nexus/map.c

#include <assert.h>
#include <math.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "defs.h"
#include "nexus.h"
#include "lf.h"
#include "map.h"
#include "objects.h"

extern map_t *firstmap,*lastmap;
extern int viewx,viewy,vieww,viewh;
extern lifeform_t *player;

cell_t *addcell(map_t *m, int x, int y) {
	cell_t *cell;
	m->cell[(y*m->w)+x] = malloc(sizeof(cell_t));
	cell = m->cell[(y*m->w)+x];
	cell->map = m;
	cell->x = x;
	cell->y = y;
	setcelltype(cell, CT_WALL);
	cell->visited = B_FALSE;
	cell->obpile = addobpile(NOOWNER, cell);
	cell->lf = NULL;
	cell->roomid = -1;
}

map_t *addmap(void) {
        map_t *a;
	int id;
	int i;
	// is there already a map?
	if (lastmap) {
		id = lastmap->id + 1;
	} else {
		id = 0;
	} 

        // add to the end of the list 
        if (firstmap == NULL) {
                firstmap = malloc(sizeof(map_t));
                a = firstmap;
                a->prev = NULL;
        } else {
                // go to end of list
                a = lastmap;
                a->next = malloc(sizeof(map_t));
                a->next->prev = a;
                a = a->next;
        }
        lastmap = a;
        a->next = NULL;

	// props
	a->id = id;
	a->lf = NULL;
	a->nextlfid = 0;
	for (i = 0; i < MAXDIR_ORTH; i++) {
		a->nextmap[i] = -1;
	}
	return a;
}

void addrandomthing(cell_t *c) {
	char buf[BUFLEN];
	int level;
	race_t *r;

	// if there's already someone there,
	// then add an object.
	if (c->lf || (rnd(1,2) == 1)) {
		// object
		if (getrandomob(c->map, buf)) {
			dblog("adding %s to cell %d,%d",buf,c->x,c->y);
			addob(c->obpile, buf);
		}
	} else {
		r = getrandomlf(c->map, &level);
		if (r) {
			dblog("adding %s to cell %d,%d",buf,c->x,c->y);
			addlf(c, r->id, level);
		}
	}
}

cell_t *getcellat(map_t *map, int x, int y) {
	if (!isonmap(map, x, y)) return NULL;
	return map->cell[y*map->w + x];
}

int getcelldist(cell_t *src, cell_t *dst) {
	double xd,yd;
	// use pythag
	xd = abs(dst->x - src->x);
	yd = abs(dst->y - src->y);
	return (int)sqrt(xd*xd + yd*yd);
}

int calcroompos(map_t *map, int w, int h, int *bx, int *by) {
	int x,y;
	int bestx = -1, besty = -1;
	int valid = B_FALSE;
	int bestscore = 9999;
	cell_t *cell;

	// try placing room at all positions
	for (y = 0; y < map->h; y++) {
		for (x = 0; x < map->w; x++) {
			// would the room fit here?
			if ( ((x + (w-1)) <= (map->w-1)) && 
			     ((y + (h-1)) <= (map->h-1))) { 
				int score = 0;
				int rx,ry;
				int notpossible = B_FALSE;
				valid = B_FALSE;
				// calculate score based on cells in room
				for (ry = y; (ry < y+h) && (!notpossible); ry++) {
					for (rx = x; (rx < x+w) && (!notpossible); rx++) {
						cell = getcellat(map, rx,ry);
						// is this cell adjacent to an empty cell?
						if (countcellexits(cell)) {
							score++;
							valid = B_TRUE;
						}
						// is this cell empty itself?
						if (!cell->type->solid) score += 3;
						// avoid being adjacent to other room walls
						if (countcellexits(cell)) score++;
						score += (countadjcellsoftype(cell, CT_ROOMWALL)*3);
						// overlapping another room?
						if (cell->type->id == CT_ROOM) { 
							valid = B_FALSE;
							notpossible = B_TRUE;
						}
						if (cell->type->id == CT_ROOMWALL) {
							valid = B_FALSE;
							notpossible = B_TRUE;
						}
					}
				}
				if (valid && (score != 0) && (score < bestscore)) {
					bestscore = score;
					bestx = x;
					besty = y;
				}
			}
		}
	}

