Example of canvas--clock animation-H5 Tutorial-php.cn

Usually when the company is not busy, I like to write about some small effects and so on. Firstly, I can review and review, and secondly, I can find some problems.

Today I saw someone posting a picture of a watch in the group. Damn it... I have been working properly for many years. Then I thought about it and just do my own thing well. , thinking about what to do, I drew a watch....

Directly enter the code:

html

canvas clock

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var clock=(function(){function _canvasClock(){var cvs=document.getElementById('canvas');var ctx=cvs.getContext('2d');var PI=Math.PI;var lineWidth=5; //线宽var gradient=ctx.createLinearGradient(10,10,580,580); //设置圆的颜色渐变gradient.addColorStop("0","#a251ff"); gradient.addColorStop(1,"#2ec2ff"); ctx.fillStyle = '#ef6670'; ctx.fillRect(0,0,600,600);var drawBig=function(){var time=new Date();var second=time.getSeconds(); //秒var Minute=time.getMinutes(); //分var hour=time.getHours(); //时//hour=hour+Minute/60;hour=hour>12?hour-12:hour; //表盘只有12小时 ctx.clearRect(0,0,600,600); //清空给定矩形内的指定像素//画圆 ctx.beginPath(); ctx.lineWidth=lineWidth; ctx.strokeStyle=gradient; ctx.arc(300,300,290,0, PI * 2,false); ctx.stroke(); ctx.closePath(); ctx.beginPath(); ctx.lineWidth=lineWidth; ctx.strokeStyle=gradient; ctx.arc(300,300,10,0, PI * 2,false); ctx.stroke(); ctx.closePath(); for(var i=0;i<60;i++){ ctx.save(); 　//保存之前画布状态 ctx.lineWidth=4; 　　 //设置分针的粗细 ctx.strokeStyle="#616161"; //设置分针的颜色 ctx.translate(300,300); //画布圆点设置 ctx.rotate(i*PI/30); //角度*Math.PI/180=弧度,设置旋转角度 ctx.beginPath(); //开始一条路径ctx.moveTo(0,-287); //相对画布圆点路径的起点ctx.lineTo(0,-283); //相对画布圆点路径的终点ctx.closePath(); //结束一条路径ctx.stroke(); //实际地绘制出通过 moveTo()和 lineTo()方法定义的路径ctx.restore(); //restore() 方法将绘图状态置为保存值 } for(var i=0;i<12;i++){ ctx.save(); ctx.lineWidth=4; ctx.strokeStyle=gradient; ctx.translate(300,300); ctx.rotate(i*PI/6); ctx.beginPath(); ctx.moveTo(0,-287); ctx.lineTo(0,-278); ctx.closePath(); ctx.stroke(); ctx.restore(); } //时针 ctx.save(); ctx.lineWidth=3; ctx.strokeStyle="#0f0f0f"; ctx.translate(300,300); ctx.rotate(hour*PI/6+second*PI/108000); ctx.beginPath(); ctx.moveTo(0,-238); ctx.lineTo(0,10); ctx.closePath(); ctx.stroke(); ctx.restore(); //分针 ctx.save(); ctx.lineWidth=3; ctx.strokeStyle="#010101"; ctx.translate(300,300); ctx.rotate(Minute*PI/30+second*PI/1800); ctx.beginPath(); ctx.moveTo(0,-258); ctx.lineTo(0,15); ctx.closePath(); ctx.stroke(); ctx.restore(); //秒针 ctx.save(); ctx.strokeStyle="#ff100d"; ctx.lineWidth=3; ctx.translate(300,300); ctx.rotate(second*PI/30); ctx.beginPath(); ctx.moveTo(0,-278); ctx.lineTo(0,20); ctx.closePath(); ctx.stroke(); ctx.beginPath(); //时针分针秒针交点 ctx.arc(0,0,6,0,2*PI,false); ctx.closePath(); ctx.fillStyle="#fff"; ctx.fill(); ctx.stroke(); ctx.restore(); requestAnimationFrame(drawBig); //实现动画修改的接口 }; drawBig(); setInterval(drawBig,1000); //每1s重绘一次 };return{ canvasClock:_canvasClock, } }())

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I originally planned to encapsulate it, but when I got off work, I came to do the task and it flew away. ...

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