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Render.js
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Render.js
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/**
* The `Matter.Render` module is a simple HTML5 canvas based renderer for visualising instances of `Matter.Engine`.
* It is intended for development and debugging purposes, but may also be suitable for simple games.
* It includes a number of drawing options including wireframe, vector with support for sprites and viewports.
*
* @class Render
*/
var Render = {};
module.exports = Render;
var Common = require('../core/Common');
var Composite = require('../body/Composite');
var Bounds = require('../geometry/Bounds');
var Events = require('../core/Events');
var Grid = require('../collision/Grid');
var Vector = require('../geometry/Vector');
var Mouse = require('../core/Mouse');
(function() {
var _requestAnimationFrame,
_cancelAnimationFrame;
if (typeof window !== 'undefined') {
_requestAnimationFrame = window.requestAnimationFrame || window.webkitRequestAnimationFrame
|| window.mozRequestAnimationFrame || window.msRequestAnimationFrame
|| function(callback){ window.setTimeout(function() { callback(Common.now()); }, 1000 / 60); };
_cancelAnimationFrame = window.cancelAnimationFrame || window.mozCancelAnimationFrame
|| window.webkitCancelAnimationFrame || window.msCancelAnimationFrame;
}
/**
* Creates a new renderer. 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.
* See the properties section below for detailed information on what you can pass via the `options` object.
* @method create
* @param {object} [options]
* @return {render} A new renderer
*/
Render.create = function(options) {
var defaults = {
controller: Render,
engine: null,
element: null,
canvas: null,
mouse: null,
frameRequestId: null,
options: {
width: 800,
height: 600,
pixelRatio: 1,
background: '#18181d',
wireframeBackground: '#0f0f13',
hasBounds: !!options.bounds,
enabled: true,
wireframes: true,
showSleeping: true,
showDebug: false,
showBroadphase: false,
showBounds: false,
showVelocity: false,
showCollisions: false,
showSeparations: false,
showAxes: false,
showPositions: false,
showAngleIndicator: false,
showIds: false,
showShadows: false,
showVertexNumbers: false,
showConvexHulls: false,
showInternalEdges: false,
showMousePosition: false
}
};
var render = Common.extend(defaults, options);
if (render.canvas) {
render.canvas.width = render.options.width || render.canvas.width;
render.canvas.height = render.options.height || render.canvas.height;
}
render.mouse = options.mouse;
render.engine = options.engine;
render.canvas = render.canvas || _createCanvas(render.options.width, render.options.height);
render.context = render.canvas.getContext('2d');
render.textures = {};
render.bounds = render.bounds || {
min: {
x: 0,
y: 0
},
max: {
x: render.canvas.width,
y: render.canvas.height
}
};
if (render.options.pixelRatio !== 1) {
Render.setPixelRatio(render, render.options.pixelRatio);
}
if (Common.isElement(render.element)) {
render.element.appendChild(render.canvas);
} else if (!render.canvas.parentNode) {
Common.log('Render.create: options.element was undefined, render.canvas was created but not appended', 'warn');
}
return render;
};
/**
* Continuously updates the render canvas on the `requestAnimationFrame` event.
* @method run
* @param {render} render
*/
Render.run = function(render) {
(function loop(time){
render.frameRequestId = _requestAnimationFrame(loop);
Render.world(render);
})();
};
/**
* Ends execution of `Render.run` on the given `render`, by canceling the animation frame request event loop.
* @method stop
* @param {render} render
*/
Render.stop = function(render) {
_cancelAnimationFrame(render.frameRequestId);
};
/**
* Sets the pixel ratio of the renderer and updates the canvas.
* To automatically detect the correct ratio, pass the string `'auto'` for `pixelRatio`.
* @method setPixelRatio
* @param {render} render
* @param {number} pixelRatio
*/
Render.setPixelRatio = function(render, pixelRatio) {
var options = render.options,
canvas = render.canvas;
if (pixelRatio === 'auto') {
pixelRatio = _getPixelRatio(canvas);
}
options.pixelRatio = pixelRatio;
canvas.setAttribute('data-pixel-ratio', pixelRatio);
canvas.width = options.width * pixelRatio;
canvas.height = options.height * pixelRatio;
canvas.style.width = options.width + 'px';
canvas.style.height = options.height + 'px';
};
/**
* Positions and sizes the viewport around the given object bounds.
