C-Sharp Example of Dungeon-Building Algorithm
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(Made by Solarnus)
import java.util.*; //and for getting today's date
public class dungen{
//max size of the map
private int xmax = 80; //80 columns
private int ymax = 25; //25 rows
//size of the map
private int xsize = 0;
private int ysize = 0;
//number of "objects" to generate on the map
private int objects = 0;
//define the %chance to generate either a room or a corridor on the map
//BTW, rooms are 1st priority so actually it's enough to just define the chance
//of generating a room
private int chanceRoom = 75;
private int chanceCorridor = 25;
//our map
private int[] dungeon_map = new int[0];
//the old seed from the RNG is saved in this one
private long oldseed = 0;
//a list over tile types we're using
final private int tileUnused = 0;
final private int tileDirtWall = 1; //not in use
final private int tileDirtFloor = 2;
final private int tileStoneWall = 3;
final private int tileCorridor = 4;
final private int tileDoor = 5;
final private int tileUpStairs = 6;
final private int tileDownStairs = 7;
final private int tileChest = 8;
//misc. messages to print
private String msgXSize = "X size of dungeon: \t";
private String msgYSize = "Y size of dungeon: \t";
private String msgMaxObjects = "max # of objects: \t";
private String msgNumObjects = "# of objects made: \t";
private String msgHelp = "";
private String msgDetailedHelp = "";
//setting a tile's type
private void setCell(int x, int y, int celltype){
dungeon_map[x + xsize * y] = celltype;
}
//returns the type of a tile
private int getCell(int x, int y){
return dungeon_map[x + xsize * y];
}
//The RNG. the seed is based on seconds from the "java epoch" ( I think..)
//perhaps it's the same date as the unix epoch
private int getRand(int min, int max){
//the seed is based on current date and the old, already used seed
Date now = new Date();
long seed = now.getTime() + oldseed;
oldseed = seed;
Random randomizer = new Random(seed);
int n = max - min + 1;
int i = randomizer.nextInt() % n;
if (i < 0)
i = -i;
//System.out.println("seed: " + seed + "\tnum: " + (min + i));
return min + i;
}
private boolean makeCorridor(int x, int y, int lenght, int direction){
//define the dimensions of the corridor (er.. only the width and height..)
int len = getRand(2, lenght);
int floor = tileCorridor;
int dir = 0;
if (direction > 0 && direction < 4) dir = direction;
int xtemp = 0;
int ytemp = 0;
switch(dir){
case 0:
//north
//check if there's enough space for the corridor
//start with checking it's not out of the boundaries
if (x < 0 || x > xsize) return false;
else xtemp = x;
//same thing here, to make sure it's not out of the boundaries
for (ytemp = y; ytemp > (y-len); ytemp--){
if (ytemp < 0 || ytemp > ysize) return false; //oh boho, it was!
if (getCell(xtemp, ytemp) != tileUnused) return false;
}
//if we're still here, let's start building
for (ytemp = y; ytemp > (y-len); ytemp--){
setCell(xtemp, ytemp, floor);
}
break;
case 1:
//east
if (y < 0 || y > ysize) return false;
else ytemp = y;
for (xtemp = x; xtemp < (x+len); xtemp++){
if (xtemp < 0 || xtemp > xsize) return false;
if (getCell(xtemp, ytemp) != tileUnused) return false;
}
for (xtemp = x; xtemp < (x+len); xtemp++){
setCell(xtemp, ytemp, floor);
}
break;
case 2:
//south
if (x < 0 || x > xsize) return false;
else xtemp = x;
for (ytemp = y; ytemp < (y+len); ytemp++){
if (ytemp < 0 || ytemp > ysize) return false;
if (getCell(xtemp, ytemp) != tileUnused) return false;
}
for (ytemp = y; ytemp < (y+len); ytemp++){
setCell(xtemp, ytemp, floor);
}
break;
case 3:
//west
if (ytemp < 0 || ytemp > ysize) return false;
else ytemp = y;
for (xtemp = x; xtemp > (x-len); xtemp--){
if (xtemp < 0 || xtemp > xsize) return false;
if (getCell(xtemp, ytemp) != tileUnused) return false;
}
for (xtemp = x; xtemp > (x-len); xtemp--){
setCell(xtemp, ytemp, floor);
}
break;
}
//woot, we're still here! let's tell the other guys we're done!!
