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setInterval.html
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setInterval.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>轉盤</title>
</head>
<body onload="drawClock();">
<p><select name="shift" id="shift" onchange="selectChange();">
<option value="0">C</option>
<option value="1">C#</option>
<option value="2">D</option>
<option value="3">Eb</option>
<option value="4">E</option>
<option value="5">F</option>
<option value="6">F#</option>
<option value="7">G</option>
<option value="8">G#</option>
<option value="9">A</option>
<option value="10">Bb</option>
<option value="11">B</option>
</select></p>
<canvas id="canvas" width="512" height="512" style="background-color:#DDDDDD"></canvas>
<script>
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
var radius = canvas.height / 2;
var shiftang = 0;
ctx.translate(radius, radius);
radius = radius * 0.90
//setInterval(drawClock, 1000);
function selectChange(){
shiftang = (-1) * document.getElementById("shift").value;
drawClock();
}
function drawClock() {
ctx.arc(0, 0, radius, 0 , 2*Math.PI);
ctx.fillStyle = "white";
ctx.fill();
}
function drawClock() {
drawFace(ctx, radius);
drawNumbers(ctx, radius);
//drawTime(ctx, radius);
drawTurnTable(ctx, radius/1.5);
drawTurnNumbers(ctx, radius/1.5);
}
function drawNumbers(ctx, radius) {
var ang;
var num;
ctx.font = radius*0.15 + "px arial";
ctx.textBaseline="middle";
ctx.textAlign="center";
var abc = ["C#", "D", "Eb", "E", "F", "F#", "G", "G#", "A", "Bb", "B", "C"];
for(num= 1; num < 13; num++){
ang = num * Math.PI / 6;
ctx.rotate(ang);
ctx.translate(0, -radius*0.85);
ctx.rotate(-ang);
ctx.fillText(abc[num-1].toString(), 0, 0);
ctx.rotate(ang);
ctx.translate(0, radius*0.85);
ctx.rotate(-ang);
}
}
function drawTurnNumbers(ctx, radius) {
var ang;
var num;
ctx.font = radius*0.2 + "px arial";
ctx.textBaseline="middle";
ctx.textAlign="center";
var abc = ["Do#", "Re", "Mib", "Mi", "Fa", "Fa#", "Sol", "Sol#", "La", "Sib", "Si", "Do"];
for(num= 1; num < 13; num++){
ang = num * Math.PI / 6 + shiftang * Math.PI / 6;
ctx.rotate(ang);
ctx.translate(0, -radius*0.75);
ctx.rotate(-ang);
ctx.fillText(abc[num-1].toString(), 0, 0);
ctx.rotate(ang);
ctx.translate(0, radius*0.75);
ctx.rotate(-ang);
}
}
function drawFace(ctx, radius) {
var grad;
ctx.beginPath();
ctx.arc(0, 0, radius, 0, 2*Math.PI);
ctx.fillStyle = 'white';
ctx.fill();
grad = ctx.createRadialGradient(0,0,radius*0.95, 0,0,radius*1.05);
grad.addColorStop(0, '#333');
grad.addColorStop(0.5, 'white');
grad.addColorStop(1, '#333');
ctx.strokeStyle = grad;
ctx.lineWidth = radius*0.1;
ctx.stroke();
ctx.beginPath();
ctx.arc(0, 0, radius*0.1, 0, 2*Math.PI);
ctx.fillStyle = '#333';
ctx.fill();
}
function drawTurnTable(ctx, radius) {
var grad;
ctx.beginPath();
ctx.arc(0, 0, radius, 0, 2*Math.PI);
ctx.fillStyle = 'white';
ctx.fill();
grad = ctx.createRadialGradient(0,0,radius*0.95, 0,0,radius*1.05);
grad.addColorStop(0, '#333');
grad.addColorStop(0.5, 'white');
grad.addColorStop(1, '#333');
ctx.strokeStyle = grad;
ctx.lineWidth = radius*0.1;
ctx.stroke();
ctx.beginPath();
ctx.arc(0, 0, radius*0.1, 0, 2*Math.PI);
ctx.fillStyle = '#333';
ctx.fill();
}
</script>
</body>
</html>