25 lines
660 B
TypeScript
25 lines
660 B
TypeScript
import { point, pointRotateRads } from "./point";
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import type { Radians } from "./types";
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describe("rotate", () => {
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it("should rotate over (x2, y2) and return the rotated coordinates for (x1, y1)", () => {
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const x1 = 10;
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const y1 = 20;
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const x2 = 20;
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const y2 = 30;
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const angle = (Math.PI / 2) as Radians;
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const [rotatedX, rotatedY] = pointRotateRads(
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point(x1, y1),
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point(x2, y2),
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angle,
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);
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expect([rotatedX, rotatedY]).toEqual([30, 20]);
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const res2 = pointRotateRads(
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point(rotatedX, rotatedY),
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point(x2, y2),
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-angle as Radians,
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);
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expect(res2).toEqual([x1, x2]);
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});
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});
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