Artikel ini membawakan anda kesan khas bunga api percuma, selamat dan mesra alam yang dilaksanakan dalam Kanvas HTML5.
Kesannya adalah seperti berikut:
Kod adalah seperti berikut:
Kod XML/HTMLSalin kandungan ke papan keratan
- >
-
<html>
-
<kepala>
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<tajuk>Kanvas 实现放烟花特>效;>tajuk>
- <meta charset="utf- 8">
- <meta http-equiv=" X-UA-Serasi" kandungan="IE=edge">
- <meta nama="viewport" kandungan="width=device-width,height=device-height,inital-scale=1.0,maximum-scale=1.0 ,user-scalable=no">
- <gaya taip="teks/ css">
html,badan{ketinggian:100%;margin:0;padding:0}
-
ul,li{text-indent:0;text-decoration:none;margin:0; padding:0}
-
img{border:0}
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body{background-color:#000;color:#999;font:100%/18px helvetica, arial, sans-serif}
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kanvas{kursor:crosshair;display:block;left:0;position:absolute;top:0;z-index:20}
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#header img{width:100%; ketinggian:20%;}
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#bg img{lebar:100%; ketinggian:80%;}
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#header,#bg{position:fixed;left:0;right:0;z-index:10}
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#header{atas:0}
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#bg{position:fixed;z-index:1;bottom:0}
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audio{position:fixed;display:none;bottom:0;left:0;right:0;width:100%;z-index:5}
-
gaya>
-
kepala>
-
<badan>
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<div id="bg" >
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<img id="bgimg" src="http://img.ivsky.com/img/tupian/pre/201508/02/yuzhou_xingkong_yu_yueliang-006 .jpg">
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div>
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<skrip src="http: //cdn.bootcss.com/jquery/2.2.0/jquery.min.js">skrip >
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<skrip>
- $(fungsi(){
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var Bunga Bunga = fungsi(){
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var diri = ini;
- // 产生烟花随机数
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var rand = fungsi(rMi, rMa){
- //按位取反运算符
- pulangan ~~((Math.random()*(rMa-rMi 1)) rMi);
-
},hitTest = fungsi(x1, y1, w1, h1, x2, y2, w2, h2){
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pulangan !(x1 w1 < x2 || x2 w2 ;< x1 || y1 h1 < y2<🎜 || . y2 h2 < y1);
};
- //请求动画帧
- window.requestAnimFrame=fungsi(){
- return window.requestAnimationFrame
- ||window.webkitRequestAnimationFrame
- ||window.mozRequestAnimationFrame
- ||window.oRequestAnimationFrame
- ||window.msRequestAnimationFrame
- ||fungsi(panggilan balik){
- window.setTimeout(panggilan balik,1000/60);
- }
- }();
- self.init = fungsi(){
- self.canvas = dokumen.createElement('canvas');
- //kanvas 全屏
- diridiri.kanvas.lebar = diri.cw = $(tetingkap ).innerWidth();
- diridiri.kanvas.tinggi = diri.ch = $(tingkap ).innerHeight();
- zarah.diri = [];
- self.partCount = 150;
- bunga api diri = [];
- diridiri.mx = diri.cw/2;
- diridiri.saya = diri.ch/2;
- self.currentHue = 30;
- self.partSpeed = 5;
- self.partSpeedVariance = 10;
- sendiri.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 = benar;
- self.showTarget = palsu;
- self.clearAlpha = 25;
- $(document.body).append(self.canvas);
- diridiri.ctx = self.canvas.getContext('2d');
- self.ctx.lineCap = 'pusingan';
- self.ctx.lineJoin = 'pusingan';
- self.lineWidth = 1;
- self.bindEvents();
- self.canvasLoop();
- self.canvas.onselectstart = fungsi() {
- pulangan palsu;
- };
- };
- // 创建粒子
- self.createParticles = fungsi(x,y, rona){
- var kira detik = diri.partCount;
- semasa(kira detik--){
- var newParticle = {
- x: x,
- y: y,
- coordLast: [
- {x: x, y: y},
- {x: x, y: y},
- {x: x, y: y}
- ],
- sudut: rand(0, 360),
- kelajuan: rand(((self.partSpeed - self.partSpeedVariance) <= 0) ? 1 : self.partSpeed - self.partSpeed - self.partSpeed .partSpeed self.partSpeedVariance)),
- geseran: 1 - self.partFriction/100,
- graviti: self.partGravity/2,
- warna: rand(hue-self.hueVariance, hue self.hueVariance),
- kecerahan: rand(50, 80),
- alfa: rand(40,100)/100,
- pereputan: rand(10, 50)/1000,
- angin: (rand(0, self.partWind) - (self.partWind/2))/25,
- lineWidth: self.lineWidth
- };
- self.particles.push(newParticle);
- }
- };
- // 更新粒子
- self.updateParticles = fungsi(){
- var i = diri.zarah.panjang;
- semasa(i--){
- var p = diri.zarah[i];
- var radian = p.sudut * Math.PI / 180;
- var vx = Matematik.cos(radian) * p.speed;
- var vy = Matematik.sin(radian) * p.speed;
- p.kelajuan *= p.geseran;
- 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.graviti;
- p.sudut = p.angin;
- p.alpha -= p.pereputan;
- 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);
- }
- };
- };
- // 绘制粒子
- self.drawParticles = fungsi(){
- var i = diri.zarah.panjang;
- semasa(i--){
- var p = diri.zarah[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 .kecerahan '%, ' p.alpha ')';
- self.ctx.stroke();
- jika(self.flickerDensity > 0){
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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();
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var randrandAlpha = rand(50,100)/100;
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self.ctx.fillStyle = 'hsla(' p.hue ', 100%, ' p .kecerahan '%, ' randAlpha ')';
- self.ctx.fill();
- }
- }
- };
- };
- // 创建烟花
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self.createFireworks = fungsi(startX, startY, targetX, targetY){
- var Firework baharu = {
- x: startX,
- y: startY,
- startX: startX,
- startY: startY,
- hitX: salah,
- hitY: salah,
- coordLast: [
- {x: startX, y: startY},
- {x: startX, y: startY},
- {x: startX, y: startY}
- ],
