js Canvas绘制圆形时钟效果
本文实例为大家分享了jsCanvas圆形时钟的具体实现代码,供大家参考,具体内容如下
<!DOCTYPEhtml> <html> <head> <metacharset="utf-8"/> <title>CanvasClock</title> <styletype="text/css"> div{ text-align:center; margin-top:250px; } #clock{ border:1pxsolid#ccc; } </style> </head> <body> <div> <canvasid="clock"height="200px"width="200px"></canvas> </div> <scripttype="text/javascript"src="js/clock.js"></script> </body> </html>
js
vardom=document.getElementById('clock'); varcxt=dom.getContext("2d"); varwidth=cxt.canvas.width; varheight=cxt.canvas.height; varr=width/2; functiondrawBackground(){ cxt.save(); cxt.translate(r,r); cxt.beginPath(); cxt.lineWidth=10; cxt.arc(0,0,r-5,0,2*Math.PI,false); cxt.stroke(); cxt.font="18pxArial"; cxt.textAlign='center' cxt.textBaseline='middle' varhourNums=[3,4,5,6,7,8,9,10,11,12,1,2]; hourNums.forEach(function(number,i){ varrad=2*Math.PI/12*i; varx=Math.cos(rad)*(r-30); vary=Math.sin(rad)*(r-30); cxt.fillText(number,x,y); }); for(vari=0;i<60;i++){ varrad=2*Math.PI/60*i; varx=Math.cos(rad)*(r-18); vary=Math.sin(rad)*(r-18); cxt.beginPath(); if(i%5===0){ cxt.fillStyle="#000" cxt.arc(x,y,2,0,2*Math.PI,false); } else{ cxt.fillStyle="#ccc" cxt.arc(x,y,2,0,2*Math.PI,false); } cxt.fill(); } } functiondrawHour(hour,minute){ cxt.save(); cxt.beginPath(); varrad=2*Math.PI/12*hour; varmrad=2*Math.PI/12/60*minute cxt.rotate(rad+mrad); cxt.lineWidth=6; cxt.lineCap='round' cxt.moveTo(0,10); cxt.lineTo(0,-r/2); cxt.stroke(); cxt.restore(); } functiondrawMinute(minute){ cxt.save(); cxt.beginPath(); varrad=2*Math.PI/60*minute; cxt.rotate(rad); cxt.lineWidth=3; cxt.lineCap='round' cxt.moveTo(0,10); cxt.lineTo(0,-r+30); cxt.stroke(); cxt.restore(); } functiondrawSecond(second){ cxt.save(); cxt.beginPath(); cxt.fillStyle='#c14543' varrad=2*Math.PI/60*second; cxt.rotate(rad); cxt.moveTo(-2,20); cxt.lineTo(2,20); cxt.lineTo(1,-r+18); cxt.lineTo(-1,-r+18); cxt.fill(); cxt.restore(); } functiondrawDot(){ cxt.beginPath(); cxt.fillStyle='#fff' cxt.arc(0,0,3,0,2*Math.PI,false); cxt.fill(); } functiondraw(){ cxt.clearRect(0,0,width,height); varnow=newDate(); varhour=now.getHours(); varminute=now.getMinutes(); varsecond=now.getSeconds(); drawBackground(); drawHour(hour,minute); drawMinute(minute); drawSecond(second); drawDot(); cxt.restore(); } draw(); setInterval(draw,1000);
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持毛票票。