maze_gen.c File Reference

#include <stdlib.h>
#include <stdio.h>
#include <global.h>
#include <maze_gen.h>
#include <time.h>

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Data Structures
struct	free_walls_struct

Typedefs
typedef struct free_walls_struct	free_walls_struct

Functions
static void	fill_maze_full (char **maze, int x, int y, int xsize, int ysize, free_walls_struct *)
static void	fill_maze_sparse (char **maze, int x, int y, int xsize, int ysize, free_walls_struct *)
static int	find_free_point (char **maze, int *x, int *y, int xc, int yc, int xsize, int ysize)
static void	make_wall_free_list (int xsize, int ysize, free_walls_struct *)
char **	maze_gen (int xsize, int ysize, int option)
static void	pop_wall_point (int *x, int *y, free_walls_struct *)

Detailed Description

General maze generator.

Author

peter.nosp@m.m@la.nosp@m.ngmui.nosp@m.r.ee.nosp@m.cs.be.nosp@m.rkel.nosp@m.ey.ed.nosp@m.u

Definition in file maze_gen.c.

Typedef Documentation

typedef struct free_walls_struct free_walls_struct

Contains free walls in the map.

Function Documentation

static void fill_maze_full ( char **  maze, int  x, int  y, int  xsize, int  ysize, free_walls_struct *  free_walls  )

static

Recursive routine which will fill every available space in the maze with walls.

Parameters

maze	maze.
x
y	where to put a wall.
xsize
ysize	maze size.
free_walls	free walls list.

Definition at line 297 of file maze_gen.c.

References find_free_point(), pop_wall_point(), and free_walls_struct::wall_free_size.

Referenced by maze_gen().

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static void fill_maze_sparse ( char **  maze, int  x, int  y, int  xsize, int  ysize, free_walls_struct *  free_walls  )

static

Recursive routine which will fill much of the maze, but will leave some free spots (possibly large) toward the center.

Parameters

maze	maze.
x
y	where to put a wall.
xsize
ysize	maze size.
free_walls	free walls list.

Definition at line 329 of file maze_gen.c.

References find_free_point(), pop_wall_point(), and free_walls_struct::wall_free_size.

Referenced by maze_gen().

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static int find_free_point ( char **  maze, int *  x, int *  y, int  xc, int  yc, int  xsize, int  ysize  )

static

Randomly look for a square adjacent to this one where we can place a new block without closing a path. We may only look up, down, right, or left.

Parameters

	maze	current maze.
[out]	x
[out]	y	coordinates of the found point.
	xc
	yc	coordinates from where to look.
	xsize
	ysize	maze size.

Returns

-1 if no free spot, 0 else.

Definition at line 191 of file maze_gen.c.

Referenced by fill_maze_full(), and fill_maze_sparse().

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static void make_wall_free_list ( int  xsize, int  ysize, free_walls_struct *  free_walls  )

static

Inits the list of points where we can put walls on. The free wall points are those outer points which aren't corners or near corners, and don't have a maze wall growing out of them already.

Parameters

xsize
ysize	size of the map.
free_walls	structure to initialise. free_walls_struct::wall_free_size must be initialised.

Definition at line 123 of file maze_gen.c.

References free_walls_struct::wall_free_size, free_walls_struct::wall_x_list, and free_walls_struct::wall_y_list.

Referenced by maze_gen().

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char** maze_gen	(	int	xsize,
		int	ysize,
		int	option
	)

This function generates a random blocked maze with the property that there is only one path from one spot to any other, and there is always a path from one spot to any other.

Parameters

xsize
ysize	wanted map size.
option	if 0, maze will be sparse (sizeable rooms), else totally filled.

Returns

a char** array with # and . for closed and open respectively. a char value of 0 represents a blank space: a '#' is a wall.

Definition at line 68 of file maze_gen.c.

References fill_maze_full(), fill_maze_sparse(), make_wall_free_list(), pop_wall_point(), free_walls_struct::wall_free_size, free_walls_struct::wall_x_list, and free_walls_struct::wall_y_list.

Referenced by layoutgen().

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static void pop_wall_point ( int *  x, int *  y, free_walls_struct *  free_walls  )

static

Randomly returns one of the elements from the wall point list.

Parameters

[out]	x
[out]	y	coordinates of the point.
	free_walls	free walls list.

Definition at line 163 of file maze_gen.c.

References free_walls_struct::wall_free_size, free_walls_struct::wall_x_list, and free_walls_struct::wall_y_list.

Referenced by fill_maze_full(), fill_maze_sparse(), and maze_gen().

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