canvas画的时钟

结合几天来学习的canvas的API，终于完成了一个时钟呵呵

html

<!doctype html>

<html>

<head>

<meta charset="utf-8">

<title>canvas</title>

<style type="text/css">

canvas { border: 1px solid black; }

#change{width:200px; line-height:30px; color:#fff; text-align:center; background:blue;}

</style>

<script src="canvas.js" type="text/javascript" charset="utf-8"></script>

</head>

<body>

<canvas id="canvas" width="600" height="400">current stock price: $3.15 +0.15</canvas>

</html>

window.onload = function() {

    new clock();

}

function clock() {

    var canvas = document.getElementById('canvas');

    var ctx = canvas.getContext('2d');

    ctx.clearRect(0, 0, 300, 300);

    var date = new Date(); //获取当前时间

    this.hour = date.getHours();

    this.min = date.getMinutes();

    this.sec = date.getSeconds();

    this.hour = this.hour + this.min / 60;

    this.hour = this.hour > 12 ? this.hour - 12 : this.hour;

    this.radius = 115;

    this.dotX = 150;

    this.dotY = 150;

    this.maxBorderWidth = 8;

    this.minBorderWidth = 2;

    this.clockBg();

    this.drawHour();

    this.drawMin();

    this.drawSec();

    this.onreset();

}

clock.prototype.onreset = function() {

    var ctx = canvas.getContext('2d');

    ctx.clearRect(0, 0, 300, 300);

    var date = new Date(); //获取当前时间

    this.hour = date.getHours();

    this.min = date.getMinutes();

    this.sec = date.getSeconds();

    this.hour = this.hour + this.min / 60;

    this.hour = this.hour > 12 ? this.hour - 12 : this.hour;

    this.clockBg();

    this.drawHour();

    this.drawMin();

    this.drawSec();

    var self = this;

    setInterval(function() {

        self.onreset();

    }, 1000);

}

clock.prototype.clockBg = function() {

    var ctx = canvas.getContext('2d');

    ctx.beginPath();

    ctx.fillStyle = "#e3e3e3";

    ctx.arc(this.dotX, this.dotY, this.radius, 0, 2 * Math.PI, false);

    ctx.fill();

    ctx.closePath();

    for (var i = 0; i < 60; i++) {

        ctx.save();

        var pointLong;

        if (i % 5 == 0) {

            ctx.lineWidth = this.maxBorderWidth;

            pointLong = 25;

        } else {

            ctx.lineWidth = this.minBorderWidth;

            pointLong = 12;

        }

        ctx.strokeStyle = "#000";

        ctx.translate(this.dotX, this.dotY);

        ctx.rotate(i * 6 * Math.PI / 180);

        ctx.beginPath();

        ctx.moveTo(0, -this.radius + this.maxBorderWidth);

        ctx.lineTo(0, -this.radius + this.maxBorderWidth + pointLong);

        ctx.closePath();

        ctx.stroke();

        ctx.restore();

    };

}

clock.prototype.drawHour = function() {

    var ctx = canvas.getContext('2d');

    ctx.save();

    ctx.strokeStyle = "#000";

    ctx.lineWidth = this.maxBorderWidth;

    ctx.translate(this.dotX, this.dotY);

    ctx.rotate(this.hour * 30 * Math.PI / 180);

    ctx.beginPath();

    ctx.moveTo(0, 20);

    ctx.lineTo(0, -70);

    ctx.closePath();

    ctx.stroke();

    ctx.restore();

}

clock.prototype.drawMin = function () {

    var ctx = canvas.getContext('2d');

    ctx.save();

    ctx.strokeStyle = "#00";

    ctx.lineWidth = this.maxBorderWidth;

    ctx.translate(this.dotX, this.dotY);

    ctx.rotate(this.min*6*Math.PI/180);

    ctx.beginPath();

    ctx.moveTo(0, 20);

    ctx.lineTo(0, -80);

    ctx.closePath();

    ctx.stroke();

    ctx.restore();

