hvline.ts

import { asInt } from "@thi.ng/api/typedarray";

export function* hline(x: number, y: number, len: number) {
	[x, y, len] = asInt(x, y, len);
	for (const xmax = x + len; x < xmax; x++) {
		yield [x, y];
	}
}

export function* vline(x: number, y: number, len: number) {
	[x, y, len] = asInt(x, y, len);
	for (const ymax = y + len; y < ymax; y++) {
		yield [x, y];
	}
}

export function* hlineClipped(
	x: number,
	y: number,
	len: number,
	left: number,
	top: number,
	right: number,
	bottom: number
) {
	[x, y, len] = asInt(x, y, len);
	if (x >= right || y < top || y >= bottom) return;
	if (x < left) {
		len += x - left;
		x = left;
	}
	yield* hline(x, y, Math.min(len, right - x));
}

export function* vlineClipped(
	x: number,
	y: number,
	len: number,
	left: number,
	top: number,
	right: number,
	bottom: number
) {
	[x, y, len] = asInt(x, y, len);
	if (x < left || x >= right || y >= bottom) return;
	if (y < top) {
		len += y - top;
		y = top;
	}
	yield* vline(x, y, Math.min(len, bottom - y));
}