return true;
}
private boolean makeRoom(int x, int y, int xlength, int ylength, int direction){
//define the dimensions of the room, it should be at least 4x4 tiles (2x2 for walking on, the rest is walls)
int xlen = getRand(4, xlength);
int ylen = getRand(4, ylength);
//the tile type it's going to be filled with
int floor = tileDirtFloor; //jordgolv..
int wall = tileDirtWall; //jordv????gg
//choose the way it's pointing at
int dir = 0;
if (direction > 0 && direction < 4) dir = direction;
switch(dir){
case 0:
//north
//Check if there's enough space left for it
for (int ytemp = y; ytemp > (y-ylen); ytemp--){
if (ytemp < 0 || ytemp > ysize) return false;
for (int xtemp = (x-xlen/2); xtemp < (x+(xlen+1)/2); xtemp++){
if (xtemp < 0 || xtemp > xsize) return false;
if (getCell(xtemp, ytemp) != tileUnused) return false; //no space left...
}
}
//we're still here, build
for (int ytemp = y; ytemp > (y-ylen); ytemp--){
for (int xtemp = (x-xlen/2); xtemp < (x+(xlen+1)/2); xtemp++){
//start with the walls
if (xtemp == (x-xlen/2)) setCell(xtemp, ytemp, wall);
else if (xtemp == (x+(xlen-1)/2)) setCell(xtemp, ytemp, wall);
else if (ytemp == y) setCell(xtemp, ytemp, wall);
else if (ytemp == (y-ylen+1)) setCell(xtemp, ytemp, wall);
//and then fill with the floor
else setCell(xtemp, ytemp, floor);
}
}
break;
case 1:
//east
for (int ytemp = (y-ylen/2); ytemp < (y+(ylen+1)/2); ytemp++){
if (ytemp < 0 || ytemp > ysize) return false;
for (int xtemp = x; xtemp < (x+xlen); xtemp++){
if (xtemp < 0 || xtemp > xsize) return false;
if (getCell(xtemp, ytemp) != tileUnused) return false;
}
}
for (int ytemp = (y-ylen/2); ytemp < (y+(ylen+1)/2); ytemp++){
for (int xtemp = x; xtemp < (x+xlen); xtemp++){
if (xtemp == x) setCell(xtemp, ytemp, wall);
else if (xtemp == (x+xlen-1)) setCell(xtemp, ytemp, wall);
else if (ytemp == (y-ylen/2)) setCell(xtemp, ytemp, wall);
else if (ytemp == (y+(ylen-1)/2)) setCell(xtemp, ytemp, wall);
else setCell(xtemp, ytemp, floor);
}
}
break;
case 2:
//south
for (int ytemp = y; ytemp < (y+ylen); ytemp++){
if (ytemp < 0 || ytemp > ysize) return false;
for (int xtemp = (x-xlen/2); xtemp < (x+(xlen+1)/2); xtemp++){
if (xtemp < 0 || xtemp > xsize) return false;
if (getCell(xtemp, ytemp) != tileUnused) return false;
}
}
for (int ytemp = y; ytemp < (y+ylen); ytemp++){
for (int xtemp = (x-xlen/2); xtemp < (x+(xlen+1)/2); xtemp++){
if (xtemp == (x-xlen/2)) setCell(xtemp, ytemp, wall);
else if (xtemp == (x+(xlen-1)/2)) setCell(xtemp, ytemp, wall);
else if (ytemp == y) setCell(xtemp, ytemp, wall);
else if (ytemp == (y+ylen-1)) setCell(xtemp, ytemp, wall);
else setCell(xtemp, ytemp, floor);
}
}
break;
case 3:
//west
for (int ytemp = (y-ylen/2); ytemp < (y+(ylen+1)/2); ytemp++){
if (ytemp < 0 || ytemp > ysize) return false;
for (int xtemp = x; xtemp > (x-xlen); xtemp--){
if (xtemp < 0 || xtemp > xsize) return false;
if (getCell(xtemp, ytemp) != tileUnused) return false;
}
}
for (int ytemp = (y-ylen/2); ytemp < (y+(ylen+1)/2); ytemp++){
