Function CmdTownGrowthRate

src/town_cmd.cpp:3194–3222

* Change the growth rate of the town. * @param flags Type of operation. * @param town_id Town ID to cargo game of. * @param growth_rate Amount of days between growth, or TOWN_GROWTH_RATE_NONE, or 0 to reset custom growth rate. * @return Empty cost or an error. */

 * @return Empty cost or an error.
 */
CommandCost CmdTownGrowthRate(DoCommandFlags flags, TownID town_id, uint16_t growth_rate)
{
	if (_current_company != OWNER_DEITY) return CMD_ERROR;

	Town *t = Town::GetIfValid(town_id);
	if (t == nullptr) return CMD_ERROR;

	if (flags.Test(DoCommandFlag::Execute)) {
		if (growth_rate == 0) {
			/* Just clear the flag, UpdateTownGrowth will determine a proper growth rate */
			t->flags.Reset(TownFlag::CustomGrowth);
		} else {
			uint old_rate = t->growth_rate;
			if (t->grow_counter >= old_rate) {
				/* This also catches old_rate == 0 */
				t->grow_counter = growth_rate;
			} else {
				/* Scale grow_counter, so half finished houses stay half finished */
				t->grow_counter = t->grow_counter * growth_rate / old_rate;
			}
			t->growth_rate = growth_rate;
			t->flags.Set(TownFlag::CustomGrowth);
		}
		UpdateTownGrowth(t);
		InvalidateWindowData(WC_TOWN_VIEW, town_id);
	}

	return CommandCost();
}

/**
 * Change the rating of a company in a town