	*bx = bestx;
	*by = besty;

	if ((bestx == -1) || (besty == -1)) {
		return B_TRUE;
	}

	return B_FALSE;
}

int countadjcellsoftype(cell_t *cell, int id) {
	int d;
	int count = 0;
	cell_t *newcell;
	for (d = D_N; d < MAXDIR_ORTH; d++) {
		newcell = getcellindir(cell, d);
		if (newcell && newcell->type->id == id) {
			count++;
		}
	}
	return count;
}

int countcellexits(cell_t *cell) {
	int d;
	int exits = 0;
	cell_t *newcell;
	assert(cell);
	for (d = D_N; d < MAXDIR_ORTH; d++) {
		newcell = getcellindir(cell, d);
		if (newcell && !newcell->type->solid) {
			exits++;
		}
	}
	return exits;
}

/*
	seed = random number seed
	turnpct = percentage change of a corridor turning
	sparseness = how many times to chop off dead ends
	looppct = percentage change of turning dead-end into loop
	maxrooms = max # of rooms
*/
void createmap(map_t *map, int habitat) {
	lifeform_t *lf;
	char buf[BUFLEN];
	int wantrooms = B_TRUE;
	int x,y,newx,newy;
	int d;
	int i;
	int done,unused;
	int dir;
	int lastdir;
	int numrooms = 0;
	int roomw[MAXROOMS],roomh[MAXROOMS];
	//int roomspecial[MAX_MAPROOMS];
	int minroomw = MIN_ROOMW;
	int minroomh = MIN_ROOMH;
	int maxroomw = MAX_ROOMW;
	int maxroomh = MAX_ROOMH;
	int bestx,besty;
	int w,h;
	int startdir,forcex,forcey,ntries;
	cell_t *cell;
	//object_t *o;

	// parameters
	int turnpct = DEF_TURNPCT;
	int sparseness = DEF_SPARSENESS;
	int looppct = DEF_LOOPPCT;
	int minrooms = MINROOMS;
	int maxrooms = MAXROOMS;

	int moved = 0;

	int db = B_TRUE;

	sprintf(buf, "Map %d",map->id);
	map->name = strdup(buf);
	map->habitat = habitat;

	for (i = 0; i < MAXDIR_ORTH; i++) {
		map->nextmap[i] = -1;
	}

	map->w = MAX_MAPW;
	map->h = MAX_MAPH;

	// rememebr seed
	map->seed = rand() % 65535;

	// fill entire maze with walls
	for (y = 0; y < map->h; y++) {
		for (x = 0; x < map->w; x++) {
			addcell(map, x, y);
		}
	}

	// pick initial random spot 
	cell = getrandomcell(map);
	setcelltype(cell, CT_CORRIDOR);
	cell->visited = B_TRUE;
	//if (db) printf("- Starting (%d,%d)\n",cell->x, cell->y);

	lastdir = D_UNKNOWN;
	done = B_FALSE;

	dir = D_NONE;

	while (!done) {
		// get random direction based on turnpct
		dir = D_NONE;
		while (dir == D_NONE) {	
			int badcount;
			//if (db) printf("- At (%d,%d), moved %d, finding new direction...\n",cell->x, cell->y, moved);
		
			dir = getnewdigdir(cell, lastdir, (moved < 2) ? 0 : turnpct, &moved);

			badcount = 0;
			while (dir == D_NONE) {
				badcount++;
				if (badcount > 10) {
					// finish!
					done = B_TRUE;
					break;
				}
				
