HTML5夜景放烟花绽放动画效果
html代码
<!DOCTYPEhtmlPUBLIC"-//W3C//DTD XHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><htmlxmlns="http://www.w3.org/1999/xhtml"xml:lang="en"><head><metahttp-equiv="Content-Type"content="text/html;charset=gb2312"><style>body{margin:0;padding:0;overflow: hidden;}.city{width:100%;position:fixed;bottom: 0px;z-index: 100;}.city img{width: 100%;}</style><title>html5夜景放烟花绽放动画效果</title></head><bodyonselectstart="return false"><divstyle="height:700px;overflow:hidden;"><canvasid='cas'style="background-color:rgba(0,5,24,1);">浏览器不支持canvas</canvas><divclass="city"><imgsrc="img/city.png"alt=""/></div><imgsrc="img/moon.png"alt=""id="moon"style="visibility: hidden;"/><divstyle="display:none"><divclass="shape">新年快乐</div><divclass="shape">合家幸福</div><divclass="shape">万事如意</div><divclass="shape">心想事成</div><divclass="shape">财源广进</div></div></div><script>var canvas = document.getElementById("cas");var ocas = document.createElement("canvas");var octx = ocas.getContext("2d");var ctx = canvas.getContext("2d");
ocas.width = canvas.width = window.innerWidth;
ocas.height = canvas.height =700;var bigbooms =[];
window.onload=function(){initAnimate()}functioninitAnimate(){drawBg();
lastTime =newDate();animate();}var lastTime;functionanimate(){
ctx.save();
ctx.fillStyle ="rgba(0,5,24,0.1)";
ctx.fillRect(0,0,canvas.width,canvas.height);
ctx.restore();var newTime =newDate();if(newTime-lastTime>500+(window.innerHeight-767)/2){var random = Math.random()*100>2?true:false;var x =getRandom(canvas.width/5, canvas.width*4/5);var y =getRandom(50,200);if(random){var bigboom =newBoom(getRandom(canvas.width/3,canvas.width*2/3),2,"#FFF",{x:x , y:y});
bigbooms.push(bigboom)}else{var bigboom =newBoom(getRandom(canvas.width/3,canvas.width*2/3),2,"#FFF",{x:canvas.width/2, y:200}, document.querySelectorAll(".shape")[parseInt(getRandom(0, document.querySelectorAll(".shape").length))]);
bigbooms.push(bigboom)}
lastTime = newTime;
console.log(bigbooms)}
stars.foreach(function(){this.paint();})drawMoon();
bigbooms.foreach(function(index){var that =this;if(!this.dead){this._move();this._drawLight();}else{this.booms.foreach(function(index){if(!this.dead){this.moveTo(index);}elseif(index === that.booms.length-1){
bigbooms[bigbooms.indexOf(that)]=null;}})}});raf(animate);}functiondrawMoon(){var moon = document.getElementById("moon");var centerX = canvas.width-200, centerY =100, width =80;if(moon.complete){
ctx.drawImage(moon , centerX , centerY , width , width )}else{
moon.onload=function(){
ctx.drawImage(moon ,centerX , centerY , width , width)}}var index =0;for(var i=0;i<10;i++){
ctx.save();
ctx.beginPath();
ctx.arc(centerX+width/2, centerY+width/2, width/2+index ,0,2*Math.PI);
ctx.fillStyle="rgba(240,219,120,0.005)";
index+=2;
ctx.fill();
ctx.restore();}}Array.prototype.foreach=function(callback){for(var i=0;i<this.length;i++){if(this[i]!==null)callback.apply(this[i],[i])}}var raf = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame ||function(callback){ window.setTimeout(callback,1000/60);};
canvas.onclick=function(){var x = event.clientX;var y = event.clientY;var bigboom =newBoom(getRandom(canvas.width/3,canvas.width*2/3),2,"#FFF",{x:x , y:y});
bigbooms.push(bigboom)}// canvas.addEventLisener("touchstart" , function(event){// var touch = event.targetTouches[0];// var x = event.pageX;// var y = event.pageY;// var bigboom = new Boom(getRandom(canvas.width/3,canvas.width*2/3) ,2,"#FFF" , {x:x , y:y});// bigbooms.push(bigboom)// })varBoom=function(x,r,c,boomArea,shape){this.booms =[];this.x = x;this.y =(canvas.height+r);this.r = r;this.c = c;this.shape = shape ||false;this.boomArea = boomArea;this.theta =0;this.dead =false;this.ba =parseInt(getRandom(80,200));}Boom.prototype ={_paint:function(){
ctx.save();
ctx.beginPath();
ctx.arc(this.x,this.y,this.r,0,2*Math.PI);
ctx.fillStyle =this.c;
ctx.fill();
ctx.restore();},_move:function(){var dx =this.boomArea.x -this.x , dy =this.boomArea.y -this.y;this.x =this.x+dx*0.01;this.y =this.y+dy*0.01;if(Math.abs(dx)<=this.ba && Math.abs(dy)<=this.ba){if(this.shape){this._shapBoom();}elsethis._boom();this.dead =true;}else{this._paint();}},_drawLight:function(){
