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107 lines
3.9 KiB
107 lines
3.9 KiB
/*
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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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};
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