[代码收集]canvas实现时钟效果 - 笑忘书网页代码收藏馆

首页-代码 2013-10-10 07:05:55 -0400

★canvas实现时钟效果★

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代码说明

模拟时钟效果，实现秒针转动。很棒的效果。转自红黑联盟

html代码

<canvas id="clock" width="500" height="500" style="background-color:black;">你的浏览器不支持canvas</canvas>
    <script type="text/javascript">
       var canvas = document.getElementById("clock");
       var cxt = canvas.getContext("2d");
       function drawClock() {
       var now = new Date();
       var sec = now.getSeconds();
       var min = now.getMinutes();
       var hour = now.getHours();
       hour > 12 ? hour - 12 : hour;
       hour += (min / 60);
       //先清空画布
       cxt.clearRect(0, 0, canvas.width, canvas.height);

//美女图片作为表盘背景，替换tw.png即可    
       var img = new Image();
       img.src = "tw.png";
       cxt.drawImage(img, 46, 46);
       //img.onload = function () {
       //    cxt.drawImage(img, 0, 0);
       //}
       //画表盘大圆 圆心：x=250 y=250
       cxt.strokeStyle = "#00FFFF";
       cxt.lineWidth = 10;
       cxt.beginPath();
       cxt.arc(250, 250, 200, 0, 360);
       cxt.stroke();
       cxt.closePath();
       //时刻度
       for (var i = 0; i < 12; i++) {
       cxt.save();//保存当前状态
       cxt.lineWidth = 7;
       cxt.strokeStyle = "#FFFF00";
       //设置原点
       cxt.translate(250, 250);
       //设置旋转角度
       cxt.rotate(30 * i * Math.PI / 180);//弧度   角度*Math.PI/180
       cxt.beginPath();
       cxt.moveTo(0, -175);
       cxt.lineTo(0, -195);
       cxt.stroke();
       cxt.closePath();
       cxt.restore();//把原来状态恢复回来
       }
       //分刻度
       for (var i = 0; i < 60; i++) {
       cxt.save();
       cxt.lineWidth = 5;
       cxt.strokeStyle = "#FFFF00";
       cxt.translate(250, 250);
       cxt.rotate(i * 6 * Math.PI / 180);
       cxt.beginPath();
       cxt.moveTo(0, -185);
       cxt.lineTo(0, -195);
       cxt.stroke();
       cxt.closePath();
       cxt.restore();
       }

//以下的时针、分针、秒针均要转动，所以在这里要设置其异次元空间的位置
       //根据当前的小时数、分钟数、秒数分别设置各个针的角度即可
       //-----------------------------时针-----------------------------
       cxt.save();
       cxt.lineWidth = 7;
       cxt.strokeStyle = "#00FFFF";
       cxt.translate(250, 250);
       cxt.rotate(hour * 30 * Math.PI / 180);//每小时旋转30度
       cxt.beginPath();
       cxt.moveTo(0, -130);
       cxt.lineTo(0, 10);
       cxt.stroke();
       cxt.closePath();
       cxt.restore();
       //-----------------------------分针-----------------------------
       cxt.save();
       cxt.lineWidth = 5;
       cxt.strokeStyle = "#FFFF00";
       cxt.translate(250, 250);
       cxt.rotate(min * 6 * Math.PI / 180);//每分钟旋转6度
       cxt.beginPath();
       cxt.moveTo(0, -150);
       cxt.lineTo(0, 10);
       cxt.stroke();
       cxt.closePath();
       cxt.restore();
       //-----------------------------秒针-----------------------------
       cxt.save();
       cxt.lineWidth = 3;
       cxt.strokeStyle = "#FF0000";
       cxt.translate(250, 250);
       cxt.rotate(sec * 6 * Math.PI / 180);//每秒旋转6度
       cxt.beginPath();
       cxt.moveTo(0, -170);
       cxt.lineTo(0, 10);
       cxt.stroke();
       cxt.closePath();

//美化表盘，画中间的小圆
       cxt.beginPath();
       cxt.arc(0, 0, 7, 0, 360);
       cxt.fillStyle = "#FFFF00";
       cxt.fill();
       cxt.strokeStyle = "#FF0000";
       cxt.stroke();
       cxt.closePath();
       //秒针上的小圆
       cxt.beginPath();
       cxt.arc(0, -140, 7, 0, 360);
       cxt.fillStyle = "#FFFF00";
       cxt.fill();
       cxt.stroke();
       cxt.closePath();
       cxt.restore();

//显示时间
       cxt.font = "18px 微软雅黑";
       cxt.lineWidth = 2;
       cxt.fillStyle = "#0000FF";
       hour=now.getHours();
       var str = hour > 10 ? hour : ("0" + hour) + ":" + (min > 10 ? min : ("0" + min))
       cxt.fillText(str, 225, 380);
       //中国制造
       cxt.font = "12px 宋体";
       cxt.lineWidth = 1;
       cxt.fillText("Made In China", 210, 400);
       }
       drawClock();
       setInterval(drawClock, 1000);
    </script>

代码演示

[代码仅供参考，转载请注明出处]

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