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Use html5 to implement a simple clock appearance

零下一度Original: 2017-04-27 15:08:372419browse

html5 has been out for a long time, but there are still not many friends who don’t understand it. Let’s use html5 to implement a simple clock appearance

<html lang="en-US">
<style>
	#myCanvas{border:3px solid blue;}
</style>
<head>
	<script type="text/javascript">
		window.onload = function()
		{
			var mycanvas = document.getElementById("myCanvas");
			var context = mycanvas.getContext("2d");
					
			context.lineWidth = 2;
			context.strokeStyle = "blue";
			context.fillStyle = "blue";
			context.arc(250,200,5,0,Math.PI*2,true);
			context.fill();

			context.beginPath();
			context.arc(250,200,150,0,Math.PI*2,true);
			context.stroke();

			context.translate(250,200);
			context.rotate(-Math.PI/2);
			
			context.save();
			for(var i=0;i<60;i++)
			{
				if(i % 5 == 0)
				{
					context.fillRect(130,0,20,5);		
					context.fillText((i/5 == 0?12:i/5),120,5);
				}
				else
				{
					context.fillRect(140,0,10,2)
				}
				context.rotate(Math.PI/30);				//360°每6度旋转一次
			}
			
			context.fillRect(0,-2,90,3);

			context.stroke();
		}
	</script>
</head>

<body>
	<canvas id=myCanvas width=500px height=400px></canvas>
</body>
</html>

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