html5 canvas 钟表

浏览数：35 / 时间：2015年06月09日

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<style>
body{
    background:pink;
    }
#c1{
    background:white;
    }
</style>
<script>
    window.onload = function ()
    {
        var oc = document.getElementById(‘c1‘);
        var ogc = oc.getContext(‘2d‘);
        
        function toDraw()
        {
            var x = 200;
            var y = 200;
            var r = 150;
            
            ogc.clearRect(0,0,oc.width,oc.height);
            
            var aDate = new Date();
            var oHouse = aDate.getHours();
            var oMin = aDate.getMinutes();
            var oSen = aDate.getSeconds();
            
            var oHoursevalue = ( -90 + oHouse*30 + oMin/2)*Math.PI/180;
            var oMinvalue = ( -90 + oMin*6 )*Math.PI/180;
            var oSenvalue = ( -90 + oSen*6)*Math.PI/180;
            
            ogc.beginPath();
            for(var i = 0; i < 60; i++)
            {
                ogc.moveTo(x,y);
                ogc.arc(x,y,r,6*i*Math.PI/180,6*(i+1)*Math.PI/180,false);
                ogc.stroke();
            }
            
            ogc.closePath();
            
            ogc.beginPath();
            ogc.fillStyle = ‘white‘;
            ogc.moveTo(x,y);
            ogc.arc(x,y,r*19/20,0,360,false);
            ogc.fill();
            
            ogc.closePath();
            
            ogc.beginPath();
            ogc.lineWidth = 3
            for(var i = 0; i < 12; i++)
            {
                ogc.moveTo(x,y);
                ogc.arc(x,y,r,30*i*Math.PI/180,30*(i+1)*Math.PI/180,false);
                ogc.stroke();
            }
            
            ogc.closePath();
            
            ogc.beginPath();
            ogc.fillStyle = ‘white‘;
            ogc.moveTo(x,y);
            ogc.arc(x,y,r*18/20,0,360,false);
            ogc.fill();
            
            ogc.closePath();
            
            
            
            ogc.beginPath();
            ogc.lineWidth = 5
            ogc.moveTo(x,y);
            ogc.arc(x,y,r*5/20,oHoursevalue,oHoursevalue,false);
            ogc.stroke();
            ogc.closePath();
            
            ogc.beginPath();
            ogc.lineWidth = 3
            ogc.moveTo(x,y);
            ogc.arc(x,y,r*8/20,oMinvalue,oMinvalue,false);
            ogc.stroke();
            ogc.closePath();
            
            ogc.beginPath();
            ogc.lineWidth = 1
            ogc.moveTo(x,y);
            ogc.arc(x,y,r*18/20,oSenvalue,oSenvalue,false);
            ogc.stroke();
            ogc.closePath();
            
        }
        
        toDraw();
        
        setInterval(toDraw,1000);
        
    }
</script>
</head>

<body>

<canvas id="c1" width="400" height="400"></canvas>
</body>
</html>