[英]Line through a Circle Javascript
試圖通過圓畫一條線
例如: https : //imgur.com/wk9lAwD
這是我的代碼: https : //codepen.io/ethan-horrigan/pen/OrRLXx
var r = 200;
var x1 = 800 / 2;
var y1 = 540 / 2;
var x = r * Math.cos(Math.PI / 180 * 135) + x1;
var y = r * Math.sin(Math.PI / 180 * 315) + y1;
ctx.beginPath();
ctx.arc(x1, y1, r, 0, Math.PI * 2, false);
ctx.moveTo(x1,y1);
ctx.lineTo(x, y);
ctx.stroke();
var r = 200;
var x1 = 800 / 2;
var y1 = 540 / 2;
var x = r * Math.cos(Math.PI * .75) + x1;
var y = r * Math.sin(Math.PI * 1.75) + y1;
ctx.beginPath();
ctx.arc(x1, y1, r, Math.PI * .25, Math.PI * 2.25, false);
ctx.lineTo(x, y);
ctx.stroke();
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