HTML5 Canvas可拖动的弹性大树摇摆动画

<!DOCTYPE html>
<html lang="en">
<head>
<title>HTML5 Canvas可拖动的弹性大树摇摆动画DEMO演示</title>
<meta charset="utf-8" />
<link rel="stylesheet" href="css/style.css" type="text/css" media="screen, projection" />
<script type="text/javascript" src="js/verlet-1.0.0.js"></script>
</head>
<body>
<div style="text-align:center;clear:both;">
<script src="/gg_bd_ad_720x90.js" type="text/javascript"></script>
<script src="/follow.js" type="text/javascript"></script>
</div>
<canvas id="scratch" style="width: 800px; height: 500px;"></canvas>
<script type="text/javascript">function lerp(a, b, p) {return (b - a) * p + a;}VerletJS.prototype.tree = function (origin, depth, branchLength, segmentCoef, theta) {var lineCoef = 0.7;this.origin = origin;this.base = new Particle(origin);this.root = new Particle(origin.add(new Vec2(0, 10)));var composite = new this.Composite();composite.particles.push(this.base);composite.particles.push(this.root);composite.pin(0);composite.pin(1);var branch = function (parent, i, nMax, coef, normal) {var particle = new Particle(parent.pos.add(normal.scale(branchLength * coef)));composite.particles.push(particle);var dc = new DistanceConstraint(parent, particle, lineCoef);dc.p = i / nMax; // a hint for drawingcomposite.constraints.push(dc);particle.leaf = !(i < nMax);if (i < nMax) {var a = branch(particle, i + 1, nMax, coef * coef, normal.rotate(new Vec2(0, 0), -theta));var b = branch(particle, i + 1, nMax, coef * coef, normal.rotate(new Vec2(0, 0), theta));var jointStrength = lerp(0.7, 0, i / nMax);composite.constraints.push(new AngleConstraint(parent, particle, a, jointStrength));composite.constraints.push(new AngleConstraint(parent, particle, b, jointStrength));}return particle;}var firstBranch = branch(this.base, 0, depth, segmentCoef, new Vec2(0, -1));composite.constraints.push(new AngleConstraint(this.root, this.base, firstBranch, 1));// animates the tree at the beginningvar noise = 10;var i;for (i = 0; i < composite.particles.length; ++i)composite.particles[i].pos.mutableAdd(new Vec2(Math.floor(Math.random() * noise, Math.floor(Math.random() * noise))));this.composites.push(composite);return composite;}window.onload = function () {var canvas = document.getElementById("scratch");// canvas dimensionsvar width = parseInt(canvas.style.width);var height = parseInt(canvas.style.height);// retinavar dpr = window.devicePixelRatio || 1;canvas.width = width * dpr;canvas.height = height * dpr;canvas.getContext("2d").scale(dpr, dpr);// simulationvar sim = new VerletJS(width, height, canvas);sim.gravity = new Vec2(0, 0);sim.friction = 0.98;// entitiesvar tree1 = sim.tree(new Vec2(width / 4, height - 120), 5, 70, 0.95, (Math.PI / 2) / 3);var tree2 = sim.tree(new Vec2(width - width / 4, height - 120), 5, 70, 0.95, (Math.PI / 2) / 3);tree2.drawParticles = function (ctx, composite) {var i;for (i = 0; i < composite.particles.length; ++i) {var particle = composite.particles[i];if (particle.leaf) {ctx.beginPath();ctx.arc(particle.pos.x, particle.pos.y, 25, 0, 2 * Math.PI);ctx.fillStyle = "#679d7c";ctx.fill();}}}tree2.drawConstraints = function (ctx, composite) {var i;ctx.save();ctx.strokeStyle = "#543324";ctx.lineCap = "round";for (i = 0; i < composite.constraints.length; ++i) {var constraint = composite.constraints[i];if (!(constraint instanceof DistanceConstraint && typeof constraint.p != "undefined"))continue;ctx.beginPath();ctx.moveTo(constraint.a.pos.x, constraint.a.pos.y);ctx.lineTo(constraint.b.pos.x, constraint.b.pos.y);ctx.lineWidth = lerp(10, 2, constraint.p);ctx.stroke();}ctx.restore();}// animation loopvar loop = function () {sim.frame(16);sim.draw();requestAnimFrame(loop);};loop();};</script></body>
</html>

css部分style.css

body {background: #e4e6e8;background: -moz-linear-gradient(top,  #ffffff 0%, #e4e8ee 20%, #e4e8ee 80%, #ffffff 100%); /* FF3.6+ */background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#ffffff), color-stop(20%,#e4e8ee), color-stop(80%,#e4e8ee), color-stop(100%,#ffffff)); /* Chrome,Safari4+ */background: -webkit-linear-gradient(top,  #ffffff 0%,#e4e8ee 20%,#e4e8ee 80%,#ffffff 100%); /* Chrome10+,Safari5.1+ */background: -o-linear-gradient(top,  #ffffff 0%,#e4e8ee 20%,#e4e8ee 80%,#ffffff 100%); /* Opera 11.10+ */background: -ms-linear-gradient(top,  #ffffff 0%,#e4e8ee 20%,#e4e8ee 80%,#ffffff 100%); /* IE10+ */background: linear-gradient(to bottom,  #ffffff 0%,#e4e8ee 20%,#e4e8ee 80%,#ffffff 100%); /* W3C */filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#ffffff', endColorstr='#ffffff',GradientType=0 ); /* IE6-9 */color: #969ba3;font-family: "Libre Baskerville", sans-serif;font-weight: 400;line-height: 1.2em;
}a {color: #26ae90;
}a:hover {color: #0b6b6a;
}b {color: #696e76;
}ul {list-style: square;
}li {margin: 4px 0px;
}#header {width: 800px;margin: 0px auto;font-size: 10pt;
}h1 {display: block;font-weight: 700;margin: 50px 0px 0px 0px;padding-bottom: 3px;border-bottom: 1px solid rgba(0,0,0,0.05);text-shadow: 1px 1px 0px #fff;
}h1:after {content: "";display: block;padding-bottom: 20px;border-bottom: 1px solid rgba(0,0,0,0.05);
