excalidraw/packages/math/arc.test.ts

import { isPointOnSymmetricArc } from "./arc";
import { pointFrom } from "./point";

describe("point on arc", () => {
  it("should detect point on simple arc", () => {
    expect(
      isPointOnSymmetricArc(
        {
          radius: 1,
          startAngle: -Math.PI / 4,
          endAngle: Math.PI / 4,
        },
        pointFrom(0.92291667, 0.385),
      ),
    ).toBe(true);
  });
  it("should not detect point outside of a simple arc", () => {
    expect(
      isPointOnSymmetricArc(
        {
          radius: 1,
          startAngle: -Math.PI / 4,
          endAngle: Math.PI / 4,
        },
        pointFrom(-0.92291667, 0.385),
      ),
    ).toBe(false);
  });
  it("should not detect point with good angle but incorrect radius", () => {
    expect(
      isPointOnSymmetricArc(
        {
          radius: 1,
          startAngle: -Math.PI / 4,
          endAngle: Math.PI / 4,
        },
        pointFrom(-0.5, 0.5),
      ),
    ).toBe(false);
  });
});