File:MAZE 30x20 DFS.gif
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MAZE_30x20_DFS.gif (732 × 492 pixels, file size: 4.5 MB, MIME type: image/gif, looped, 609 frames, 1 min 1 s)
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[edit]DescriptionMAZE 30x20 DFS.gif |
English: The generation of a maze using a depth-first search algorithm. This maze is 30x20 in size. The C++ source code used to create this can be seen at w:User:Purpy Pupple/Maze. |
Date | |
Source | Own work |
Author | Purpy Pupple |
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C src code
[edit]//Purpy Pupple's amazing maze generator.
//Released under the CC-BY-SA 3.0 License and the GFDL
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define UP 0 //-y
#define DOWN 1 //+y
#define LEFT 2 //-x
#define RIGHT 3 //+x
#define OUTFILE "MAZE"
#define WHITE fprintf(outfile, "%c%c%c", 255,255,255)
#define BLACK fprintf(outfile, "%c%c%c", 0,0,0)
#define RED fprintf(outfile, "%c%c%c", 0,0,255)
#define nodeadend//generate a maze without any dead ends! (consequently, many solutions to maze)
//#define prim //enable this to generate mazes using prim's algorithm.
#define backtrack//enable this to generate mazes using depth-first search. Don't enable both.
//#define movie //this option spams bitmaps to illustrate each step of generation.
long numin=1; //Number of cells in the maze.
const int xsize=152;
const int ysize=122;
void initialize();
void generate();
void savebmp(int xspecial, int yspecial);
struct cell{
bool in; //Is this cell in the maze?
bool up; //Does the wall above this cell exist?
bool left;//Does the wall to the left of this cell exist?
int prevx, prevy; //The coordinates of the previous cell, used for backtracking.
};
cell MAZE[xsize][ysize];
int main(){
srand((unsigned int)time(NULL)); //seed random number generator with system time
initialize(); //initialize the maze
generate(); //generate the maze
#ifdef movie
for(int i=1;i<10;i++){
numin++;
savebmp(0,0); //output the bitmap
}
#else movie
savebmp(0,0);
#endif
return 0;
}
void initialize(){
//Initialize the maze!
for(int x=0;x<xsize;x++){
for(int y=0;y<ysize;y++){
//The maze cells on the edges of the maze are "in" to provide padding. Otherwise, all maze cells are not in.
MAZE[x][y].in = (x==0||x==xsize-1||y==0||y==ysize-1)?1:0;
//All maze cells have all walls existing by default, except the perimeter cells.
MAZE[x][y].up = (x==0||x==xsize-1||y==0)?0:1;
MAZE[x][y].left = (x==0||y==0||y==ysize-1)?0:1;
}
}
return;
}
void generate(){
int xcur=1, ycur=1;//start growing from the corner. It could theoretically start growing from anywhere, doesn't matter.
MAZE[xcur][ycur].in = 1;
int whichway;
bool success;
do{
#ifdef movie
savebmp(xcur,ycur);
#endif
#ifdef nodeadend
if( MAZE[xcur][ycur-1].in&&MAZE[xcur][ycur+1].in&&
MAZE[xcur-1][ycur].in&&MAZE[xcur+1][ycur].in ){
//If at a dead end, randomly destroy a wall to make it not a dead end!
do{
success=0;
whichway=rand()%4;
switch(whichway){
case UP:
if(MAZE[xcur][ycur].up&&ycur!=1){
success=1;
MAZE[xcur][ycur].up=0;
}
break;
case DOWN:
if(MAZE[xcur][ycur+1].up&&ycur!=ysize-2){
success=1;
MAZE[xcur][ycur+1].up=0;
}
break;
case LEFT:
if(MAZE[xcur][ycur].left&&xcur!=1){
success=1;
MAZE[xcur][ycur].left=0;
}
break;
case RIGHT:
if(MAZE[xcur+1][ycur].left&&xcur!=xsize-2){
success=1;
MAZE[xcur+1][ycur].left=0;
}
break;
}
}while(!success);
}
#endif
#ifdef backtrack
while( MAZE[xcur][ycur-1].in&&MAZE[xcur][ycur+1].in&&
MAZE[xcur-1][ycur].in&&MAZE[xcur+1][ycur].in ){
//If all the neighbourhood cells are in, backtrack.
int xcur2=MAZE[xcur][ycur].prevx;
ycur=MAZE[xcur][ycur].prevy;
xcur=xcur2;
}
#endif
#ifdef prim
do{
//randomly find a cell that's in the maze
xcur=rand()%(xsize-2)+1;
ycur=rand()%(ysize-2)+1;
}while(!MAZE[xcur][ycur].in ||
MAZE[xcur][ycur-1].in&&MAZE[xcur][ycur+1].in&&
MAZE[xcur-1][ycur].in&&MAZE[xcur+1][ycur].in);
#endif
do{
//Randomly grow the maze if possible.