for (int xtemp = x; xtemp > (x-xlen); xtemp--){
if (xtemp == x) setCell(xtemp, ytemp, wall);
else if (xtemp == (x-xlen+1)) setCell(xtemp, ytemp, wall);
else if (ytemp == (y-ylen/2)) setCell(xtemp, ytemp, wall);
else if (ytemp == (y+(ylen-1)/2)) setCell(xtemp, ytemp, wall);
else setCell(xtemp, ytemp, floor);
}
}
break;
}
//yay, all done
return true;
}
//used to print the map on the screen
public void showDungeon(){
for (int y = 0; y < ysize; y++){
for (int x = 0; x < xsize; x++){
//System.out.print(getCell(x, y));
switch(getCell(x, y)){
case tileUnused:
System.out.print(" ");
break;
case tileDirtWall:
System.out.print("+");
break;
case tileDirtFloor:
System.out.print(".");
break;
case tileStoneWall:
System.out.print("O");
break;
case tileCorridor:
System.out.print("#");
break;
case tileDoor:
System.out.print("D");
break;
case tileUpStairs:
System.out.print("<");
break;
case tileDownStairs:
System.out.print(">");
break;
case tileChest:
System.out.print("*");
break;
};
}
if (xsize < xmax) System.out.print("\n");
}
}
//and here's the one generating the whole map
public boolean createDungeon(int inx, int iny, int inobj){
if (inobj < 1) objects = 10;
else objects = inobj;
//justera kartans storlek, om den ????r st????rre eller mindre ????n "gr????nserna"
//adjust the size of the map, if it's smaller or bigger than the limits
if (inx < 3) xsize = 3;
else if (inx > xmax) xsize = xmax;
else xsize = inx;
if (iny < 3) ysize = 3;
else if (iny > ymax) ysize = ymax;
else ysize = iny;
System.out.println(msgXSize + xsize);
System.out.println(msgYSize + ysize);
System.out.println(msgMaxObjects + objects);
//redefine the map var, so it's adjusted to our new map size
dungeon_map = new int[xsize * ysize];
//start with making the "standard stuff" on the map
for (int y = 0; y < ysize; y++){
for (int x = 0; x < xsize; x++){
//ie, making the borders of unwalkable walls
if (y == 0) setCell(x, y, tileStoneWall);
else if (y == ysize-1) setCell(x, y, tileStoneWall);
else if (x == 0) setCell(x, y, tileStoneWall);
else if (x == xsize-1) setCell(x, y, tileStoneWall);
//and fill the rest with dirt
else setCell(x, y, tileUnused);
}
}
/*******************************************************************************
And now the code of the random-map-generation-algorithm begins!
*******************************************************************************/
//start with making a room in the middle, which we can start building upon
makeRoom(xsize/2, ysize/2, 8, 6, getRand(0,3)); //getrand saken f????r att slumpa fram riktning p?? rummet
//keep count of the number of "objects" we've made
int currentFeatures = 1; //+1 for the first room we just made
//then we sart the main loop
for (int countingTries = 0; countingTries < 1000; countingTries++){
//check if we've reached our quota
if (currentFeatures == objects){
break;
}
//start with a random wall
int newx = 0;
int xmod = 0;
int newy = 0;
int ymod = 0;
int validTile = -1;
//1000 chances to find a suitable object (room or corridor)..
