HTML5鼠标点击页面放烟花特效
html代码
<!DOCTYPE html><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>html5鼠标点击页面放烟花特效</title><style>html,body{height:100%;margin:0;padding:0}ul,li{text-indent:0;text-decoration:none;margin:0;padding:0}img{border:0}body{background-color:#000;color:#999;font:100%/18px helvetica, arial, sans-serif}canvas{cursor:crosshair;display:block;left:0;position:absolute;top:0;z-index:20}</style></head><body><script type="text/javascript" src="js/jquery-2.0.0.min.js"></script><script type="text/javascript">$(function(){var Fireworks = function(){var self = this;var rand = function(rMi, rMa){return ~~((Math.random()*(rMa-rMi+1))+rMi);}var hitTest = function(x1, y1, w1, h1, x2, y2, w2, h2){return !(x1 + w1 < x2 || x2 + w2 < x1 || y1 + h1 < y2 || y2 + h2 < y1);};window.requestAnimFrame=function(){return window.requestAnimationFrame||window.webkitRequestAnimationFrame||window.mozRequestAnimationFrame||window.oRequestAnimationFrame||window.msRequestAnimationFrame||function(a){window.setTimeout(a,1E3/60)}}();self.init = function(){self.canvas = document.createElement('canvas'); self.canvas.width = self.cw = $(window).innerWidth();self.canvas.height = self.ch = $(window).innerHeight(); self.particles = []; self.partCount = 150;self.fireworks = []; self.mx = self.cw/2;self.my = self.ch/2;self.currentHue = 30;self.partSpeed = 5;self.partSpeedVariance = 10;self.partWind = 50;self.partFriction = 5;self.partGravity = 1;self.hueMin = 0;self.hueMax = 360;self.fworkSpeed = 4;self.fworkAccel = 10;self.hueVariance = 30;self.flickerDensity = 25;self.showShockwave = true;self.showTarget = false;self.clearAlpha = 25;$(document.body).append(self.canvas);self.ctx = self.canvas.getContext('2d');self.ctx.lineCap = 'round';self.ctx.lineJoin = 'round';self.lineWidth = 1;self.bindEvents();self.canvasLoop();self.canvas.onselectstart = function() {return false;};};self.createParticles = function(x,y, hue){var countdown = self.partCount;while(countdown--){var newParticle = {x: x,y: y,coordLast: [{x: x, y: y},{x: x, y: y},{x: x, y: y}],angle: rand(0, 360),speed: rand(((self.partSpeed - self.partSpeedVariance) <= 0) ? 1 : self.partSpeed - self.partSpeedVariance, (self.partSpeed + self.partSpeedVariance)),friction: 1 - self.partFriction/100,gravity: self.partGravity/2,hue: rand(hue-self.hueVariance, hue+self.hueVariance),brightness: rand(50, 80),alpha: rand(40,100)/100,decay: rand(10, 50)/1000,wind: (rand(0, self.partWind) - (self.partWind/2))/25,lineWidth: self.lineWidth}; self.particles.push(newParticle);}};self.updateParticles = function(){var i = self.particles.length;while(i--){var p = self.particles[i];var radians = p.angle * Math.PI / 180;var vx = Math.cos(radians) * p.speed;var vy = Math.sin(radians) * p.speed;p.speed *= p.friction;p.coordLast[2].x = p.coordLast[1].x;p.coordLast[2].y = p.coordLast[1].y;p.coordLast[1].x = p.coordLast[0].x;p.coordLast[1].y = p.coordLast[0].y;p.coordLast[0].x = p.x;p.coordLast[0].y = p.y;p.x += vx;p.y += vy;p.y += p.gravity;p.angle += p.wind; p.alpha -= p.decay;if(!hitTest(0,0,self.cw,self.ch,p.x-p.radius, p.y-p.radius, p.radius*2, p.radius*2) || p.alpha < .05){self.particles.splice(i, 1); }};};self.drawParticles = function(){var i = self.particles.length;while(i--){var p = self.particles[i];var coordRand = (rand(1,3)-1);self.ctx.beginPath(); self.ctx.moveTo(Math.round(p.coordLast[coordRand].x), Math.round(p.coordLast[coordRand].y));self.ctx.lineTo(Math.round(p.x), Math.round(p.y));self.ctx.closePath();self.ctx.strokeStyle = 'hsla('+p.hue+', 100%, '+p.brightness+'%, '+p.alpha+')';self.ctx.stroke(); if(self.flickerDensity > 0){var inverseDensity = 50 - self.flickerDensity; if(rand(0, inverseDensity) === inverseDensity){self.ctx.beginPath();self.ctx.arc(Math.round(p.x), Math.round(p.y), rand(p.lineWidth,p.lineWidth+3)/2, 0, Math.PI*2, false)self.ctx.closePath();var randAlpha = rand(50,100)/100;self.ctx.fillStyle = 'hsla('+p.hue+', 100%, '+p.brightness+'%, '+randAlpha+')';self.ctx.fill();} }};};self.createFireworks = function(startX, startY, targetX, targetY){var newFirework = {x: startX,y: startY,startX: startX,startY: startY,hitX: false,hitY: false,coordLast: [{x: startX, y: startY},{x: startX, y: startY},{x: startX, y: startY}],targetX: targetX,targetY: targetY,speed: self.fworkSpeed,angle: Math.atan2(targetY - startY, targetX - startX),shockwaveAngle: Math.atan2(targetY - startY, targetX - startX)+(90*(Math.PI/180)),acceleration: self.fworkAccel/100,hue: self.currentHue,brightness: rand(50, 80),alpha: rand(50,100)/100,lineWidth: self.lineWidth};self.fireworks.push(newFirework);};self.updateFireworks = function(){var i = self.fireworks.length;while(i--){var f = self.fireworks[i];self.ctx.lineWidth = f.lineWidth;vx = Math.cos(f.angle) * f.speed,vy = Math.sin(f.angle) * f.speed;f.speed *= 1 + f.acceleration; f.coordLast[2].x = f.coordLast[1].x;f.coordLast[2].y = f.coordLast[1].y;f.coordLast[1].x = f.coordLast[0].x;f.coordLast[1].y = f.coordLast[0].y;f.coordLast[0].x = f.x;f.coordLast[0].y = f.y;if(f.startX >= f.targetX){if(f.x + vx <= f.targetX){f.x = f.targetX;f.hitX = true;} else {f.x += vx;}} else {if(f.x + vx >= f.targetX){f.x = f.targetX;f.hitX = true;} else {f.x += vx;}}if(f.startY >= f.targetY){if(f.y + vy <= f.targetY){f.y = f.targetY;f.hitY = true;} else {f.y += vy;}} else {if(f.y + vy >= f.targetY){f.y = f.targetY;f.hitY = true;} else {f.y += vy;}}if(f.hitX && f.hitY){self.createParticles(f.targetX, f.targetY, f.hue);self.fireworks.splice(i, 1);}};};self.drawFireworks = function(){var i = self.fireworks.length;self.ctx.globalCompositeOperation = 'lighter';while(i--){var f = self.fireworks[i];self.ctx.lineWidth = f.lineWidth;var coordRand = (rand(1,3)-1); self.ctx.beginPath(); self.ctx.moveTo(Math.round(f.coordLast[coordRand].x), Math.round(f.coordLast[coordRand].y));self.ctx.lineTo(Math.round(f.x), Math.round(f.y));self.ctx.closePath();self.ctx.strokeStyle = 'hsla('+f.hue+', 100%, '+f.brightness+'%, '+f.alpha+')';self.ctx.stroke(); if(self.showTarget){self.ctx.save();self.ctx.beginPath();self.ctx.arc(Math.round(f.targetX), Math.round(f.targetY), rand(1,8), 0, Math.PI*2, false)self.ctx.closePath();self.ctx.lineWidth = 1;self.ctx.stroke();self.ctx.restore();}if(self.showShockwave){self.ctx.save();self.ctx.translate(Math.round(f.x), Math.round(f.y));self.ctx.rotate(f.shockwaveAngle);self.ctx.beginPath();self.ctx.arc(0, 0, 1*(f.speed/5), 0, Math.PI, true);self.ctx.strokeStyle = 'hsla('+f.hue+', 100%, '+f.brightness+'%, '+rand(25, 60)/100+')';self.ctx.lineWidth = f.lineWidth;self.ctx.stroke();self.ctx.restore();}};};self.bindEvents = function(){$(window).on('resize', function(){clearTimeout(self.timeout);self.timeout = setTimeout(function() {self.canvas.width = self.cw = $(window).innerWidth();self.canvas.height = self.ch = $(window).innerHeight();self.ctx.lineCap = 'round';self.ctx.lineJoin = 'round';}, 100);});$(self.canvas).on('mousedown', function(e){self.mx = e.pageX - self.canvas.offsetLeft;self.my = e.pageY - self.canvas.offsetTop;self.currentHue = rand(self.hueMin, self.hueMax);self.createFireworks(self.cw/2, self.ch, self.mx, self.my); $(self.canvas).on('mousemove.fireworks', function(e){self.mx = e.pageX - self.canvas.offsetLeft;self.my = e.pageY - self.canvas.offsetTop;self.currentHue = rand(self.hueMin, self.hueMax);self.createFireworks(self.cw/2, self.ch, self.mx, self.my); }); });$(self.canvas).on('mouseup', function(e){$(self.canvas).off('mousemove.fireworks'); });}self.clear = function(){self.particles = [];self.fireworks = [];self.ctx.clearRect(0, 0, self.cw, self.ch);};self.canvasLoop = function(){requestAnimFrame(self.canvasLoop, self.canvas); self.ctx.globalCompositeOperation = 'destination-out';self.ctx.fillStyle = 'rgba(0,0,0,'+self.clearAlpha/100+')';self.ctx.fillRect(0,0,self.cw,self.ch);self.updateFireworks();self.updateParticles();self.drawFireworks(); self.drawParticles();};self.init(); }var fworks = new Fireworks();});</script></body></html>
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