canvas如何繪製鐘錶的方法_html5教程技巧

來源:互聯網
上載者:User
這篇文章主要介紹了HTML5中的canvas如何繪製鐘錶的方法的相關資料,小編覺得HTML真的是越來越強大的,現在分享給大家,也給大家做個參考。對HTML的小夥伴們可以一起跟隨小編過來看看吧

本文介紹了canvas如何繪製鐘錶的方法,分享給大家,具體如下:

上代碼:


var canvas = document.getElementById('canvas');var ctx = canvas.getContext('2d');var year,month,day,hour,second,minute;// 繪製錶盤function drawClockPie(){    ctx.beginPath();    ctx.lineWidth = 2;    ctx.strokeStyle = '#333';    ctx.arc(150,150,146,0,2*Math.PI);    ctx.stroke();    ctx.closePath();    ctx.beginPath();    ctx.arc(150,150,6,0,2*Math.PI);    ctx.fillStyle = 'red';    ctx.fill();    ctx.closePath();}// 繪製時刻度function drawClockHours(){    for(var i = 0,l = 12; i < 12; i++){        ctx.save();        ctx.translate(150,150);        ctx.rotate(i*1/12*2*Math.PI);        ctx.beginPath();        ctx.lineWidth = 5;        ctx.strokeStyle = '#333';        ctx.moveTo(0,-140);        ctx.lineTo(0,-125);        ctx.stroke();        ctx.closePath();        ctx.restore();    }}// 繪製分刻度function drawClockMins(){    for(var i = 0,l = 60; i < 60; i++){        ctx.save();        ctx.translate(150,150);        ctx.rotate(i*1/60*2*Math.PI);        ctx.beginPath();        ctx.lineWidth = 3;        ctx.strokeStyle = '#333';        ctx.moveTo(0,-140);        ctx.lineTo(0,-133);        ctx.stroke();        ctx.closePath();        ctx.restore();    }}// 繪製時針function drawHourPin(){    ctx.save();    ctx.translate(150,150);    ctx.rotate((hour*60*60+minute*60+second)/(12*60*60)*2*Math.PI);    ctx.beginPath();    ctx.strokeStyle = '#333';    ctx.lineWidth = 3;    ctx.moveTo(0,0);    ctx.lineTo(0,-40);    ctx.stroke();    ctx.closePath();    ctx.restore();}// 繪製分針function drawMinPin(){    ctx.save();    ctx.translate(150,150);    ctx.rotate((minute*60+second)/(60*60)*2*Math.PI);    ctx.beginPath();    ctx.strokeStyle = '#333';    ctx.lineWidth = 2;    ctx.moveTo(0,0);    ctx.lineTo(0,-60);    ctx.stroke();    ctx.closePath();    ctx.restore();}// 繪製秒針function drawSecPin(){    ctx.save();    ctx.translate(150,150);    ctx.rotate(second/60*2*Math.PI);    ctx.beginPath();    ctx.strokeStyle = 'red';    ctx.lineWidth = 1;    ctx.moveTo(0,0);    ctx.lineTo(0,-80);    ctx.stroke();    ctx.closePath();    ctx.restore();}// 繪製時間文字function drawText(){    hour = hour >= 12 ? hour - 12 : hour;    var time = '現在是' + year + '年' + month +    '月' + day + '日' + hour + '時' + minute +    '分' + second + '秒';    ctx.font = '15px 黑體';    ctx.fillText(time,24,350);}// 擷取時間function getTimes(){    var date = new Date();    year = date.getFullYear();    month = date.getMonth() + 1;    day = date.getDate();    hour = date.getHours();    minute = date.getMinutes();    second = date.getSeconds();}setInterval(function(){    ctx.clearRect(0,0,600,600);    drawClockPie();    drawClockHours();    drawClockMins();    getTimes();    drawText();    drawHourPin();    drawMinPin();    drawSecPin();},1000);


註:

當然時間也可以不用這樣每隔一秒就擷取,直接擷取一次按秒遞增就行。

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