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‎LICENSE

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Copyright 2013 Sub Protocol and other contributors
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http://subprotocol.com/
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

‎experiments/01-shapes.html

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<script type="text/javascript" src="../js/common/vec2.js"></script>
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<script type="text/javascript" src="../js/common/constraint.js"></script>
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<script type="text/javascript" src="../js/common/verlet.js"></script>
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<script type="text/javascript" src="../js/common/objects.js"></script>
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</head>
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<body>
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<canvas id="scratch" style="width: 500px; height: 300px;"></canvas>

‎experiments/02-angle.html

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<script type="text/javascript" src="../js/common/vec2.js"></script>
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<script type="text/javascript" src="../js/common/constraint.js"></script>
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<script type="text/javascript" src="../js/common/verlet.js"></script>
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<script type="text/javascript" src="../js/common/objects.js"></script>
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</head>
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<body>
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<canvas id="scratch" style="width: 800px; height: 500px;"></canvas>

‎experiments/03-cloth.html

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<script type="text/javascript" src="../js/common/vec2.js"></script>
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<script type="text/javascript" src="../js/common/constraint.js"></script>
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<script type="text/javascript" src="../js/common/verlet.js"></script>
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<script type="text/javascript" src="../js/common/objects.js"></script>
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</head>
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<body>
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<canvas id="scratch" style="width: 800px; height: 500px; background: #000;"></canvas>

‎experiments/04-spiderweb.html

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<script type="text/javascript" src="../js/common/vec2.js"></script>
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<script type="text/javascript" src="../js/common/constraint.js"></script>
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<script type="text/javascript" src="../js/common/verlet.js"></script>
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<script type="text/javascript" src="../js/common/objects.js"></script>
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</head>
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<body>
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<canvas id="scratch" style="width: 800px; height: 500px;"></canvas>

‎js/common/constraint.js

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/*
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Copyright 2013 Sub Protocol and other contributors
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http://subprotocol.com/
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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// DistanceConstraint -- constrains to initial distance
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// PinConstraint -- constrains to static/fixed point
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// AngleConstraint -- constrains 3 particles to an angle

‎js/common/objects.js

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/*
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Copyright 2013 Sub Protocol and other contributors
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http://subprotocol.com/
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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// generic verlet entities
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VerletJS.prototype.lineSegments = function(vertices, stiffness) {
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var i;
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var composite = new this.Composite();
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for (i in vertices) {
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composite.particles.push(new Particle(vertices[i]));
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if (i > 0)
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composite.constraints.push(new DistanceConstraint(composite.particles[i], composite.particles[i-1], stiffness));
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}
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this.composites.push(composite);
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return composite;
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}
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VerletJS.prototype.cloth = function(origin, width, height, segments, pinMod, stiffness) {
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var composite = new this.Composite();
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var xStride = width/segments;
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var yStride = height/segments;
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var x,y;
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for (y=0;y<segments;++y) {
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for (x=0;x<segments;++x) {
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var px = origin.x + x*xStride - width/2 + xStride/2;
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var py = origin.y + y*yStride - height/2 + yStride/2;
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composite.particles.push(new Particle(new Vec2(px, py)));
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if (x > 0)
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composite.constraints.push(new DistanceConstraint(composite.particles[y*segments+x], composite.particles[y*segments+x-1], stiffness));
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if (y > 0)
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composite.constraints.push(new DistanceConstraint(composite.particles[y*segments+x], composite.particles[(y-1)*segments+x], stiffness));
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}
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}
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for (x=0;x<segments;++x) {
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if (x%pinMod == 0)
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composite.pin(x);
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}
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this.composites.push(composite);
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return composite;
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}
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VerletJS.prototype.tire = function(origin, radius, segments, spokeStiffness, treadStiffness) {
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var stride = (2*Math.PI)/segments;
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var i;
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var composite = new this.Composite();
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// particles
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for (i=0;i<segments;++i) {
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var theta = i*stride;
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composite.particles.push(new Particle(new Vec2(origin.x + Math.cos(theta)*radius, origin.y + Math.sin(theta)*radius)));
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}
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var center = new Particle(origin);
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composite.particles.push(center);
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// constraints
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for (i=0;i<segments;++i) {
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composite.constraints.push(new DistanceConstraint(composite.particles[i], composite.particles[(i+1)%segments], treadStiffness));
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composite.constraints.push(new DistanceConstraint(composite.particles[i], center, spokeStiffness))
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composite.constraints.push(new DistanceConstraint(composite.particles[i], composite.particles[(i+5)%segments], treadStiffness));
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}
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this.composites.push(composite);
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return composite;
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}
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‎js/common/vec2.js