* Objects must have at least one of the following properties:
* - `object.bounds`
* - `object.position`
* - `object.min` and `object.max`
* - `object.x` and `object.y`
* @method lookAt
* @param {render} render
* @param {object[]} objects
* @param {vector} [padding]
* @param {bool} [center=true]
*/
Render.lookAt = function(render, objects, padding, center) {
center = typeof center !== 'undefined' ? center : true;
objects = Common.isArray(objects) ? objects : [objects];
padding = padding || {
x: 0,
y: 0
};
// find bounds of all objects
var bounds = {
min: { x: Infinity, y: Infinity },
max: { x: -Infinity, y: -Infinity }
};
for (var i = 0; i < objects.length; i += 1) {
var object = objects[i],
min = object.bounds ? object.bounds.min : (object.min || object.position || object),
max = object.bounds ? object.bounds.max : (object.max || object.position || object);
if (min && max) {
if (min.x < bounds.min.x)
bounds.min.x = min.x;
if (max.x > bounds.max.x)
bounds.max.x = max.x;
if (min.y < bounds.min.y)
bounds.min.y = min.y;
if (max.y > bounds.max.y)
bounds.max.y = max.y;
}
}
// find ratios
var width = (bounds.max.x - bounds.min.x) + 2 * padding.x,
height = (bounds.max.y - bounds.min.y) + 2 * padding.y,
viewHeight = render.canvas.height,
viewWidth = render.canvas.width,
outerRatio = viewWidth / viewHeight,
innerRatio = width / height,
scaleX = 1,
scaleY = 1;
// find scale factor
if (innerRatio > outerRatio) {
scaleY = innerRatio / outerRatio;
} else {
scaleX = outerRatio / innerRatio;
}
// enable bounds
render.options.hasBounds = true;
// position and size
render.bounds.min.x = bounds.min.x;
render.bounds.max.x = bounds.min.x + width * scaleX;
render.bounds.min.y = bounds.min.y;
render.bounds.max.y = bounds.min.y + height * scaleY;
// center
if (center) {
render.bounds.min.x += width * 0.5 - (width * scaleX) * 0.5;
render.bounds.max.x += width * 0.5 - (width * scaleX) * 0.5;
render.bounds.min.y += height * 0.5 - (height * scaleY) * 0.5;
render.bounds.max.y += height * 0.5 - (height * scaleY) * 0.5;
}
// padding
render.bounds.min.x -= padding.x;
render.bounds.max.x -= padding.x;
render.bounds.min.y -= padding.y;
render.bounds.max.y -= padding.y;
// update mouse
if (render.mouse) {
Mouse.setScale(render.mouse, {
x: (render.bounds.max.x - render.bounds.min.x) / render.canvas.width,
y: (render.bounds.max.y - render.bounds.min.y) / render.canvas.height
});
Mouse.setOffset(render.mouse, render.bounds.min);
}
};
/**
* Applies viewport transforms based on `render.bounds` to a render context.
* @method startViewTransform
* @param {render} render
*/
Render.startViewTransform = function(render) {
var boundsWidth = render.bounds.max.x - render.bounds.min.x,
boundsHeight = render.bounds.max.y - render.bounds.min.y,
boundsScaleX = boundsWidth / render.options.width,
boundsScaleY = boundsHeight / render.options.height;
render.context.setTransform(
render.options.pixelRatio / boundsScaleX, 0, 0,
render.options.pixelRatio / boundsScaleY, 0, 0
);
render.context.translate(-render.bounds.min.x, -render.bounds.min.y);
};
/**
* Resets all transforms on the render context.
* @method endViewTransform
* @param {render} render
*/
Render.endViewTransform = function(render) {
render.context.setTransform(render.options.pixelRatio, 0, 0, render.options.pixelRatio, 0, 0);
};
/**
* Renders the given `engine`'s `Matter.World` object.
* This is the entry point for all rendering and should be called every time the scene changes.
