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A Source is either a CompanyID (Headquarters), IndustryID or TownID. When making those types stronger a lot of casts would be needed, but with these simple helpers the intent is shown more clearly.
69 lines
3.1 KiB
C
69 lines
3.1 KiB
C
/*
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* This file is part of OpenTTD.
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* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
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* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file subsidy_base.h %Subsidy base class. */
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#ifndef SUBSIDY_BASE_H
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#define SUBSIDY_BASE_H
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#include "cargo_type.h"
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#include "company_type.h"
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#include "source_type.h"
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#include "subsidy_type.h"
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#include "core/pool_type.hpp"
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using SubsidyPool = Pool<Subsidy, SubsidyID, 1, SubsidyID::End().base()>;
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extern SubsidyPool _subsidy_pool;
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/** Struct about subsidies, offered and awarded */
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struct Subsidy : SubsidyPool::PoolItem<&_subsidy_pool> {
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CargoType cargo_type; ///< Cargo type involved in this subsidy, INVALID_CARGO for invalid subsidy
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uint16_t remaining; ///< Remaining months when this subsidy is valid
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CompanyID awarded; ///< Subsidy is awarded to this company; INVALID_COMPANY if it's not awarded to anyone
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Source src; ///< Source of subsidised path
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Source dst; ///< Destination of subsidised path
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/**
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* We need an (empty) constructor so struct isn't zeroed (as C++ standard states)
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*/
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inline Subsidy() { }
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/**
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* (Empty) destructor has to be defined else operator delete might be called with nullptr parameter
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*/
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inline ~Subsidy() { }
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/**
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* Tests whether this subsidy has been awarded to someone
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* @return is this subsidy awarded?
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*/
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inline bool IsAwarded() const
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{
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return this->awarded != INVALID_COMPANY;
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}
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void AwardTo(CompanyID company);
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};
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/** Constants related to subsidies */
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static const uint SUBSIDY_OFFER_MONTHS = 12; ///< Duration of subsidy offer
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static const uint SUBSIDY_PAX_MIN_POPULATION = 400; ///< Min. population of towns for subsidised pax route
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static const uint SUBSIDY_CARGO_MIN_POPULATION = 900; ///< Min. population of destination town for cargo route
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static const uint SUBSIDY_MAX_PCT_TRANSPORTED = 42; ///< Subsidy will be created only for towns/industries with less % transported
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static const uint SUBSIDY_MAX_DISTANCE = 70; ///< Max. length of subsidised route (DistanceManhattan)
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static const uint SUBSIDY_TOWN_CARGO_RADIUS = 6; ///< Extent of a tile area around town center when scanning for town cargo acceptance and production (6 ~= min catchmement + min station / 2)
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/** Types of subsidy news messages, which determine how the date is printed and whether to use singular or plural cargo names */
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enum class SubsidyDecodeParamType : uint8_t {
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NewsOffered = 0, ///< News item for an offered subsidy
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NewsAwarded = 1, ///< News item for an awarded subsidy
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NewsWithdrawn = 2, ///< News item for a subsidy offer withdrawn, or expired subsidy
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Gui = 3, ///< Subsidies listed in the Subsidy GUI
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};
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#endif /* SUBSIDY_BASE_H */
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