36 lines
1.3 KiB
TypeScript
36 lines
1.3 KiB
TypeScript
import { expect, test } from "bun:test";
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import { type AABB, vec } from "./given.ts";
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import { sweptAABB } from "./swept.ts";
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test("box moving right into a wall -> hits at the real gap", () => {
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// A right edge at x=2, B left edge at x=5 -> gap 3, speed 10 -> t=0.3
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const a: AABB = { x: 0, y: 0, w: 2, h: 2 };
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const b: AABB = { x: 5, y: 0, w: 2, h: 2 };
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const hit = sweptAABB(a, vec(10, 0), b)!;
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expect(hit.time).toBeCloseTo(0.3);
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expect(hit.normal).toEqual({ x: -1, y: 0 });
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});
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test("box passes below the wall -> null", () => {
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const a: AABB = { x: 0, y: 10, w: 2, h: 2 };
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const b: AABB = { x: 5, y: 0, w: 2, h: 2 };
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expect(sweptAABB(a, vec(10, 0), b)).toBeNull();
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});
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test("box moving left into a wall -> normal points right", () => {
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// A left edge at x=10, B right edge at x=2 -> gap 8, speed 10 -> t=0.8
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const a: AABB = { x: 10, y: 0, w: 2, h: 2 };
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const b: AABB = { x: 0, y: 0, w: 2, h: 2 };
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const hit = sweptAABB(a, vec(-10, 0), b)!;
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expect(hit.time).toBeCloseTo(0.8);
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expect(hit.normal).toEqual({ x: 1, y: 0 });
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});
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test("diagonal where y blocks first -> horizontal normal", () => {
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const a: AABB = { x: 0, y: 0, w: 2, h: 2 };
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const b: AABB = { x: 5, y: 8, w: 2, h: 2 };
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const hit = sweptAABB(a, vec(10, 10), b)!;
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expect(hit.time).toBeCloseTo(0.6);
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expect(hit.normal).toEqual({ x: 0, y: -1 });
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});
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