				// pick new EMPTY random spot
				cell = getrandomcell(map);
				while (cell->type->solid) {
					cell = getrandomcell(map);
				}
				//if (db) printf("--- Couldn't find a valid direction.  Jumped to (%d,%d).\n",cell->x, cell->y);
				// pick a new random dir
				dir = getnewdigdir(cell, lastdir, turnpct, &moved);
			}
			if (!done) {
				//if (db) printf("- Digging %s from (%d,%d).\n",getdirname(dir),cell->x, cell->y);
			}
		}

		if (!done) {
			// move to adjacent cell in the given direction
			cell = getcellindir(cell, dir);
			//if (db) printf("- Now at (%d,%d)\n",cell->x, cell->y);
			moved++;
			
			// blank it
			setcelltype(cell,CT_CORRIDOR);
			cell->visited = B_TRUE;
			// mark surrounding cells as visited
			for (d = DC_N; d < MAXDIR_COMPASS; d++) {
				cell_t *thiscell;
				thiscell = getcellindir(cell, d);
				if (thiscell) {
					//if (db) printf("* Marking surrounding cell in dir %d (%d,%d) as visited.\n",d, thiscell->x, thiscell->y);
					thiscell->visited = B_TRUE;
				}
			}
			// remember last direction
			lastdir = dir;

			// check if we have visited all valid cells
			unused = 0;
			for (y = 0; y < map->h; y++) {
				for (x = 0; x < map->w; x++) {
					cell_t *thiscell;
					thiscell = getcellat(map, x, y);
					if (!thiscell->visited) {
						unused++;
					}
				}
			}

			if (!unused) {
				done = B_TRUE;
			}
		}

		//printf("%d unused cell(s)\n",unused);
		//dumpmap(map);
		//getchar();

	}

	// use sparseness to cut down dead ends
	for (i = 0; i < sparseness; i++) {
		for (y = 0; y < map->h; y++) {
			for (x = 0; x < map->w; x++) {
				cell = getcellat(map, x,y);
				if (countcellexits(cell) == 1) {
					// erase this cell	
					setcelltype(cell, CT_WALL);
				}
			}
		}
	}

	

	// introduce loops
	for (y = 0; y < map->h; y++) {
		for (x = 0; x < map->w; x++) {
			cell = getcellat(map, x, y);
			if (!cell->type->solid && countcellexits(cell) == 1) {
				// dead end - maybe make loop from here
				if (rnd(1,100) <= looppct) {
					int connected = B_FALSE;
					int loopok = B_TRUE;
					int dir;

					// pick a random directory
					dir = getnewdigdir(cell, D_UNKNOWN,100, &moved);
				
					if (dir == D_NONE) {	
						// can't make a loop from here.
						loopok = B_FALSE;
					} else { 
						int tries = 0;
						// if we go this dir, will we hit a 
						// corridor?
						while (!isloopdirok(cell, dir)) {
							tries++;
							// tried every direction?
							if (tries >= MAXDIR_ORTH) {
								loopok = B_FALSE;
								break;
							}
							// turn... 
							if (++dir >= MAXDIR_ORTH) {
								dir = 0;
							}
						}
					}

					if (loopok) {
						// keep digging until we hit another corridor
						while (!connected) { 
							cell_t *newcell;
							// find adjacent cell in the given direction
							newcell = getcellindir(cell, dir);
							if (!newcell) {
								connected = B_TRUE;
							} else {
								// have we hit another corridor yet?
								if (!newcell->type->solid) {
									connected = B_TRUE;
								} else {
									// blank adjacent cell
									setcelltype(newcell, CT_CORRIDOR);
									newcell->visited = B_TRUE;
								}
								cell = newcell;
							}
						}
					}
				}
			}
		}
	}

	
	// create rooms
	if (wantrooms) {
		numrooms = rnd(minrooms, maxrooms);

		//printf("using %d rooms\n",numrooms);
		//dblog("Adding %d rooms...\n",numrooms);
		for (i = 0; i < numrooms; i++) {
			// select random width/height
			w = rnd(minroomw, maxroomw);
			h = rnd(minroomh, maxroomh);

			roomw[i] = w;
			roomh[i] = h;

			if (calcroompos(map, w, h, &bestx, &besty)) {
				//printf("** couldn't make room!\n");
			} else {
				// we now have the room position - fill it in
				createroom(map, bestx,besty, w,h, i);

