30 lines
961 B
TypeScript
30 lines
961 B
TypeScript
import { expect, test } from "vitest";
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import { sweepInterval } from "./sweep1d.ts";
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test("moving right into the interval", () => {
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// point at 0, moves +10 this frame, interval [5, 8]
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// enters at (5-0)/10 = 0.5, exits at (8-0)/10 = 0.8
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const s = sweepInterval(0, 10, 5, 8)!;
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expect(s.entry).toBeCloseTo(0.5);
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expect(s.exit).toBeCloseTo(0.8);
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});
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test("moving left: entry/exit are swapped into order", () => {
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// point at 10, moves -10, interval [5, 8]
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// crosses 8 at t=0.2, crosses 5 at t=0.5 -> entry 0.2, exit 0.5
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const s = sweepInterval(10, -10, 5, 8)!;
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expect(s.entry).toBeCloseTo(0.2);
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expect(s.exit).toBeCloseTo(0.5);
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expect(s.entry).toBeLessThanOrEqual(s.exit);
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});
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test("not moving but already inside -> infinite span", () => {
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const s = sweepInterval(6, 0, 5, 8)!;
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expect(s.entry).toBe(-Infinity);
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expect(s.exit).toBe(Infinity);
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});
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test("not moving and outside -> null", () => {
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expect(sweepInterval(2, 0, 5, 8)).toBeNull();
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});
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