}h1 a {color: #969ba3;text-decoration: none;
}h1 a:hover {color: #585a5d;text-decoration: none;
}h1 em {color: #444;font-style: normal;
}h4 {color: #444;font-weight: 700;font-size: 12pt;margin: 20px 0px 0px 0px;
}canvas {display: block;margin: 5px auto;background: #fff;box-shadow: 2px 2px 8px 0px rgba(0,0,0,0.1);clear: both;/* disable selection of canvas */-moz-user-select: none;-webkit-user-select: none;-o-user-select:none;-ms-user-select:none;-khtml-user-select:none;user-select: none;
}#footer {line-height: 1.5em;font-size: 8pt;border-top: 1px solid rgba(0,0,0,0.05);padding-top: 3px;width: 800px;margin: 0px auto 100px auto;
}#footer:before {content: "";display: block;padding-top: 20px;border-top: 1px solid rgba(0,0,0,0.05);
}#bsa {display: inline-block;float: right;width: 150px;padding-top: 30px;font-family: sans-serif;
}body .one .bsa_it_ad { background: transparent; border: none; font-family: inherit; padding: 0 15px 0 10px; margin: 0; text-align: left; }
body .one .bsa_it_ad:hover img { -moz-box-shadow: 0 0 3px #000; -webkit-box-shadow: 0 0 3px #000; box-shadow: 0 0 3px #000; }
body .one .bsa_it_ad .bsa_it_i { display: block; padding: 0; float: none; margin: 0 0 5px; }
body .one .bsa_it_ad .bsa_it_i img { padding: 0; border: none; }
body .one .bsa_it_ad .bsa_it_t { padding: 6px 0; }
body .one .bsa_it_ad .bsa_it_d { padding: 0; font-size: 10px; color: #333; }
body .one .bsa_it_p { display: none; }
body #bsap_aplink, body #bsap_aplink:hover { display: block; font-size: 9px; margin: 12px 15px 0; text-align: right; }

js部分verlet.js

;(function(e,t,n){function i(n,s){if(!t[n]){if(!e[n]){var o=typeof require=="function"&&require;if(!s&&o)return o(n,!0);if(r)return r(n,!0);throw new Error("Cannot find module '"+n+"'")}var u=t[n]={exports:{}};e[n][0].call(u.exports,function(t){var r=e[n][1][t];return i(r?r:t)},u,u.exports)}return t[n].exports}var r=typeof require=="function"&&require;for(var s=0;s<n.length;s++)i(n[s]);return i})({1:[function(require,module,exports){//this exports all the verlet methods globally, so that the demos work.var VerletJS = require('./verlet')
var constraint = require('./constraint')require('./objects') //patches VerletJS.prototype (bad)
window.Vec2 = require('./vec2')
window.VerletJS = VerletJSwindow.Particle = VerletJS.Particlewindow.DistanceConstraint = constraint.DistanceConstraint
window.PinConstraint      = constraint.PinConstraint
window.AngleConstraint    = constraint.AngleConstraint},{"./verlet":2,"./constraint":3,"./objects":4,"./vec2":5}],3:[function(require,module,exports){/*
Copyright 2013 Sub Protocol and other contributors
http://subprotocol.com/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.
*/// DistanceConstraint -- constrains to initial distance
// PinConstraint -- constrains to static/fixed point
// AngleConstraint -- constrains 3 particles to an angleexports.DistanceConstraint = DistanceConstraint
exports.PinConstraint = PinConstraint
exports.AngleConstraint = AngleConstraintfunction DistanceConstraint(a, b, stiffness, distance /*optional*/) {this.a = a;this.b = b;this.distance = typeof distance != "undefined" ? distance : a.pos.sub(b.pos).length();this.stiffness = stiffness;
}DistanceConstraint.prototype.relax = function(stepCoef) {var normal = this.a.pos.sub(this.b.pos);var m = normal.length2();normal.mutableScale(((this.distance*this.distance - m)/m)*this.stiffness*stepCoef);this.a.pos.mutableAdd(normal);this.b.pos.mutableSub(normal);
}DistanceConstraint.prototype.draw = function(ctx) {ctx.beginPath();ctx.moveTo(this.a.pos.x, this.a.pos.y);ctx.lineTo(this.b.pos.x, this.b.pos.y);ctx.strokeStyle = "#d8dde2";ctx.stroke();
}function PinConstraint(a, pos) {this.a = a;this.pos = (new Vec2()).mutableSet(pos);
}PinConstraint.prototype.relax = function(stepCoef) {this.a.pos.mutableSet(this.pos);
}PinConstraint.prototype.draw = function(ctx) {ctx.beginPath();ctx.arc(this.pos.x, this.pos.y, 6, 0, 2*Math.PI);ctx.fillStyle = "rgba(0,153,255,0.1)";ctx.fill();
}function AngleConstraint(a, b, c, stiffness) {this.a = a;this.b = b;this.c = c;this.angle = this.b.pos.angle2(this.a.pos, this.c.pos);this.stiffness = stiffness;
}AngleConstraint.prototype.relax = function(stepCoef) {var angle = this.b.pos.angle2(this.a.pos, this.c.pos);var diff = angle - this.angle;if (diff <= -Math.PI)diff += 2*Math.PI;else if (diff >= Math.PI)diff -= 2*Math.PI;diff *= stepCoef*this.stiffness;this.a.pos = this.a.pos.rotate(this.b.pos, diff);this.c.pos = this.c.pos.rotate(this.b.pos, -diff);this.b.pos = this.b.pos.rotate(this.a.pos, diff);this.b.pos = this.b.pos.rotate(this.c.pos, -diff);
}AngleConstraint.prototype.draw = function(ctx) {ctx.beginPath();ctx.moveTo(this.a.pos.x, this.a.pos.y);ctx.lineTo(this.b.pos.x, this.b.pos.y);ctx.lineTo(this.c.pos.x, this.c.pos.y);var tmp = ctx.lineWidth;ctx.lineWidth = 5;ctx.strokeStyle = "rgba(255,255,0,0.2)";ctx.stroke();ctx.lineWidth = tmp;
}},{}],5:[function(require,module,exports){/*
Copyright 2013 Sub Protocol and other contributors
http://subprotocol.com/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.
