#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "bitvector.h"
#include "fcintl.h"
#include "log.h"
#include "maphand.h"
#include "mem.h"
#include "nation.h"
#include "rand.h"
#include "shared.h"
#include "game.h"
#include "map.h"
#include "road.h"
#include "fracture_map.h"
#include "height_map.h"
#include "mapgen_topology.h"
#include "mapgen_utils.h"
#include "startpos.h"
#include "temperature_map.h"
#include "mapgen.h"
#include "speclist.h"

Data Structures
struct	gen234_state

struct	terrain_select

struct	river_map

struct	DataFilter

struct	test_func

struct	fair_tile

struct	fair_geometry_data

Macros
#define	SPECLIST_TAG terrain_select

#define	terrain_select_list_iterate(tersel_list, ptersel) TYPED_LIST_ITERATE(struct terrain_select, tersel_list, ptersel)

#define	terrain_select_list_iterate_end LIST_ITERATE_END

#define	RIVERS_MAXTRIES 32767

#define	HAS_POLES (MIN(COLD_LEVEL, 2 * ICE_BASE_LEVEL) > MIN_REAL_COLATITUDE(wld.map))

#define	map_pos_is_dry(ptile)

#define	ini_hmap_low_level()

#define	map_pos_is_low(ptile) ((hmap((ptile)) < hmap_low_level))

#define	PLACE_ONE_TYPE(count, alternate, ter, wc, tc, mc, weight)

#define	NUM_TEST_FUNCTIONS 9

#define	DMSIS 10

#define	fair_do_iso_hex_symmetry2 fair_do_rotation

Typedefs
typedef void(*	fair_geometry_func) (int x, int y)

Enumerations
enum	wetness_c { WC_ALL = 200 , WC_DRY , WC_NDRY }

enum	miscellaneous_c { MC_NONE , MC_LOW , MC_NLOW }

enum	fair_tile_flag { FTF_NONE = 0 , FTF_ASSIGNED = 1 << 0 , FTF_OCEAN = 1 << 1 , FTF_STARTPOS = 1 << 2 , FTF_NO_RESOURCE = 1 << 3 , FTF_HAS_HUT = 1 << 4 , FTF_NO_HUT = 1 << 5 }

Functions
static void	make_huts (int number)

static void	add_resources (int prob)

static void	mapgenerator2 (void)

static void	mapgenerator3 (void)

static void	mapgenerator4 (void)

static bool	map_generate_fair_islands (void)

static void	adjust_terrain_param (void)

static struct terrain_select *	tersel_new (int weight, enum mapgen_terrain_property target, enum mapgen_terrain_property prefer, enum mapgen_terrain_property avoid, int temp_condition, int wet_condition)

static void	tersel_free (struct terrain_select *ptersel)

static void	island_terrain_init (void)

static void	island_terrain_free (void)

static void	fill_island (int coast, long int bucket, const struct terrain_select_list tersel_list, const struct gen234_state *const pstate)

static bool	make_island (int islemass, int starters, struct gen234_state *pstate, int min_specific_island_size)

static int	river_test_blocked (struct river_map privermap, struct tile ptile, struct extra_type *priver)

static int	river_test_rivergrid (struct river_map privermap, struct tile ptile, struct extra_type *priver)

static int	river_test_highlands (struct river_map privermap, struct tile ptile, struct extra_type *priver)

static int	river_test_adjacent_ocean (struct river_map privermap, struct tile ptile, struct extra_type *priver)

static int	river_test_adjacent_river (struct river_map privermap, struct tile ptile, struct extra_type *priver)

static int	river_test_adjacent_highlands (struct river_map privermap, struct tile ptile, struct extra_type *priver)

static int	river_test_swamp (struct river_map privermap, struct tile ptile, struct extra_type *priver)

static int	river_test_adjacent_swamp (struct river_map privermap, struct tile ptile, struct extra_type *priver)

static int	river_test_height_map (struct river_map privermap, struct tile ptile, struct extra_type *priver)

static void	river_blockmark (struct river_map privermap, struct tile ptile)

static bool	make_river (struct river_map privermap, struct tile ptile, struct extra_type *priver)

static void	make_rivers (void)

static void	river_types_init (void)

