Canvas实现放射线动画效果

2019-11-19 17:34:39

字体：大中小

来源：转载

供稿：网友

效果如下：

代码如下：

<!DOCTYPE html><html> <head> <meta charset="UTF-8"> <title></title> <style> body {background: #000;overflow: hidden;margin: 0;padding: 0;} #canv {width: 45%;margin: 5% 30%;animation: wheel-rotate 30s linear infinite;} @keyframes wheel-rotate { from { transform: rotate(0deg); } to { transform: rotate(360deg); } } </style> </head> <body> <canvas id="canv" width="600" height="600"></canvas> <script type="text/javascript"> var c; var $; var w = 600; var h = 600; constant = 15; var rad = 300; var timeout = 0; c = document.getElementById("canv"); $ = c.getContext("2d"); drawLines(); function drawLines() { $.fillRect(0,0,w,h); $.translate(w/2,h/2); for (var i = 0; i < 25; i++) { for (var n = -45; n <= 45; n+=constant) { setTimeout("draw("+n+");",100 * timeout); timeout++; } } } function draw(n){ $.beginPath(); $.moveTo(0,rad); var radians = Math.PI/180*n; var x = (rad * Math.sin(radians)) / Math.sin(Math.PI/2 - radians); $.lineTo(x,0); if (Math.abs(n) == 45) { $.strokeStyle=rndColor(); $.lineWidth=2; } else if (n == 0) { $.strokeStyle="rgb(200,200,200)"; $.lineWidth=.5; } else { $.strokeStyle="rgb(110,110,110)"; $.lineWidth=.5; } $.stroke(); $.rotate((Math.PI/180)*15); } function rndColor() { var r = 255*Math.random()|0,  g = 255*Math.random()|0,  b = 255*Math.random()|0; return 'rgb(' + r + ',' + g + ',' + b + ')'; } function myrefresh(){  //window.location.reload();  //drawLines() } //setTimeout('myrefresh()',100*175); </script> </body></html>

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