本文為大家帶來了一款,免費又安全環保的HTML5 Canvas實現的放煙火特效。 效果如下: 程式碼如下: XML/HTML Code複製內容到剪貼簿 HTML> html> 頭> 標題>Canvas 🎜>標題> 元 字符集=字符集> 元 -UA-相容" 內容="IE=edge"> 🎜> 元 名稱="視口" 內容=「寬度=設備寬度,高度=設備高度,初始比例=1.0,最大比例=1.0 ,user-scalable =no"> 樣式 類型> html,body{高度:100%;邊距:0;填色:0} ul,li{text-indent:0;text-decoration:none;margin:0;padding:0} img{border:0} 正文{背景顏色:#000;顏色:#999;字體:100%/18px helvetica、 arial、 sans-serif} 畫布{遊標:十字準線;顯示:塊;左:0;位置:絕對;頂部:0;z-index:20} #header img{width:100%; 高度:20%;} #bg img{寬度:100%; 高度:80%;} #header,#bg{position:fixed;left:0;right:0;z-index:10} #header{top:0} #bg{position:fixed;z-index:1;bottom:0} 音訊{position:fixed;display:none;bottom:0;left:0;right:0;width:100%;z-index:5} 樣式> 頭> 身體> div id=id=id = 🎜>> img id id = 🎜> src="http://img.ivsky.com/img/tupian/pre/201508/02/yuzhou_xingkong jpg"> div> 腳本 src= src = /cdn.bootcss.com/jquery/2.2.0/jquery.min.js">腳本 > 腳本 > >腳本 > >腳本 > >腳本 > 腳本> $(function(){ var 煙火 = 函數 (){ var 自我 = 這個; 這個; //產生煙火隨機數 var rand = 函數(rMi, //按位取反練習 return ~~((Math.random()*(rMa-rMi 1)) rMi); },hitTest = 函數(x1, h2){ 返回! (x1 w1 x2 || x2 🎜>x1 || y1 h1 y1); }; //請求動畫影格 window.requestAnimFrame=函數(){ > 返回 window.requestAnimationFrame ||window.webkitRequestAnimationFrame ||window.mozRequestAnimationFrame ||window.oRequestAnimationFrame ||window.msRequestAnimationFrame ||函數(回呼){ window.setTimeout(callback,1000/60); } }(); self.init = 函數(){>函數 (){ self.canvas = 文件.. //canvas 全螢幕 selfself.canvas.width = self self self.canvas.height = ).innerHeight(); self.articles = []; self.partCount = 150 self.fireworks = []; self self.mx = self.cw/2; self self.my = self.ch/2; = 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); selfself.ctx = self.canvas.getContext('2d'); self.ctx.lineCap = '圓形'; self.ctx.lineJoin = '圓形'; self.lineWidth = 1; self.bindEvents(); self.canvasLoop(); self.canvas.onselectstart = 函數 回傳 false; }; }; // 建立包裝藥 self.createParticles = 函數(x,p var 倒數 = self.partCount; while(倒數--){ var newParticle = { x: x, y: y, coordLast: [ {x: x, y: y}, {x: x, y: y}, {x: x, y: y} ], 角度:rand(0, 360), 速度: rand(((self.partSpeed - self.partSpeedVariance) 摩擦力:1 - self.partFriction/100, 重力:self.partGravity/2, 色調:rand(hue-self.hueVariance, 色調 self.hueVariance), 亮度:rand(50, 80), alpha:蘭特(40,100)/100, 衰變:rand(10, 50)/1000, 風:(rand(0, self.partWind) - (self.partWind/2))/25, lineWidth: self.lineWidth }; self.articles.push(newParticle); } }; // 更新彈藥 self.updateParticles = 函數( var i = self.self. while(i--){ var p = self var 弧度 = p. var vx = 數學 var vy = 數學 p.速 *= p.摩擦力; p.coordLast[2].x = p<.> p.coordLast[2].y = p p.coordLast[1].x = p<.> p.coordLast[1].y = p<.> p.coordLast[0] .x = p p.coordLast[0] .y = p p.x = vx; p.y = vy; p.y = p.gravity; p.angle = p.wind; p.alpha -= p if(!hitTest(0,0,self.cw,self.ch,p.x-p.radius, p.y-p.radius, p.radius*2, p.radius*2) .alpha .05){ self.articles.splice(i, 1); } }; }; // 均勻劑量 self.drawParticles = 函數( var i = self.self . while(i--){ var p = self .articles 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(' self.ctx.中風(); if(self.flickerDensity > 0){ var inverseDensity = 50 = 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, 0,205) self.ctx.closePath(); var randrandAlpha = rand(50,1000)/1000; self.ctx.fillStyle = ? .