static bool	test_wetness (const struct tile *ptile, wetness_c c)

static bool	test_miscellaneous (const struct tile *ptile, miscellaneous_c c)

static bool	condition_filter (const struct tile ptile, const void data)

static struct tile *	rand_map_pos_characteristic (wetness_c wc, temperature_type tc, miscellaneous_c mc)

static bool	terrain_is_too_high (struct tile *ptile, int thill, int my_height)

static void	make_relief (void)

static void	make_polar (void)

static bool	ok_for_separate_poles (struct tile *ptile)

static void	make_polar_land (void)

static void	place_terrain (struct tile ptile, int diff, struct terrain pterrain, int *to_be_placed, wetness_c wc, temperature_type tc, miscellaneous_c mc)

static void	make_plain (struct tile ptile, int to_be_placed)

static void	make_plains (void)

static void	make_terrains (void)

static void	make_land (void)

static bool	is_tiny_island (struct tile *ptile)

static void	remove_tiny_islands (void)

static void	print_mapgen_map (void)

bool	map_fractal_generate (bool autosize, struct unit_type *initial_unit)

static bool	near_safe_tiles (struct tile *ptile)

static bool	is_resource_close (const struct tile *ptile)

static struct tile *	get_random_map_position_from_state (const struct gen234_state *const pstate)

static bool	island_river_mouth_suitability (const struct tile ptile, const struct extra_type priver)

static bool	island_river_suitability (const struct tile ptile, const struct extra_type priver)

static void	fill_island_rivers (int coast, long int bucket, const struct gen234_state const pstate)

static bool	is_near_land (struct tile *ptile)

static bool	place_island (struct gen234_state *pstate)

static int	count_card_adjc_elevated_tiles (struct tile *ptile)

static bool	create_island (int islemass, struct gen234_state *pstate)

static void	initworld (struct gen234_state *pstate)

static struct fair_tile *	fair_map_new (void)

static void	fair_map_destroy (struct fair_tile *pmap)

static void	fair_map_tile_pos (struct fair_tile pmap, struct fair_tile ptile, int x, int y)

static struct fair_tile *	fair_map_pos_tile (struct fair_tile *pmap, int x, int y)

static struct fair_tile *	fair_map_tile_step (struct fair_tile pmap, struct fair_tile ptile, enum direction8 dir)

static bool	fair_map_tile_border (struct fair_tile pmap, struct fair_tile ptile, int dist)

static int	fair_team_placement_closest (const void a, const void b)

static int	fair_team_placement_horizontal (const void a, const void b)

static int	fair_team_placement_vertical (const void a, const void b)

static void	fair_do_symmetry1 (int x, int y)

static void	fair_do_symmetry2 (int x, int y)

static void	fair_do_hex_symmetry1 (int x, int y)

static void	fair_do_hex_symmetry2 (int x, int y)

static void	fair_do_iso_hex_symmetry1 (int x, int y)

static void	fair_do_rotation (int x, int y)

static void	fair_do_hex_rotation (int x, int y)

static void	fair_do_iso_hex_rotation (int x, int y)

static void	fair_do_geometry (const struct fair_geometry_data data, int x, int *y)

static void	fair_geometry_rand (struct fair_geometry_data *data)

static bool	fair_map_copy (struct fair_tile ptarget, int tx, int ty, struct fair_tile psource, const struct fair_geometry_data *data, int startpos_team_id)

static bool	fair_map_place_island_rand (struct fair_tile ptarget, struct fair_tile psource)

static bool	fair_map_place_island_team (struct fair_tile ptarget, int tx, int ty, struct fair_tile psource, const struct iter_index *outwards_indices, int startpos_team_id)

static void	fair_map_make_resources (struct fair_tile *pmap)

static void	fair_map_make_huts (struct fair_tile *pmap)

static struct fair_tile *	fair_map_island_new (int size, int startpos_num)

Variables
static struct extra_type *	river_types [MAX_EXTRA_TYPES]

static int	river_type_count = 0

struct {

bool init

struct terrain_select_list * forest

struct terrain_select_list * desert

struct terrain_select_list * mountain

struct terrain_select_list * swamp

}	island_terrain = { .init = FALSE }

static int	forest_pct = 0

static int	desert_pct = 0

static int	swamp_pct = 0

static int	mountain_pct = 0

static int	jungle_pct = 0

static int	river_pct = 0

static int	hmap_low_level = 0

static struct test_func	test_funcs [NUM_TEST_FUNCTIONS]

static long int	checkmass

Macro Definition Documentation

◆ DMSIS

#define DMSIS 10

Definition at line 2226 of file mapgen.c.

