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clock.js
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78 lines (70 loc) · 1.5 KB
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function renderClock(ctx){
var now = new Date();
ctx.save();
ctx.clearRect(0,0,150,150);
ctx.translate(75,75);
ctx.scale(0.4,0.4);
ctx.rotate(-Math.PI/2);
ctx.strokeStyle = "black";
ctx.fillStyle = "white";
ctx.lineWidth = 8;
ctx.lineCap = "round";
// Hour marks
ctx.save();
ctx.beginPath();
for (var i=0;i<12;i++){
ctx.rotate(Math.PI/6);
ctx.moveTo(100,0);
ctx.lineTo(120,0);
}
ctx.stroke();
ctx.restore();
// Minute marks
ctx.save();
ctx.lineWidth = 5;
ctx.beginPath();
for (i=0;i<60;i++){
if (i%5!=0) { // 5 minutes
ctx.moveTo(117,0);
ctx.lineTo(120,0);
}
ctx.rotate(Math.PI/30);
}
ctx.stroke();
ctx.restore();
var sec = now.getSeconds();
var min = now.getMinutes();
var hr = now.getHours();
hr = hr>=12 ? hr-12 : hr;
ctx.fillStyle = "black";
// write Hours
ctx.save();
ctx.rotate( hr*(Math.PI/6) + (Math.PI/360)*min + (Math.PI/21600)*sec )
ctx.lineWidth = 14;
ctx.beginPath();
ctx.moveTo(-20,0);
ctx.lineTo(80,0);
ctx.stroke();
ctx.restore();
// write Minutes
ctx.save();
ctx.rotate( (Math.PI/30)*min + (Math.PI/1800)*sec )
ctx.lineWidth = 10;
ctx.beginPath();
ctx.moveTo(-28,0);
ctx.lineTo(112,0);
ctx.stroke();
ctx.restore();
// Write seconds
ctx.save();
ctx.rotate(sec * Math.PI/30);
ctx.strokeStyle = "#D40000";
ctx.fillStyle = "#D40000";
ctx.lineWidth = 6;
ctx.beginPath();
ctx.moveTo(-30,0);
ctx.lineTo(83,0);
ctx.stroke();
ctx.restore();
ctx.restore();
}