<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>钟表</title>
<style>
canvas{
position: absolute;
left: 10;
top: 10;
}
</style>
</head>
<body>
<canvas id="dial_canvas"></canvas>
<canvas id="hand_canvas"></canvas>
<script>
var w = 800;
var h = 600;
var r = 200;
var dial_canvas = document.getElementById('dial_canvas');
var hand_canvas = document.getElementById('hand_canvas');
dial_canvas.width = w;
dial_canvas.height = h;
hand_canvas.width = w;
hand_canvas.height = h;
var dial_cxt = dial_canvas.getContext('2d');
var hand_cxt = hand_canvas.getContext('2d');
dial_cxt.beginPath();
dial_cxt.arc(w/2,h/2,r,0,Math.PI*2);
dial_cxt.lineWidth = 10;
dial_cxt.strokeStyle = '#000';
dial_cxt.stroke();
drawScale(dial_cxt,w/2,h/2,r,r-20,12,10);
drawScale(dial_cxt,w/2,h/2,r,r-10,60,2);
function run(){
var date = new Date();
hand_cxt.clearRect(0,0,w,h);
var seconds = date.getSeconds();
drawHand(hand_cxt, w/2, h/2, seconds / 60 * 360, 180, 2, "red");
var minutes = date.getMinutes()+seconds / 60;
drawHand(hand_cxt,w/2,h/2,minutes/60*360,150,5,"#000");
var hours = date.getHours()%12 + minutes / 60;
drawHand(hand_cxt, w/2,h/2,hours / 12 * 360,120,8,"#000");
setTimeout(run,1000);
}
run();
function drawHand(cxt, x, y, angle, length, lineWidth=8, strokeStyle="#000"){
cxt.save();
cxt.beginPath();
cxt.translate(x,y);
cxt.rotate((angle - 90)/180 * Math.PI);
cxt.moveTo(-20,0);
cxt.lineTo(length,0);
cxt.lineWidth = lineWidth;
cxt.strokeStyle = strokeStyle;
cxt.stroke();
cxt.restore();
}
function drawScale(cxt,x,y,innerRadius,outerRadius, number = 12, lineWidth = 10, strokeStyle = "#000"){
var angle = 0;
var angleDiff = 360 / number;
for (var i = 0; i < number; i ++) {
var x1 = Math.cos(angle / 180 * Math.PI) * outerRadius + w/2;
var y1 = Math.sin(angle / 180 * Math.PI) * outerRadius + h/2;
var x2 = Math.cos(angle / 180 * Math.PI) * innerRadius + w/2;
var y2 = Math.sin(angle / 180 * Math.PI) * innerRadius + h/2;
cxt.beginPath();
cxt.moveTo(x1, y1);
cxt.lineTo(x2, y2);
cxt.lineWidth = lineWidth;
cxt.strokeStyle = strokeStyle
cxt.stroke();
angle += angleDiff;
}
}
</script>
</body>
</html>
canvas画布钟表
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