Created
August 11, 2011 14:01
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Paper.js Non-Flocking Tadpoles
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> | |
| <title>Tadpoles</title> | |
| <script type="text/javascript" src="http://paperjs.org/static/js/paper.js"></script> | |
| <script type="text/javascript" canvas="canvas"> | |
| paper.install(window); | |
| window.onload = function() { | |
| paper.setup('canvas'); | |
| project.currentStyle = { | |
| strokeColor: 'white', | |
| strokeWidth: 2, | |
| strokeCap: 'round' | |
| }; | |
| var n = 100, | |
| m = 12; | |
| var head = new Path.Oval([0, 0], [13, 8]); | |
| head.fillColor = 'white'; | |
| head.strokeColor = null; | |
| var headSymbol = new Symbol(head); | |
| var Boid = Base.extend({ | |
| initialize: function(position) { | |
| this.vel = Point.random().multiply(2).subtract(1); | |
| this.loc = position; | |
| this.head = headSymbol.place(); | |
| this.path = new Path(); | |
| this.shortPath = new Path(); | |
| this.shortPath.strokeWidth = 4; | |
| for (var i = 0; i < m; i++) | |
| this.path.add(this.loc); | |
| this.count = 0; | |
| }, | |
| run: function() { | |
| var segments = this.path.segments, | |
| dx = this.vel.x, | |
| dy = this.vel.y, | |
| x = this.loc.x += dx, | |
| y = this.loc.y += dy, | |
| speed = this.vel.length, | |
| count = speed * 10, | |
| k1 = -5 - speed / 3; | |
| // Bounce off the walls. | |
| if (x < 0 || x > view.size.width) this.vel.x *= -1; | |
| if (y < 0 || y > view.size.height) this.vel.y *= -1; | |
| for (var i = 0, l = segments.length; i < l; i++) { | |
| var point = segments[i].point, | |
| vx = x - point.x, | |
| vy = y - point.y, | |
| k2 = Math.sin(((this.count += count) + i * 3) / 300) / speed; | |
| point.x = (x += dx / speed * k1) - dy * k2; | |
| point.y = (y += dy / speed * k1) + dx * k2; | |
| speed = Math.sqrt((dx = vx) * dx + (dy = vy) * dy); | |
| } | |
| this.shortPath.segments = segments.slice(0, 3); | |
| // TODO: Fix this bug | |
| delete this.vel._angle; | |
| this.head.matrix = new Matrix().translate(this.loc).rotate(this.vel.angle); | |
| } | |
| }); | |
| var boids = []; | |
| for (var i = 0; i < n; i++) { | |
| boids.push(new Boid(Point.random().multiply(view.size))); | |
| } | |
| view.onFrame = function(event) { | |
| for (var i = 0, l = boids.length; i < l; i++) { | |
| boids[i].run(); | |
| } | |
| } | |
| } | |
| </script> | |
| <style> | |
| body { | |
| background: black; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <canvas id="canvas" width="960" height="500"></canvas> | |
| </body> | |
| </html> |
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