Canvas线条动画

简单的Canvas动画，代码只有71行，试试吧！没有谁天生就会，用这个动画，做为你的Canvas小结。如果你觉得我的代码还算有趣，在你的学习中能有所帮助，请查看我的置顶文章，我由衷感谢！

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<script src="jquery.js"></script>
	<title>Document</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>
</body>
<script>
	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 + ')';
}
</script>
</html>

如果你对代码有任何疑问，请在下方?留言，或私信博主，能在前端学习中与你一同进步，是我发表博文的意义。