js timing events. Round the clock

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js timing events. Round the clock

Your devil fairy world. Myself again
Here Insert Picture Description
renderings

Code

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8"/>
    <title>时钟</title>
    <style>
        *{margin: 0; padding: 0;}

        div.dd{
            margin: 0 auto;
            width: 400px;
            padding-top: 100px;
        }
    </style>
</head>
<body>
<div class="dd">
    <canvas id="clock" height="400px" width="400px">你的浏览器不支持canvas</canvas>
</div>
<script type="text/javascript">
    (function(doc){
        var can = doc.getElementById("clock");
        var con = can.getContext("2d");//创建一个2d上下文
        con.translate(200, 200);//重新确定坐标原点（确定圆心位置）
 
        //外圆
        con.beginPath();
        con.fillStyle = '#fff';
        con.arc(0, 0, 200, 0, Math.PI*2, false);
        con.fill();
 
        //内圆
        con.beginPath();
        con.fillStyle = '#aaa';
        con.arc(0, 0, 195, 0, Math.PI*2, false);
        con.fill();
 
        //绘制刻度
        con.beginPath();
        con.font = "bold 20px sans-serif";
        con.textAlign = "center";
        con.textBaseline = "middle"
        con.fillStyle = '#000000';
        con.fillText("12", 0, -170);
        con.fillText("3",170,0);
        con.fillText("6",0,170);
        con.fillText("9",-170,0);
        con.fillText("1",84,-147.224);
        con.fillText("2",147.224,-84);
        con.fillText("4",147.224,84);
        con.fillText("5",84,147.224);
        con.fillText("7",-84,147.224);
        con.fillText("8",-147.224,84);
        con.fillText("10",-147.224,-84);
        con.fillText("11",-84,-147.224);
 
        //获取当前时间
        var d = new Date(), time ={};
        time.H = d.getHours()%12;
        time.M = d.getMinutes();
        time.S = d.getSeconds();
 
        function getTime(){
            time.S++;
            if(time.S > 59){
                time.S = 0;
                time.M++;
                if(time.M > 60){
                    time.M = 0;
                    time.H++;
                    if(time.H > 11){
                        time.H = 0;
                    }
                }
            }
            canvasTimeLine();
        }
 
        //将角度转为弧度
        function numToDeg(num){
            return ((num*6 - 90)*0.0174444444444444);
 
        }
        //确定刻度位置
        function computePositionByLenDeg(len, deg){
            return {
                x: len*Math.cos(deg),
                y: len*Math.sin(deg)
            }
        }
        //绘制刻度
        function canvasLineMintus(){
            for(var i = 0;i<60; i++){
                var rec = 180;
                con.beginPath();
                con.lineWidth = 4;
                if(i%5 != 0){
                    con.lineWidth = 1;
                    rec = 184
                }
 
                var beinDeg = numToDeg(i),
                        beginPot = computePositionByLenDeg(rec, beinDeg),
                        endPot = computePositionByLenDeg(190, beinDeg);
                con.moveTo(beginPot.x, beginPot.y);
                con.lineTo(endPot.x, endPot.y);
                con.stroke();
            }
        }
 
        function canvasTimeLine(){
            var sDeg = numToDeg(time.S),
                    mDeg = numToDeg(time.M),
                    hDeg = numToDeg(time.H*5 + Math.floor(time.M/12)),
                    sPot = computePositionByLenDeg(150, sDeg),
                    mPot = computePositionByLenDeg(135, mDeg),
                    hPot = computePositionByLenDeg(110, hDeg);
 
            //时钟表面
            con.beginPath();
            con.fillStyle = '#ddd';
            con.arc(0, 0, 156, 0, Math.PI*2, false);
            con.fill();
 
 
 
            //时针
            con.beginPath();
            con.moveTo(0, 0);
            con.lineTo(hPot.x, hPot.y);
            con.lineWidth = 6;
            con.strokeStyle = "#333";
            con.stroke();
 
            //分针
            con.beginPath();
            con.moveTo(0, 0);
            con.lineTo(mPot.x, mPot.y);
            con.lineWidth = 4;
            con.strokeStyle = "#333";
            con.stroke();
 
            //秒针
            con.beginPath();
            con.moveTo(0, 0);
            con.lineTo(sPot.x, sPot.y);
            con.lineWidth = 2;
            con.strokeStyle = "#ff0000";
            con.stroke();
 
            //针心
            con.beginPath();
            con.fillStyle = '#aaaaaa';
            con.arc(0, 0, 8, 0, Math.PI*2, false);
            con.fill();
            con.beginPath();
            con.fillStyle = '#f00';
            con.arc(0, 0, 4, 0, Math.PI*2, false);
            con.fill();
 
        }
        canvasLineMintus();
        getTime();
 
        setInterval(getTime, 1000);
 
    })(document);
</script>
</body>
</html>

Very complicated Oh, please study hard.
Please continue to look forward to the next issue blog.
I am a fairy world.
Your the devil
Here Insert Picture Description

js timing events. Round the clock

js timing events. Round the clock

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