Exploring the concept of drawing a line through a circle
Example image: https://i.sstatic.net/I8B60.jpg
Check out my code snippet: 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();
I think this is the solution you're looking for:
ctx.moveTo(x, y);
ctx.lineTo(x1 + (x1 - x), y1 + (y1 - y));
ctx.stroke();
let radius = 200;
let centerX = 800 / 2;
let centerY = 540 / 2;
let xCoord = radius * Math.cos(Math.PI * .75) + centerX;
let yCoord = radius * Math.sin(Math.PI * 1.75) + centerY;
context.beginPath();
context.arc(centerX, centerY, radius, Math.PI * .25, Math.PI * 2.25, false);
context.lineTo(xCoord, yCoord);
context.stroke();
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