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// 2-dimensional vector implementation
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/*
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Copyright 2013 Sub Protocol and other contributors
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http://subprotocol.com/
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
11+
permit persons to whom the Software is furnished to do so, subject to
12+
the following conditions:
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The above copyright notice and this permission notice shall be
15+
included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19+
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
21+
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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// A simple 2-dimensional vector implementation
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function Vec2(x, y) {
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this.x = x || 0;

‎js/common/verlet.js

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/*
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Copyright 2013 Sub Protocol and other contributors
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http://subprotocol.com/
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
8+
"Software"), to deal in the Software without restriction, including
9+
without limitation the rights to use, copy, modify, merge, publish,
10+
distribute, sublicense, and/or sell copies of the Software, and to
11+
permit persons to whom the Software is furnished to do so, subject to
12+
the following conditions:
13+
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The above copyright notice and this permission notice shall be
15+
included in all copies or substantial portions of the Software.
16+
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18+
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19+
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
20+
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
21+
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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window.requestAnimFrame = window.requestAnimationFrame
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|| window.webkitRequestAnimationFrame
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return composite;
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}
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VerletJS.prototype.lineSegments = function(vertices, stiffness) {
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var i;
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var composite = new this.Composite();
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for (i in vertices) {
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composite.particles.push(new Particle(vertices[i]));
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if (i > 0)
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composite.constraints.push(new DistanceConstraint(composite.particles[i], composite.particles[i-1], stiffness));
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}
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this.composites.push(composite);
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return composite;
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}
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VerletJS.prototype.cloth = function(origin, width, height, segments, pinMod, stiffness) {
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var composite = new this.Composite();
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var xStride = width/segments;
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var yStride = height/segments;
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var x,y;
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for (y=0;y<segments;++y) {
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for (x=0;x<segments;++x) {
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var px = origin.x + x*xStride - width/2 + xStride/2;
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var py = origin.y + y*yStride - height/2 + yStride/2;
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composite.particles.push(new Particle(new Vec2(px, py)));
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if (x > 0)
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composite.constraints.push(new DistanceConstraint(composite.particles[y*segments+x], composite.particles[y*segments+x-1], stiffness));
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if (y > 0)
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composite.constraints.push(new DistanceConstraint(composite.particles[y*segments+x], composite.particles[(y-1)*segments+x], stiffness));
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}
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}
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for (x=0;x<segments;++x) {
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if (x%pinMod == 0)
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composite.pin(x);
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}
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this.composites.push(composite);
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return composite;
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}
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VerletJS.prototype.tire = function(origin, radius, segments, spokeStiffness, treadStiffness) {
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var stride = (2*Math.PI)/segments;
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var i;
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var composite = new this.Composite();
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// particles
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for (i=0;i<segments;++i) {
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var theta = i*stride;
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composite.particles.push(new Particle(new Vec2(origin.x + Math.cos(theta)*radius, origin.y + Math.sin(theta)*radius)));
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}
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var center = new Particle(origin);
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composite.particles.push(center);
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// constraints
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for (i=0;i<segments;++i) {
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composite.constraints.push(new DistanceConstraint(composite.particles[i], composite.particles[(i+1)%segments], treadStiffness));
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composite.constraints.push(new DistanceConstraint(composite.particles[i], center, spokeStiffness))
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composite.constraints.push(new DistanceConstraint(composite.particles[i], composite.particles[(i+5)%segments], treadStiffness));
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}
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this.composites.push(composite);
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return composite;
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}
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VerletJS.prototype.frame = function(step) {
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var i, j, c;
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