How to draw a clock on canvas

This article introduces how to draw a clock on canvas and shares it with everyone. The details are as follows:

The rendering is

Above code:

 var canvas = document.getElementById('canvas');var ctx = canvas.getContext('2d');var year,month,day,hour,second,minute;//Draw the dial 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();}// Scale function drawClockHours(){ when drawing *Math.PI); ctx.beginPath(); ctx.lineWidth = 5; ctx.strokeStyle = '#333'; ctx.moveTo(0,-140); ctx.lineTo(0,-125); ctx.stroke(); ctx.closePath(); ctx.restore(); }}// Draw subscales 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(); }}// Draw hour hand 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( );}// Draw minute hand 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();}// Draw the second hand 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();}// Draw time text function drawText() { hour = hour >= 12 ? hour - 12 : hour; var time = 'Now is' + year + 'year' + month + 'month' + day + 'day' + hour + 'hour' + minute + 'minute' + second + 'second'; ctx.font = '15px bold'; ctx.fillText(time,24,350);}// Get time 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);

Of course, the time does not need to be obtained every second, but can be obtained directly once and incremented by seconds.

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