Freeciv-3.1: /fast/freeciv/nightly/S3_1/server/generator/mapgen_utils.c File Reference

Freeciv-3.1

Loading...
Searching...
No Matches
Macros | Functions | Variables
mapgen_utils.c File Reference
`#include "fcintl.h"`
`#include "log.h"`
`#include "rand.h"`
`#include "support.h"`
`#include "map.h"`
`#include "packets.h"`
`#include "terrain.h"`
`#include "tile.h"`
`#include "mapgen_utils.h"`

Go to the source code of this file.

## Macros

#define | pmap(_tile) (placed_map[tile_index(_tile)])

## Functions

bool | placed_map_is_initialized (void)
void | create_placed_map (void)
void | destroy_placed_map (void)
bool | not_placed (const struct tile *ptile)
void | map_set_placed (struct tile *ptile)
void | map_unset_placed (struct tile *ptile)
void | set_all_ocean_tiles_placed (void)
void | set_placed_near_pos (struct tile *ptile, int dist)
void | adjust_int_map_filtered (int *int_map, int int_map_max, void *data, bool(*filter)(const struct tile *ptile, const void *data))
bool | is_normal_nat_pos (int x, int y)
void | smooth_int_map (int *int_map, bool zeroes_at_edges)
static void | recalculate_lake_surrounders (void)
static void | assign_continent_flood (struct tile *ptile, bool is_land, int nr)
void | regenerate_lakes (void)
int | get_lake_surrounders (Continent_id cont)
int | get_continent_size (Continent_id id)
int | get_ocean_size (Continent_id id)
void | assign_continent_numbers (void)
struct terrain * | most_shallow_ocean (bool frozen)
struct terrain * | pick_ocean (int depth, bool frozen)
static int | real_distance_to_land (const struct tile *ptile, int max)
static struct terrain * | most_adjacent_ocean_type (const struct tile *ptile)
void | smooth_water_depth (void)
void | generator_free (void)
struct terrain * | pick_terrain_by_flag (enum terrain_flag_id flag)
struct terrain * | pick_terrain (enum mapgen_terrain_property target, enum mapgen_terrain_property prefer, enum mapgen_terrain_property avoid)

## Variables

static bool * | placed_map
static Continent_id * | lake_surrounders = NULL
static int * | continent_sizes = NULL
static int * | ocean_sizes = NULL

## Macro Definition Documentation

## ◆ pmap

#define pmap | ( |  | _tile | ) | (placed_map[tile_index(_tile)])

Definition at line 66 of file mapgen_utils.c.

## Function Documentation

## ◆ adjust_int_map_filtered()

void adjust_int_map_filtered | ( | int * | int_map,
|  | int | int_map_max,
|  | void * | data,
|  | bool(*)(const struct tile *ptile, const void *data) | filter
| ) |  |

Change the values of the integer map, so that they contain ranking of each tile scaled to [0 .. int_map_max]. The lowest 20% of tiles will have values lower than 0.2 * int_map_max.

If filter is non-null then it only tiles for which filter(ptile, data) is TRUE will be considered.

Definition at line 122 of file mapgen_utils.c.

Referenced by create_start_positions().

## ◆ assign_continent_flood()

static void assign_continent_flood | ( | struct tile * | ptile,
|  | bool | is_land,
|  | int | nr
| ) |  |

static

Number this tile and nearby tiles with the specified continent number 'nr'. Due to the number of recursion for large maps a non-recursive algorithm is utilised.

is_land tells us whether we are assigning continent numbers or ocean numbers.

Definition at line 287 of file mapgen_utils.c.

Referenced by assign_continent_numbers().

## ◆ assign_continent_numbers()

void assign_continent_numbers | ( | void |  | ) |

Assigns continent and ocean numbers to all tiles, and set map.num_continents and map.num_oceans. Recalculates continent and ocean sizes, and lake_surrounders[] arrays.

Continents have numbers 1 to map.num_continents inclusive. Oceans have (negative) numbers -1 to -map.num_oceans inclusive.

Definition at line 449 of file mapgen_utils.c.

Referenced by api_edit_change_terrain(), check_edited_tile_terrains(), check_terrain_change(), make_polar_land(), map_fractal_generate(), sg_load_map_tiles(), and sg_load_map_tiles().