success=0;
whichway=rand()%4;
switch(whichway){
case UP:
if(!MAZE[xcur][ycur-1].in){
success=1;
MAZE[xcur][ycur].up=0;
MAZE[xcur][ycur-1].prevx=xcur;
MAZE[xcur][ycur-1].prevy=ycur;
ycur--;
}
break;
case DOWN:
if(!MAZE[xcur][ycur+1].in){
success=1;
MAZE[xcur][ycur+1].up=0;
MAZE[xcur][ycur+1].prevx=xcur;
MAZE[xcur][ycur+1].prevy=ycur;
ycur++;
}
break;
case LEFT:
if(!MAZE[xcur-1][ycur].in){
success=1;
MAZE[xcur][ycur].left=0;
MAZE[xcur-1][ycur].prevx=xcur;
MAZE[xcur-1][ycur].prevy=ycur;
xcur--;
}
break;
case RIGHT:
if(!MAZE[xcur+1][ycur].in){
success=1;
MAZE[xcur+1][ycur].left=0;
MAZE[xcur+1][ycur].prevx=xcur;
MAZE[xcur+1][ycur].prevy=ycur;
xcur++;
}
break;
}
}while(!success);
MAZE[xcur][ycur].in=1;
numin++; //Every iteration of this loop, one maze cell is added to the maze.
}while(numin<(xsize-2)*(ysize-2));
#ifdef movie
savebmp(xcur,ycur);
#endif
return;
}
void savebmp(int xspecial, int yspecial){
//save a bitmap file! the xspecial, yspecial pixel is coloured red.
FILE * outfile;
int extrabytes, paddedsize;
int x, y, n;
int width=(xsize-1)*2-1;
int height=(ysize-1)*2-1;
extrabytes = (4 - ((width * 3) % 4))%4;
char filename[200];
sprintf(filename, "%s_%dx%d_n%d.bmp", OUTFILE, xsize, ysize, numin);
paddedsize = ((width * 3) + extrabytes) * height;
unsigned int headers[13] = {paddedsize + 54, 0, 54, 40, width, height, 0, 0, paddedsize, 0, 0, 0, 0};
outfile = fopen(filename, "wb");
fprintf(outfile, "BM");
for (n = 0; n <= 5; n++){
fprintf(outfile, "%c", headers[n] & 0x000000FF);
fprintf(outfile, "%c", (headers[n] & 0x0000FF00) >> 8);
fprintf(outfile, "%c", (headers[n] & 0x00FF0000) >> 16);
fprintf(outfile, "%c", (headers[n] & (unsigned int) 0xFF000000) >> 24);
}
fprintf(outfile, "%c", 1);fprintf(outfile, "%c", 0);
fprintf(outfile, "%c", 24);fprintf(outfile, "%c", 0);
for (n = 7; n <= 12; n++){
fprintf(outfile, "%c", headers[n] & 0x000000FF);
fprintf(outfile, "%c", (headers[n] & 0x0000FF00) >> 8);
fprintf(outfile, "%c", (headers[n] & 0x00FF0000) >> 16);
fprintf(outfile, "%c", (headers[n] & (unsigned int) 0xFF000000) >> 24);
}
//Actual writing of data begins here:
for(y = 0; y <= height - 1; y++){
for(x = 0; x <= width - 1; x++){
if(x%2 == 1 && y%2 == 1){
if(x/2+1 == xspecial && y/2+1 == yspecial) RED;
else{
if(MAZE[x/2+1][y/2+1].in) WHITE; else BLACK;
}
}else if(x%2 == 0 && y%2 == 0){
BLACK;
}else if(x%2 == 0 && y%2 == 1){
if(MAZE[x/2+1][y/2+1].left) BLACK; else WHITE;
}else if(x%2 == 1 && y%2 == 0){
if(MAZE[x/2+1][y/2+1].up) BLACK; else WHITE;
}
}
if (extrabytes){ // See above - BMP lines must be of lengths divisible by 4.
for (n = 1; n <= extrabytes; n++){
fprintf(outfile, "%c", 0);
}
}
}
printf("file printed: %s\n", filename);
fclose(outfile);
return;
}
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[edit]I, the copyright holder of this work, hereby publish it under the following licenses:
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- You are free:
- to share – to copy, distribute and transmit the work
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- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
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current | 00:37, 5 December 2012 | ![]() | 732 × 492 (4.5 MB) | Dllu (talk | contribs) | User created page with UploadWizard |
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