◆ fair_do_iso_hex_symmetry2

#define fair_do_iso_hex_symmetry2 fair_do_rotation

Definition at line 2708 of file mapgen.c.

◆ HAS_POLES

#define HAS_POLES (MIN(COLD_LEVEL, 2 * ICE_BASE_LEVEL) > MIN_REAL_COLATITUDE(wld.map))

Definition at line 157 of file mapgen.c.

◆ ini_hmap_low_level

#define ini_hmap_low_level ( )

Value:

{ \
hmap_low_level = (4 * swamp_pct  * \
     (hmap_max_level - hmap_shore_level)) / 100 + hmap_shore_level; \
}

Definition at line 186 of file mapgen.c.

◆ map_pos_is_dry

#define map_pos_is_dry ( ptile )

Value:

  (map_colatitude((ptile)) <= DRY_MAX_LEVEL                             \
   && map_colatitude((ptile)) > DRY_MIN_LEVEL                           \
   && count_terrain_class_near_tile(&(wld.map), (ptile),                \
                                    FALSE, TRUE, TC_OCEAN) <= 35)

Conditions used mainly in rand_map_pos_characteristic()

Definition at line 175 of file mapgen.c.

◆ map_pos_is_low

#define map_pos_is_low ( ptile ) ((hmap((ptile)) < hmap_low_level))

Definition at line 192 of file mapgen.c.

◆ NUM_TEST_FUNCTIONS

#define NUM_TEST_FUNCTIONS 9

Definition at line 683 of file mapgen.c.

◆ PLACE_ONE_TYPE

#define PLACE_ONE_TYPE	(	count,
		alternate,
		ter,
		wc,
		tc,
		mc,
		weight
	)

Value:

  if ((count) > 0) {                                      \
    struct tile *ptile;                                   \
    /* Place some terrains */                             \
    if ((ptile = rand_map_pos_characteristic((wc), (tc), (mc)))) {        \
      place_terrain(ptile, (weight), (ter), &(count), (wc),(tc), (mc));   \
    } else {                                                              \
      /* If rand_map_pos_temperature returns FALSE we may as well stop */ \
      /* looking for this time and go to alternate type. */               \
      (alternate) += (count); \
      (count) = 0;            \
    }                         \
  }

This place randomly a cluster of terrains with some characteristics

Definition at line 464 of file mapgen.c.

◆ RIVERS_MAXTRIES

#define RIVERS_MAXTRIES 32767

Definition at line 111 of file mapgen.c.

◆ SPECLIST_TAG

#define SPECLIST_TAG terrain_select

Definition at line 76 of file mapgen.c.

◆ terrain_select_list_iterate

#define terrain_select_list_iterate	(	tersel_list,
		ptersel
	)	TYPED_LIST_ITERATE(struct terrain_select, tersel_list, ptersel)

Definition at line 79 of file mapgen.c.

◆ terrain_select_list_iterate_end

#define terrain_select_list_iterate_end LIST_ITERATE_END

Definition at line 81 of file mapgen.c.

Typedef Documentation

◆ fair_geometry_func

typedef void(* fair_geometry_func) (int *x, int *y)

Definition at line 2525 of file mapgen.c.

Enumeration Type Documentation

◆ fair_tile_flag

enum fair_tile_flag

Enumerator
FTF_NONE
FTF_ASSIGNED
FTF_OCEAN
FTF_STARTPOS
FTF_NO_RESOURCE
FTF_HAS_HUT
FTF_NO_HUT

Definition at line 2507 of file mapgen.c.

◆ miscellaneous_c

enum miscellaneous_c

Enumerator
MC_NONE
MC_LOW
MC_NLOW

Definition at line 194 of file mapgen.c.

◆ wetness_c

enum wetness_c

Enumerator
WC_ALL
WC_DRY
WC_NDRY

Definition at line 180 of file mapgen.c.

