificially limit key events
if (tick % 5 == 0) {
// handle movement keys
keys.forEach(function (code) {
switch (code) {
case 'KeyA':
// left arrow
// apply leftwards spin
Body.setAngularVelocity(player, -0.15);
break;
case 'KeyD':
// right arrow
// apply rightwards spin
Body.setAngularVelocity(player, 0.15);
break;
case 'KeyW':
// up arrow
// increase accel
player.force.x += 0.001 * Math.cos(player.angle + Math.PI * 0.5);
player.force.y += 0.001 * Math.sin(player.angle + Math.PI * 0.5);
break;
case 'KeyS':
// down arrow
// decrease accel
player.force.x -= 0.001 * Math.cos(player.angle + Math.PI * 0.5);
player.force.y -= 0.001 * Math.sin(player.angle + Math.PI * 0.5);
break;
}
});
}
// are there any asteroids left?
if (Composite.allBodies(engine.world).length == bullets.length + 1) {
// if it's just you and your bullets
renderEndGameScreen(true);
isRunning = false;
}
// iterate over asteroids
Composite.allBodies(engine.world).forEach(function (body) {
if (!body.isBullet && !body.isPlayer) {
// did it hit the player?
if (Bounds.overlaps(player.bounds, body.bounds) && !godMode) {
renderEndGameScreen(false);
isRunning = false;
}
// did it hit a bullet?
bullets.forEach(function (bullet) {
if (Bounds.overlaps(body.bounds, bullet.bounds)) {
World.remove(engine.world, body); // TODO: split into children
World.remove(engine.world, bullet);
bullets.splice(bullets.indexOf(bullet), 1);
score += 1;
if (body.successors) {
body.successors.forEach(function (successor) {
World.add(engine.world, successor);
Body.setPosition(successor, body.position);
Body.setAngle(successor, Math.random() - 0.5);
Body.setVelocity(successor, Vector.rotate(body.velocity, Math.random() - 0.5));
});
}
}
});
}
});
if (tick === 500) {
tick = 0;
}; // make sure tick never gets too big
});
var renderEndGameScreen = function renderEndGameScreen(victory) {
if (victory) {
resultMessage.innerHTML = 'Congratulations! You defeated all the relationshapes. Now drift forever in the void.';
} else {
resultMessage.innerHTML = 'You scored ' + score + ' ' + (score == 1 ? 'point' : 'points') + ' before losing.';
}
results.className = 'results';
runner.enabled = false;
};
var hideEndGameScreen = function hideEndGameScreen() {
results.className = 'hidden';
runner.enabled = true;
};
var initGame = function initGame() {
tick = 0;
score = 0;
keys = [];
World.clear(engine.world); // clear world (if the game is restarting)
player = createPlayer();
// add all of the bodies to the world
World.add(engine.world, [player].concat(_toConsumableArray(generateAsteroids())));
isRunning = true;
};
// run the engine and renderer
runner = Engine.run(engine);
Render.run(render);
initGame();
/***/ }),
/* 1 */
/***/ (function(module, exports, __webpack_require__) {
var require;var require;/* WEBPACK VAR INJECTION */(function(global) {/**
* matter-js 0.12.0 by @liabru 2017-02-02
* http://brm.io/matter-js/
* License MIT
*/
/**
* The MIT License (MIT)
*
* Copyright (c) 2014 Liam Brummitt
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
(function(f){if(true){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.Matter = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return require(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(_dereq_,module,exports){
/**
* The `Matter.Body` module contains methods for creating and manipulating body models.
* A `Matter.Body` is a rigid body that can be simulated by a `Matter.Engine`.
* Factories for commonly used body configurations (such as rectangles, circles and other polygons) can be found in the module `Matter.Bodies`.
*
* See the included usage [examples](https://github.com/liabru/matter-js/tree/master/examples).
* @class Body
*/
var Body = {};
module.exports = Body;
var Vertices = _dereq_('../geometry/Vertices');
var Vector = _dereq_('../geometry/Vector');
var Sleeping = _dereq_('../core/Sleeping');
var Render = _dereq_('../render/Render');
var Common = _dereq_('../core/Common');
var Bounds = _dereq_('../geometry/Bounds');
var Axes = _dereq_('../geometry/Axes');
(function() {
Body._inertiaScale = 4;
Body._nextCollidingGroupId = 1;
Body._nextNonCollidingGroupId = -1;
Body._nextCategory = 0x0001;
/**
* Creates a new rigid body model. The options parameter is an object that specifies any properties you wish to override the defaults.