}

clock.prototype.drawSec = function() {

    var ctx = canvas.getContext('2d');

    ctx.save();

    ctx.strokeStyle = "#f00";

    ctx.lineWidth = this.minBorderWidth;

    ctx.translate(this.dotX, this.dotY);

    ctx.rotate(this.sec * 6 * Math.PI / 180);

    ctx.beginPath();

    ctx.moveTo(0, 20);

    ctx.lineTo(0, -100);

    ctx.closePath();

    ctx.stroke();

    ctx.beginPath();

    ctx.fillStyle = "#f00";

    ctx.arc(0, 0, 5, 0, 2 * Math.PI, true);

    ctx.closePath();

    ctx.fill();

    ctx.restore();

}

function drawTime() {

    var clock = document.getElementById('canvas');

    var ctx = clock.getContext('2d');

    ctx.clearRect(0, 0, 244, 300);

    var date = new Date(); //获取当前时间

    var hour = date.getHours();

    var min = date.getMinutes();

    var sec = date.getSeconds();

    hour = hour + min / 60;

    hour = hour > 12 ? hour - 12 : hour;

    var width = 244;

    var height = 280;

    var dot = { //时钟中心

        x: width / 2,

        y: width / 2,

        radius: 4

    }

    var radius = 115;

    var maxBorderWidth = 8;

    var minBorderWidth = 2;

    //绘制时钟中心点

    ctx.lineWidth = maxBorderWidth;

    ctx.beginPath();

    ctx.fillStyle = "#e2e2e2";

    ctx.arc(dot.x, dot.y, radius, 0, 2 * Math.PI, true);

    ctx.fill();

    ctx.closePath();

    //绘制时刻度、分刻度

    for (var i = 0; i < 60; i++) {

        ctx.save();

        var pointLong;

        if (i % 5 == 0) {

            ctx.lineWidth = maxBorderWidth;

            pointLong = 25;

        } else {

            ctx.lineWidth = minBorderWidth;

            pointLong = 12;

        }

        ctx.strokeStyle = "#000";

        ctx.translate(dot.x, dot.y);

        ctx.rotate(i * 6 * Math.PI / 180);

        ctx.beginPath();

        ctx.moveTo(0, -radius + maxBorderWidth);

        ctx.lineTo(0, -radius + maxBorderWidth + pointLong);

        ctx.closePath();

        ctx.stroke();

        ctx.restore();

    }

    //绘制时针

    ctx.save();

    ctx.lineWidth = maxBorderWidth;

    ctx.translate(dot.x, dot.y);

    ctx.rotate(hour * 30 * Math.PI / 180);

    ctx.beginPath();

    ctx.moveTo(0, -55);

    ctx.lineTo(0, 25);

    ctx.closePath();

    ctx.stroke();

    ctx.restore();

    //绘制分针

    ctx.save();

    ctx.lineWidth = maxBorderWidth;

    ctx.translate(dot.x, dot.y);

    ctx.rotate(min * 6 * Math.PI / 180);

    ctx.beginPath();

    ctx.moveTo(0, -97);

    ctx.lineTo(0, 25);

    ctx.closePath();

    ctx.stroke();

    ctx.restore();

    //绘制秒针

    ctx.save();

    ctx.strokeStyle = "red";

    ctx.lineWidth = minBorderWidth;

    ctx.translate(dot.x, dot.y);

    ctx.rotate(sec * 6 * Math.PI / 180);

    ctx.beginPath();

    ctx.moveTo(0, -75);

    ctx.lineTo(0, 25);

    ctx.closePath();

    ctx.stroke();

    ctx.beginPath();

    ctx.fillStyle = '#D6231C';

    ctx.arc(0, -75, 6, 0, 2 * Math.PI, true); //绘制秒针针尖的小圆点

    ctx.fill();

    ctx.closePath();

    ctx.restore();

    //装饰时钟中心  两个小圆叠加

    ctx.beginPath();

    ctx.fillStyle = '#982127';

    ctx.arc(dot.x, dot.y, dot.radius, 0, 2 * Math.PI, true);

    ctx.fill();

    ctx.closePath();

    ctx.beginPath();

    ctx.fillStyle = '#D6231C';

    ctx.arc(dot.x, dot.y, 2, 0, 2 * Math.PI, true);

    ctx.fill();

    ctx.closePath();

    //再时钟上添加签名

    ctx.fillStyle = "#000";

    ctx.font = "15px Comic Sans MS";

    ctx.fillText("Chal Mine", dot.x - 30, dot.y + 50);

}

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canvas画的时钟

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