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| <!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>时钟</title>
</head>
<canvas id="canvas"></canvas>
<script>
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
var radius = canvas.height / 2;
Init();
function Init()
{
window.addEventListener('resize', ResizeCanvas, false);
ResizeCanvas();
}
function ResizeCanvas()
{
var s = Math.min(window.innerWidth, window.innerHeight);
canvas.width = canvas.height = s;
radius = canvas.height / 2;
ctx.translate(radius, radius);
radius *= 0.8;
DrawClock();
}
setInterval(DrawClock, 1000);
function DrawClock()
{
DrawFace(ctx, radius);
DrawNumbers(ctx, radius);
DrawTime(ctx, radius);
DrawString(ctx, radius);
}
function DrawFace(ctx, radius)
{
var grad;
ctx.beginPath();
ctx.arc(0, 0, radius, 0, 2 * Math.PI);
ctx.fillStyle = 'white';
ctx.fill();
grad = ctx.createRadialGradient(0, 0, radius * 0.9, 0, 0, radius);
grad.addColorStop(0, '#333');
grad.addColorStop(0.5, 'white');
grad.addColorStop(1, '#333');
ctx.strokeStyle = grad;
ctx.lineWidth = radius * 0.1;
ctx.stroke();
ctx.beginPath();
ctx.arc(0, 0, radius * 0.1, 0, 2 * Math.PI);
ctx.fillStyle = '#333';
ctx.fill();
}
function DrawNumbers(ctx, radius)
{
ctx.font = radius * 0.2 + "px arial";
ctx.textBaseline = "middle";
ctx.textAlign = "center";
for (var num = 1; num <= 12; num++)
{
var ang = num * Math.PI / 6;
ctx.rotate(ang);
ctx.translate(0, -radius * 0.8);
ctx.rotate(-ang);
ctx.fillText(num.toString(), 0, 0);
ctx.rotate(ang);
ctx.translate(0, radius * 0.8);
ctx.rotate(-ang);
}
}
function DrawHand(ctx, pos, length, width)
{
ctx.beginPath();
ctx.lineWidth = width;
ctx.lineCap = "round";
ctx.moveTo(0, 0);
ctx.rotate(pos);
ctx.lineTo(0, -length);
ctx.stroke();
ctx.rotate(-pos);
}
function DrawTime(ctx, radius)
{
var date = new Date();
var hour = date.getHours();
var minute = date.getMinutes();
var second = date.getSeconds();
hour = hour % 12;
hour = (hour * Math.PI / 6) + (minute * Math.PI / (6 * 60)) + (second * Math.PI / (360 * 60));
DrawHand(ctx, hour, radius * 0.5, radius * 0.05);
minute = (minute * Math.PI / 30) + (second * Math.PI / (30 * 60));
DrawHand(ctx, minute, radius * 0.8, radius * 0.03);
second = (second * Math.PI / 30);
DrawHand(ctx, second, radius * 0.9, radius * 0.02);
}
function DrawString(ctx, radius)
{
ctx.translate(0, -radius * 0.25);
ctx.font = radius * 0.1 + "px arial";
ctx.textBaseline = "middle";
ctx.textAlign = "center";
var date = new Date();
var s = date.getFullYear().toString() + "-"
+ (date.getMonth() + 1).toString() + "-"
+ date.getDate().toString() + " "
+ "星期 " + date.getDay().toString() + " "
+ date.getHours().toString() + ":"
+ date.getMinutes().toString() + ":"
+ date.getSeconds().toString();
ctx.fillText(s, 0, 0);
ctx.translate(0, radius * 0.25);
}
</script>
</html>
|
