Function GetIndustryGamePlayProbability

src/industry_cmd.cpp:2333–2351

* Compute the probability for constructing a new industry during game play. * @param it Industry type to compute. * @param[out] min_number Minimal number of industries that should exist at the map. * @return Relative probability for the industry to appear. */

 * @return Relative probability for the industry to appear.
 */
static uint16_t GetIndustryGamePlayProbability(IndustryType it, uint8_t *min_number)
{
	if (_settings_game.difficulty.industry_density == ID_FUND_ONLY) {
		*min_number = 0;
		return 0;
	}

	const IndustrySpec *ind_spc = GetIndustrySpec(it);
	uint8_t chance = ind_spc->appear_ingame[to_underlying(_settings_game.game_creation.landscape)];
	if (!ind_spc->enabled || ind_spc->layouts.empty() ||
			(ind_spc->behaviour.Test(IndustryBehaviour::Before1950) && TimerGameCalendar::year > 1950) ||
			(ind_spc->behaviour.Test(IndustryBehaviour::After1960) && TimerGameCalendar::year < 1960) ||
			(chance = GetIndustryProbabilityCallback(it, IACT_RANDOMCREATION, chance)) == 0) {
		*min_number = 0;
		return 0;
	}
	*min_number = ind_spc->behaviour.Test(IndustryBehaviour::CanCloseLastInstance) ? 1 : 0;
	return chance;
}

/**
 * Get wanted number of industries on the map.