* All properties have default values, and many are pre-calculated automatically based on other properties.
* Vertices must be specified in clockwise order.
* See the properties section below for detailed information on what you can pass via the `options` object.
* @method create
* @param {} options
* @return {body} body
*/
Body.create = function(options) {
var defaults = {
id: Common.nextId(),
type: 'body',
label: 'Body',
parts: [],
plugin: {},
angle: 0,
vertices: Vertices.fromPath('L 0 0 L 40 0 L 40 40 L 0 40'),
position: { x: 0, y: 0 },
force: { x: 0, y: 0 },
torque: 0,
positionImpulse: { x: 0, y: 0 },
constraintImpulse: { x: 0, y: 0, angle: 0 },
totalContacts: 0,
speed: 0,
angularSpeed: 0,
velocity: { x: 0, y: 0 },
angularVelocity: 0,
isSensor: false,
isStatic: false,
isSleeping: false,
motion: 0,
sleepThreshold: 60,
density: 0.001,
restitution: 0,
friction: 0.1,
frictionStatic: 0.5,
frictionAir: 0.01,
collisionFilter: {
category: 0x0001,
mask: 0xFFFFFFFF,
group: 0
},
slop: 0.05,
timeScale: 1,
render: {
visible: true,
opacity: 1,
sprite: {
xScale: 1,
yScale: 1,
xOffset: 0,
yOffset: 0
},
lineWidth: 0
}
};
var body = Common.extend(defaults, options);
_initProperties(body, options);
return body;
};
/**
* Returns the next unique group index for which bodies will collide.
* If `isNonColliding` is `true`, returns the next unique group index for which bodies will _not_ collide.
* See `body.collisionFilter` for more information.
* @method nextGroup
* @param {bool} [isNonColliding=false]
* @return {Number} Unique group index
*/
Body.nextGroup = function(isNonColliding) {
if (isNonColliding)
return Body._nextNonCollidingGroupId--;
return Body._nextCollidingGroupId++;
};
/**
* Returns the next unique category bitfield (starting after the initial default category `0x0001`).
* There are 32 available. See `body.collisionFilter` for more information.
* @method nextCategory
* @return {Number} Unique category bitfield
*/
Body.nextCategory = function() {
Body._nextCategory = Body._nextCategory << 1;
return Body._nextCategory;
};
/**
* Initialises body properties.
* @method _initProperties
* @private
* @param {body} body
* @param {} [options]
*/
var _initProperties = function(body, options) {
options = options || {};
// init required properties (order is important)
Body.set(body, {
bounds: body.bounds || Bounds.create(body.vertices),
positionPrev: body.positionPrev || Vector.clone(body.position),
anglePrev: body.anglePrev || body.angle,
vertices: body.vertices,
parts: body.parts || [body],
isStatic: body.isStatic,
isSleeping: body.isSleeping,
parent: body.parent || body
});
Vertices.rotate(body.vertices, body.angle, body.position);
Axes.rotate(body.axes, body.angle);
Bounds.update(body.bounds, body.vertices, body.velocity);
// allow options to override the automatically calculated properties
Body.set(body, {
axes: options.axes || body.axes,
area: options.area || body.area,
mass: options.mass || body.mass,
inertia: options.inertia || body.inertia
});
// render properties
var defaultFillStyle = (body.isStatic ? '#2e2b44' : Common.choose(['#006BA6', '#0496FF', '#FFBC42', '#D81159', '#8F2D56'])),
defaultStrokeStyle = Common.shadeColor(defaultFillStyle, -20);
body.render.fillStyle = body.render.fillStyle || defaultFillStyle;
body.render.strokeStyle = body.render.strokeStyle || defaultStrokeStyle;
body.render.sprite.xOffset += -(body.bounds.min.x - body.position.x) / (body.bounds.max.x - body.bounds.min.x);
body.render.sprite.yOffset += -(body.bounds.min.y - body.position.y) / (body.bounds.max.y - body.bounds.min.y);
};
/**
* Given a property and a value (or map of), sets the property(s) on the body, using the appropriate setter functions if they exist.
* Prefer to use the actual setter functions in performance critical situations.
