Vad är felet med denna function?

Vector2D worldToMap(Vector2D pos) {
	int TILE_WIDTH = 60;
	int TILE_HEIGHT = 30;
	int TILE_WIDTH_HALF = TILE_WIDTH/2;
	int TILE_HEIGHT_HALF = TILE_HEIGHT/2;
	int map_x = (pos.x / TILE_WIDTH_HALF + pos.y / TILE_HEIGHT_HALF) / 2;
	int map_y = (pos.y / TILE_HEIGHT_HALF - (pos.x / TILE_WIDTH_HALF)) / 2;
	Vector2D result;
	result.x = map_x;
	result.y = map_y;
	return(result);
};
void lighting(std::vector<Sprite> toAffect,Sprite lightsource) {
	for (Sprite& a : toAffect) {
		Vector2D temp;
		temp.x = a.pos.x - (resolution.x/2);
		temp.y = a.pos.y - (resolution.x/2);
		SDL_SetTextureColorMod(a.texture,1000/getDistance(worldToMap(temp).x,worldToMap(temp).y,worldToMap(lightsource.pos).x,worldToMap(lightsour  ce.pos).y),1000/getDistance(worldToMap(temp).x,worldToMap(temp).y,worldToMap(lightsource.pos).x,worldToMap(lightsour  ce.pos).y),1000/getDistance(worldToMap(temp).x,worldToMap(temp).y,worldToMap(lightsource.pos).x,worldToMap(lightsour  ce.pos).y));
	};
};