canvas时钟
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>时钟canvas</title>
<script>
window.onload = function(){
var oc = document.getElementById('can1');
var ogc = oc.getContext('2d');
toDraw();
setInterval(function(){
toDraw();
},1000);
function toDraw(start){
var x = 200;
var y = 200;
var r = 150;
ogc.clearRect(0,0,oc.width,oc.height);
// now time
var odate = new Date();
var ohour = odate.getHours();
var omin = odate.getMinutes();
var osen = odate.getSeconds();
var ohourValue = (-90 + ohour*30 + omin/2)*Math.PI/180;
var ominValue = (-90 + omin*6)*Math.PI/180;
var osenValue = (-90 + osen*6)*Math.PI/180;
// sen arc line
drawArcline(x,y,r,60,6,1);
fillCircle(x,y,r,19);
// hour arc line
drawArcline(x,y,r,12,30,3);
fillCircle(x,y,r,18);
// hour
drawTimeLine(x,y,r,10,ohourValue,5);
// min
drawTimeLine(x,y,r,14,ominValue,3);
// sen
drawTimeLine(x,y,r,19,osenValue,1);
/*start ? drawTimeLine(x,y,r,19,osenValue+1,1) : drawTimeLine(x,y,r,19,osenValue,1);*/
}
function drawTimeLine(x,y,r,sc,otimeValue,lw){
ogc.lineWidth = lw;
ogc.beginPath();
ogc.moveTo(x,y);
ogc.arc(x,y,r*sc/20,otimeValue,otimeValue,false);
ogc.closePath();
ogc.stroke();
}
function drawArcline(x,y,r,ts,hr,lw){
ogc.beginPath();
ogc.lineWidth = lw;
for (var i = 0; i < ts; i++) {
ogc.moveTo(x,y);
ogc.arc(x,y,r,hr*i*Math.PI/180,hr*(i+1)*Math.PI/180,false);
};
ogc.closePath();
ogc.stroke();
}
function fillCircle(x,y,r,sc){
ogc.beginPath();
ogc.fillStyle = '#fff';
ogc.moveTo(x,y);
ogc.arc(x,y,r*sc/20,0,360*Math.PI/180,false);
ogc.closePath();
ogc.fill();
}
}
</script>
</head>
<body>
<canvas id="can1" width='400' height="400"></canvas>
</body>
</html>
