/** Rasterizes point primitives as fixed-size squares. */
export class PointRasterizer {
	/** Fills a circle at (cx, cy) with integer pixel radius, clamped to screen. */
	rasterize(
		cx: number,
		cy: number,
		radius: number,
		width: number,
		height: number,
		callback: (x: number, y: number) => void,
	): void {
		const r2 = radius * radius;
		const yMin = Math.max(0, Math.ceil(cy - radius));
		const yMax = Math.min(height - 1, Math.floor(cy + radius));

		for (let y = yMin; y <= yMax; y++) {
			const dy = y - cy;
			const halfW = Math.sqrt(r2 - dy * dy);
			const xMin = Math.max(0, Math.ceil(cx - halfW));
			const xMax = Math.min(width - 1, Math.floor(cx + halfW));
			for (let x = xMin; x <= xMax; x++) {
				callback(x, y);
			}
		}
	}
}