Function Documentation

◆ add_resources()

static void add_resources ( int prob )

static

Add specials to the map with given probability (out of 1000).

Definition at line 1568 of file mapgen.c.

Referenced by map_fractal_generate().

◆ adjust_terrain_param()

static void adjust_terrain_param ( void )

static

Convert parameters from the server into terrains percents parameters for the generators

Definition at line 1484 of file mapgen.c.

Referenced by map_fractal_generate().

◆ condition_filter()

static bool condition_filter	(	const struct tile *	ptile,
		const void *	data
	)

static

A filter function to be passed to rand_map_pos_filtered(). See rand_map_pos_characteristic() for more explanation.

Definition at line 247 of file mapgen.c.

Referenced by rand_map_pos_characteristic().

◆ count_card_adjc_elevated_tiles()

static int count_card_adjc_elevated_tiles ( struct tile * ptile )

static

Returns the number of cardinally adjacent tiles have a non-zero elevation.

Definition at line 1914 of file mapgen.c.

Referenced by create_island().

◆ create_island()

static bool create_island	(	int	islemass,
		struct gen234_state *	pstate
	)

static

finds a place and drop the island created when called with islemass != 0

Definition at line 1930 of file mapgen.c.

Referenced by make_island().

◆ fair_do_geometry()

static void fair_do_geometry	(	const struct fair_geometry_data *	data,
		int *	x,
		int *	y
	)

static

Perform transformations defined into 'data' to position ('x', 'y').

Definition at line 2746 of file mapgen.c.

Referenced by fair_map_copy().

◆ fair_do_hex_rotation()

static void fair_do_hex_rotation	(	int *	x,
		int *	y
	)

static

Rotation matrix for hexgonal topology.

Definition at line 2724 of file mapgen.c.

Referenced by fair_geometry_rand().

◆ fair_do_hex_symmetry1()

static void fair_do_hex_symmetry1	(	int *	x,
		int *	y
	)

static

Symmetry matrix for hexagonal topologies.

Definition at line 2686 of file mapgen.c.

Referenced by fair_geometry_rand().

◆ fair_do_hex_symmetry2()

static void fair_do_hex_symmetry2	(	int *	x,
		int *	y
	)

static

Symmetry matrix for hexagonal topologies.

Definition at line 2694 of file mapgen.c.

Referenced by fair_geometry_rand().

◆ fair_do_iso_hex_rotation()

static void fair_do_iso_hex_rotation	(	int *	x,
		int *	y
	)

static

Rotation matrix for hexgonal-isometric topology.

Definition at line 2735 of file mapgen.c.

Referenced by fair_geometry_rand().

◆ fair_do_iso_hex_symmetry1()

static void fair_do_iso_hex_symmetry1	(	int *	x,
		int *	y
	)

static

Symmetry matrix for hexgonal-isometric topology.

Definition at line 2703 of file mapgen.c.

Referenced by fair_geometry_rand().

◆ fair_do_rotation()

static void fair_do_rotation	(	int *	x,
		int *	y
	)

static

Rotation matrix, also symmetry matrix for hexagonal-isometric topology.

Definition at line 2713 of file mapgen.c.

Referenced by fair_geometry_rand().

◆ fair_do_symmetry1()

static void fair_do_symmetry1	(	int *	x,
		int *	y
	)

static

Symmetry matrix.

Definition at line 2670 of file mapgen.c.

Referenced by fair_geometry_rand().

◆ fair_do_symmetry2()

static void fair_do_symmetry2	(	int *	x,
		int *	y
	)

static

Symmetry matrix.

Definition at line 2678 of file mapgen.c.

Referenced by fair_geometry_rand().

◆ fair_geometry_rand()

static void fair_geometry_rand ( struct fair_geometry_data * data )

static

Push random transformations to 'data'.

Definition at line 2759 of file mapgen.c.

Referenced by fair_map_place_island_rand(), and fair_map_place_island_team().

◆ fair_map_copy()

static bool fair_map_copy	(	struct fair_tile *	ptarget,
		int	tx,
		int	ty,
		struct fair_tile *	psource,
		const struct fair_geometry_data *	data,
		int	startpos_team_id
	)

static

Copy 'psource' on 'ptarget' at position ('tx', 'ty'), performing transformations defined into 'data'. Assign start positions for team 'startpos_team_id'. Return TRUE if we have copied the map, FALSE if the copy was not possible.

