Method setDangerZone

src/Battlescape/TileEngine.cpp:2872–2914

* mark a region of the map as "dangerous" for a turn. * @param pos is the epicenter of the explosion. * @param radius how far to spread out. * @param unit the unit that is triggering this action. */

 * @param unit the unit that is triggering this action.
 */
void TileEngine::setDangerZone(Position pos, int radius, BattleUnit *unit)
{
	Tile *tile = _save->getTile(pos);
	if (!tile)
	{
		return;
	}
	// set the epicenter as dangerous
	tile->setDangerous();
	Position originVoxel = (pos * Position(16,16,24)) + Position(8,8,12 + -tile->getTerrainLevel());
	Position targetVoxel;
	for (int x = -radius; x != radius; ++x)
	{
		for (int y = -radius; y != radius; ++y)
		{
			// we can skip the epicenter
			if (x != 0 || y != 0)
			{
				// make sure we're within the radius
				if ((x*x)+(y*y) <= (radius*radius))
				{
					tile = _save->getTile(pos + Position(x,y,0));
					if (tile)
					{
						targetVoxel = ((pos + Position(x,y,0)) * Position(16,16,24)) + Position(8,8,12 + -tile->getTerrainLevel());
						std::vector<Position> trajectory;
						// we'll trace a line here, ignoring all units, to check if the explosion will reach this point
						// granted this won't properly account for explosions tearing through walls, but then we can't really
						// know that kind of information before the fact, so let's have the AI assume that the wall (or tree)
						// is enough to protect them.
						if (calculateLine(originVoxel, targetVoxel, false, &trajectory, unit, true, false, unit) == V_EMPTY)
						{
							if (trajectory.size() && (trajectory.back() / Position(16,16,24)) == pos + Position(x,y,0))
							{
								tile->setDangerous();
							}
						}
					}
				}
			}
		}
	}
}

}