//(yea, i know it's kinda ugly with a for-loop... -_-')
for (int testing = 0; testing < 1000; testing++){
newx = getRand(1, xsize-1);
newy = getRand(1, ysize-1);
validTile = -1;
//System.out.println("tempx: " + newx + "\ttempy: " + newy);
if (getCell(newx, newy) == tileDirtWall || getCell(newx, newy) == tileCorridor){
//check if we can reach the place
if (getCell(newx, newy+1) == tileDirtFloor || getCell(newx, newy+1) == tileCorridor){
validTile = 0; //
xmod = 0;
ymod = -1;
}
else if (getCell(newx-1, newy) == tileDirtFloor || getCell(newx-1, newy) == tileCorridor){
validTile = 1; //
xmod = +1;
ymod = 0;
}
else if (getCell(newx, newy-1) == tileDirtFloor || getCell(newx, newy-1) == tileCorridor){
validTile = 2; //
xmod = 0;
ymod = +1;
}
else if (getCell(newx+1, newy) == tileDirtFloor || getCell(newx+1, newy) == tileCorridor){
validTile = 3; //
xmod = -1;
ymod = 0;
}
//check that we haven't got another door nearby, so we won't get alot of openings besides
//each other
if (validTile > -1){
if (getCell(newx, newy+1) == tileDoor) //north
validTile = -1;
else if (getCell(newx-1, newy) == tileDoor)//east
validTile = -1;
else if (getCell(newx, newy-1) == tileDoor)//south
validTile = -1;
else if (getCell(newx+1, newy) == tileDoor)//west
validTile = -1;
}
//if we can, jump out of the loop and continue with the rest
if (validTile > -1) break;
}
}
if (validTile > -1){
//choose what to build now at our newly found place, and at what direction
int feature = getRand(0, 100);
if (feature <= chanceRoom){ //a new room
if (makeRoom((newx+xmod), (newy+ymod), 8, 6, validTile)){
currentFeatures++; //add to our quota
//then we mark the wall opening with a door
setCell(newx, newy, tileDoor);
//clean up infront of the door so we can reach it
setCell((newx+xmod), (newy+ymod), tileDirtFloor);
}
}
else if (feature >= chanceRoom){ //new corridor
if (makeCorridor((newx+xmod), (newy+ymod), 6, validTile)){
//same thing here, add to the quota and a door
currentFeatures++;
setCell(newx, newy, tileDoor);
}
}
}
}
/*******************************************************************************
All done with the building, let's finish this one off
*******************************************************************************/
//sprinkle out the bonusstuff (stairs, chests etc.) over the map
int newx = 0;
int newy = 0;
int ways = 0; //from how many directions we can reach the random spot from
int state = 0; //the state the loop is in, start with the stairs
while (state != 10){
for (int testing = 0; testing < 1000; testing++){
newx = getRand(1, xsize-1);
newy = getRand(1, ysize-2); //cheap bugfix, pulls down newy to 0<y<24, from 0<y<25
//System.out.println("x: " + newx + "\ty: " + newy);
ways = 4; //the lower the better
//check if we can reach the spot
if (getCell(newx, newy+1) == tileDirtFloor || getCell(newx, newy+1) == tileCorridor){
//north
if (getCell(newx, newy+1) != tileDoor)
ways--;
}
if (getCell(newx-1, newy) == tileDirtFloor || getCell(newx-1, newy) == tileCorridor){
//east
if (getCell(newx-1, newy) != tileDoor)
ways--;
}
if (getCell(newx, newy-1) == tileDirtFloor || getCell(newx, newy-1) == tileCorridor){
//south
if (getCell(newx, newy-1) != tileDoor)
ways--;
}
if (getCell(newx+1, newy) == tileDirtFloor || getCell(newx+1, newy) == tileCorridor){
//west
if (getCell(newx+1, newy) != tileDoor)
ways--;
}
if (state == 0){
if (ways == 0){
//we're in state 0, let's place a "upstairs" thing
setCell(newx, newy, tileUpStairs);
state = 1;
break;
}
}
else if (state == 1){
if (ways == 0){
//state 1, place a "downstairs"
setCell(newx, newy, tileDownStairs);
state = 10;
break;
}
}
}
}
//all done with the map generation, tell the user about it and finish
System.out.println(msgNumObjects + currentFeatures);
return true;
}
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
public static void main(String[] args){
//initial stuff used in making the map
int x = 80; int y = 25; int dungeon_objects = 0;
//convert a string to a int, if there's more then one arg
if (args.length >= 1)
dungeon_objects = Integer.parseInt(args[0]);
if (args.length >= 2)
x = Integer.parseInt(args[1]);
if (args.length >= 3)
y = Integer.parseInt(args[2]);
//create a new class of "dungen", so we can use all the goodies within it
dungen generator = new dungen();
//then we create a new dungeon map
if (generator.createDungeon(x, y, dungeon_objects)){
//always good to be able to see the results..
generator.showDungeon();
}
}
}