* @method world
* @param {render} render
*/
Render.world = function(render) {
var engine = render.engine,
world = engine.world,
canvas = render.canvas,
context = render.context,
options = render.options,
allBodies = Composite.allBodies(world),
allConstraints = Composite.allConstraints(world),
background = options.wireframes ? options.wireframeBackground : options.background,
bodies = [],
constraints = [],
i;
var event = {
timestamp: engine.timing.timestamp
};
Events.trigger(render, 'beforeRender', event);
// apply background if it has changed
if (render.currentBackground !== background)
_applyBackground(render, background);
// clear the canvas with a transparent fill, to allow the canvas background to show
context.globalCompositeOperation = 'source-in';
context.fillStyle = "transparent";
context.fillRect(0, 0, canvas.width, canvas.height);
context.globalCompositeOperation = 'source-over';
// handle bounds
if (options.hasBounds) {
// filter out bodies that are not in view
for (i = 0; i < allBodies.length; i++) {
var body = allBodies[i];
if (Bounds.overlaps(body.bounds, render.bounds))
bodies.push(body);
}
// filter out constraints that are not in view
for (i = 0; i < allConstraints.length; i++) {
var constraint = allConstraints[i],
bodyA = constraint.bodyA,
bodyB = constraint.bodyB,
pointAWorld = constraint.pointA,
pointBWorld = constraint.pointB;
if (bodyA) pointAWorld = Vector.add(bodyA.position, constraint.pointA);
if (bodyB) pointBWorld = Vector.add(bodyB.position, constraint.pointB);
if (!pointAWorld || !pointBWorld)
continue;
if (Bounds.contains(render.bounds, pointAWorld) || Bounds.contains(render.bounds, pointBWorld))
constraints.push(constraint);
}
// transform the view
Render.startViewTransform(render);
// update mouse
if (render.mouse) {
Mouse.setScale(render.mouse, {
x: (render.bounds.max.x - render.bounds.min.x) / render.options.width,
y: (render.bounds.max.y - render.bounds.min.y) / render.options.height
});
Mouse.setOffset(render.mouse, render.bounds.min);
}
} else {
constraints = allConstraints;
bodies = allBodies;
if (render.options.pixelRatio !== 1) {
render.context.setTransform(render.options.pixelRatio, 0, 0, render.options.pixelRatio, 0, 0);
}
}
if (!options.wireframes || (engine.enableSleeping && options.showSleeping)) {
// fully featured rendering of bodies
Render.bodies(render, bodies, context);
} else {
if (options.showConvexHulls)
Render.bodyConvexHulls(render, bodies, context);
// optimised method for wireframes only
Render.bodyWireframes(render, bodies, context);
}
if (options.showBounds)
Render.bodyBounds(render, bodies, context);
if (options.showAxes || options.showAngleIndicator)
Render.bodyAxes(render, bodies, context);
if (options.showPositions)
Render.bodyPositions(render, bodies, context);
if (options.showVelocity)
Render.bodyVelocity(render, bodies, context);
if (options.showIds)
Render.bodyIds(render, bodies, context);
if (options.showSeparations)
Render.separations(render, engine.pairs.list, context);
if (options.showCollisions)
Render.collisions(render, engine.pairs.list, context);
if (options.showVertexNumbers)
Render.vertexNumbers(render, bodies, context);
if (options.showMousePosition)
Render.mousePosition(render, render.mouse, context);
Render.constraints(constraints, context);
if (options.showBroadphase && engine.broadphase.controller === Grid)
Render.grid(render, engine.broadphase, context);
if (options.showDebug)
Render.debug(render, context);
if (options.hasBounds) {
// revert view transforms
Render.endViewTransform(render);
}
Events.trigger(render, 'afterRender', event);
};
/**
* Description
* @private
* @method debug
* @param {render} render
* @param {RenderingContext} context
*/
Render.debug = function(render, context) {
var c = context,
engine = render.engine,
world = engine.world,
metrics = engine.metrics,
options = render.options,
bodies = Composite.allBodies(world),
space = " ";
if (engine.timing.timestamp - (render.debugTimestamp || 0) >= 500) {
