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https://github.com/excalidraw/excalidraw.git
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d6cd8b78f1
* feat: decouple package deps and introduce yarn workspaces * update root directory * fix * fix scripts * fix lint * update path in scripts * remove yarn.lock files from packages * ignore workspace * dummy * dummy * remove comment check * revert workflow changes * ignore ws when installing gh actions * remove log * update path * fix * fix typo
41 lines
1.1 KiB
TypeScript
41 lines
1.1 KiB
TypeScript
import * as GA from "./ga";
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import { Line, Direction, Point, Transform } from "./ga";
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import * as GADirection from "./gadirections";
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/**
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* TODO: docs
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*/
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export const rotation = (pivot: Point, angle: number): Transform =>
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GA.add(GA.mul(pivot, Math.sin(angle / 2)), Math.cos(angle / 2));
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export const translation = (direction: Direction): Transform => [
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1,
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0,
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0,
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0,
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-(0.5 * direction[5]),
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0.5 * direction[4],
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0,
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0,
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];
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export const translationOrthogonal = (
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direction: Direction,
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distance: number,
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): Transform => {
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const scale = 0.5 * distance;
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return [1, 0, 0, 0, scale * direction[4], scale * direction[5], 0, 0];
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};
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export const translationAlong = (line: Line, distance: number): Transform =>
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GA.add(GA.mul(GADirection.orthogonalToLine(line), 0.5 * distance), 1);
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export const compose = (motor1: Transform, motor2: Transform): Transform =>
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GA.mul(motor2, motor1);
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export const apply = (
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motor: Transform,
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nvector: Point | Direction | Line,
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): Point | Direction | Line =>
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GA.normalized(GA.mul(GA.mul(motor, nvector), GA.reverse(motor)));
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