Definition at line 2810 of file mapgen.c.

Referenced by fair_map_place_island_rand(), and fair_map_place_island_team().

◆ fair_map_destroy()

static void fair_map_destroy ( struct fair_tile * pmap )

inlinestatic

Free a map.

Definition at line 2543 of file mapgen.c.

Referenced by map_generate_fair_islands().

◆ fair_map_island_new()

static struct fair_tile * fair_map_island_new	(	int	size,
		int	startpos_num
	)

static

Generate a map where an island would be placed in the center.

Definition at line 3055 of file mapgen.c.

Referenced by map_generate_fair_islands().

◆ fair_map_make_huts()

static void fair_map_make_huts ( struct fair_tile * pmap )

static

Add huts on 'pmap'.

Definition at line 3003 of file mapgen.c.

Referenced by fair_map_island_new(), and map_generate_fair_islands().

◆ fair_map_make_resources()

static void fair_map_make_resources ( struct fair_tile * pmap )

static

Add resources on 'pmap'.

Definition at line 2953 of file mapgen.c.

Referenced by fair_map_island_new(), and map_generate_fair_islands().

◆ fair_map_new()

static struct fair_tile * fair_map_new ( void )

inlinestatic

Create a map. Note that all maps have the same dimensions, to be able to call map utilities.

Definition at line 2535 of file mapgen.c.

Referenced by fair_map_island_new(), and map_generate_fair_islands().

◆ fair_map_place_island_rand()

static bool fair_map_place_island_rand	(	struct fair_tile *	ptarget,
		struct fair_tile *	psource
	)

static

Attempts to copy 'psource' to 'ptarget' at a random position, with random geometric effects.

Definition at line 2888 of file mapgen.c.

Referenced by map_generate_fair_islands().

◆ fair_map_place_island_team()

static bool fair_map_place_island_team	(	struct fair_tile *	ptarget,
		int	tx,
		int	ty,
		struct fair_tile *	psource,
		const struct iter_index *	outwards_indices,
		int	startpos_team_id
	)

static

Attempts to copy 'psource' to 'ptarget' as close as possible of position 'x', 'y' for players of the team 'team_id'.

Definition at line 2923 of file mapgen.c.

Referenced by map_generate_fair_islands().

◆ fair_map_pos_tile()

static struct fair_tile * fair_map_pos_tile	(	struct fair_tile *	pmap,
		int	x,
		int	y
	)

inlinestatic

Get the tile at the position ('x', 'y').

Definition at line 2561 of file mapgen.c.

Referenced by fair_map_copy(), fair_map_island_new(), and fair_map_tile_step().

◆ fair_map_tile_border()

static bool fair_map_tile_border	(	struct fair_tile *	pmap,
		struct fair_tile *	ptile,
		int	dist
	)

inlinestatic

Returns whether 'ptile' is at least at 'dist' tiles (in real distance) to the border. Note is also take in account map wrapping.

Definition at line 2605 of file mapgen.c.

Referenced by fair_map_island_new().

◆ fair_map_tile_pos()

static void fair_map_tile_pos	(	struct fair_tile *	pmap,
		struct fair_tile *	ptile,
		int *	x,
		int *	y
	)

inlinestatic

Get the coordinates of tile 'ptile'.

Definition at line 2551 of file mapgen.c.

Referenced by fair_map_copy(), and fair_map_tile_step().

◆ fair_map_tile_step()

static struct fair_tile * fair_map_tile_step	(	struct fair_tile *	pmap,
		struct fair_tile *	ptile,
		enum direction8	dir
	)

inlinestatic

Get the next tile in direction 'dir'.

Definition at line 2590 of file mapgen.c.

Referenced by fair_map_island_new(), and fair_map_make_resources().

◆ fair_team_placement_closest()

static int fair_team_placement_closest	(	const void *	a,
		const void *	b
	)

static

Compare two iter_index values for doing closest team placement.

Definition at line 2632 of file mapgen.c.

Referenced by map_generate_fair_islands().