*/// A simple 2-dimensional vector implementationmodule.exports = Vec2function Vec2(x, y) {this.x = x || 0;this.y = y || 0;
}Vec2.prototype.add = function(v) {return new Vec2(this.x + v.x, this.y + v.y);
}Vec2.prototype.sub = function(v) {return new Vec2(this.x - v.x, this.y - v.y);
}Vec2.prototype.mul = function(v) {return new Vec2(this.x * v.x, this.y * v.y);
}Vec2.prototype.div = function(v) {return new Vec2(this.x / v.x, this.y / v.y);
}Vec2.prototype.scale = function(coef) {return new Vec2(this.x*coef, this.y*coef);
}Vec2.prototype.mutableSet = function(v) {this.x = v.x;this.y = v.y;return this;
}Vec2.prototype.mutableAdd = function(v) {this.x += v.x;this.y += v.y;return this;
}Vec2.prototype.mutableSub = function(v) {this.x -= v.x;this.y -= v.y;return this;
}Vec2.prototype.mutableMul = function(v) {this.x *= v.x;this.y *= v.y;return this;
}Vec2.prototype.mutableDiv = function(v) {this.x /= v.x;this.y /= v.y;return this;
}Vec2.prototype.mutableScale = function(coef) {this.x *= coef;this.y *= coef;return this;
}Vec2.prototype.equals = function(v) {return this.x == v.x && this.y == v.y;
}Vec2.prototype.epsilonEquals = function(v, epsilon) {return Math.abs(this.x - v.x) <= epsilon && Math.abs(this.y - v.y) <= epsilon;
}Vec2.prototype.length = function(v) {return Math.sqrt(this.x*this.x + this.y*this.y);
}Vec2.prototype.length2 = function(v) {return this.x*this.x + this.y*this.y;
}Vec2.prototype.dist = function(v) {return Math.sqrt(this.dist2(v));
}Vec2.prototype.dist2 = function(v) {var x = v.x - this.x;var y = v.y - this.y;return x*x + y*y;
}Vec2.prototype.normal = function() {var m = Math.sqrt(this.x*this.x + this.y*this.y);return new Vec2(this.x/m, this.y/m);
}Vec2.prototype.dot = function(v) {return this.x*v.x + this.y*v.y;
}Vec2.prototype.angle = function(v) {return Math.atan2(this.x*v.y-this.y*v.x,this.x*v.x+this.y*v.y);
}Vec2.prototype.angle2 = function(vLeft, vRight) {return vLeft.sub(this).angle(vRight.sub(this));
}Vec2.prototype.rotate = function(origin, theta) {var x = this.x - origin.x;var y = this.y - origin.y;return new Vec2(x*Math.cos(theta) - y*Math.sin(theta) + origin.x, x*Math.sin(theta) + y*Math.cos(theta) + origin.y);
}Vec2.prototype.toString = function() {return "(" + this.x + ", " + this.y + ")";
}function test_Vec2() {var assert = function(label, expression) {console.log("Vec2(" + label + "): " + (expression == true ? "PASS" : "FAIL"));if (expression != true)throw "assertion failed";};assert("equality", (new Vec2(5,3).equals(new Vec2(5,3))));assert("epsilon equality", (new Vec2(1,2).epsilonEquals(new Vec2(1.01,2.02), 0.03)));assert("epsilon non-equality", !(new Vec2(1,2).epsilonEquals(new Vec2(1.01,2.02), 0.01)));assert("addition", (new Vec2(1,1)).add(new Vec2(2, 3)).equals(new Vec2(3, 4)));assert("subtraction", (new Vec2(4,3)).sub(new Vec2(2, 1)).equals(new Vec2(2, 2)));assert("multiply", (new Vec2(2,4)).mul(new Vec2(2, 1)).equals(new Vec2(4, 4)));assert("divide", (new Vec2(4,2)).div(new Vec2(2, 2)).equals(new Vec2(2, 1)));assert("scale", (new Vec2(4,3)).scale(2).equals(new Vec2(8, 6)));assert("mutable set", (new Vec2(1,1)).mutableSet(new Vec2(2, 3)).equals(new Vec2(2, 3)));assert("mutable addition", (new Vec2(1,1)).mutableAdd(new Vec2(2, 3)).equals(new Vec2(3, 4)));assert("mutable subtraction", (new Vec2(4,3)).mutableSub(new Vec2(2, 1)).equals(new Vec2(2, 2)));assert("mutable multiply", (new Vec2(2,4)).mutableMul(new Vec2(2, 1)).equals(new Vec2(4, 4)));assert("mutable divide", (new Vec2(4,2)).mutableDiv(new Vec2(2, 2)).equals(new Vec2(2, 1)));assert("mutable scale", (new Vec2(4,3)).mutableScale(2).equals(new Vec2(8, 6)));assert("length", Math.abs((new Vec2(4,4)).length() - 5.65685) <= 0.00001);assert("length2", (new Vec2(2,4)).length2() == 20);assert("dist", Math.abs((new Vec2(2,4)).dist(new Vec2(3,5)) - 1.4142135) <= 0.000001);assert("dist2", (new Vec2(2,4)).dist2(new Vec2(3,5)) == 2);var normal = (new Vec2(2,4)).normal()assert("normal", Math.abs(normal.length() - 1.0) <= 0.00001 && normal.epsilonEquals(new Vec2(0.4472, 0.89443), 0.0001));assert("dot", (new Vec2(2,3)).dot(new Vec2(4,1)) == 11);assert("angle", (new Vec2(0,-1)).angle(new Vec2(1,0))*(180/Math.PI) == 90);assert("angle2", (new Vec2(1,1)).angle2(new Vec2(1,0), new Vec2(2,1))*(180/Math.PI) == 90);assert("rotate", (new Vec2(2,0)).rotate(new Vec2(1,0), Math.PI/2).equals(new Vec2(1,1)));assert("toString", (new Vec2(2,4)) == "(2, 4)");
}},{}],4:[function(require,module,exports){var VerletJS = require('./verlet')
var Particle = VerletJS.Particle
var constraints = require('./constraint')
var DistanceConstraint = constraints.DistanceConstraintVerletJS.prototype.point = function(pos) {var composite = new this.Composite();composite.particles.push(new Particle(pos));this.composites.push(composite);return composite;
}VerletJS.prototype.lineSegments = function(vertices, stiffness) {var i;var composite = new this.Composite();for (i in vertices) {composite.particles.push(new Particle(vertices[i]));if (i > 0)composite.constraints.push(new DistanceConstraint(composite.particles[i], composite.particles[i-1], stiffness));}this.composites.push(composite);return composite;
