7 lines
363 B
TypeScript
7 lines
363 B
TypeScript
// Finished in earlier steps.
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export type Vec = { x: number; y: number };
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export const vec = (x: number, y: number): Vec => ({ x, y });
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export const sub = (a: Vec, b: Vec): Vec => ({ x: a.x - b.x, y: a.y - b.y });
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export const scale = (a: Vec, s: number): Vec => ({ x: a.x * s, y: a.y * s });
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export const dot = (a: Vec, b: Vec): number => a.x * b.x + a.y * b.y;
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