◆ fair_team_placement_horizontal()

static int fair_team_placement_horizontal	(	const void *	a,
		const void *	b
	)

static

Compare two iter_index values for doing horizontal team placement.

Definition at line 2642 of file mapgen.c.

Referenced by map_generate_fair_islands().

◆ fair_team_placement_vertical()

static int fair_team_placement_vertical	(	const void *	a,
		const void *	b
	)

static

Compare two iter_index values for doing vertical team placement.

Definition at line 2656 of file mapgen.c.

Referenced by map_generate_fair_islands().

◆ fill_island()

static void fill_island	(	int	coast,
		long int *	bucket,
		const struct terrain_select_list *	tersel_list,
		const struct gen234_state *const	pstate
	)

static

Fill an island with different types of terrains; rivers have extra code.

Definition at line 1643 of file mapgen.c.

Referenced by make_island().

◆ fill_island_rivers()

static void fill_island_rivers	(	int	coast,
		long int *	bucket,
		const struct gen234_state *const	pstate
	)

static

Fill an island with rivers.

Definition at line 1767 of file mapgen.c.

Referenced by make_island().

◆ get_random_map_position_from_state()

static struct tile * get_random_map_position_from_state ( const struct gen234_state *const pstate )

static

Returns a random position in the rectangle denoted by the given state.

Definition at line 1592 of file mapgen.c.

Referenced by create_island(), fill_island(), and fill_island_rivers().

◆ initworld()

static void initworld ( struct gen234_state * pstate )

static

fill ocean and make polar A temperature map is created in map_fractal_generate().

Definition at line 2194 of file mapgen.c.

Referenced by mapgenerator2(), mapgenerator3(), and mapgenerator4().

◆ is_near_land()

static bool is_near_land ( struct tile * ptile )

static

Return TRUE if the ocean position is near land. This is used in the creation of islands, so it differs logically from near_safe_tiles().

Definition at line 1823 of file mapgen.c.

Referenced by place_island().

◆ is_resource_close()

static bool is_resource_close ( const struct tile * ptile )

static

Return TRUE iff there's a resource within one tile of the given map position.

Definition at line 1554 of file mapgen.c.

Referenced by add_resources().

◆ is_tiny_island()

static bool is_tiny_island ( struct tile * ptile )

static

Returns if this is a 1x1 island

Definition at line 1150 of file mapgen.c.

Referenced by remove_tiny_islands().

◆ island_river_mouth_suitability()

static bool island_river_mouth_suitability	(	const struct tile *	ptile,
		const struct extra_type *	priver
	)

static

Returns TRUE if ptile is suitable for a river mouth.

Definition at line 1722 of file mapgen.c.

Referenced by fill_island_rivers().

◆ island_river_suitability()

static bool island_river_suitability	(	const struct tile *	ptile,
		const struct extra_type *	priver
	)

static

Returns TRUE if there is a river in a cardinal direction near the tile and the tile is suitable for extending it.

Definition at line 1743 of file mapgen.c.

Referenced by fill_island_rivers().

◆ island_terrain_free()

static void island_terrain_free ( void )

static

Free memory allocated for terrain selection lists.

Definition at line 2061 of file mapgen.c.

Referenced by map_fractal_generate().

◆ island_terrain_init()

static void island_terrain_init ( void )

static

Initialize terrain selection lists for make_island().

Definition at line 2000 of file mapgen.c.

Referenced by map_fractal_generate().

◆ make_huts()

static void make_huts ( int number )

static

This function spreads out huts on the map, a position can be used for a hut if there isn't another hut close and if it's not on the ocean.

Definition at line 1527 of file mapgen.c.

Referenced by map_fractal_generate().

◆ make_island()

static bool make_island	(	int	islemass,
		int	starters,
		struct gen234_state *	pstate,
		int	min_specific_island_size
	)

static

make an island, fill every tile type except plains note: you have to create big islands first. Return TRUE if successful. min_specific_island_size is a percent value.

Definition at line 2081 of file mapgen.c.

Referenced by initworld(), mapgenerator2(), mapgenerator3(), and mapgenerator4().

◆ make_land()

static void make_land ( void )

static

make land simply does it all based on a generated heightmap 1) with map.server.landpercent it generates a ocean/unknown map 2) it then calls the above functions to generate the different terrains

Definition at line 1047 of file mapgen.c.

