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html5时钟

先贴代码，有空详细下

<!DOCTYPE HTML>
<html>
<head>
	<meta charset="UTF-8">
	<style type="text/css">
	canvas{position:absolute;top:0px;left:0px;}
	</style>
	<title>时钟</title>
</head>
<body>
	<canvas id="canvas" width="200" height="200"></canvas>
	<canvas id="p_canvas" width="200" height="200"></canvas>
	<script type="text/javascript">
	//获取绘图对象
	var canvas = document.getElementById('canvas');
	var context = canvas.getContext('2d');	
	
	var p_canvas = document.getElementById('p_canvas');
	var p_context = p_canvas.getContext('2d');
	
	var height=200,width=200;
	//画大圆	
	context.beginPath();
	context.strokeStyle="#009999";
	context.arc(width/2,height/2,width/2-1,0,Math.PI*2,true);
	context.stroke();
	context.closePath();
	//画中间点
	context.beginPath();
	context.fillStyle="#000";
	context.arc(width/2,height/2,3,0,Math.PI*2,true);
	context.fill();
	context.closePath();
	
	//画小刻度
	var angle = 0,radius = width/2 - 4;	
	for(var i=0;i<60;i++){
		context.beginPath();
		context.strokeStyle="#000";
		//确认刻度的起始点
		var x = width/2 + radius*Math.cos(angle),y = height/2 + radius*Math.sin(angle);		
		context.moveTo(x,y);
		//这里是用来将刻度的另一点指向中心点，并给予正确的角度
		//PI是180度，正确的角度就是 angle+180度，正好相反方向
		var temp_angle = Math.PI +angle;		
        context.lineTo(x +3*Math.cos(temp_angle),y+3*Math.sin(temp_angle));
		context.stroke();
		context.closePath();
		angle+=6/180*Math.PI;
	}
	//大刻度
	angle = 0,radius = width/2 - 4;	
	context.textBaseline = 'middle';
	context.textAlign = 'center';
	context.lineWidth = 2;
	for(var i=0;i<12;i++){
		var num = i+3>12? i+3-12:i+3 ;	
		context.beginPath();
		context.strokeStyle="#FFD700";
		var x = width/2 + radius*Math.cos(angle),y = height/2 + radius*Math.sin(angle);	
		context.moveTo(x,y);
		var temp_angle = Math.PI +angle;		
        context.lineTo(x +8*Math.cos(temp_angle),y+8*Math.sin(temp_angle));
		context.stroke();
		context.closePath();
		//大刻度 文字
		context.fillText(num,x+16*Math.cos(temp_angle),y+16*Math.sin(temp_angle));
		angle+=30/180*Math.PI;
	}
	
	function Pointer(){
		var p_type	= [['#000',70,1],['#ccc',60,2],['red',50,3]];
		function drwePointer(type,angle){
			type = p_type[type];
			angle = angle*Math.PI*2 - 90/180*Math.PI;	
			var length= type[1];
			p_context.beginPath();
			p_context.lineWidth = type[2];
			p_context.strokeStyle = type[0];
			p_context.moveTo(width/2,height/2);		
			p_context.lineTo(width/2 + length*Math.cos(angle),height/2 + length*Math.sin(angle));		
			p_context.stroke();
			p_context.closePath();
			
		}
		setInterval(function (){
			p_context.clearRect(0,0,height,width);
			var time = new Date();
			var h = time.getHours();
			var m =	time.getMinutes();
			var s = time.getSeconds();			
			h = h>12?h-12:h;
			h = h+m/60; 
			h=h/12;
			m=m/60;
			s=s/60;
			drwePointer(0,s);
			drwePointer(1,m);
			drwePointer(2,h);		
		},500);
	}
	var p = new Pointer();
	</script>
</body>
</html>

posted on 2010-10-21 17:59  TAOTAO.  阅读(425)  评论(0)    收藏  举报