Revision of Point-on-sphere

1 file changed, 17 insertions

point-on-sphere.js(file created)

		@@ -0,0 +1,17 @@
1	+	// Get angle on circle from mouse position
2	+	function getAngleOnCircleFromOffsetMouse(evt) {
3	+	const x = (evt.pageX - element.offset().left);
4	+	const y = (evt.pageY - element.offset().top);
5	+
6	+	// https://math.stackexchange.com/a/127615
7	+	const center = { x: width / 2, y: width / 2 };
8	+	const xCenter = (x - center.x);
9	+	const yCenter = (y - center.y);
10	+	const circlePoint = {
11	+	x: center.x + radius * (xCenter / Math.sqrt(xCenter * xCenter + yCenter * yCenter)),
12	+	y: center.y + radius * (yCenter / Math.sqrt(xCenter * xCenter + yCenter * yCenter)),
13	+	};
14	+
15	+	const angle = Math.atan2(circlePoint.y - center.y, circlePoint.x - center.x) + Math.PI / 2;
16	+	return angle < 0 ? Math.PI * 2 - Math.abs(angle) : angle;
17	+	}

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