var text = "";
if (metrics.timing) {
text += "fps: " + Math.round(metrics.timing.fps) + space;
}
// @if DEBUG
if (metrics.extended) {
if (metrics.timing) {
text += "delta: " + metrics.timing.delta.toFixed(3) + space;
text += "correction: " + metrics.timing.correction.toFixed(3) + space;
}
text += "bodies: " + bodies.length + space;
if (engine.broadphase.controller === Grid)
text += "buckets: " + metrics.buckets + space;
text += "\n";
text += "collisions: " + metrics.collisions + space;
text += "pairs: " + engine.pairs.list.length + space;
text += "broad: " + metrics.broadEff + space;
text += "mid: " + metrics.midEff + space;
text += "narrow: " + metrics.narrowEff + space;
}
// @endif
render.debugString = text;
render.debugTimestamp = engine.timing.timestamp;
}
if (render.debugString) {
c.font = "12px Arial";
if (options.wireframes) {
c.fillStyle = 'rgba(255,255,255,0.5)';
} else {
c.fillStyle = 'rgba(0,0,0,0.5)';
}
var split = render.debugString.split('\n');
for (var i = 0; i < split.length; i++) {
c.fillText(split[i], 50, 50 + i * 18);
}
}
};
/**
* Description
* @private
* @method constraints
* @param {constraint[]} constraints
* @param {RenderingContext} context
*/
Render.constraints = function(constraints, context) {
var c = context;
for (var i = 0; i < constraints.length; i++) {
var constraint = constraints[i];
if (!constraint.render.visible || !constraint.pointA || !constraint.pointB)
continue;
var bodyA = constraint.bodyA,
bodyB = constraint.bodyB,
start,
end;
if (bodyA) {
start = Vector.add(bodyA.position, constraint.pointA);
} else {
start = constraint.pointA;
}
if (constraint.render.type === 'pin') {
c.beginPath();
c.arc(start.x, start.y, 3, 0, 2 * Math.PI);
c.closePath();
} else {
if (bodyB) {
end = Vector.add(bodyB.position, constraint.pointB);
} else {
end = constraint.pointB;
}
c.beginPath();
c.moveTo(start.x, start.y);
if (constraint.render.type === 'spring') {
var delta = Vector.sub(end, start),
normal = Vector.perp(Vector.normalise(delta)),
coils = Math.ceil(Common.clamp(constraint.length / 5, 12, 20)),
offset;
for (var j = 1; j < coils; j += 1) {
offset = j % 2 === 0 ? 1 : -1;
c.lineTo(
start.x + delta.x * (j / coils) + normal.x * offset * 4,
start.y + delta.y * (j / coils) + normal.y * offset * 4
);
}
}
c.lineTo(end.x, end.y);
}
if (constraint.render.lineWidth) {
c.lineWidth = constraint.render.lineWidth;
c.strokeStyle = constraint.render.strokeStyle;
c.stroke();
}
if (constraint.render.anchors) {
c.fillStyle = constraint.render.strokeStyle;
c.beginPath();
c.arc(start.x, start.y, 3, 0, 2 * Math.PI);
c.arc(end.x, end.y, 3, 0, 2 * Math.PI);
c.closePath();
c.fill();
}
}
};
/**
* Description
* @private
* @method bodyShadows
* @param {render} render
* @param {body[]} bodies
* @param {RenderingContext} context
*/
Render.bodyShadows = function(render, bodies, context) {
var c = context,
engine = render.engine;
for (var i = 0; i < bodies.length; i++) {
var body = bodies[i];
if (!body.render.visible)
continue;
if (body.circleRadius) {
c.beginPath();
c.arc(body.position.x, body.position.y, body.circleRadius, 0, 2 * Math.PI);
c.closePath();
} else {
c.beginPath();
c.moveTo(body.vertices[0].x, body.vertices[0].y);
for (var j = 1; j < body.vertices.length; j++) {
c.lineTo(body.vertices[j].x, body.vertices[j].y);
}
c.closePath();
}
var distanceX = body.position.x - render.options.width * 0.5,
distanceY = body.position.y - render.options.height * 0.2,
distance = Math.abs(distanceX) + Math.abs(distanceY);
c.shadowColor = 'rgba(0,0,0,0.15)';
c.shadowOffsetX = 0.05 * distanceX;
c.shadowOffsetY = 0.05 * distanceY;
c.shadowBlur = 1 + 12 * Math.min(1, distance / 1000);
c.fill();
c.shadowColor = null;
c.shadowOffsetX = null;
c.shadowOffsetY = null;
c.shadowBlur = null;
}
};
/**
* Description
* @private
* @method bodies
* @param {render} render
* @param {body[]} bodies
* @param {RenderingContext} context
*/
Render.bodies = function(render, bodies, context) {
var c = context,
