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Hunter Loftis
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Mar 29, 2011
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,132 @@ | ||
| (function($, ko) { | ||
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| var ns = 'waterRenderer'; | ||
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| function WaterRenderer(canvas, options) { | ||
| var self = this; | ||
|
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| this.settings = { | ||
| spacing: 15, | ||
| scatter: 10, | ||
| fps: 25, | ||
| momentum: 0.05, | ||
| radius: 20, | ||
| spread: 2, | ||
| gravity: 3, | ||
| opacity: 0.02, | ||
| fade: 0.004, | ||
| color: [0,0,0] | ||
| }; | ||
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| $.extend(this.settings, options || {}) | ||
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| this.ctx = canvas.ctx; | ||
| this.position = [null, null]; // [from, to] | ||
| this.dripping = false; | ||
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| this.debug = $('#workboard')[0].getContext('2d'); | ||
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| $(document).bind(ns + '.down', function(event, position) { | ||
| self.position = [{x: position.x, y: position.y}, {x: position.x, y: position.y}]; | ||
| self.startDrip(); | ||
| }); | ||
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| $(document).bind(ns + '.move', function(event, position) { | ||
| self.position.shift(); | ||
| self.position.push({x: position.x, y: position.y}); | ||
| }); | ||
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| $(document).bind(ns + '.up', function(event, position) { | ||
| self.stopDrip(); | ||
| }); | ||
| } | ||
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| WaterRenderer.prototype = { | ||
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| startDrip: function() { | ||
| if (this.dripping) return; | ||
| this.dripping = true; | ||
| var self = this; | ||
|
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| // Update loop | ||
|
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| (function update() { | ||
| if (self.dripping) { | ||
| var dx = self.position[1].x - self.position[0].x, | ||
| dy = self.position[1].y - self.position[0].y, | ||
| dist = Math.sqrt(dx * dx + dy * dy) || 1, | ||
| spacing = self.settings.spacing, | ||
| drops = dist / spacing, | ||
| ratio = spacing / dist; | ||
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| for (var i = 0; i <= drops; i++) { | ||
| var pos = { | ||
| x: self.position[1].x - ratio * dx * i, | ||
| y: self.position[1].y - ratio * dy * i | ||
| }, | ||
| vel = {x: dx, y: dy}; | ||
| new Drop(self.ctx, pos, vel, self.settings); | ||
| } | ||
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| window.setTimeout(update, 1000 / self.settings.fps); | ||
| } | ||
| })(); | ||
| }, | ||
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| stopDrip: function() { | ||
| this.dripping = false; | ||
| } | ||
| } | ||
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| window.WaterRenderer = WaterRenderer; | ||
|
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| // Helper constructors | ||
|
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| function Drop(ctx, position, velocity, settings) { | ||
| var self = this; | ||
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| this.ctx = ctx; | ||
| this.pos = position; | ||
| this.vel = {x: velocity.x * settings.momentum, y: velocity.y * settings.momentum}; | ||
| this.r = settings.radius; | ||
| this.settings = settings; | ||
| this.opacity = settings.opacity; | ||
| this.colorString = 'rgba(' + settings.color.join(',') + ','; | ||
|
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| this.debug = $('#workboard')[0].getContext('2d'); | ||
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| window.setTimeout(function() {self.update();}, 1000 / settings.fps); | ||
| } | ||
|
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| Drop.prototype = { | ||
| update: function() { | ||
| var self = this; | ||
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| this.debug.clearRect(this.pos.x - 3, this.pos.y - 3, 6, 6); | ||
|
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| this.pos.y += this.settings.gravity; | ||
| this.pos.x += this.vel.x; | ||
| this.pos.y += this.vel.y; | ||
| this.r += this.settings.spread; | ||
| this.opacity -= this.settings.fade; | ||
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| if (this.opacity > this.settings.fade) { | ||
|
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| this.ctx.save(); | ||
| this.ctx.translate(this.pos.x, this.pos.y); | ||
| this.ctx.fillStyle = this.colorString + this.opacity + ')'; | ||
| this.ctx.beginPath(); | ||
| this.ctx.arc(0, 0, this.r, 0, 1.8 * Math.PI, false); | ||
| this.ctx.closePath(); | ||
| this.ctx.fill(); | ||
| this.ctx.restore(); | ||
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| this.debug.fillStyle = '#0ff'; | ||
| this.debug.fillRect(this.pos.x - 2, this.pos.y - 2, 4, 4); | ||
|
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| window.setTimeout(function() {self.update();}, 1000 / this.settings.fps); | ||
| } | ||
| } | ||
| } | ||
|
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| })(jQuery, ko); |
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