}VerletJS.prototype.cloth = function(origin, width, height, segments, pinMod, stiffness) {var composite = new this.Composite();var xStride = width/segments;var yStride = height/segments;var x,y;for (y=0;y<segments;++y) {for (x=0;x<segments;++x) {var px = origin.x + x*xStride - width/2 + xStride/2;var py = origin.y + y*yStride - height/2 + yStride/2;composite.particles.push(new Particle(new Vec2(px, py)));if (x > 0)composite.constraints.push(new DistanceConstraint(composite.particles[y*segments+x], composite.particles[y*segments+x-1], stiffness));if (y > 0)composite.constraints.push(new DistanceConstraint(composite.particles[y*segments+x], composite.particles[(y-1)*segments+x], stiffness));}}for (x=0;x<segments;++x) {if (x%pinMod == 0)composite.pin(x);}this.composites.push(composite);return composite;
}VerletJS.prototype.tire = function(origin, radius, segments, spokeStiffness, treadStiffness) {var stride = (2*Math.PI)/segments;var i;var composite = new this.Composite();// particlesfor (i=0;i<segments;++i) {var theta = i*stride;composite.particles.push(new Particle(new Vec2(origin.x + Math.cos(theta)*radius, origin.y + Math.sin(theta)*radius)));}var center = new Particle(origin);composite.particles.push(center);// constraintsfor (i=0;i<segments;++i) {composite.constraints.push(new DistanceConstraint(composite.particles[i], composite.particles[(i+1)%segments], treadStiffness));composite.constraints.push(new DistanceConstraint(composite.particles[i], center, spokeStiffness))composite.constraints.push(new DistanceConstraint(composite.particles[i], composite.particles[(i+5)%segments], treadStiffness));}this.composites.push(composite);return composite;
}},{"./verlet":2,"./constraint":3}],2:[function(require,module,exports){window.requestAnimFrame = window.requestAnimationFrame
|| window.webkitRequestAnimationFrame
|| window.mozRequestAnimationFrame
|| window.oRequestAnimationFrame
|| window.msRequestAnimationFrame
|| function(callback) {window.setTimeout(callback, 1000 / 60);
};var Vec2 = require('./vec2')exports = module.exports = VerletJS
exports.Particle = Particle
exports.Composite = Compositefunction Particle(pos) {this.pos = (new Vec2()).mutableSet(pos);this.lastPos = (new Vec2()).mutableSet(pos);
}Particle.prototype.draw = function(ctx) {ctx.beginPath();ctx.arc(this.pos.x, this.pos.y, 2, 0, 2*Math.PI);ctx.fillStyle = "#2dad8f";ctx.fill();
}function VerletJS(width, height, canvas) {this.width = width;this.height = height;this.canvas = canvas;this.ctx = canvas.getContext("2d");this.mouse = new Vec2(0,0);this.mouseDown = false;this.draggedEntity = null;this.selectionRadius = 20;this.highlightColor = "#4f545c";this.bounds = function (particle) {if (particle.pos.y > this.height-1)particle.pos.y = this.height-1;if (particle.pos.x < 0)particle.pos.x = 0;if (particle.pos.x > this.width-1)particle.pos.x = this.width-1;}var _this = this;// prevent context menuthis.canvas.oncontextmenu = function(e) {e.preventDefault();};this.canvas.onmousedown = function(e) {_this.mouseDown = true;var nearest = _this.nearestEntity();if (nearest) {_this.draggedEntity = nearest;}};this.canvas.onmouseup = function(e) {_this.mouseDown = false;_this.draggedEntity = null;};this.canvas.onmousemove = function(e) {var rect = _this.canvas.getBoundingClientRect();_this.mouse.x = e.clientX - rect.left;_this.mouse.y = e.clientY - rect.top;};  // simulation paramsthis.gravity = new Vec2(0,0.2);this.friction = 0.99;this.groundFriction = 0.8;// holds composite entitiesthis.composites = [];
}VerletJS.prototype.Composite = Compositefunction Composite() {this.particles = [];this.constraints = [];this.drawParticles = null;this.drawConstraints = null;
}Composite.prototype.pin = function(index, pos) {pos = pos || this.particles[index].pos;var pc = new PinConstraint(this.particles[index], pos);this.constraints.push(pc);return pc;
}VerletJS.prototype.frame = function(step) {var i, j, c;for (c in this.composites) {for (i in this.composites[c].particles) {var particles = this.composites[c].particles;// calculate velocityvar velocity = particles[i].pos.sub(particles[i].lastPos).scale(this.friction);// ground frictionif (particles[i].pos.y >= this.height-1 && velocity.length2() > 0.000001) {var m = velocity.length();velocity.x /= m;velocity.y /= m;velocity.mutableScale(m*this.groundFriction);}// save last good stateparticles[i].lastPos.mutableSet(particles[i].pos);// gravityparticles[i].pos.mutableAdd(this.gravity);// inertia  particles[i].pos.mutableAdd(velocity);}}// handle dragging of entitiesif (this.draggedEntity)this.draggedEntity.pos.mutableSet(this.mouse);// relaxvar stepCoef = 1/step;for (c in this.composites) {var constraints = this.composites[c].constraints;for (i=0;i<step;++i)for (j in constraints)constraints[j].relax(stepCoef);}// bounds checkingfor (c in this.composites) {var particles = this.composites[c].particles;for (i in particles)this.bounds(particles[i]);}
}VerletJS.prototype.draw = function() {var i, c;this.ctx.clearRect(0, 0, this.canvas.width, this.canvas.height);  for (c in this.composites) {// draw constraintsif (this.composites[c].drawConstraints) {this.composites[c].drawConstraints(this.ctx, this.composites[c]);} else {var constraints = this.composites[c].constraints;for (i in constraints)constraints[i].draw(this.ctx);}// draw particlesif (this.composites[c].drawParticles) {this.composites[c].drawParticles(this.ctx, this.composites[c]);} else {var particles = this.composites[c].particles;for (i in particles)particles[i].draw(this.ctx);}}// highlight nearest / dragged entityvar nearest = this.draggedEntity || this.nearestEntity();if (nearest) {this.ctx.beginPath();this.ctx.arc(nearest.pos.x, nearest.pos.y, 8, 0, 2*Math.PI);this.ctx.strokeStyle = this.highlightColor;this.ctx.stroke();}