- targetX: targetX,
- targetY: targetY,
- kelajuan: self.fworkSpeed,
- sudut: Math.atan2(targetY - startY, targetX - startX),
- shockwaveAngle: Math.atan2(targetY - startY, targetX - startX) (90*(Math.PI/180)),
- pecutan: self.fworkAccel/100,
- warna: self.currentHue,
- kecerahan: rand(50, 80),
- alfa: rand(50,100)/100,
- lineWidth: self.lineWidth
- };
- self.fireworks.push(newFirework);
- };
- // 更新烟花
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self.updateFireworks = fungsi(){
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var i = diri.bunga api.panjang;
- semasa(i--){
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var f = diri.bunga api[i];
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self.ctx.lineWidth = f.lineWidth;
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vx = Matematik.cos(f.angle) * f.speed,
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vy = Math.sin(f.angle) * f.speed;
- f.kelajuan *= 1 f.pecutan;
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f.coordLast[2].x = f.coordLast[1].x;
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f.coordLast[2].y = f.coordLast[1].y;
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f.coordLast[1].x = f.coordLast[0].x;
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f.coordLast[1].y = f.coordLast[0].y;
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f.coordLast[0].x = f.x;
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f.coordLast[0].y = f.y;
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if(f.startX >= f.targetX){
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jika(f.x vx <= f.targetX){
- ff.x = f.targetX;
- f.hitX = benar;
- } lain {
- f.x = vx;
- }
- } lain {
- jika(f.x vx >= f.targetX){
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ff.x = f.targetX;
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f.hitX = benar;
- } lain {
- f.x = vx;
- }
- }
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if(f.startY >= f.targetY){
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if(f.y vy <= f.targetY){
- ff.y = f.targetY;
- f.hitY = benar;
- } lain {
- f.y = vy;
- }
- } lain {
- jika(f.y vy >= f.targetY){
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ff.y = f.targetY;
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f.hitY = benar;
- } lain {
- f.y = vy;
- }
- }
- jika(f.hitX && f.hitY){
- self.createParticles(f.targetX, f.targetY, f.hue);
- diri.bunga api.splice(i, 1);
- }
- };
- };
- // 绘制烟花
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self.drawFireworks = fungsi(){
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var i = diri.bunga api.panjang;
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self.ctx.globalCompositeOperation = 'lighter';
- semasa(i--){
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var f = diri.bunga api[i];
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self.ctx.lineWidth = f.lineWidth;
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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();
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self.ctx.strokeStyle = 'hsla(' f.hue ', 100%, ' f .kecerahan '%, ' f.alpha ')';
- self.ctx.stroke();
- jika(self.showTarget){
- self.ctx.save();
- self.ctx.beginPath();
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self.ctx.arc(Math.round(f.targetX), Math.round(f.targetY), rand(1,8), 0, Math.PI*2, false)
- self.ctx.closePath();
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self.ctx.lineWidth = 1;
- self.ctx.stroke();
- self.ctx.restore();
- }
- jika(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);
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self.ctx.strokeStyle = 'hsla(' f.hue ', 100%, ' f .kecerahan '%, ' rand(25, 60)/100 ')';
-
self.ctx.lineWidth = f.lineWidth;
- self.ctx.stroke();
- self.ctx.restore();
- }
- };
- };
- // 绑定事件
-
self.bindEvents = fungsi(){
- $(window).on('resize', function(){
- clearTimeout(self.timeout);
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self.timeout = setTimeout(function() {
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diriself.canvas.width = diri.cw = $(tetingkap ).innerWidth();
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diridiri.kanvas.tinggi = diri.ch = $(tetingkap ).innerHeight();
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self.ctx.lineCap = 'pusingan';
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self.ctx.lineJoin = 'pusingan';
- }, 100);
- });
- $(self.canvas).on('mousedown', function(e){
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self.mx = e.pageX - self.canvas.offsetLeft;
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self.my = e.pageY - self.canvas.offsetTop;
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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){
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self.mx = e.pageX - self.canvas.offsetLeft;
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self.my = e.pageY - self.canvas.offsetTop;
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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 = fungsi(){
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zarah.diri = [];
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bunga api diri = [];
- self.ctx.clearRect(0, 0, self.cw, self.ch);
- };
-
self.canvasLoop = fungsi(){
- requestAnimFrame(self.canvasLoop, self.canvas);
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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 = neu Fireworks();
- $('#info-toggle').on('click', function(e){
- $('#info-inner').stop(false, true).slideToggle(100);
- e.preventDefault();
- });
- });
-
Skript>
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<Leinwand Breite="1400" Höhe="449">Leinwand>
-
Körper>
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html>
是不是被HTML5强大的效果惊呆了,一饱眼福了吧.