engine = render.engine,
options = render.options,
showInternalEdges = options.showInternalEdges || !options.wireframes,
body,
part,
i,
k;
for (i = 0; i < bodies.length; i++) {
body = bodies[i];
if (!body.render.visible)
continue;
// handle compound parts
for (k = body.parts.length > 1 ? 1 : 0; k < body.parts.length; k++) {
part = body.parts[k];
if (!part.render.visible)
continue;
if (options.showSleeping && body.isSleeping) {
c.globalAlpha = 0.5 * part.render.opacity;
} else if (part.render.opacity !== 1) {
c.globalAlpha = part.render.opacity;
}
if (part.render.sprite && part.render.sprite.texture && !options.wireframes) {
// part sprite
var sprite = part.render.sprite,
texture = _getTexture(render, sprite.texture);
c.translate(part.position.x, part.position.y);
c.rotate(part.angle);
c.drawImage(
texture,
texture.width * -sprite.xOffset * sprite.xScale,
texture.height * -sprite.yOffset * sprite.yScale,
texture.width * sprite.xScale,
texture.height * sprite.yScale
);
// revert translation, hopefully faster than save / restore
c.rotate(-part.angle);
c.translate(-part.position.x, -part.position.y);
} else {
// part polygon
if (part.circleRadius) {
c.beginPath();
c.arc(part.position.x, part.position.y, part.circleRadius, 0, 2 * Math.PI);
} else {
c.beginPath();
c.moveTo(part.vertices[0].x, part.vertices[0].y);
for (var j = 1; j < part.vertices.length; j++) {
if (!part.vertices[j - 1].isInternal || showInternalEdges) {
c.lineTo(part.vertices[j].x, part.vertices[j].y);
} else {
c.moveTo(part.vertices[j].x, part.vertices[j].y);
}
if (part.vertices[j].isInternal && !showInternalEdges) {
c.moveTo(part.vertices[(j + 1) % part.vertices.length].x, part.vertices[(j + 1) % part.vertices.length].y);
}
}
c.lineTo(part.vertices[0].x, part.vertices[0].y);
c.closePath();
}
if (!options.wireframes) {
c.fillStyle = part.render.fillStyle;
if (part.render.lineWidth) {
c.lineWidth = part.render.lineWidth;
c.strokeStyle = part.render.strokeStyle;
c.stroke();
}
c.fill();
} else {
c.lineWidth = 1;
c.strokeStyle = '#bbb';
c.stroke();
}
}
c.globalAlpha = 1;
}
}
};
/**
* Optimised method for drawing body wireframes in one pass
* @private
* @method bodyWireframes
* @param {render} render
* @param {body[]} bodies
* @param {RenderingContext} context
*/
Render.bodyWireframes = function(render, bodies, context) {
var c = context,
showInternalEdges = render.options.showInternalEdges,
body,
part,
i,
j,
k;
c.beginPath();
// render all bodies
for (i = 0; i < bodies.length; i++) {
body = bodies[i];
if (!body.render.visible)
continue;
// handle compound parts
for (k = body.parts.length > 1 ? 1 : 0; k < body.parts.length; k++) {
part = body.parts[k];
c.moveTo(part.vertices[0].x, part.vertices[0].y);
for (j = 1; j < part.vertices.length; j++) {
if (!part.vertices[j - 1].isInternal || showInternalEdges) {
c.lineTo(part.vertices[j].x, part.vertices[j].y);
} else {
c.moveTo(part.vertices[j].x, part.vertices[j].y);
}
if (part.vertices[j].isInternal && !showInternalEdges) {
c.moveTo(part.vertices[(j + 1) % part.vertices.length].x, part.vertices[(j + 1) % part.vertices.length].y);
}
}
c.lineTo(part.vertices[0].x, part.vertices[0].y);
}
}
c.lineWidth = 1;
c.strokeStyle = '#bbb';
c.stroke();
};
/**
* Optimised method for drawing body convex hull wireframes in one pass
* @private
* @method bodyConvexHulls
* @param {render} render
* @param {body[]} bodies
* @param {RenderingContext} context
*/
Render.bodyConvexHulls = function(render, bodies, context) {
var c = context,
body,
part,
i,
j,
k;
c.beginPath();
// render convex hulls
for (i = 0; i < bodies.length; i++) {
body = bodies[i];
if (!body.render.visible || body.parts.length === 1)
continue;
c.moveTo(body.vertices[0].x, body.vertices[0].y);
for (j = 1; j < body.vertices.length; j++) {
c.lineTo(body.vertices[j].x, body.vertices[j].y);
}
c.lineTo(body.vertices[0].x, body.vertices[0].y);
}
c.lineWidth = 1;
c.strokeStyle = 'rgba(255,255,255,0.2)';
c.stroke();
};
/**
* Renders body vertex numbers.