* @method set
* @param {body} body
* @param {} settings A property name (or map of properties and values) to set on the body.
* @param {} value The value to set if `settings` is a single property name.
*/
Body.set = function(body, settings, value) {
var property;
if (typeof settings === 'string') {
property = settings;
settings = {};
settings[property] = value;
}
for (property in settings) {
value = settings[property];
if (!settings.hasOwnProperty(property))
continue;
switch (property) {
case 'isStatic':
Body.setStatic(body, value);
break;
case 'isSleeping':
Sleeping.set(body, value);
break;
case 'mass':
Body.setMass(body, value);
break;
case 'density':
Body.setDensity(body, value);
break;
case 'inertia':
Body.setInertia(body, value);
break;
case 'vertices':
Body.setVertices(body, value);
break;
case 'position':
Body.setPosition(body, value);
break;
case 'angle':
Body.setAngle(body, value);
break;
case 'velocity':
Body.setVelocity(body, value);
break;
case 'angularVelocity':
Body.setAngularVelocity(body, value);
break;
case 'parts':
Body.setParts(body, value);
break;
default:
body[property] = value;
}
}
};
/**
* Sets the body as static, including isStatic flag and setting mass and inertia to Infinity.
* @method setStatic
* @param {body} body
* @param {bool} isStatic
*/
Body.setStatic = function(body, isStatic) {
for (var i = 0; i < body.parts.length; i++) {
var part = body.parts[i];
part.isStatic = isStatic;
if (isStatic) {
part._original = {
restitution: part.restitution,
friction: part.friction,
mass: part.mass,
inertia: part.inertia,
density: part.density,
inverseMass: part.inverseMass,
inverseInertia: part.inverseInertia
};
part.restitution = 0;
part.friction = 1;
part.mass = part.inertia = part.density = Infinity;
part.inverseMass = part.inverseInertia = 0;
part.positionPrev.x = part.position.x;
part.positionPrev.y = part.position.y;
part.anglePrev = part.angle;
part.angularVelocity = 0;
part.speed = 0;
part.angularSpeed = 0;
part.motion = 0;
} else if (part._original) {
part.restitution = part._original.restitution;
part.friction = part._original.friction;
part.mass = part._original.mass;
part.inertia = part._original.inertia;
part.density = part._original.density;
part.inverseMass = part._original.inverseMass;
part.inverseInertia = part._original.inverseInertia;
delete part._original;
}
}
};
/**
* Sets the mass of the body. Inverse mass and density are automatically updated to reflect the change.
* @method setMass
* @param {body} body
* @param {number} mass
*/
Body.setMass = function(body, mass) {
body.mass = mass;
body.inverseMass = 1 / body.mass;
body.density = body.mass / body.area;
};
/**
* Sets the density of the body. Mass is automatically updated to reflect the change.
* @method setDensity
* @param {body} body
* @param {number} density
*/
Body.setDensity = function(body, density) {
Body.setMass(body, density * body.area);
body.density = density;
};
/**
* Sets the moment of inertia (i.e. second moment of area) of the body of the body.
* Inverse inertia is automatically updated to reflect the change. Mass is not changed.
* @method setInertia
* @param {body} body
* @param {number} inertia
*/
Body.setInertia = function(body, inertia) {
body.inertia = inertia;
body.inverseInertia = 1 / body.inertia;
};
/**
* Sets the body's vertices and updates body properties accordingly, including inertia, area and mass (with respect to `body.density`).
* Vertices will be automatically transformed to be orientated around their centre of mass as the origin.
* They are then automatically translated to world space based on `body.position`.
*
* The `vertices` argument should be passed as an array of `Matter.Vector` points (or a `Matter.Vertices` array).
* Vertices must form a convex hull, concave hulls are not supported.
*
* @method setVertices
* @param {body} body
* @param {vector[]} vertices
*/
Body.setVertices = function(body, vertices) {
// change vertices
if (vertices[0].body === body) {
body.vertices = vertices;
} else {
body.vertices = Vertices.create(vertices, body);
}
// update properties
body.axes = Axes.fromVertices(body.vertices);
body.area = Vertices.area(body.vertices);
Body.setMass(body, body.density * body.area);
// orient vertices around the centre of mass at origin (0, 0)
var centre = Vertices.centre(body.vertices);
Vertices.translate(body.vertices, centre, -1);
// update inertia while vertices are at origin (0, 0)
Body.setInertia(body, Body._inertiaScale * Vertices.inertia(body.vertices, body.mass));
// update geometry
Vertices.translate(body.vertices, body.position);
Bounds.update(body.bounds, body.vertices, body.velocity);
};
/**
* Sets the parts of the `body` and updates mass, inertia and centroid.
