Method previewPath

src/Battlescape/Pathfinding.cpp:839–921

* Marks tiles for the path preview. * @param bRemove Remove preview? * @return True, if a path is previewed. */

 * @return True, if a path is previewed.
 */
bool Pathfinding::previewPath(bool bRemove)
{
	if (_path.empty())
		return false;

	if (!bRemove && _pathPreviewed)
		return false;

	_pathPreviewed = !bRemove;

	Position pos = _unit->getPosition();
	Position destination;
	int tus = _unit->getTimeUnits();
	if (_unit->isKneeled())
	{
		tus -= 8;
	}
	int energy = _unit->getEnergy();
	int size = _unit->getArmor()->getSize() - 1;
	int total = _unit->isKneeled() ? 8 : 0;
	bool switchBack = false;
	if (_save->getBattleGame()->getReservedAction() == BA_NONE)
	{
		switchBack = true;
		_save->getBattleGame()->setTUReserved(BA_AUTOSHOT, false);
	}
	_modifierUsed = (SDL_GetModState() & KMOD_CTRL) != 0;
	bool running = Options::strafe && _modifierUsed && _unit->getArmor()->getSize() == 1 && _path.size() > 1;
	for (std::vector<int>::reverse_iterator i = _path.rbegin(); i != _path.rend(); ++i)
	{
		int dir = *i;
		int tu = getTUCost(pos, dir, &destination, _unit, 0, false); // gets tu cost, but also gets the destination position.
		if (running)
		{
			tu *= 0.75;
		}
		if (dir < Pathfinding::DIR_UP)
		{
			energy -= tu / 2;
		}

		tus -= tu;
		total += tu;
		bool reserve = _save->getBattleGame()->checkReservedTU(_unit, total, true);
		pos = destination;
		for (int x = size; x >= 0; x--)
		{
			for (int y = size; y >= 0; y--)
			{
				Tile *tile = _save->getTile(pos + Position(x,y,0));
				Tile *tileAbove = _save->getTile(pos + Position(x,y,1));
				if (!bRemove)
				{
					if (i == _path.rend() - 1)
					{
						tile->setPreview(10);
					}
					else