canvas简易时钟例子

tech2024-07-25 56

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>钟表</title> <script type="text/javascript"> window.onload=function(){ //1.获取画布 var canvas=document.getElementById("canvas"); //2.获取上下文对象（获取画笔） var cx=canvas.getContext("2d"); //3.设置画笔样式 function clock(){ cx.fillStyle="tomato"; //4.绘制图形 //绘制表盘 cx.beginPath(); //绘制圆形 cx.arc(300,300,200,0,Math.PI*2);//设置圆 arc（x,y,r,begin,end,c）;x,y:圆的圆的圆心坐标 r：圆的半径 begin，end：开始角度和结束角度；Math.PI=180 Math.PI/180=1度 c：是否按照逆时针进行绘制true：按照逆时 false：顺时针 cx.closePath();//关闭路径 cx.fill();// //绘制时刻度 cx.lineWidth=2; cx.strokeStyle="black"; for(var i=0;i<12;i++){ cx.save(); cx.translate(300,300);//形移 cx.rotate(i*(Math.PI/6)); cx.beginPath(); cx.moveTo(0,-180); cx.lineTo(0,-200); cx.stroke(); cx.closePath(); cx.fillStyle="black";//绘制数字 cx.font="16px blod"; cx.rotate(Math.PI/6); cx.fillText(i+1,-6,-220);//文字 cx.restore(); } //绘制分刻度 for(var i=0;i<60;i++){ cx.save(); cx.translate(300,300); cx.rotate(i*(Math.PI/30)); cx.beginPath(); cx.moveTo(0,-190); cx.lineTo(0,-200); cx.stroke(); cx.closePath(); cx.restore(); } //获取当前时间 var today=new Date(); var hour=today.getHours(); var min=today.getMinutes(); var sec=today.getSeconds(); hour=hour+min/60; //绘制时针 cx.lineWidth=4; cx.save(); cx.translate(300,300); cx.beginPath(); cx.rotate(hour*(Math.PI/6));//旋转 cx.moveTo(0,10); cx.lineTo(0,-130); cx.closePath(); cx.stroke(); cx.restore(); //回滚 //绘制分针 cx.lineWidth=2; cx.save(); cx.translate(300,300); cx.beginPath(); cx.rotate(min*(Math.PI/30)); cx.moveTo(0,10); cx.lineTo(0,-160); cx.closePath(); cx.stroke(); cx.restore(); //回滚 //绘制秒针 cx.lineWidth=1; cx.strokeStyle="black"; cx.save(); cx.translate(300,300); cx.beginPath(); cx.rotate(sec*(Math.PI/30)); cx.moveTo(0,10); cx.lineTo(0,-160); cx.closePath(); cx.stroke(); cx.restore(); //绘制交叉处 cx.fillStyle='#ccc'; cx.strokeStyle="red"; cx.save(); cx.translate(300,300); cx.beginPath(); cx.beginPath(); cx.arc(0,0,4,0,Math.PI*2); cx.closePath(); cx.fill(); cx.closePath(); cx.stroke(); cx.restore(); setTimeout(clock,1000); } // setInterval(clock,1000); clock(); } </script> </head> <body> <canvas id="canvas" width="1300px" height="600px" style="background-color: #ccc;"></canvas> </body> </html>

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