1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
|
/* $Id$ */
/*
* This file is part of OpenTTD.
* 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.
* 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.
* 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/>.
*/
/** @file script_subsidy.hpp Everything to query subsidies. */
#ifndef SCRIPT_SUBSIDY_HPP
#define SCRIPT_SUBSIDY_HPP
#include "script_company.hpp"
#include "script_date.hpp"
/**
* Class that handles all subsidy related functions.
* @api ai game
*/
class ScriptSubsidy : public ScriptObject {
public:
/**
* Enumeration for source and destination of a subsidy.
* @note The list of values may grow in future.
*/
enum SubsidyParticipantType {
/* Values are important, as they represent the internal state of the game.
* It is originally named SourceType. ST_HEADQUARTERS is intentionally
* left out, as it cannot be used for Subsidies. */
SPT_INDUSTRY = 0, ///< Subsidy participant is an industry
SPT_TOWN = 1, ///< Subsidy participant is a town
SPT_INVALID = 0xFF, ///< Invalid/unknown participant type
};
/**
* Check whether this is a valid SubsidyID.
* @param subsidy_id The SubsidyID to check.
* @return True if and only if this subsidy is still valid.
*/
static bool IsValidSubsidy(SubsidyID subsidy_id);
/**
* Checks whether this subsidy is already awarded to some company.
* @param subsidy_id The SubsidyID to check.
* @pre IsValidSubsidy(subsidy).
* @return True if and only if this subsidy is already awarded.
*/
static bool IsAwarded(SubsidyID subsidy_id);
/**
* Create a new subsidy.
* @param cargo_type The type of cargo to cary for the subsidy.
* @param from_type The type of the subsidy on the 'from' side.
* @param from_id The ID of the 'from' side.
* @param to_type The type of the subsidy on the 'to' side.
* @param to_id The ID of the 'to' side.
* @return True if the action succeeded.
* @pre ScriptCargo::IsValidCargo(cargo_type)
* @pre from_type == SPT_INDUSTRY || from_type == SPT_TOWN.
* @pre to_type == SPT_INDUSTRY || to_type == SPT_TOWN.
* @pre (from_type == SPT_INDUSTRY && ScriptIndustry::IsValidIndustry(from_id)) || (from_type == SPT_TOWN && ScriptTown::IsValidTown(from_id))
* @pre (to_type == SPT_INDUSTRY && ScriptIndustry::IsValidIndustry(to_id)) || (to_type == SPT_TOWN && ScriptTown::IsValidTown(to_id))
* @api -ai
*/
static bool Create(CargoID cargo_type, SubsidyParticipantType from_type, uint16 from_id, SubsidyParticipantType to_type, uint16 to_id);
/**
* Get the company index of the company this subsidy is awarded to.
* @param subsidy_id The SubsidyID to check.
* @pre IsAwarded(subsidy_id).
* @return The companyindex of the company this subsidy is awarded to.
*/
static ScriptCompany::CompanyID GetAwardedTo(SubsidyID subsidy_id);
/**
* Get the date this subsidy expires. In case the subsidy is already
* awarded, return the date the subsidy expires, else, return the date the
* offer expires.
* @param subsidy_id The SubsidyID to check.
* @pre IsValidSubsidy(subsidy_id).
* @return The last valid date of this subsidy.
* @note The return value of this function will change if the subsidy is
* awarded.
*/
static ScriptDate::Date GetExpireDate(SubsidyID subsidy_id);
/**
* Get the cargo type that has to be transported in order to be awarded this
* subsidy.
* @param subsidy_id The SubsidyID to check.
* @pre IsValidSubsidy(subsidy_id).
* @return The cargo type to transport.
*/
static CargoID GetCargoType(SubsidyID subsidy_id);
/**
* Returns the type of source of subsidy.
* @param subsidy_id The SubsidyID to check.
* @pre IsValidSubsidy(subsidy_id).
* @return Type of source of subsidy.
*/
static SubsidyParticipantType GetSourceType(SubsidyID subsidy_id);
/**
* Return the source IndustryID/TownID the subsidy is for.
* \li GetSourceType(subsidy_id) == SPT_INDUSTRY -> return the IndustryID.
* \li GetSourceType(subsidy_id) == SPT_TOWN -> return the TownID.
* @param subsidy_id The SubsidyID to check.
* @pre IsValidSubsidy(subsidy_id).
* @return One of TownID/IndustryID.
*/
static int32 GetSourceIndex(SubsidyID subsidy_id);
/**
* Returns the type of destination of subsidy.
* @param subsidy_id The SubsidyID to check.
* @pre IsValidSubsidy(subsidy_id).
* @return Type of destination of subsidy.
*/
static SubsidyParticipantType GetDestinationType(SubsidyID subsidy_id);
/**
* Return the destination IndustryID/TownID the subsidy is for.
* \li GetDestinationType(subsidy_id) == SPT_INDUSTRY -> return the IndustryID.
* \li GetDestinationType(subsidy_id) == SPT_TOWN -> return the TownID.
* @param subsidy_id the SubsidyID to check.
* @pre IsValidSubsidy(subsidy_id).
* @return One of TownID/IndustryID.
*/
static int32 GetDestinationIndex(SubsidyID subsidy_id);
};
#endif /* SCRIPT_SUBSIDY_HPP */
|