* @private
* @method vertexNumbers
* @param {render} render
* @param {body[]} bodies
* @param {RenderingContext} context
*/
Render.vertexNumbers = function(render, bodies, context) {
var c = context,
i,
j,
k;
for (i = 0; i < bodies.length; i++) {
var parts = bodies[i].parts;
for (k = parts.length > 1 ? 1 : 0; k < parts.length; k++) {
var part = parts[k];
for (j = 0; j < part.vertices.length; j++) {
c.fillStyle = 'rgba(255,255,255,0.2)';
c.fillText(i + '_' + j, part.position.x + (part.vertices[j].x - part.position.x) * 0.8, part.position.y + (part.vertices[j].y - part.position.y) * 0.8);
}
}
}
};
/**
* Renders mouse position.
* @private
* @method mousePosition
* @param {render} render
* @param {mouse} mouse
* @param {RenderingContext} context
*/
Render.mousePosition = function(render, mouse, context) {
var c = context;
c.fillStyle = 'rgba(255,255,255,0.8)';
c.fillText(mouse.position.x + ' ' + mouse.position.y, mouse.position.x + 5, mouse.position.y - 5);
};
/**
* Draws body bounds
* @private
* @method bodyBounds
* @param {render} render
* @param {body[]} bodies
* @param {RenderingContext} context
*/
Render.bodyBounds = function(render, bodies, context) {
var c = context,
engine = render.engine,
options = render.options;
c.beginPath();
for (var i = 0; i < bodies.length; i++) {
var body = bodies[i];
if (body.render.visible) {
var parts = bodies[i].parts;
for (var j = parts.length > 1 ? 1 : 0; j < parts.length; j++) {
var part = parts[j];
c.rect(part.bounds.min.x, part.bounds.min.y, part.bounds.max.x - part.bounds.min.x, part.bounds.max.y - part.bounds.min.y);
}
}
}
if (options.wireframes) {
c.strokeStyle = 'rgba(255,255,255,0.08)';
} else {
c.strokeStyle = 'rgba(0,0,0,0.1)';
}
c.lineWidth = 1;
c.stroke();
};
/**
* Draws body angle indicators and axes
* @private
* @method bodyAxes
* @param {render} render
* @param {body[]} bodies
* @param {RenderingContext} context
*/
Render.bodyAxes = function(render, bodies, context) {
var c = context,
engine = render.engine,
options = render.options,
part,
i,
j,
k;
c.beginPath();
for (i = 0; i < bodies.length; i++) {
var body = bodies[i],
parts = body.parts;
if (!body.render.visible)
continue;
if (options.showAxes) {
// render all axes
for (j = parts.length > 1 ? 1 : 0; j < parts.length; j++) {
part = parts[j];
for (k = 0; k < part.axes.length; k++) {
var axis = part.axes[k];
c.moveTo(part.position.x, part.position.y);
c.lineTo(part.position.x + axis.x * 20, part.position.y + axis.y * 20);
}
}
} else {
for (j = parts.length > 1 ? 1 : 0; j < parts.length; j++) {
part = parts[j];
for (k = 0; k < part.axes.length; k++) {
// render a single axis indicator
c.moveTo(part.position.x, part.position.y);
c.lineTo((part.vertices[0].x + part.vertices[part.vertices.length-1].x) / 2,
(part.vertices[0].y + part.vertices[part.vertices.length-1].y) / 2);
}
}
}
}
if (options.wireframes) {
c.strokeStyle = 'indianred';
c.lineWidth = 1;
} else {
c.strokeStyle = 'rgba(255, 255, 255, 0.4)';
c.globalCompositeOperation = 'overlay';
c.lineWidth = 2;
}
c.stroke();
c.globalCompositeOperation = 'source-over';
};
/**
* Draws body positions
* @private
* @method bodyPositions
* @param {render} render
* @param {body[]} bodies
* @param {RenderingContext} context
*/
Render.bodyPositions = function(render, bodies, context) {
var c = context,
engine = render.engine,
options = render.options,
body,
part,
i,
k;
c.beginPath();
// render current positions
for (i = 0; i < bodies.length; i++) {
body = bodies[i];
if (!body.render.visible)
continue;
// handle compound parts
for (k = 0; k < body.parts.length; k++) {
part = body.parts[k];
c.arc(part.position.x, part.position.y, 3, 0, 2 * Math.PI, false);
c.closePath();
}
}
if (options.wireframes) {
c.fillStyle = 'indianred';
} else {
c.fillStyle = 'rgba(0,0,0,0.5)';
}
c.fill();
c.beginPath();
// render previous positions
for (i = 0; i < bodies.length; i++) {
body = bodies[i];
if (body.render.visible) {
c.arc(body.positionPrev.x, body.positionPrev.y, 2, 0, 2 * Math.PI, false);
c.closePath();
}
}