* Each part will have its parent set to `body`.
* By default the convex hull will be automatically computed and set on `body`, unless `autoHull` is set to `false.`
* Note that this method will ensure that the first part in `body.parts` will always be the `body`.
* @method setParts
* @param {body} body
* @param [body] parts
* @param {bool} [autoHull=true]
*/
Body.setParts = function(body, parts, autoHull) {
var i;
// add all the parts, ensuring that the first part is always the parent body
parts = parts.slice(0);
body.parts.length = 0;
body.parts.push(body);
body.parent = body;
for (i = 0; i < parts.length; i++) {
var part = parts[i];
if (part !== body) {
part.parent = body;
body.parts.push(part);
}
}
if (body.parts.length === 1)
return;
autoHull = typeof autoHull !== 'undefined' ? autoHull : true;
// find the convex hull of all parts to set on the parent body
if (autoHull) {
var vertices = [];
for (i = 0; i < parts.length; i++) {
vertices = vertices.concat(parts[i].vertices);
}
Vertices.clockwiseSort(vertices);
var hull = Vertices.hull(vertices),
hullCentre = Vertices.centre(hull);
Body.setVertices(body, hull);
Vertices.translate(body.vertices, hullCentre);
}
// sum the properties of all compound parts of the parent body
var total = _totalProperties(body);
body.area = total.area;
body.parent = body;
body.position.x = total.centre.x;
body.position.y = total.centre.y;
body.positionPrev.x = total.centre.x;
body.positionPrev.y = total.centre.y;
Body.setMass(body, total.mass);
Body.setInertia(body, total.inertia);
Body.setPosition(body, total.centre);
};
/**
* Sets the position of the body instantly. Velocity, angle, force etc. are unchanged.
* @method setPosition
* @param {body} body
* @param {vector} position
*/
Body.setPosition = function(body, position) {
var delta = Vector.sub(position, body.position);
body.positionPrev.x += delta.x;
body.positionPrev.y += delta.y;
for (var i = 0; i < body.parts.length; i++) {
var part = body.parts[i];
part.position.x += delta.x;
part.position.y += delta.y;
Vertices.translate(part.vertices, delta);
Bounds.update(part.bounds, part.vertices, body.velocity);
}
};
/**
* Sets the angle of the body instantly. Angular velocity, position, force etc. are unchanged.
* @method setAngle
* @param {body} body
* @param {number} angle
*/
Body.setAngle = function(body, angle) {
var delta = angle - body.angle;
body.anglePrev += delta;
for (var i = 0; i < body.parts.length; i++) {
var part = body.parts[i];
part.angle += delta;
Vertices.rotate(part.vertices, delta, body.position);
Axes.rotate(part.axes, delta);
Bounds.update(part.bounds, part.vertices, body.velocity);
if (i > 0) {
Vector.rotateAbout(part.position, delta, body.position, part.position);
}
}
};
/**
* Sets the linear velocity of the body instantly. Position, angle, force etc. are unchanged. See also `Body.applyForce`.
* @method setVelocity
* @param {body} body
* @param {vector} velocity
*/
Body.setVelocity = function(body, velocity) {
body.positionPrev.x = body.position.x - velocity.x;
body.positionPrev.y = body.position.y - velocity.y;
body.velocity.x = velocity.x;
body.velocity.y = velocity.y;
body.speed = Vector.magnitude(body.velocity);
};
/**
* Sets the angular velocity of the body instantly. Position, angle, force etc. are unchanged. See also `Body.applyForce`.
* @method setAngularVelocity
* @param {body} body
* @param {number} velocity
*/
Body.setAngularVelocity = function(body, velocity) {
body.anglePrev = body.angle - velocity;
body.angularVelocity = velocity;
body.angularSpeed = Math.abs(body.angularVelocity);
};
/**
* Moves a body by a given vector relative to its current position, without imparting any velocity.