ctx.save();
ctx.fillStyle ="rgba(255,228,150,0.3)";
ctx.beginPath();
ctx.arc(this.x ,this.y ,this.r+3*Math.random()+1,0,2*Math.PI);
ctx.fill();
ctx.restore();},_boom:function(){var fragNum =getRandom(30,200);var style =getRandom(0,10)>=5?1:2;var color;if(style===1){
color ={
a:parseInt(getRandom(128,255)),
b:parseInt(getRandom(128,255)),
c:parseInt(getRandom(128,255))}}var fanwei =parseInt(getRandom(300,400));for(var i=0;i<fragNum;i++){if(style===2){
color ={
a:parseInt(getRandom(128,255)),
b:parseInt(getRandom(128,255)),
c:parseInt(getRandom(128,255))}}var a =getRandom(-Math.PI, Math.PI);var x =getRandom(0, fanwei)* Math.cos(a)+this.x;var y =getRandom(0, fanwei)* Math.sin(a)+this.y;var radius =getRandom(0,2)var frag =newFrag(this.x ,this.y , radius , color , x , y );this.booms.push(frag);}},_shapBoom:function(){var that =this;putValue(ocas , octx ,this.shape ,5,function(dots){var dx = canvas.width/2-that.x;var dy = canvas.height/2-that.y;for(var i=0;i<dots.length;i++){
color ={a:dots[i].a,b:dots[i].b,c:dots[i].c}var x = dots[i].x;var y = dots[i].y;var radius =1;var frag =newFrag(that.x , that.y , radius , color , x-dx , y-dy);
that.booms.push(frag);}})}}functionputValue(canvas , context , ele , dr , callback){
context.clearRect(0,0,canvas.width,canvas.height);var img =newImage();if(ele.innerHTML.indexOf("img")>=0){
img.src = ele.getElementsByTagName("img")[0].src;imgload(img ,function(){
context.drawImage(img , canvas.width/2- img.width/2, canvas.height/2- img.width/2);
dots =getimgData(canvas , context , dr);callback(dots);})}else{var text = ele.innerHTML;
context.save();var fontSize =200;
context.font = fontSize+"px 宋体 bold";
context.textAlign ="center";
context.textBaseline ="middle";
context.fillStyle ="rgba("+parseInt(getRandom(128,255))+","+parseInt(getRandom(128,255))+","+parseInt(getRandom(128,255))+" , 1)";
context.fillText(text , canvas.width/2, canvas.height/2);
context.restore();
dots =getimgData(canvas , context , dr);callback(dots);}}functionimgload(img , callback){if(img.complete){callback.call(img);}else{
img.onload=function(){callback.call(this);}}}functiongetimgData(canvas , context , dr){var imgData = context.getImageData(0,0,canvas.width , canvas.height);
context.clearRect(0,0,canvas.width , canvas.height);var dots =[];for(var x=0;x<imgData.width;x+=dr){for(var y=0;y<imgData.height;y+=dr){var i =(y*imgData.width + x)*4;if(imgData.data[i+3]>128){var dot ={x:x , y:y , a:imgData.data[i], b:imgData.data[i+1], c:imgData.data[i+2]};
dots.push(dot);}}}return dots;}functiongetRandom(a , b){return Math.random()*(b-a)+a;}var maxRadius =1, stars=[];functiondrawBg(){for(var i=0;i<100;i++){var r = Math.random()*maxRadius;var x = Math.random()*canvas.width;var y = Math.random()*2*canvas.height - canvas.height;var star =newStar(x , y , r);
stars.push(star);
star.paint()}}varStar=function(x,y,r){this.x = x;this.y=y;this.r=r;}Star.prototype ={paint:function(){
ctx.save();
ctx.beginPath();
ctx.arc(this.x ,this.y ,this.r ,0,2*Math.PI);
ctx.fillStyle ="rgba(255,255,255,"+this.r+")";
ctx.fill();
ctx.restore();}}var focallength =250;varFrag=function(centerX , centerY , radius , color ,tx , ty){this.tx = tx;this.ty = ty;this.x = centerX;this.y = centerY;this.dead =false;this.centerX = centerX;this.centerY = centerY;this.radius = radius;this.color = color;}Frag.prototype ={paint:function(){
ctx.save();
ctx.beginPath();
ctx.arc(this.x ,this.y ,this.radius ,0,2*Math.PI);
ctx.fillStyle ="rgba("+this.color.a+","+this.color.b+","+this.color.c+",1)";
ctx.fill()
ctx.restore();},moveTo:function(index){this.ty =this.ty+0.3;var dx =this.tx -this.x , dy =this.ty -this.y;this.x = Math.abs(dx)<0.1?this.tx :(this.x+dx*0.1);this.y = Math.abs(dy)<0.1?this.ty :(this.y+dy*0.1);if(dx===0&& Math.abs(dy)<=80){this.dead =true;}this.paint();}}</script></body></html>
新建文件夹img把以下两张图片放进去
city.png
moon.png
本文转载自: https://blog.csdn.net/u013343616/article/details/122233674
版权归原作者 A雄 所有， 如有侵权，请联系我们删除。
版权归原作者 A雄 所有， 如有侵权，请联系我们删除。