#include "rand.h"
#include "map.h"
#include "mapgen_topology.h"
#include "mapgen_utils.h"
#include "height_map.h"

Macros
#define	set_midpoints(X, Y, V)

Functions
static float	hmap_pole_factor (struct tile *ptile)

void	normalize_hmap_poles (void)

void	renormalize_hmap_poles (void)

void	make_random_hmap (int smooth)

static void	gen5rec (int step, int xl, int yt, int xr, int yb)

void	make_pseudofractal1_hmap (int extra_div)

bool	area_is_too_flat (struct tile *ptile, int thill, int my_height)

void	height_map_to_map (void)

Variables
int *	height_map = nullptr

int	hmap_shore_level = 0

int	hmap_mountain_level = 0

Macro Definition Documentation

◆ set_midpoints

#define set_midpoints	(	X,
		Y,
		V
	)

Value:

  {                                                                     \
    struct tile *ptile = native_pos_to_tile(&(wld.map), (X), (Y));      \
    if (map_colatitude(ptile) <= ICE_BASE_LEVEL / 2) {                  \
      /* Possibly flatten poles, or possibly not (even at map edge) */  \
      hmap(ptile) = (V) * (100 - wld.map.server.flatpoles) / 100;       \
    } else if (near_singularity(ptile)                                  \
               || hmap(ptile) != 0) {                                   \
      /* Do nothing */                                                  \
    } else {                                                            \
      hmap(ptile) = (V);                                                \
    }                                                                   \
  }

Function Documentation

◆ area_is_too_flat()

bool area_is_too_flat	(	struct tile *	ptile,
		int	thill,
		int	my_height
	)

We don't want huge areas of grassland/plains, so we put in a hill here and there, where it gets too 'clean'

Return TRUE if the terrain around the given map position is "clean". This means that all the terrain for 2 squares around it is not mountain or hill.

Definition at line 271 of file height_map.c.

Referenced by make_fracture_relief(), and make_relief().

◆ gen5rec()

static void gen5rec	(	int	step,
		int	xl,
		int	yt,
		int	xr,
		int	yb
	)

static

Recursive function which does the work for generator 5.

All (x0, y0) and (x1, y1) are in native coordinates.

Definition at line 120 of file height_map.c.

Referenced by gen5rec(), and make_pseudofractal1_hmap().

◆ height_map_to_map()

void height_map_to_map ( void )

Copy height map to actual map tiles.

Definition at line 300 of file height_map.c.

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

◆ hmap_pole_factor()

static float hmap_pole_factor ( struct tile * ptile )

static

Factor by which to lower height map near poles in normalize_hmap_poles()

Definition at line 35 of file height_map.c.

Referenced by normalize_hmap_poles(), and renormalize_hmap_poles().

◆ make_pseudofractal1_hmap()

void make_pseudofractal1_hmap ( int extra_div )

Generator 5 makes earthlike worlds with one or more large continents and a scattering of smaller islands. It does so by dividing the world into blocks and on each block raising or lowering the corners, then the midpoints and middle and so on recursively. Fiddling with 'xdiv' and 'ydiv' will change the size of the initial blocks and, if the map does not wrap in at least one direction, fiddling with 'avoidedge' will change the likelihood of continents butting up to non-wrapped edges.

All X and Y values used in this function are in native coordinates.

extra_div can be increased to break the world up into more, smaller islands. This is used in conjunction with the startpos setting.

Definition at line 198 of file height_map.c.

Referenced by map_fractal_generate().

◆ make_random_hmap()

void make_random_hmap ( int smooth )

Create uncorrelated rand map and do some call to smoth to correlate it a little and create random shapes

Definition at line 101 of file height_map.c.

Referenced by map_fractal_generate().

◆ normalize_hmap_poles()

void normalize_hmap_poles ( void )

Lower the land near the map edges and (optionally) the polar region to avoid too much land there.

◆ renormalize_hmap_poles()

void renormalize_hmap_poles ( void )

Invert (most of) the effects of normalize_hmap_poles() so that we have accurate heights for texturing the poles.

Definition at line 81 of file height_map.c.

Referenced by make_land().

Variable Documentation

◆ height_map

int* height_map = nullptr

Definition at line 29 of file height_map.c.

Referenced by create_island(), initworld(), make_fracture_map(), make_pseudofractal1_hmap(), make_random_hmap(), map_fractal_generate(), mapgenerator2(), mapgenerator3(), and mapgenerator4().

◆ hmap_mountain_level

int hmap_mountain_level = 0

Definition at line 30 of file height_map.c.

◆ hmap_shore_level

int hmap_shore_level = 0