Referenced by map_fractal_generate().

◆ make_plain()

static void make_plain	(	struct tile *	ptile,
		int *	to_be_placed
	)

static

A simple function that adds plains grassland or tundra to the current location.

Definition at line 428 of file mapgen.c.

Referenced by make_plains(), and make_terrains().

◆ make_plains()

static void make_plains ( void )

static

Make_plains converts all not yet placed terrains to plains (tundra, grass) used by generators 2-4

Definition at line 449 of file mapgen.c.

Referenced by mapgenerator2(), mapgenerator3(), and mapgenerator4().

◆ make_polar()

static void make_polar ( void )

static

Add frozen tiles in the arctic zone. If ruleset has frozen ocean, use that, else use frozen land terrains with appropriate texturing. This is used in generators 2-4.

Definition at line 331 of file mapgen.c.

Referenced by initworld(), and map_generate_fair_islands().

◆ make_polar_land()

static void make_polar_land ( void )

static

Place untextured land at the poles on any tile that is not already covered with TER_FROZEN terrain. This is used by generators 1 and 5.

Definition at line 371 of file mapgen.c.

Referenced by make_land().

◆ make_relief()

static void make_relief ( void )

static

make_relief() will convert all squares that are higher than thill to mountains and hills. Note that thill will be adjusted according to the map.server.steepness value, so increasing map.mountains will result in more hills and mountains.

Definition at line 294 of file mapgen.c.

Referenced by make_land().

◆ make_river()

static bool make_river	(	struct river_map *	privermap,
		struct tile *	ptile,
		struct extra_type *	priver
	)

static

Makes a river starting at (x, y). Returns 1 if it succeeds. Return 0 if it fails. The river is stored in river_map.

How to make a river path look natural

Rivers always flow down. Thus rivers are best implemented on maps where every tile has an explicit height value. However, Freeciv has a flat map. But there are certain things that help the user imagine differences in height between tiles. The selection of direction for rivers should confirm and even amplify the user's image of the map's topology.

To decide which direction the river takes, the possible directions are tested in a series of test until there is only 1 direction left. Some tests are fatal. This means that they can sort away all remaining directions. If they do so, the river is aborted. Here follows a description of the test series.

Falling into itself: fatal (river_test_blocked) This is tested by looking up in the river_map array if a tile or every tile surrounding the tile is marked as blocked. A tile is marked as blocked if it belongs to the current river or has been evaluated in a previous iteration in the creation of the current river.

Possible values: 0: Is not falling into itself. 1: Is falling into itself.

Forming a 4-river-grid: optionally fatal (river_test_rivergrid) A minimal 4-river-grid is formed when an intersection in the map grid is surrounded by 4 river tiles. There can be larger river grids consisting of several overlapping minimal 4-river-grids.

Possible values: 0: Is not forming a 4-river-grid. 1: Is forming a 4-river-grid.

Highlands: (river_test_highlands) Rivers must not flow up in mountains or hills if there are alternatives.

Possible values: 0: Is not hills and not mountains. 1: Is hills. 2: Is mountains.

Adjacent ocean: (river_test_adjacent_ocean) Rivers must flow down to coastal areas when possible:

Possible values: 0-100

Adjacent river: (river_test_adjacent_river) Rivers must flow down to areas near other rivers when possible:

Possible values: 0-100

Adjacent highlands: (river_test_adjacent_highlands) Rivers must not flow towards highlands if there are alternatives.

Swamps: (river_test_swamp) Rivers must flow down in swamps when possible.

Possible values: 0: Is swamps. 1: Is not swamps.

Adjacent swamps: (river_test_adjacent_swamp) Rivers must flow towards swamps when possible.

height_map: (river_test_height_map) Rivers must flow in the direction which takes it to the tile with the lowest value on the height_map.

Possible values: n: height_map[...]

If these rules haven't decided the direction, the random number generator gets the desicion. -Erik Sigra

Definition at line 786 of file mapgen.c.

Referenced by make_rivers().

◆ make_rivers()

static void make_rivers ( void )

static

Calls make_river until there are enough river tiles on the map. It stops when it has tried to create RIVERS_MAXTRIES rivers. -Erik Sigra

Definition at line 900 of file mapgen.c.

