canvas火焰效果程式碼例項
分享一段程式碼例項,它實現了火焰燃燒的動態效果。
程式碼例項如下:
[HTML] 純文字檢視 複製程式碼執行程式碼<!doctype html> <html> <head> <meta charset="utf-8"> <meta name="author" content="http://www.softwhy.com/" /> <title>螞蟻部落</title> <style type="text/css"> body { background: rgb(36, 36, 36); text-align: center; } #fire { width: 100%; height: 100%; } </style> <script src="http://libs.baidu.com/jquery/1.9.0/jquery.js"></script> <script type="text/javascript"> $(document).ready(function() { var space = document.getElementById("fire"); var ctx = space.getContext("2d"); var particles = []; var particle_count = 150; for (var i = 0; i < particle_count; i++) { particles.push(new particle()); } var time = 0; var canvasWidth = 320; var canvasHeight = 480; $(".wrapper").css({ width: canvasWidth, height: canvasHeight }); $("#fire").css({ width: canvasWidth, height: canvasHeight }); window.requestAnimFrame = (function() { return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || function(callback) { window.setTimeout(callback, 6000 / 60); }; })(); function particle() { this.speed = { x: -1 + Math.random() * 2, y: -5 + Math.random() * 5 }; canvasWidth = (document.getElementById("fire").width); canvasHeight = (document.getElementById("fire").height); this.location = { x: canvasWidth / 2, y: (canvasHeight / 2) + 35 }; this.radius = 0.5 + Math.random() * 1; this.life = 10 + Math.random() * 10; this.death = this.life; this.r = 255; this.b = 0; this.g = Math.round(Math.random() * 52); } function ParticleAnimation() { ctx.globalCompositeOperation = "source-over"; ctx.fillStyle = "rgb(36,36,36)"; ctx.fillRect(0, 0, canvasWidth, canvasHeight); ctx.globalCompositeOperation = "lighter"; for (var i = 0; i < particles.length; i++) { var p = particles[i]; ctx.beginPath(); p.opacity = Math.round(p.death / p.life * 100) / 100 var gradient = ctx.createRadialGradient(p.location.x, p.location.y, 0, p.location.x, p.location.y, p.radius); gradient.addColorStop(0, "rgba(" + p.r + ", " + p.g + ", " + p.b + ", " + p.opacity + ")"); gradient.addColorStop(0.5, "rgba(" + p.r + ", " + p.g + ", " + p.b + ", " + p.opacity + ")"); gradient.addColorStop(1, "rgba(" + p.r + ", " + p.g + ", " + p.b + ", 0)"); ctx.fillStyle = gradient; ctx.arc(p.location.x, p.location.y, p.radius, Math.PI * 2, false); ctx.fill(); p.death--; p.radius++; p.location.x += (p.speed.x); p.location.y += (p.speed.y); if (p.death < 0 || p.radius < 0) { particles[i] = new particle(); } } requestAnimFrame(ParticleAnimation); } ParticleAnimation(); }); </script> </head> <body> <canvas id="fire"></canvas> </body> </html>
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