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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,174 @@ | ||
| // ---------------------------------------- | ||
| // Particle | ||
| // ---------------------------------------- | ||
|
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| function Particle(x, y, radius) { | ||
| this.init(x, y, radius); | ||
| } | ||
|
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| Particle.prototype = { | ||
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| init: function(x, y, radius) { | ||
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| this.alive = true; | ||
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| this.radius = radius || 10; | ||
| this.wander = 0.15; | ||
| this.theta = random(TWO_PI); | ||
| this.drag = 0.92; | ||
| this.color = '#EEEEEE'; | ||
|
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| this.x = x || 0.0; | ||
| this.y = y || 0.0; | ||
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| this.vx = 0.0; | ||
| this.vy = 0.0; | ||
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| }, | ||
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| move: function() { | ||
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| this.x += this.vx; | ||
| this.y += this.vy; | ||
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| this.vx *= this.drag; | ||
| this.vy *= this.drag; | ||
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| this.theta += random(-0.5, 0.5) * this.wander; | ||
| this.vx += sin(this.theta) * 0.1; | ||
| this.vy += cos(this.theta) * 0.1; | ||
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| this.radius *= 0.96; | ||
| this.alive = this.radius > 0.5; | ||
|
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| }, | ||
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| draw: function(ctx) { | ||
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| ctx.beginPath(); | ||
| ctx.arc(this.x, this.y, this.radius, 0, TWO_PI); | ||
| ctx.fillStyle = this.color; | ||
| ctx.fill(); | ||
|
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| } | ||
|
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| }; | ||
|
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| // ---------------------------------------- | ||
| // Example | ||
| // ---------------------------------------- | ||
|
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| var MAX_PARTICLES = 300; | ||
| var COLOURS = [ | ||
| '#E3F2FD', '#BBDEFB', '#90CAF9', '#64B5F6', '#42A5F5', '#2196F3', '#1E88E5', '#1976D2', '#1565C0', '#0D47A1', // Blue 50->900 | ||
| '#FFF8E1', '#FFECB3', '#FFE082', '#FFD54F', '#FFCA28', '#FFC107', '#FFB300', '#FFA000', '#FF8F00', '#FF6F00' // Amber 50->900 | ||
| ]; | ||
|
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| var particles = []; | ||
| var pool = []; | ||
|
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| if ((typeof window.orientation !== "undefined") || (navigator.userAgent.indexOf('IEMobile') !== -1)) { | ||
|
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| console.info("Sketch particles: detected mobile device"); | ||
|
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| var liveBg = Sketch.create({ | ||
| fullscreen: true, | ||
| autostart: true, | ||
| autoclear: true, | ||
| autopause: false, | ||
| container: document.getElementById('sketch-particles'), | ||
| interval: 1, | ||
| globals: true, | ||
| retina: 'auto', | ||
| type: Sketch.CANVAS | ||
| }); | ||
|
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| } | ||
| else { | ||
|
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| console.info("Sketch particles: detected device other than mobile"); | ||
|
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| var liveBg = Sketch.create({ | ||
| fullscreen: true, | ||
| autostart: true, | ||
| autoclear: true, | ||
| autopause: false, | ||
| container: document.getElementById('sketch-particles'), | ||
| interval: 1, | ||
| globals: true, | ||
| retina: 'auto', | ||
| type: Sketch.CANVAS, | ||
| eventTarget: document.getElementById('sketch-particles') | ||
| }); | ||
|
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| } | ||
|
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| liveBg.spawn = function(x, y) { | ||
|
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| var particle, theta, force; | ||
|
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| if (particles.length >= MAX_PARTICLES) { | ||
| pool.push( particles.shift() ); | ||
| } | ||
|
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| particle = pool.length ? pool.pop() : new Particle(); | ||
| particle.init(x, y, random(5, 40)); | ||
|
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| particle.wander = random(0.5, 2.0); | ||
| particle.color = random(COLOURS); | ||
| particle.drag = random(0.9, 0.99); | ||
|
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| theta = random(TWO_PI); | ||
| force = random(2, 8); | ||
|
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| particle.vx = sin(theta) * force; | ||
| particle.vy = cos(theta) * force; | ||
|
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| particles.push(particle); | ||
|
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| }; | ||
|
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| liveBg.update = function() { | ||
|
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| var i, particle; | ||
|
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| for (i = particles.length - 1; i >= 0; i--) { | ||
|
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| particle = particles[i]; | ||
|
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| if (particle.alive) { | ||
| particle.move(); | ||
| } | ||
| else { | ||
| pool.push(particles.splice( i, 1 )[0]); | ||
| } | ||
|
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| } | ||
|
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| }; | ||
|
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| liveBg.draw = function() { | ||
|
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| liveBg.globalCompositeOperation = 'source-over'; // best options: 'lighter' or 'source-over' | ||
|
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| for (var i = particles.length - 1; i >= 0; i--) { | ||
| particles[i].draw(liveBg); | ||
| } | ||
|
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| }; | ||
|
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| liveBg.mousemove = function() { | ||
|
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| var particle, theta, force, touch, max, i, j, n; | ||
|
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| for (i = 0, n = liveBg.touches.length; i < n; i++) { | ||
|
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| touch = liveBg.touches[i], max = random(1, 4); | ||
|
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| for (j = 0; j < max; j++) { | ||
| liveBg.spawn(touch.x, touch.y); | ||
| } | ||
|
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||
| } | ||
|
|
||
| }; |
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