24 lines
648 B
TypeScript
24 lines
648 B
TypeScript
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import * as GA from "./ga";
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import { 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 function from(point: Point): Point {
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return [0, 0, 0, 0, point[4], point[5], 0, 0];
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}
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export function fromTo(from: Point, to: Point): Direction {
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return GA.inormalized([0, 0, 0, 0, to[4] - from[4], to[5] - from[5], 0, 0]);
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}
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export function orthogonal(direction: Direction): Direction {
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return GA.inormalized([0, 0, 0, 0, -direction[5], direction[4], 0, 0]);
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}
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export function orthogonalToLine(line: Line): Direction {
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return GA.mul(line, GA.I);
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}
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