Referenced by make_land().

◆ make_terrains()

static void make_terrains ( void )

static

Make_terrains calls make_forest, make_dessert,etc with random free locations until there has been made enough. Comment: funtions as make_swamp, etc. has to have a non 0 probability to place one terrains in called position. Else make_terrains will get in a infinite loop!

Definition at line 485 of file mapgen.c.

Referenced by make_land().

◆ map_fractal_generate()

bool map_fractal_generate	(	bool	autosize,
		struct unit_type *	initial_unit
	)

See stdinhand.c for information on map generation methods.

FIXME: Some continent numbers are unused at the end of this function, fx removed completely by remove_tiny_islands. When this function is finished various data is written to "islands", indexed by continent numbers, so a simple renumbering would not work...

If "autosize" is specified then mapgen will automatically size the map based on the map.server.size server parameter and the specified topology. If not map.xsize and map.ysize will be used.

Definition at line 1261 of file mapgen.c.

Referenced by srv_ready().

◆ map_generate_fair_islands()

static bool map_generate_fair_islands ( void )

static

Build a map using generator 'FAIR'.

Definition at line 3366 of file mapgen.c.

Referenced by map_fractal_generate().

◆ mapgenerator2()

static void mapgenerator2 ( void )

static

Island base map generators

Definition at line 2231 of file mapgen.c.

Referenced by map_fractal_generate().

◆ mapgenerator3()

static void mapgenerator3 ( void )

static

On popular demand, this tries to mimick the generator 3 as best as possible.

PS: I'd like to mult by 3/2, but starters might make trouble then

Definition at line 2326 of file mapgen.c.

Referenced by map_fractal_generate().

◆ mapgenerator4()

static void mapgenerator4 ( void )

static

Generator for placing a couple of players to each island.

PS: The weights NEED to sum up to totalweight (dammit)

Definition at line 2423 of file mapgen.c.

Referenced by map_fractal_generate().

◆ near_safe_tiles()

static bool near_safe_tiles ( struct tile * ptile )

static

Return TRUE if a safe tile is in a radius of 1. This function is used to test where to place specials on the sea.

Definition at line 1512 of file mapgen.c.

Referenced by add_resources().

◆ ok_for_separate_poles()

static bool ok_for_separate_poles ( struct tile * ptile )

static

If separatepoles is set, return false if this tile has to keep ocean

Definition at line 353 of file mapgen.c.

Referenced by make_polar_land().

◆ place_island()

static bool place_island ( struct gen234_state * pstate )

static

Finds a place and drop the island created when called with islemass != 0

Definition at line 1840 of file mapgen.c.

Referenced by create_island().

◆ place_terrain()

static void place_terrain	(	struct tile *	ptile,
		int	diff,
		struct terrain *	pterrain,
		int *	to_be_placed,
		wetness_c	wc,
		temperature_type	tc,
		miscellaneous_c	mc
	)

static

Recursively generate terrains.

Definition at line 393 of file mapgen.c.

Referenced by place_terrain().

◆ print_mapgen_map()

static void print_mapgen_map ( void )

static

Debugging function to print information about the map that's been generated.

Definition at line 1200 of file mapgen.c.

Referenced by map_fractal_generate().

◆ rand_map_pos_characteristic()

static struct tile * rand_map_pos_characteristic	(	wetness_c	wc,
		temperature_type	tc,
		miscellaneous_c	mc
	)

static

Return random map coordinates which have some conditions and which are not yet placed on pmap. Returns NULL if there is no such position.

Definition at line 262 of file mapgen.c.

Referenced by make_huts(), make_rivers(), and make_terrains().

◆ remove_tiny_islands()

static void remove_tiny_islands ( void )

static

Removes all 1x1 islands (sets them to ocean). This happens before regenerate_lakes(), so don't need to worry about TER_FRESHWATER here.

Definition at line 1176 of file mapgen.c.

Referenced by map_fractal_generate().

◆ river_blockmark()

static void river_blockmark	(	struct river_map *	privermap,
		struct tile *	ptile
	)

static

Called from make_river. Marks all directions as blocked. -Erik Sigra

Definition at line 666 of file mapgen.c.

Referenced by make_river().