86 lines
2.0 KiB
JavaScript
86 lines
2.0 KiB
JavaScript
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function renderTime(){
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var canvas = document.getElementById("canvas");
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var ctx = canvas.getContext("2d");
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var radius = canvas.height / 2;
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ctx.translate(radius, radius);
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radius = radius * 0.90;
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function drawFace(ctx, radius) {
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var grad;
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ctx.beginPath();
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ctx.arc(0, 0, radius, 0, 2*Math.PI);
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ctx.fillStyle = 'white';
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ctx.fill();
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grad = ctx.createRadialGradient(0,0,radius*0.95, 0,0,radius*1.05);
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grad.addColorStop(0, '#333');
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grad.addColorStop(0.5, 'white');
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grad.addColorStop(1, '#333');
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ctx.strokeStyle = grad;
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ctx.lineWidth = radius*0.1;
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ctx.stroke();
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ctx.beginPath();
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ctx.arc(0, 0, radius*0.1, 0, 2*Math.PI);
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ctx.fillStyle = '#333';
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ctx.fill();
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}
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function drawNumbers(ctx, radius) {
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var ang;
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var num;
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ctx.font = radius*0.15 + "px arial";
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ctx.textBaseline="middle";
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ctx.textAlign="center";
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for(num = 1; num < 13; num++){
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ang = num * Math.PI / 6;
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ctx.rotate(ang);
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ctx.translate(0, -radius*0.85);
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ctx.rotate(-ang);
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ctx.fillText(num.toString(), 0, 0);
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ctx.rotate(ang);
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ctx.translate(0, radius*0.85);
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ctx.rotate(-ang);
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}
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}
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function drawHand(ctx, pos, length, width) {
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ctx.beginPath();
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ctx.lineWidth = width;
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ctx.lineCap = "round";
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ctx.moveTo(0,0);
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ctx.rotate(pos);
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ctx.lineTo(0, -length);
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ctx.stroke();
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ctx.rotate(-pos);
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}
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function drawTime(ctx, radius){
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var now = new Date();
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var hour = now.getHours();
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var minute = now.getMinutes();
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var second = now.getSeconds();
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//hour
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hour=hour%12;
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hour=(hour*Math.PI/6)+(minute*Math.PI/(6*60))+(second*Math.PI/(360*60));
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drawHand(ctx, hour, radius*0.5, radius*0.07);
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//minute
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minute=(minute*Math.PI/30)+(second*Math.PI/(30*60));
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drawHand(ctx, minute, radius*0.8, radius*0.07);
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// second
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second=(second*Math.PI/30);
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drawHand(ctx, second, radius*0.9, radius*0.02);
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}
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function drawClock() {
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drawFace(ctx, radius);
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drawNumbers(ctx, radius);
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drawTime(ctx, radius);
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}
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setInterval(drawClock, 1000);
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} |