Canvas时钟
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Canvas 时钟</title>
<style>
div{
text-align: center;
margin-top: 200px;
}
div p{
color: #000;
font-size: 1rem;
}
</style>
</head>
<body>
<div>
<p id="newDate"></p>
<canvas id="clock" height="300px" width="300px"></canvas>
</div>
<script type="text/javascript">
var newDate=document.getElementById("newDate");
var dom=document.getElementById("clock");
var ctx=dom.getContext('2d');
var width=ctx.canvas.width;
var height=ctx.canvas.height;
var r=width/2;
var rem=width/200;/*画布做适应*/
function drawBackground(){
ctx.save();
ctx.translate(r,r);
ctx.beginPath();
ctx.lineWidth=10*rem;
ctx.arc(0,0,r-ctx.lineWidth/2,0,2*Math.PI,false);
ctx.stroke();/*画圆*/
var hourNumber=[3,4,5,6,7,8,9,10,11,12,1,2];
ctx.font=18*rem+"px Arial";
ctx.textAlign="center";
ctx.textBaseline="middle";
hourNumber.forEach(function(number,i){/*画十二个小时*/
var rad=2*Math.PI/12*i;
var x=Math.cos(rad)*(r-30*rem);
var y=Math.sin(rad)*(r-30*rem);
ctx.fillText(number,x,y);
});
for(var i=0;i<60;i++){
var rad=2*Math.PI/60*i;
var x=Math.cos(rad)*(r-18*rem);
var y=Math.sin(rad)*(r-18*rem);
ctx.beginPath();
if(i%5===0){/*点为小时时黑色非小时时灰色*/
ctx.fillStyle="#000";
ctx.arc(x,y,2*rem,0,2*Math.PI,false);
}else {
ctx.fillStyle="#ccc";
ctx.arc(x,y,2*rem,0,2*Math.PI,false);
}
ctx.fill();/*填充圆点*/
}
}
function drawHour(hour,minute){/*时针*/
ctx.save();
ctx.beginPath();
var rad=2*Math.PI/12*hour;
var mrad=2*Math.PI/12/60*minute;
ctx.rotate(rad+mrad);
ctx.lineWidth=6*rem;
ctx.lineCap="round";
ctx.moveTo(0,10*rem);
ctx.lineTo(0,-r/2);/*时针位置*/
ctx.stroke();
ctx.restore();
}
function drawMinute(minute){/*分针*/
ctx.save();
ctx.beginPath();
var rad=2*Math.PI/60*minute;
ctx.rotate(rad);
ctx.lineWidth=3*rem;
ctx.lineCap="round";
ctx.moveTo(0,10*rem);
ctx.lineTo(0,-r+30*rem);/*时针位置*/
ctx.stroke();
ctx.restore();
}
function drawSecond(second){/*秒针*/
ctx.save();
ctx.beginPath();
ctx.fillStyle="#c14543";
var rad=2*Math.PI/60*second;
ctx.rotate(rad);
ctx.moveTo(-2*rem,20*rem);
ctx.lineTo(2*rem,20*rem);
ctx.lineTo(1,-r+18*rem);
ctx.lineTo(-1,-r+18*rem);
ctx.fill();
ctx.restore();
}
function drawDot(){/*中心圆点*/
ctx.beginPath();
ctx.fillStyle="#fff";
ctx.arc(0,0,3*rem,0,2*Math.PI,false);
ctx.fill();
}
function draw() {
ctx.clearRect(0,0,width,height);
var now=new Date();
var hour=now.getHours();
var minute=now.getMinutes();
var second=now.getSeconds();
drawBackground();
drawHour(hour, minute);
drawMinute(minute);
drawSecond(second);
drawDot();
ctx.restore();
var newd=hour+":"+minute+":"+second;
newDate.innerText="当前时间=="+newd;
}
draw();
setInterval(draw,1000);
</script>
</body>
</html>
浙公网安备 33010602011771号