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| var canvas = document.querySelector("canvas");
const ctx = canvas.getContext("2d");
//檢查支援
if (canvas.getContext) {
var ctx = canvas.getContext("2d");
var radius = canvas.height / 2;
console.log('radius1',radius)
ctx.translate(radius, radius);
radius = radius * 0.90
console.log('radius2',radius * 0.90)
//每一秒執行一次函式
setInterval(drawClock, 1000);
}
function drawClock() {
drawFace(ctx, radius);
drawNumbers(ctx, radius);
drawTime(ctx, radius);
}
//塞入時鐘圖案
function drawFace(ctx, radius) {
var grad;
ctx.beginPath();
ctx.arc(0, 0, radius, 0, 2*Math.PI);
ctx.fillStyle = 'white';
ctx.fill();
ctx.strokeStyle = '#00bcd4'; //外框顏色
ctx.lineWidth = radius*0.1;
ctx.stroke();
ctx.beginPath();
ctx.arc(0, 0, radius*0.1, 0, 2*Math.PI);
ctx.fillStyle = '#00bcd4';//中心點顏色
ctx.fill();
}
//塞入1~12的字樣
function drawNumbers(ctx, radius) {
var ang;
var num;
ctx.font = radius*0.15 + "px arial";
ctx.textBaseline="middle";
ctx.textAlign="center";
for(num = 1; num < 13; num++){
ang = num * Math.PI / 6;
ctx.rotate(ang);
ctx.fillStyle = '#3333';//小時的顏色
ctx.translate(0, -radius*0.85);
ctx.rotate(-ang);
ctx.fillText(num.toString(), 0, 0);
ctx.rotate(ang);
ctx.translate(0, radius*0.85);
ctx.rotate(-ang);
}
}
function drawTime(ctx, radius){
var now = new Date();
var hour = now.getHours();
var minute = now.getMinutes();
var second = now.getSeconds();
//hour
hour=hour%12;
hour=(hour*Math.PI/6)+
(minute*Math.PI/(6*60))+
(second*Math.PI/(360*60));
drawHand(ctx, hour, radius*0.5, radius*0.07);
//minute
minute=(minute*Math.PI/30)+(second*Math.PI/(30*60));
drawHand(ctx, minute, radius*0.8, radius*0.07);
// second
second=(second*Math.PI/30);
drawHand(ctx, second, radius*0.9, radius*0.02);
}
function drawHand(ctx, pos, length, width) {
ctx.beginPath();
ctx.strokeStyle = '#3f51b5';//指針顏色
ctx.lineWidth = width;
ctx.lineCap = "round";
ctx.moveTo(0,0);
ctx.rotate(pos);
ctx.lineTo(0, -length);
ctx.stroke();
ctx.rotate(-pos);
}
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