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/* |
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Script: Floating Hearts using Canvas and native JS |
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Author: Abhinav Rastogi |
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Date: Feb 14, 2013 |
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Sample Usage: |
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floatingLove({ |
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'minSpeed': 1.5, //Minimum vertical speed |
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'maxSpeed': 2, //Maximum vertical speed |
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'minAmplitude': 0.5, //Minimum amplitude (>0) |
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'maxAmplitude': 1.5, //Maximum amplitude (>0) |
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'minFrequency': 0.08, //Maximum Frequency (>0) |
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'maxFrequency': 0.1, //Maximum Frequency (>0) |
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'minAlpha': 0.7, //Minimum opacity (0-1) |
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'maxAlpha': 0.8, //Maximum opacity (0-1) |
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'minScale': 0.2, //Minimum size multiplier (0-1) |
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'maxScale': 0.8, //Maximum size multiplier (0-1) |
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'interval': 1000, //Time gap between each heart |
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'delay': 1000 //Starting delay from initialization |
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}).init(); |
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*/ |
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var floatingLove = function(settings) { |
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var canvas, context; |
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var res_heart, body; |
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var pool = new Array(); |
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var arr_hearts = new Array(); |
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window.requestAnimFrame = (function(callback) { |
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return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame || |
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function(callback) { |
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window.setTimeout(callback, 1000/60); |
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}; |
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})(); |
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var generateRandomHeart = function() { |
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var obj_heart; |
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if(pool.length>0) { |
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obj_heart=pool.pop(); |
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} else { |
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obj_heart={}; |
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obj_heart.image=res_heart; |
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} |
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obj_heart.x = (window.innerWidth-100)*Math.random(); |
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obj_heart.y = window.innerHeight; |
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obj_heart.speed = settings.minSpeed + (settings.maxSpeed-settings.minSpeed)*Math.random(); |
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obj_heart.amplitude = settings.minAmplitude + (settings.maxAmplitude - settings.minAmplitude) * Math.random(); |
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obj_heart.frequency = settings.minFrequency + (settings.maxFrequency - settings.minFrequency) * Math.random(); |
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obj_heart.alpha = settings.minAlpha + (settings.maxAlpha - settings.minAlpha)*Math.random(); |
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obj_heart.size = (res_heart.height * settings.minScale) + (res_heart.height*(settings.maxScale - settings.minScale)) * Math.random(); |
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obj_heart.width = res_heart.width; |
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obj_heart.height = res_heart.height; |
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arr_hearts.push(obj_heart); |
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setTimeout(generateRandomHeart, settings.interval); |
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}; |
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var animate = function() { |
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requestAnimFrame(function() { |
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animate(); |
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}); |
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context.clearRect(0,0,canvas.width,canvas.height); |
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var heart; |
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for(var i=0; i<arr_hearts.length; i++) { |
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heart = arr_hearts[i]; |
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context.globalAlpha = heart.alpha; |
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context.drawImage(heart.image, heart.x, heart.y, heart.size, heart.size * heart.height/heart.width); |
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heart.y-=heart.speed; |
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heart.x = heart.x + heart.amplitude*Math.sin(heart.y*heart.frequency); |
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} |
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for(var i=0; i<arr_hearts.length; i++) { |
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if(arr_hearts[i].y<-100) { |
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pool.push(arr_hearts.splice(i,1)[0]); |
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break; |
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} |
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} |
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}; |
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var init = function() { |
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canvas = document.createElement('canvas'); |
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canvas.height = window.innerHeight || html.clientHeight; |
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canvas.width = window.innerWidth || html.clientWidth; |
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var canvasStyle = canvas.style; |
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canvasStyle.position = 'fixed'; |
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canvasStyle.top = 0; |
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canvasStyle.left = 0; |
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canvasStyle.zIndex = 1138; |
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canvasStyle['pointerEvents'] = 'none'; |
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body = document.getElementsByTagName('body')[0]; |
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body.appendChild(canvas); |
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res_heart = new Image(); |
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res_heart.onload = function() { |
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animate(); |
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}; |
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res_heart.src="/static/3rdbdayballoon2_75.png"; |
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setTimeout(generateRandomHeart, settings.delay); |
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context = canvas.getContext('2d'); |
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}; |
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return ({ |
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'init': init |
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}); |
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}; |