}VerletJS.prototype.nearestEntity = function() {var c, i;var d2Nearest = 0;var entity = null;var constraintsNearest = null;// find nearest pointfor (c in this.composites) {var particles = this.composites[c].particles;for (i in particles) {var d2 = particles[i].pos.dist2(this.mouse);if (d2 <= this.selectionRadius*this.selectionRadius && (entity == null || d2 < d2Nearest)) {entity = particles[i];constraintsNearest = this.composites[c].constraints;d2Nearest = d2;}}}// search for pinned constraints for this entityfor (i in constraintsNearest)if (constraintsNearest[i] instanceof PinConstraint && constraintsNearest[i].a == entity)entity = constraintsNearest[i];return entity;
}},{"./vec2":5}]},{},[1])
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exports all the verlet methods globally, so that the demos work.\n\nvar VerletJS = require('./verlet')\nvar constraint = require('./constraint')\n\t\t\t\t\t\t\t\t require('./objects') //patches VerletJS.prototype (bad)\nwindow.Vec2 = require('./vec2')\nwindow.VerletJS = VerletJS\n\nwindow.Particle = VerletJS.Particle\n\nwindow.DistanceConstraint = constraint.DistanceConstraint\nwindow.PinConstraint      = constraint.PinConstraint\nwindow.AngleConstraint    = constraint.AngleConstraint\n\n\n","\n/*\nCopyright 2013 Sub Protocol and other contributors\nhttp://subprotocol.com/\n\nPermission is hereby granted, free of charge, to any person obtaining\na copy of this software and associated documentation files (the\n\"Software\"), to deal in the Software without restriction, including\nwithout limitation the rights to use, copy, modify, merge, publish,\ndistribute, sublicense, and/or sell copies of the Software, and to\npermit persons to whom the Software is furnished to do so, subject to\nthe following conditions:\n\nThe above copyright notice and this permission notice shall be\nincluded in all copies or substantial portions of the Software.\n\nTHE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND,\nEXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\nMERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND\nNONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE\nLIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION\nOF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION\nWITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.\n*/\n\n// DistanceConstraint -- constrains to initial distance\n// PinConstraint -- constrains to static/fixed point\n// AngleConstraint -- constrains 3 particles to an angle\n\nexports.DistanceConstraint = DistanceConstraint\nexports.PinConstraint = PinConstraint\nexports.AngleConstraint = AngleConstraint\n\nfunction DistanceConstraint(a, b, stiffness, distance /*optional*/) {\n\tthis.a = a;\n\tthis.b = b;\n\tthis.distance = typeof distance != \"undefined\" ? distance : a.pos.sub(b.pos).length();\n\tthis.stiffness = stiffness;\n}\n\nDistanceConstraint.prototype.relax = function(stepCoef) {\n\tvar normal = this.a.pos.sub(this.b.pos);\n\tvar m = normal.length2();\n\tnormal.mutableScale(((this.distance*this.distance - m)/m)*this.stiffness*stepCoef);\n\tthis.a.pos.mutableAdd(normal);\n\tthis.b.pos.mutableSub(normal);\n}\n\nDistanceConstraint.prototype.draw = function(ctx) {\n\tctx.beginPath();\n\tctx.moveTo(this.a.pos.x, this.a.pos.y);\n\tctx.lineTo(this.b.pos.x, this.b.pos.y);\n\tctx.strokeStyle = \"#d8dde2\";\n\tctx.stroke();\n}\n\n\n\nfunction PinConstraint(a, pos) {\n\tthis.a = a;\n\tthis.pos = (new Vec2()).mutableSet(pos);\n}\n\nPinConstraint.prototype.relax = function(stepCoef) {\n\tthis.a.pos.mutableSet(this.pos);\n}\n\nPinConstraint.prototype.draw = function(ctx) {\n\tctx.beginPath();\n\tctx.arc(this.pos.x, this.pos.y, 6, 0, 2*Math.PI);\n\tctx.fillStyle = \"rgba(0,153,255,0.1)\";\n\tctx.fill();\n}\n\n\nfunction AngleConstraint(a, b, c, stiffness) {\n\tthis.a = a;\n\tthis.b = b;\n\tthis.c = c;\n\tthis.angle = this.b.pos.angle2(this.a.pos, this.c.pos);\n\tthis.stiffness = stiffness;\n}\n\nAngleConstraint.prototype.relax = function(stepCoef) {\n\tvar angle = this.b.pos.angle2(this.a.pos, this.c.pos);\n\tvar diff = angle - this.angle;\n\t\n\tif (diff <= -Math.PI)\n\t\tdiff += 2*Math.PI;\n\telse if (diff >= Math.PI)\n\t\tdiff -= 2*Math.PI;\n\n\tdiff *= stepCoef*this.stiffness;\n\t\n\tthis.a.pos = this.a.pos.rotate(this.b.pos, diff);\n\tthis.c.pos = this.c.pos.rotate(this.b.pos, -diff);\n\tthis.b.pos = this.b.pos.rotate(this.a.pos, diff);\n\tthis.b.pos = this.b.pos.rotate(this.c.pos, -diff);\n}\n\nAngleConstraint.prototype.draw = function(ctx) {\n\tctx.beginPath();\n\tctx.moveTo(this.a.pos.x, this.a.pos.y);\n\tctx.lineTo(this.b.pos.x, this.b.pos.y);\n\tctx.lineTo(this.c.pos.x, this.c.pos.y);\n\tvar tmp = ctx.lineWidth;\n\tctx.lineWidth = 5;\n\tctx.strokeStyle = \"rgba(255,255,0,0.2)\";\n\tctx.stroke();\n\tctx.lineWidth = tmp;\n}\n","\n/*\nCopyright 2013 Sub Protocol and other contributors\nhttp://subprotocol.com/\n\nPermission is hereby granted, free of charge, to any person obtaining\na copy of this software and associated documentation files (the\n\"Software\"), to deal in the Software without restriction, including\nwithout limitation the rights to use, copy, modify, merge, publish,\ndistribute, sublicense, and/or sell copies of the Software, and to\npermit persons to whom the Software is furnished to do so, subject to\nthe following conditions:\n\nThe above copyright notice and this permission notice shall be\nincluded in all copies or substantial portions of the Software.