HTML5 Canvas放射线动画特效代码

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以下是 HTML5 Canvas放射线动画特效代码的示例演示效果:

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HTML代码(index.html):

<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
    <title>HTML5 Canvas放射线动画特效</title>
    <style>
        body {
            background: #000;
            overflow: hidden;
            margin: 0;
        }

        canvas {
            width: 45%;
            margin: 5% 30%;
        }
    </style>
</head>
<body>
    <canvas id="canv" width="600" height="600"></canvas>
    <!--Please allow drawing to finish to see arc angle effect !-->
    <script src="js/index.js"></script>
</body>
</html>

JS代码(index.js):

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 + ')';
}

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