JS+Canvas绘制时钟效果

web前端|js教程

js Canvas 时钟

web前端-js教程

本文实例为大家分享了使用canvas绘制时钟的具体代码，供大家参考，具体内容如下

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1. clock.html

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var canvas=document.getElementById("canvas"); var context=canvas.getContext(2d); //draw(); function draw(){//得到当前系统的时分秒var now=new Date();var sec=now.getSeconds();var min=now.getMinutes();var hour=now.getHours();hour>=12&&(hour=hour-12);var radius = Math.min(canvas.width/2,canvas.height/2);//初始化画布context.save();context.clearRect(0,0,canvas.width,canvas.height); context.translate(canvas.width/2,canvas.height/2); context.rotate(-Math.PI/2);context.save();//表框//小时刻度context.strokeStyle="black";context.fillStyle="black";context.lineWidth=3;context.lineCap="round";context.beginPath();for(var i=0;i<12;i++){ context.rotate(Math.PI/6); context.moveTo(radius-30,0); context.lineTo(radius-10,0); }context.stroke();context.restore();context.save(); //分钟刻度context.lineWidth=2;context.beginPath();for(var i=0;i<60;i++){ if(!i%5==0){ context.moveTo(radius-15,0); context.lineTo(radius-10,0); } context.rotate(Math.PI/30);}context.stroke();context.restore();context.save(); //画上时针 context.rotate((Math.PI/6)*hour+(Math.PI/360)*min+(Math.PI/21600)*sec); context.lineWidth=6; context.beginPath(); context.moveTo(-10,0); context.lineTo(radius*0.5,0); context.stroke();context.restore();context.save(); context.rotate((Math.PI/30)*min+(Math.PI/1800)*sec); context.strokeStyle="#29A8DE"; context.lineWidth=4; context.lineCap="butt"; context.beginPath(); context.moveTo(-20,0); context.lineTo(radius*0.7,0); context.stroke(); context.restore(); context.save();context.rotate(sec*Math.PI/30); context.strokeStyle="red"; context.lineWidth=2; context.lineCap="butt"; context.beginPath(); context.moveTo(-30,0); context.lineTo(radius*0.9,0); context.stroke(); context.restore(); context.save(); context.lineWidth=4; context.strokeStyle="gray";context.beginPath(); context.arc(0,0,radius,0,Math.PI*2,true);context.stroke();context.restore(); context.restore(); }window.onload=function(){setInterval(draw,1000) }

2. JavaScript代码

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var canvas=document.getElementById("canvas"); var context=canvas.getContext(2d); //draw(); function draw(){//得到当前系统的时分秒var now=new Date();var sec=now.getSeconds();var min=now.getMinutes();var hour=now.getHours();hour>=12&&(hour=hour-12);var radius = Math.min(canvas.width/2,canvas.height/2);//初始化画布context.save();context.clearRect(0,0,canvas.width,canvas.height); context.translate(canvas.width/2,canvas.height/2); context.rotate(-Math.PI/2);context.save();//表框//小时刻度context.strokeStyle="black";context.fillStyle="black";context.lineWidth=3;context.lineCap="round";context.beginPath();for(var i=0;i<12;i++){ context.rotate(Math.PI/6); context.moveTo(radius-30,0); context.lineTo(radius-10,0); }context.stroke();context.restore();context.save(); //分钟刻度context.lineWidth=2;context.beginPath();for(var i=0;i<60;i++){ if(!i%5==0){ context.moveTo(radius-15,0); context.lineTo(radius-10,0); } context.rotate(Math.PI/30);}context.stroke();context.restore();context.save(); //画上时针 context.rotate((Math.PI/6)*hour+(Math.PI/360)*min+(Math.PI/21600)*sec); context.lineWidth=6; context.beginPath(); context.moveTo(-10,0); context.lineTo(radius*0.5,0); context.stroke();context.restore();context.save(); context.rotate((Math.PI/30)*min+(Math.PI/1800)*sec); context.strokeStyle="#29A8DE"; context.lineWidth=4; context.lineCap="butt"; context.beginPath(); context.moveTo(-20,0); context.lineTo(radius*0.7,0); context.stroke(); context.restore(); context.save();context.rotate(sec*Math.PI/30); context.strokeStyle="red"; context.lineWidth=2; context.lineCap="butt"; context.beginPath(); context.moveTo(-30,0); context.lineTo(radius*0.9,0); context.stroke(); context.restore(); context.save(); context.lineWidth=4; context.strokeStyle="gray";context.beginPath(); context.arc(0,0,radius,0,Math.PI*2,true);context.stroke();context.restore(); context.restore(); }window.onload=function(){setInterval(draw,1000) }

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