\n\nTHE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND,\nEXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\nMERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND\nNONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE\nLIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION\nOF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION\nWITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.\n*/\n\n// A simple 2-dimensional vector implementation\n\nmodule.exports = Vec2\n\nfunction Vec2(x, y) {\n\tthis.x = x || 0;\n\tthis.y = y || 0;\n}\n\nVec2.prototype.add = function(v) {\n\treturn new Vec2(this.x + v.x, this.y + v.y);\n}\n\nVec2.prototype.sub = function(v) {\n\treturn new Vec2(this.x - v.x, this.y - v.y);\n}\n\nVec2.prototype.mul = function(v) {\n\treturn new Vec2(this.x * v.x, this.y * v.y);\n}\n\nVec2.prototype.div = function(v) {\n\treturn new Vec2(this.x / v.x, this.y / v.y);\n}\n\nVec2.prototype.scale = function(coef) {\n\treturn new Vec2(this.x*coef, this.y*coef);\n}\n\nVec2.prototype.mutableSet = function(v) {\n\tthis.x = v.x;\n\tthis.y = v.y;\n\treturn this;\n}\n\nVec2.prototype.mutableAdd = function(v) {\n\tthis.x += v.x;\n\tthis.y += v.y;\n\treturn this;\n}\n\nVec2.prototype.mutableSub = function(v) {\n\tthis.x -= v.x;\n\tthis.y -= v.y;\n\treturn this;\n}\n\nVec2.prototype.mutableMul = function(v) {\n\tthis.x *= v.x;\n\tthis.y *= v.y;\n\treturn this;\n}\n\nVec2.prototype.mutableDiv = function(v) {\n\tthis.x /= v.x;\n\tthis.y /= v.y;\n\treturn this;\n}\n\nVec2.prototype.mutableScale = function(coef) {\n\tthis.x *= coef;\n\tthis.y *= coef;\n\treturn this;\n}\n\nVec2.prototype.equals = function(v) {\n\treturn this.x == v.x && this.y == v.y;\n}\n\nVec2.prototype.epsilonEquals = function(v, epsilon) {\n\treturn Math.abs(this.x - v.x) <= epsilon && Math.abs(this.y - v.y) <= epsilon;\n}\n\nVec2.prototype.length = function(v) {\n\treturn Math.sqrt(this.x*this.x + this.y*this.y);\n}\n\nVec2.prototype.length2 = function(v) {\n\treturn this.x*this.x + this.y*this.y;\n}\n\nVec2.prototype.dist = function(v) {\n\treturn Math.sqrt(this.dist2(v));\n}\n\nVec2.prototype.dist2 = function(v) {\n\tvar x = v.x - this.x;\n\tvar y = v.y - this.y;\n\treturn x*x + y*y;\n}\n\nVec2.prototype.normal = function() {\n\tvar m = Math.sqrt(this.x*this.x + this.y*this.y);\n\treturn new Vec2(this.x/m, this.y/m);\n}\n\nVec2.prototype.dot = function(v) {\n\treturn this.x*v.x + this.y*v.y;\n}\n\nVec2.prototype.angle = function(v) {\n\treturn Math.atan2(this.x*v.y-this.y*v.x,this.x*v.x+this.y*v.y);\n}\n\nVec2.prototype.angle2 = function(vLeft, vRight) {\n\treturn vLeft.sub(this).angle(vRight.sub(this));\n}\n\nVec2.prototype.rotate = function(origin, theta) {\n\tvar x = this.x - origin.x;\n\tvar y = this.y - origin.y;\n\treturn new Vec2(x*Math.cos(theta) - y*Math.sin(theta) + origin.x, x*Math.sin(theta) + y*Math.cos(theta) + origin.y);\n}\n\nVec2.prototype.toString = function() {\n\treturn \"(\" + this.x + \", \" + this.y + \")\";\n}\n\nfunction test_Vec2() {\n\tvar assert = function(label, expression) {\n\t\tconsole.log(\"Vec2(\" + label + \"): \" + (expression == true ? \"PASS\" : \"FAIL\"));\n\t\tif (expression != true)\n\t\t\tthrow \"assertion failed\";\n\t};\n\t\n\tassert(\"equality\", (new Vec2(5,3).equals(new Vec2(5,3))));\n\tassert(\"epsilon equality\", (new Vec2(1,2).epsilonEquals(new Vec2(1.01,2.02), 0.03)));\n\tassert(\"epsilon non-equality\", !(new Vec2(1,2).epsilonEquals(new Vec2(1.01,2.02), 0.01)));\n\tassert(\"addition\", (new Vec2(1,1)).add(new Vec2(2, 3)).equals(new Vec2(3, 4)));\n\tassert(\"subtraction\", (new Vec2(4,3)).sub(new Vec2(2, 1)).equals(new Vec2(2, 2)));\n\tassert(\"multiply\", (new Vec2(2,4)).mul(new Vec2(2, 1)).equals(new Vec2(4, 4)));\n\tassert(\"divide\", (new Vec2(4,2)).div(new Vec2(2, 2)).equals(new Vec2(2, 1)));\n\tassert(\"scale\", (new Vec2(4,3)).scale(2).equals(new Vec2(8, 6)));\n\tassert(\"mutable set\", (new Vec2(1,1)).mutableSet(new Vec2(2, 3)).equals(new Vec2(2, 3)));\n\tassert(\"mutable addition\", (new Vec2(1,1)).mutableAdd(new Vec2(2, 3)).equals(new Vec2(3, 4)));\n\tassert(\"mutable subtraction\", (new Vec2(4,3)).mutableSub(new Vec2(2, 1)).equals(new Vec2(2, 2)));\n\tassert(\"mutable multiply\", (new Vec2(2,4)).mutableMul(new Vec2(2, 1)).equals(new Vec2(4, 4)));\n\tassert(\"mutable divide\", (new Vec2(4,2)).mutableDiv(new Vec2(2, 2)).equals(new Vec2(2, 1)));\n\tassert(\"mutable scale\", (new Vec2(4,3)).mutableScale(2).equals(new Vec2(8, 6)));\n\tassert(\"length\", Math.abs((new Vec2(4,4)).length() - 5.65685) <= 0.00001);\n\tassert(\"length2\", (new Vec2(2,4)).length2() == 20);\n\tassert(\"dist\", Math.abs((new Vec2(2,4)).dist(new Vec2(3,5)) - 1.4142135) <= 0.000001);\n\tassert(\"dist2\", (new Vec2(2,4)).dist2(new Vec2(3,5)) == 2);\n\n\tvar normal = (new Vec2(2,4)).normal()\n\tassert(\"normal\", Math.abs(normal.length() - 1.0) <= 0.00001 && normal.epsilonEquals(new Vec2(0.4472, 0.89443), 0.0001));\n\tassert(\"dot\", (new Vec2(2,3)).dot(new Vec2(4,1)) == 11);\n\tassert(\"angle\", (new Vec2(0,-1)).angle(new Vec2(1,0))*(180/Math.PI) == 90);\n\tassert(\"angle2\", (new Vec2(1,1)).angle2(new Vec2(1,0), new Vec2(2,1))*(180/Math.PI) == 90);\n\tassert(\"rotate\", (new Vec2(2,0)).rotate(new Vec2(1,0), Math.PI/2).equals(new Vec2(1,1)));\n\tassert(\"toString\", (new Vec2(2,4)) == \"(2, 4)\");\n}\n\n","\n/*\nCopyright 2013 Sub Protocol and other contributors\nhttp://subprotocol.com/\n\nPermission is hereby granted, free of charge, to any person obtaining\na copy of this software and associated documentation files (the\n\"Software\"), to deal in the Software without restriction, including\nwithout limitation the rights to use, copy, modify, merge, publish,\ndistribute, sublicense, and/or sell copies of the Software, and to\npermit persons to whom the Software is furnished to do so, subject to\nthe following conditions:\n\nThe above copyright notice and this permission notice shall be\nincluded in all copies or substantial portions of the Software.