				/*
				// maybe make it a special room
				if (getrand(1,100) <= CH_SPECIALROOM) {
					int curpos;
					int roomid;
					roomid = getrandomspecialroom(wreck->mazelev[curz].type);
					for (y = besty; y <= (besty + (h-1)); y++) {
						for (x = bestx; x <= (bestx + (w-1)); x++) {
							curpos = y*MAZEW+x;
							wreck->mazelev[curz].maze[curpos].floorver = roomid;
						}
					}
					roomspecial[i] = roomid;
				} else {
					roomspecial[i] = B_FALSE;
				}
				*/
			}
		}
	}



	/* void around map
	// N
	if (wreck->mazelev[0].type == W_WRECK) {
		for (x = 0; x < MAZEW; x++) {
			y = 0;
			while (getfloor(x,y,curz) == C_SOLID) {
				// change to void
				wreck->mazelev[curz].maze[y*MAZEW+x].floor = C_VOID;
				wreck->mazelev[curz].maze[y*MAZEW+x].floorver = rand() % MAXVOIDVER;
				// make exits breakable or remove them.
				for (d = D_NORTH ; d <= D_WEST; d++) {
					int extype = getexit(x,y,curz,d);
					int newx,newy;
					newx = x + dirtox(d);
					newy = y + dirtoy(d);
					if (isonmap(newx, newy, curz)) {
						if (issolid(newx,newy,curz)) {
							// remove it
							setexit(x,y,curz,d,EX_CORRIDOR);
						} else {
							object_t *o;
							// make it vulnerable
							if (isbreakableexit(extype)) {
								setexit(x,y,curz,d,extype);
							}
							// add warning sign
							o = addobject(&wreck->mazelev[curz].maze[newy*MAZEW+newx].floorobs, O_SIGNWARNING);
							o->dir =  diropposite(d);
						}
					}
				}
				y++;
			}
		}
		// S
		for (x = 0; x < MAZEW; x++) {
			y = MAZEH-1;
			while (getfloor(x,y,curz) == C_SOLID) {
				// change to void
				wreck->mazelev[curz].maze[y*MAZEW+x].floor = C_VOID;
				wreck->mazelev[curz].maze[y*MAZEW+x].floorver = rand() % MAXVOIDVER;
				// make exits breakable.
				for (d = D_NORTH ; d <= D_WEST; d++) {
					int extype = getexit(x,y,curz,d);
					int newx,newy;
					newx = x + dirtox(d);
					newy = y + dirtoy(d);
					if (isonmap(newx, newy, curz)) {
						if (issolid(newx,newy,curz)) {
							// remove it
							setexit(x,y,curz,d,EX_CORRIDOR);
						} else {
							object_t *o;
							// make it vulnerable
							if (isbreakableexit(extype)) {
								setexit(x,y,curz,d,extype);
							}
							// add warning sign
							o = addobject(&wreck->mazelev[curz].maze[newy*MAZEW+newx].floorobs, O_SIGNWARNING);
							o->dir =  diropposite(d);
						}
					}
				}
				y--;
			}
		}
		// E
		for (y = 0; y < MAZEH; y++) {
			x = 0;
			while (getfloor(x,y,curz) == C_SOLID) {
				// change to void
				wreck->mazelev[curz].maze[y*MAZEW+x].floor = C_VOID;
				wreck->mazelev[curz].maze[y*MAZEW+x].floorver = rand() % MAXVOIDVER;
				// make exits breakable.
				for (d = D_NORTH ; d <= D_WEST; d++) {
					int extype = getexit(x,y,curz,d);
					int newx,newy;
					newx = x + dirtox(d);
					newy = y + dirtoy(d);
					if (isonmap(newx, newy, curz)) {
						if (issolid(newx,newy,curz)) {
							// remove it
							setexit(x,y,curz,d,EX_CORRIDOR);
						} else {
							object_t *o;
							// make it vulnerable
							if (isbreakableexit(extype)) {
								setexit(x,y,curz,d,extype);
							}
							// add warning sign
							o = addobject(&wreck->mazelev[curz].maze[newy*MAZEW+newx].floorobs, O_SIGNWARNING);
							o->dir =  diropposite(d);
						}
					}
				}
				x++;
			}
		}
		// W
		for (y = 0; y < MAZEH; y++) {
			x = MAZEW-1;
			while (getfloor(x,y,curz) == C_SOLID) {
				// change to void
				wreck->mazelev[curz].maze[y*MAZEW+x].floor = C_VOID;
				wreck->mazelev[curz].maze[y*MAZEW+x].floorver = rand() % MAXVOIDVER;
				// make exits breakable.
				for (d = D_NORTH ; d <= D_WEST; d++) {
					int extype = getexit(x,y,curz,d);
					int newx,newy;
					newx = x + dirtox(d);
					newy = y + dirtoy(d);
					if (isonmap(newx, newy, curz)) {
						if (issolid(newx,newy,curz)) {
							// remove it
							setexit(x,y,curz,d,EX_CORRIDOR);
						} else {
							object_t *o;
							// make it vulnerable
							if (isbreakableexit(extype)) {
								setexit(x,y,curz,d,extype);
							}
							// add warning sign
							o = addobject(&wreck->mazelev[curz].maze[newy*MAZEW+newx].floorobs, O_SIGNWARNING);
							o->dir =  diropposite(d);
						}
					}
				}
				x--;
			}
		}
	}
	*/

