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27 lines
636 B
TypeScript
27 lines
636 B
TypeScript
import * as GA from "./ga";
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import type { Line, Direction, Point } from "./ga";
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/**
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* A direction is stored as an array `[0, 0, 0, 0, y, x, 0, 0]` representing
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* vector `(x, y)`.
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*/
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export const from = (point: Point): Point => [
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0,
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0,
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0,
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0,
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point[4],
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point[5],
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0,
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0,
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];
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export const fromTo = (from: Point, to: Point): Direction =>
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GA.inormalized([0, 0, 0, 0, to[4] - from[4], to[5] - from[5], 0, 0]);
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export const orthogonal = (direction: Direction): Direction =>
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GA.inormalized([0, 0, 0, 0, -direction[5], direction[4], 0, 0]);
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export const orthogonalToLine = (line: Line): Direction => GA.mul(line, GA.I);
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