\n\nTHE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND,\nEXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\nMERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND\nNONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE\nLIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION\nOF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION\nWITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.\n*/\n\n// generic verlet entities\n\nvar VerletJS = require('./verlet')\nvar Particle = VerletJS.Particle\nvar constraints = require('./constraint')\nvar DistanceConstraint = constraints.DistanceConstraint\n\nVerletJS.prototype.point = function(pos) {\n\tvar composite = new this.Composite();\n\tcomposite.particles.push(new Particle(pos));\n\tthis.composites.push(composite);\n\treturn composite;\n}\n\nVerletJS.prototype.lineSegments = function(vertices, stiffness) {\n\tvar i;\n\t\n\tvar composite = new this.Composite();\n\t\n\tfor (i in vertices) {\n\t\tcomposite.particles.push(new Particle(vertices[i]));\n\t\tif (i > 0)\n\t\t\tcomposite.constraints.push(new DistanceConstraint(composite.particles[i], composite.particles[i-1], stiffness));\n\t}\n\t\n\tthis.composites.push(composite);\n\treturn composite;\n}\n\nVerletJS.prototype.cloth = function(origin, width, height, segments, pinMod, stiffness) {\n\t\n\tvar composite = new this.Composite();\n\t\n\tvar xStride = width/segments;\n\tvar yStride = height/segments;\n\t\n\tvar x,y;\n\tfor (y=0;y<segments;++y) {\n\t\tfor (x=0;x<segments;++x) {\n\t\t\tvar px = origin.x + x*xStride - width/2 + xStride/2;\n\t\t\tvar py = origin.y + y*yStride - height/2 + yStride/2;\n\t\t\tcomposite.particles.push(new Particle(new Vec2(px, py)));\n\t\t\t\n\t\t\tif (x > 0)\n\t\t\t\tcomposite.constraints.push(new DistanceConstraint(composite.particles[y*segments+x], composite.particles[y*segments+x-1], stiffness));\n\t\t\t\n\t\t\tif (y > 0)\n\t\t\t\tcomposite.constraints.push(new DistanceConstraint(composite.particles[y*segments+x], composite.particles[(y-1)*segments+x], stiffness));\n\t\t}\n\t}\n\t\n\tfor (x=0;x<segments;++x) {\n\t\tif (x%pinMod == 0)\n\t\tcomposite.pin(x);\n\t}\n\t\n\tthis.composites.push(composite);\n\treturn composite;\n}\n\nVerletJS.prototype.tire = function(origin, radius, segments, spokeStiffness, treadStiffness) {\n\tvar stride = (2*Math.PI)/segments;\n\tvar i;\n\t\n\tvar composite = new this.Composite();\n\t\n\t// particles\n\tfor (i=0;i<segments;++i) {\n\t\tvar theta = i*stride;\n\t\tcomposite.particles.push(new Particle(new Vec2(origin.x + Math.cos(theta)*radius, origin.y + Math.sin(theta)*radius)));\n\t}\n\t\n\tvar center = new Particle(origin);\n\tcomposite.particles.push(center);\n\t\n\t// constraints\n\tfor (i=0;i<segments;++i) {\n\t\tcomposite.constraints.push(new DistanceConstraint(composite.particles[i], composite.particles[(i+1)%segments], treadStiffness));\n\t\tcomposite.constraints.push(new DistanceConstraint(composite.particles[i], center, spokeStiffness))\n\t\tcomposite.constraints.push(new DistanceConstraint(composite.particles[i], composite.particles[(i+5)%segments], treadStiffness));\n\t}\n\t\t\n\tthis.composites.push(composite);\n\treturn composite;\n}\n\n","\n/*\nCopyright 2013 Sub Protocol and other contributors\nhttp://subprotocol.com/\n\nPermission is hereby granted, free of charge, to any person obtaining\na copy of this software and associated documentation files (the\n\"Software\"), to deal in the Software without restriction, including\nwithout limitation the rights to use, copy, modify, merge, publish,\ndistribute, sublicense, and/or sell copies of the Software, and to\npermit persons to whom the Software is furnished to do so, subject to\nthe following conditions:\n\nThe above copyright notice and this permission notice shall be\nincluded in all copies or substantial portions of the Software.\n\nTHE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND,\nEXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\nMERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND\nNONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE\nLIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION\nOF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION\nWITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.