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