亮度'%,'randAlpha')'; self.ctx.fill(); } } }; }; // 創建煙火 self.createFireworks = 函數 var newFirework = { x: startX, y:開始Y, startX: startX, startY: startY, hitX:假, hitY:假, coordLast: [ {x: startX, y: startY}, {x: startX, y: startY}, {x: startX, y: startY} ], targetX: targetX, targetY: targetY, 速度:self.fworkSpeed, 角度:Math.atan2(targetY - startY, targetX - startX), shockwaveAngle: Math.atan2(targetY - startY, targetX - startX) (90*(Math.PI/180)), 加速度:self.fworkAccel/100, 色調:self.currentHue, 亮度:rand(50, 80), alpha:蘭特(50,100)/100, lineWidth: self.lineWidth }; self.fireworks.push(newFirework); }; //更新煙火 self.updateFireworks = 函數( var i = self . while(i--){ var f = self. self.ctx.lineWidth = f.lineWidth; vx = 數學 vy = .sin(.>.sin(f..angle); f.speed *= 1 f.acceleration; f.coordLast[2] .x = ff f.coordLast[2].y = f f.coordLast[1].x = f f f.coordLast[1].y = f f.coordLast[0].x = f f.coordLast[0].y = f if(f.startX > = f.targetX){ = f.targetX){ = f.targetX){ if(f.x vx = f.targetX){ = f.targetX){ = f.targetX){ = f.targetX){ ff.x = f.targetX; f.hitX = true; } 其他 { f.x = vx; } } 其他 { if(f.x vx > = f.targetX){ = f.targetX){ = f.targetX){ = f.targetX){ ff.x = f.targetX; f.hitX = true; } 其他 { f.x = vx; } } if(f.startY >= f.targetY){ = f.targetY){ = f.targetY){ if(f.y vy = f.targetY){ ff.y = f.targetY; f.hitY = true ; } 其他 { f.y = vy; } } 其他 { if(f.y vy >= f.targetY){ > ff.y = f.targetY; f.hitY = true; } 其他 { f.y = vy; } } if(f.hitX && f.hitY){ self.createParticles(f.targetX, f.targetY, f.hue); self.fireworks.splice(i, 1); } }; }; // 均勻煙火 self.drawFireworks = 函數(){ var i = self . self.ctx.globalCompositeOperation = '更輕' = '更輕'; while(i--){ var f = self. 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(' = self.ctx.中風(); if(self.showTarget){ self.ctx.save(); self.ctx.beginPath(); self.ctx.arc(Math.round(f.targetX), Math.round(f.targetY), rand self.ctx.closePath(); self.ctx.lineWidth = 1; self.ctx.中風(); 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(' = 'hsla(' = 'hsla(' self.ctx.lineWidth = f.lineWidth; self.ctx.中風(); self.ctx.restore(); } }; }; // 綁定事件 self.bindEvents = 函數() $(window).on('resize', function(){ clearTimeout(self.timeout); self.timeout = setTimeout setTimeout selfself.canvas.width =o selfself.canvas.height self ).innerHeight(); self.ctx.lineCap = '圓形' = '圓形' ; self.ctx.lineJoin = '圓形' = '圓形' ; }, 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.hu>rand (self.hu 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 rand self.createFireworks(self.cw/2, self.ch, self.mx, self.my); }); }); $(self.canvas).on('mouseup', function(e){ $(self.canvas).off('mousemove.fireworks'); }); }; self.clear = 函數(){🎜>函數 (){ > self.articles = []; self.fireworks = []; self.ctx.clearRect(0, 0, self.cw, self.ch); }; self.canvasLoop = 函數 () requestAnimFrame(self.canvasLoop, self.canvas); self.ctx.globalCompositeOperation = 'destination-out self.ctx.fillStyle = 'rgba(0,0,0,00,0,0,000 100 ')'; self.ctx.fillRect(0,0,self.cw,self.ch); self.updateFireworks(); self.updateParticles(); self.drawFireworks(); self.drawParticles(); }; self.init(); } var fworks = new $('#info-toggle').on('click', function(e){ $('#info-inner').stop(false, true).slideToggle(100); e.preventDefault(); }); }); 腳本> 畫布 寬度=寬度= 🎜> 身高="449">> > 身體> html> 不是被HTML5強大的效果驚呆了,一飽眼福了吧。