Function GetTrainSpriteSize

src/train_cmd.cpp:582–607

* Get the size of the sprite of a train sprite heading west, or both heads (used for lists). * @param engine The engine to get the sprite from. * @param[out] width The width of the sprite. * @param[out] height The height of the sprite. * @param[out] xoffs Number of pixels to shift the sprite to the right. * @param[out] yoffs Number of pixels to shift the sprite downwards. * @param image_type

 * @param image_type Context the sprite is used in.
 */
void GetTrainSpriteSize(EngineID engine, uint &width, uint &height, int &xoffs, int &yoffs, EngineImageType image_type)
{
	int y = 0;

	VehicleSpriteSeq seq;
	GetRailIcon(engine, false, y, image_type, &seq);

	Rect rect;
	seq.GetBounds(&rect);

	width  = UnScaleGUI(rect.Width());
	height = UnScaleGUI(rect.Height());
	xoffs  = UnScaleGUI(rect.left);
	yoffs  = UnScaleGUI(rect.top);

	if (RailVehInfo(engine)->railveh_type == RAILVEH_MULTIHEAD) {
		GetRailIcon(engine, true, y, image_type, &seq);
		seq.GetBounds(&rect);

		/* Calculate values relative to an imaginary center between the two sprites. */
		width = ScaleSpriteTrad(TRAININFO_DEFAULT_VEHICLE_WIDTH) + UnScaleGUI(rect.right) - xoffs;
		height = std::max<uint>(height, UnScaleGUI(rect.Height()));
		xoffs  = xoffs - ScaleSpriteTrad(TRAININFO_DEFAULT_VEHICLE_WIDTH) / 2;
		yoffs  = std::min(yoffs, UnScaleGUI(rect.top));
	}
}

/**
 * Get a list of free wagons in a depot.