line.ts

// SPDX-License-Identifier: Apache-2.0
import type { Attribs } from "./api.js";
import { liangBarsky2 } from "@thi.ng/geom-clip-line/liang-barsky";
import type { Vec, VecPair } from "@thi.ng/vectors";
import { Line } from "./api/line.js";
import { Rect } from "./api/rect.js";
import { __pclike } from "./internal/pclike.js";

export function line(a: Vec, b: Vec, attribs?: Attribs): Line;
export function line(pts: Iterable<Vec>, attribs?: Attribs): Line;
export function line(...args: any[]) {
	return __pclike(Line, args);
}

export const clippedLine = (l: Line, bounds: VecPair | Rect) => {
	const res =
		bounds instanceof Rect
			? liangBarsky2(l.points[0], l.points[1], bounds.pos, bounds.max())
			: liangBarsky2(l.points[0], l.points[1], bounds[0], bounds[1]);
	if (res) {
		return new Line([res[0], res[1]], { ...l.attribs });
	}
};