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More intersection detection functions

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Mark Tolmacs 2024-09-30 15:31:02 +02:00
parent b7f504796b
commit 6e67aa3a3c
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4 changed files with 75 additions and 12 deletions
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33
packages/math/ellipse.test.ts
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@ -3,7 +3,9 @@ import {
ellipseSegmentInterceptPoints,
ellipseIncludesPoint,
ellipseTouchesPoint,
ellipseIntersectsLine,
} from "./ellipse";
import { line } from "./line";
import { point } from "./point";
import { segment } from "./segment";
import type { Ellipse, GlobalPoint } from "./types";
@ -47,7 +49,7 @@ describe("point and ellipse", () => {
});
});
describe("line and ellipse", () => {
describe("segment and ellipse", () => {
it("detects outside segment", () => {
const e = ellipse(point(0, 0), 2, 2);
@ -77,3 +79,32 @@ describe("line and ellipse", () => {
).toEqual([]);
});
});
describe("line and ellipse", () => {
const e = ellipse(point(0, 0), 2, 2);
it("detects outside line", () => {
expect(
ellipseIntersectsLine(
e,
line<GlobalPoint>(point(-10, -10), point(10, -10)),
),
).toEqual([]);
});
it("detects line intersecting ellipse", () => {
expect(
ellipseIntersectsLine(e, line<GlobalPoint>(point(0, -1), point(0, 1))),
).toEqual([point(0, 2), point(0, -2)]);
expect(
ellipseIntersectsLine(
e,
line<GlobalPoint>(point(-100, 0), point(-10, 0)),
).map(([x, y]) => point(Math.round(x), Math.round(y))),
).toEqual([point(2, 0), point(-2, 0)]);
});
it("detects line touching ellipse", () => {
expect(
ellipseIntersectsLine(e, line<GlobalPoint>(point(-2, -2), point(2, -2))),
).toEqual([point(0, -2)]);
});
});