Function SetTrainGroupID

src/group_cmd.cpp:765–783

* Affect the groupID of a train to new_g. * @note called in CmdAddVehicleGroup and CmdMoveRailVehicle * @param v First vehicle of the chain. * @param new_g index of array group */

 * @param new_g index of array group
 */
void SetTrainGroupID(Train *v, GroupID new_g)
{
	if (!Group::IsValidID(new_g) && !IsDefaultGroupID(new_g)) return;

	assert(v->IsFrontEngine() || IsDefaultGroupID(new_g));

	for (Vehicle *u = v; u != nullptr; u = u->Next()) {
		if (u->IsEngineCountable()) UpdateNumEngineGroup(u, u->group_id, new_g);

		u->group_id = new_g;
		u->colourmap = PAL_NONE;
		u->InvalidateNewGRFCache();
		u->UpdateViewport(true);
	}

	/* Update the Replace Vehicle Windows */
	GroupStatistics::UpdateAutoreplace(v->owner);
	SetWindowDirty(WC_REPLACE_VEHICLE, VEH_TRAIN);
}


/**