## ◆ create_placed_map()

void create_placed_map | ( | void |  | ) |

Create a clean pmap

Definition at line 48 of file mapgen_utils.c.

Referenced by initworld(), make_huts(), make_land(), and make_rivers().

## ◆ destroy_placed_map()

void destroy_placed_map | ( | void |  | ) |

Free the pmap

Definition at line 58 of file mapgen_utils.c.

Referenced by make_huts(), make_land(), make_rivers(), mapgenerator2(), mapgenerator3(), and mapgenerator4().

## ◆ generator_free()

void generator_free | ( | void |  | ) |

Free resources allocated by the generator.

Definition at line 659 of file mapgen_utils.c.

Referenced by server_quit().

## ◆ get_continent_size()

int get_continent_size | ( | Continent_id | id | ) |

Return size in tiles of the given continent (not ocean)

Definition at line 425 of file mapgen_utils.c.

Referenced by calculate_want_for_paratrooper(), initialize_isle_data(), and is_valid_start_pos().

## ◆ get_lake_surrounders()

int get_lake_surrounders | ( | Continent_id | cont | ) |

Get continent surrounding lake, or -1 if there is multiple continents.

Definition at line 417 of file mapgen_utils.c.

Referenced by is_claimable_ocean().

## ◆ get_ocean_size()

int get_ocean_size | ( | Continent_id | id | ) |

Return size in tiles of the given ocean. You should use positive ocean number.

Definition at line 435 of file mapgen_utils.c.

Referenced by is_claimable_ocean().

## ◆ is_normal_nat_pos()

bool is_normal_nat_pos | ( | int | x,
|  | int | y
| ) |  |

Is given native position normal position

Definition at line 176 of file mapgen_utils.c.

## ◆ map_set_placed()

void map_set_placed | ( | struct tile * | ptile | ) |

Mark tile terrain as placed.

Definition at line 79 of file mapgen_utils.c.

Referenced by fill_island(), initworld(), make_fracture_relief(), make_plain(), make_relief(), make_rivers(), place_terrain(), set_all_ocean_tiles_placed(), and set_placed_near_pos().

## ◆ map_unset_placed()

void map_unset_placed | ( | struct tile * | ptile | ) |

Mark tile terrain as not placed.

Definition at line 87 of file mapgen_utils.c.

Referenced by place_island().

## ◆ most_adjacent_ocean_type()

static struct terrain * most_adjacent_ocean_type | ( | const struct tile * | ptile | ) |

static

Determines what is the most popular ocean type around (need 2/3 of the adjacent tiles).

Definition at line 583 of file mapgen_utils.c.

Referenced by smooth_water_depth().

## ◆ most_shallow_ocean()

struct terrain * most_shallow_ocean | ( | bool | frozen | ) |

Return most shallow ocean terrain type. Prefers not to return freshwater terrain, and will ignore 'frozen' rather than do so.

Definition at line 497 of file mapgen_utils.c.

Referenced by check_terrain_change(), and remove_tiny_islands().

## ◆ not_placed()

bool not_placed | ( | const struct tile * | ptile | ) |

Checks if land has not yet been placed on pmap at (x, y)

Definition at line 71 of file mapgen_utils.c.

Referenced by condition_filter(), fill_island(), make_fracture_relief(), make_plains(), make_relief(), make_terrains(), and place_terrain().

## ◆ pick_ocean()

struct terrain * pick_ocean | ( | int | depth,
|  | bool | frozen
| ) |  |

Picks an ocean terrain to match the given depth. Only considers terrains with/without Frozen flag depending on 'frozen'. Return NULL when there is no available ocean.

Definition at line 543 of file mapgen_utils.c.

Referenced by fair_map_island_new(), initworld(), make_land(), make_polar(), map_generate_fair_islands(), and smooth_water_depth().

## ◆ pick_terrain()

struct terrain * pick_terrain | ( | enum mapgen_terrain_property | target,
|  | enum mapgen_terrain_property | prefer,
|  | enum mapgen_terrain_property | avoid
| ) |  |

Pick a terrain based on the target property and a property to avoid.

If the target property is given, then all terrains with that property will be considered and one will be picked at random based on the amount of the property each terrain has. If no target property is given all terrains will be assigned equal likelihood.