\n*/\n\nwindow.requestAnimFrame = window.requestAnimationFrame\n|| window.webkitRequestAnimationFrame\n|| window.mozRequestAnimationFrame\n|| window.oRequestAnimationFrame\n|| window.msRequestAnimationFrame\n|| function(callback) {\n\twindow.setTimeout(callback, 1000 / 60);\n};\n\nvar Vec2 = require('./vec2')\n\nexports = module.exports = VerletJS\nexports.Particle = Particle\nexports.Composite = Composite\n\nfunction Particle(pos) {\n\tthis.pos = (new Vec2()).mutableSet(pos);\n\tthis.lastPos = (new Vec2()).mutableSet(pos);\n}\n\nParticle.prototype.draw = function(ctx) {\n\tctx.beginPath();\n\tctx.arc(this.pos.x, this.pos.y, 2, 0, 2*Math.PI);\n\tctx.fillStyle = \"#2dad8f\";\n\tctx.fill();\n}\n\nfunction VerletJS(width, height, canvas) {\n\tthis.width = width;\n\tthis.height = height;\n\tthis.canvas = canvas;\n\tthis.ctx = canvas.getContext(\"2d\");\n\tthis.mouse = new Vec2(0,0);\n\tthis.mouseDown = false;\n\tthis.draggedEntity = null;\n\tthis.selectionRadius = 20;\n\tthis.highlightColor = \"#4f545c\";\n\t\n\tthis.bounds = function (particle) {\n\t\tif (particle.pos.y > this.height-1)\n\t\t\tparticle.pos.y = this.height-1;\n\t\t\n\t\tif (particle.pos.x < 0)\n\t\t\tparticle.pos.x = 0;\n\n\t\tif (particle.pos.x > this.width-1)\n\t\t\tparticle.pos.x = this.width-1;\n\t}\n\t\n\tvar _this = this;\n\t\n\t// prevent context menu\n\tthis.canvas.oncontextmenu = function(e) {\n\t\te.preventDefault();\n\t};\n\t\n\tthis.canvas.onmousedown = function(e) {\n\t\t_this.mouseDown = true;\n\t\tvar nearest = _this.nearestEntity();\n\t\tif (nearest) {\n\t\t\t_this.draggedEntity = nearest;\n\t\t}\n\t};\n\t\n\tthis.canvas.onmouseup = function(e) {\n\t\t_this.mouseDown = false;\n\t\t_this.draggedEntity = null;\n\t};\n\t\n\tthis.canvas.onmousemove = function(e) {\n\t\tvar rect = _this.canvas.getBoundingClientRect();\n\t\t_this.mouse.x = e.clientX - rect.left;\n\t\t_this.mouse.y = e.clientY - rect.top;\n\t};  \n\t\n\t// simulation params\n\tthis.gravity = new Vec2(0,0.2);\n\tthis.friction = 0.99;\n\tthis.groundFriction = 0.8;\n\t\n\t// holds composite entities\n\tthis.composites = [];\n}\n\nVerletJS.prototype.Composite = Composite\n\nfunction Composite() {\n\tthis.particles = [];\n\tthis.constraints = [];\n\t\n\tthis.drawParticles = null;\n\tthis.drawConstraints = null;\n}\n\nComposite.prototype.pin = function(index, pos) {\n\tpos = pos || this.particles[index].pos;\n\tvar pc = new PinConstraint(this.particles[index], pos);\n\tthis.constraints.push(pc);\n\treturn pc;\n}\n\nVerletJS.prototype.frame = function(step) {\n\tvar i, j, c;\n\n\tfor (c in this.composites) {\n\t\tfor (i in this.composites[c].particles) {\n\t\t\tvar particles = this.composites[c].particles;\n\t\t\t\n\t\t\t// calculate velocity\n\t\t\tvar velocity = particles[i].pos.sub(particles[i].lastPos).scale(this.friction);\n\t\t\n\t\t\t// ground friction\n\t\t\tif (particles[i].pos.y >= this.height-1 && velocity.length2() > 0.000001) {\n\t\t\t\tvar m = velocity.length();\n\t\t\t\tvelocity.x /= m;\n\t\t\t\tvelocity.y /= m;\n\t\t\t\tvelocity.mutableScale(m*this.groundFriction);\n\t\t\t}\n\t\t\n\t\t\t// save last good state\n\t\t\tparticles[i].lastPos.mutableSet(particles[i].pos);\n\t\t\n\t\t\t// gravity\n\t\t\tparticles[i].pos.mutableAdd(this.gravity);\n\t\t\n\t\t\t// inertia  \n\t\t\tparticles[i].pos.mutableAdd(velocity);\n\t\t}\n\t}\n\t\n\t// handle dragging of entities\n\tif (this.draggedEntity)\n\t\tthis.draggedEntity.pos.mutableSet(this.mouse);\n\t\t\n\t// relax\n\tvar stepCoef = 1/step;\n\tfor (c in this.composites) {\n\t\tvar constraints = this.composites[c].constraints;\n\t\tfor (i=0;i<step;++i)\n\t\t\tfor (j in constraints)\n\t\t\t\tconstraints[j].relax(stepCoef);\n\t}\n\t\n\t// bounds checking\n\tfor (c in this.composites) {\n\t\tvar particles = this.composites[c].particles;\n\t\tfor (i in particles)\n\t\t\tthis.bounds(particles[i]);\n\t}\n}\n\nVerletJS.prototype.draw = function() {\n\tvar i, c;\n\t\n\tthis.ctx.clearRect(0, 0, this.canvas.width, this.canvas.height);  \n\t\n\tfor (c in this.composites) {\n\t\t// draw constraints\n\t\tif (this.composites[c].drawConstraints) {\n\t\t\tthis.composites[c].drawConstraints(this.ctx, this.composites[c]);\n\t\t} else {\n\t\t\tvar constraints = this.composites[c].constraints;\n\t\t\tfor (i in constraints)\n\t\t\t\tconstraints[i].draw(this.ctx);\n\t\t}\n\t\t\n\t\t// draw particles\n\t\tif (this.composites[c].drawParticles) {\n\t\t\tthis.composites[c].drawParticles(this.ctx, this.composites[c]);\n\t\t} else {\n\t\t\tvar particles = this.composites[c].particles;\n\t\t\tfor (i in particles)\n\t\t\t\tparticles[i].draw(this.ctx);\n\t\t}\n\t}\n\n\t// highlight nearest / dragged entity\n\tvar nearest = this.draggedEntity || this.nearestEntity();\n\tif (nearest) {\n\t\tthis.ctx.beginPath();\n\t\tthis.ctx.arc(nearest.pos.x, nearest.pos.y, 8, 0, 2*Math.PI);\n\t\tthis.ctx.strokeStyle = this.highlightColor;\n\t\tthis.ctx.stroke();\n\t}\n}\n\nVerletJS.prototype.nearestEntity = function() {\n\tvar c, i;\n\tvar d2Nearest = 0;\n\tvar entity = null;\n\tvar constraintsNearest = null;\n\t\n\t// find nearest point\n\tfor (c in this.composites) {\n\t\tvar particles = this.composites[c].particles;\n\t\tfor (i in particles) {\n\t\t\tvar d2 = particles[i].pos.dist2(this.mouse);\n\t\t\tif (d2 <= this.selectionRadius*this.selectionRadius && (entity == null || d2 < d2Nearest)) {\n\t\t\t\tentity = particles[i];\n\t\t\t\tconstraintsNearest = this.composites[c].constraints;\n\t\t\t\td2Nearest = d2;\n\t\t\t}\n\t\t}\n\t}\n\t\n\t// search for pinned constraints for this entity\n\tfor (i in constraintsNearest)\n\t\tif (constraintsNearest[i] instanceof PinConstraint && constraintsNearest[i].a == entity)\n\t\t\tentity = constraintsNearest[i];\n\t\n\treturn entity;\n}\n\n"]}
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