2022跨年烟花代码（九）HTML5夜景放烟花绽放动画效果_u013343616_html放烟花的代码

未知 02-07 1454

HTML5夜景放烟花绽放动画效果

html代码

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://·plete){ 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 = new Boom(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) // }) var Boom = 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(); } else this._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 = new Frag(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 = new Frag(that.x , that.y , radius , color , x-dx , y-dy); that.booms.push(frag); } }) } } function putValue(canvas , context , ele , dr , callback){ context.clearRect(0,0,canvas.width,canvas.height); var img = new Image(); 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); } } function imgload(img , callback){ if(img.complete){ callback.call(img); } else { img.onload = function(){ callback.call(this); } } } function getimgData(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; } function getRandom(a , b){ return Math.random()*(b-a)+a; } var maxRadius = 1 , stars=[]; function drawBg(){ 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 = new Star(x , y , r); stars.push(star); star.paint() } } var Star = 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; var Frag = 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