If the preferred property is given, only terrains with (some of) that property will be chosen.

If the avoid property is given, then any terrain with (any of) that property will be avoided.

This function must always return a valid terrain.

Definition at line 722 of file mapgen_utils.c.

Referenced by fair_map_island_new(), fill_island(), make_fracture_relief(), make_plain(), make_polar(), make_relief(), make_terrains(), and pick_terrain().

## ◆ pick_terrain_by_flag()

struct terrain * pick_terrain_by_flag | ( | enum terrain_flag_id | flag | ) |

Return a random terrain that has the specified flag. Returns T_UNKNOWN when there is no matching terrain.

Definition at line 679 of file mapgen_utils.c.

Referenced by fair_map_island_new(), and make_rivers().

## ◆ placed_map_is_initialized()

bool placed_map_is_initialized | ( | void |  | ) |

Return TRUE if initialized

Definition at line 40 of file mapgen_utils.c.

Referenced by create_placed_map(), destroy_placed_map(), and mapgenerator2().

## ◆ real_distance_to_land()

static int real_distance_to_land | ( | const struct tile * | ptile,
|  | int | max
| ) |  |

static

Determines the minimal distance to the land.

Definition at line 568 of file mapgen_utils.c.

Referenced by smooth_water_depth().

## ◆ recalculate_lake_surrounders()

static void recalculate_lake_surrounders | ( | void |  | ) |

static

Calculate lake_surrounders[] array

Definition at line 248 of file mapgen_utils.c.

Referenced by assign_continent_numbers().

## ◆ regenerate_lakes()

void regenerate_lakes | ( | void |  | ) |

Regenerate all oceanic tiles for small water bodies as lakes. Assumes assign_continent_numbers() and recalculate_lake_surrounders() have already been done! FIXME: insufficiently generalized, use terrain property.

Definition at line 347 of file mapgen_utils.c.

Referenced by map_fractal_generate().

## ◆ set_all_ocean_tiles_placed()

void set_all_ocean_tiles_placed | ( | void |  | ) |

Set all oceanics tiles in placed_map

Definition at line 95 of file mapgen_utils.c.

Referenced by make_land(), and make_rivers().

## ◆ set_placed_near_pos()

void set_placed_near_pos | ( | struct tile * | ptile,
|  | int | dist
| ) |  |

Set all nearby tiles as placed on pmap.

Definition at line 107 of file mapgen_utils.c.

Referenced by make_huts().

## ◆ smooth_int_map()

void smooth_int_map | ( | int * | int_map,
|  | bool | zeroes_at_edges
| ) |  |

Apply a Gaussian diffusion filter on the map. The size of the map is MAP_INDEX_SIZE and the map is indexed by native_pos_to_index function. If zeroes_at_edges is set, any unreal position on diffusion has 0 value if zeroes_at_edges in unset the unreal position are not counted.

Definition at line 188 of file mapgen_utils.c.

Referenced by create_start_positions(), and make_random_hmap().

## ◆ smooth_water_depth()

void smooth_water_depth | ( | void |  | ) |

Makes a simple depth map for all ocean tiles based on their proximity to any land tiles and reassignes ocean terrain types based on their MG_OCEAN_DEPTH property values.

Definition at line 609 of file mapgen_utils.c.

Referenced by map_fractal_generate().

## Variable Documentation

## ◆ continent_sizes

int* continent_sizes = NULL

static

Definition at line 242 of file mapgen_utils.c.

Referenced by assign_continent_flood(), assign_continent_numbers(), generator_free(), and get_continent_size().

## ◆ lake_surrounders

Continent_id* lake_surrounders = NULL

static

Definition at line 241 of file mapgen_utils.c.

Referenced by generator_free(), get_lake_surrounders(), recalculate_lake_surrounders(), and regenerate_lakes().

## ◆ ocean_sizes

int* ocean_sizes = NULL

static

Definition at line 243 of file mapgen_utils.c.

Referenced by assign_continent_flood(), assign_continent_numbers(), generator_free(), get_ocean_size(), and regenerate_lakes().

## ◆ placed_map

bool* placed_map

static

Definition at line 35 of file mapgen_utils.c.

Referenced by create_placed_map(), destroy_placed_map(), and placed_map_is_initialized().