* @method translate
* @param {body} body
* @param {vector} translation
*/
Body.translate = function(body, translation) {
Body.setPosition(body, Vector.add(body.position, translation));
};
/**
* Rotates a body by a given angle relative to its current angle, without imparting any angular velocity.
* @method rotate
* @param {body} body
* @param {number} rotation
*/
Body.rotate = function(body, rotation) {
Body.setAngle(body, body.angle + rotation);
};
/**
* Scales the body, including updating physical properties (mass, area, axes, inertia), from a world-space point (default is body centre).
* @method scale
* @param {body} body
* @param {number} scaleX
* @param {number} scaleY
* @param {vector} [point]
*/
Body.scale = function(body, scaleX, scaleY, point) {
for (var i = 0; i < body.parts.length; i++) {
var part = body.parts[i];
// scale vertices
Vertices.scale(part.vertices, scaleX, scaleY, body.position);
// update properties
part.axes = Axes.fromVertices(part.vertices);
if (!body.isStatic) {
part.area = Vertices.area(part.vertices);
Body.setMass(part, body.density * part.area);
// update inertia (requires vertices to be at origin)
Vertices.translate(part.vertices, { x: -part.position.x, y: -part.position.y });
Body.setInertia(part, Vertices.inertia(part.vertices, part.mass));
Vertices.translate(part.vertices, { x: part.position.x, y: part.position.y });
}
// update bounds
Bounds.update(part.bounds, part.vertices, body.velocity);
}
// handle circles
if (body.circleRadius) {
if (scaleX === scaleY) {
body.circleRadius *= scaleX;
} else {
// body is no longer a circle
body.circleRadius = null;
}
}
if (!body.isStatic) {
var total = _totalProperties(body);
body.area = total.area;
Body.setMass(body, total.mass);
Body.setInertia(body, total.inertia);
}
};
/**
* Performs a simulation step for the given `body`, including updating position and angle using Verlet integration.
* @method update
* @param {body} body
* @param {number} deltaTime
* @param {number} timeScale
* @param {number} correction
*/
Body.update = function(body, deltaTime, timeScale, correction) {
var deltaTimeSquared = Math.pow(deltaTime * timeScale * body.timeScale, 2);
// from the previous step
var frictionAir = 1 - body.frictionAir * timeScale * body.timeScale,
velocityPrevX = body.position.x - body.positionPrev.x,
velocityPrevY = body.position.y - body.positionPrev.y;
// update velocity with Verlet integration
body.velocity.x = (velocityPrevX * frictionAir * correction) + (body.force.x / body.mass) * deltaTimeSquared;
body.velocity.y = (velocityPrevY * frictionAir * correction) + (body.force.y / body.mass) * deltaTimeSquared;
body.positionPrev.x = body.position.x;
body.positionPrev.y = body.position.y;
body.position.x += body.velocity.x;
body.position.y += body.velocity.y;
// update angular velocity with Verlet integration
body.angularVelocity = ((body.angle - body.anglePrev) * frictionAir * correction) + (body.torque / body.inertia) * deltaTimeSquared;
body.anglePrev = body.angle;
body.angle += body.angularVelocity;
// track speed and acceleration
body.speed = Vector.magnitude(body.velocity);
body.angularSpeed = Math.abs(body.angularVelocity);
// transform the body geometry
for (var i = 0; i < body.parts.length; i++) {
var part = body.parts[i];
Vertices.translate(part.vertices, body.velocity);
if (i > 0) {
part.position.x += body.velocity.x;
part.position.y += body.velocity.y;
}
if (body.angularVelocity !== 0) {
Vertices.rotate(part.vertices, body.angularVelocity, body.position);
Axes.rotate(part.axes, body.angularVelocity);
if (i > 0) {
Vector.rotateAbout(part.position, body.angularVelocity, body.position, part.position);
}
}
Bounds.update(part.bounds, part.vertices, body.velocity);
}
};
/**
* Applies a force to a body from a given world-space position, including resulting torque.
* @method applyForce
* @param {body} body
* @param {vector} position
* @param {vector} force
*/
Body.applyForce = function(body, position, force) {
body.force.x += force.x;
body.force.y += force.y;
var offset = { x: position.x - body.position.x, y: position.y - body.position.y };
body.torque += offset.x * force.y - offset.y * force.x;
};
/**
* Returns the sums of the properties of all compound parts of the parent body.
* @method _totalProperties
* @private