	/*
	// add windows to map
	for (y = 0; y < MAZEH; y++) {
		for (x = 0; x < MAZEW; x++) {
			int dir,chance = windowchance;
			// increase chance for adjacent windows
			for (dir = D_NORTH ; dir <= D_WEST ; dir++) {
				int adjx,adjy;
				adjx = x + dirtox(dir);
				adjy = y + dirtoy(dir);
				if (isonmap(adjx,adjy,curz)) {
					// extra chance per adjacent window
					chance += (hasexitoftype(adjx,adjy,curz,EX_WINDOW)*10);
				}
			}
			for (dir = D_NORTH ; dir <= D_WEST ; dir++) {
				int etype,newx,newy,thisfloor,newfloor;
				etype = getexit(x,y,curz,dir);
				newx = x + dirtox(dir);
				newy = y + dirtoy(dir);
				if (isonmap(newx,newy,curz)) {
					thisfloor = wreck->mazelev[curz].maze[y*MAZEW+x].floor;
					newfloor = wreck->mazelev[curz].maze[newy*MAZEW+newx].floor;
					if ((etype == EX_WALL) && canhavewindow(thisfloor) && canhavewindow(newfloor)) {
						if (getrand(1,100) <= chance) {
							setexit(x,y,curz,dir,EX_WINDOW);
						}
					
					}
				}
			}
		}
	}
	*/

	// add objects and monsters to dead ends 
	for (y = 0; y < map->h; y++) {
		for (x = 0; x < map->w; x++) {
			cell_t *c;
			int obchance;
			c = getcellat(map, x, y);
			if (c && !c->type->solid) {
				if (rnd(1,100) <= getobchance(map->habitat)) {
					addrandomthing(c);
				}
			}
		}
	}

	if (wantrooms && (numrooms > 0)) {
		// add pillars & objects & monsters to rooms
		for (i = 0; i < numrooms; i++) {
			int numobsmin,numobsmax,numobs,n;
			int x,y;
			int maxpillars;

			//dblog("Adding obs to room %d/%d",i+1,numrooms);
			maxpillars = (roomw[i] / 4) + (roomh[i] / 4);
			// add pillars first
			if ((maxpillars > 0) && (rnd(1,100) <= CH_PILLAR)) {
				int n;
				int numpillars;
				numpillars = rnd(1,maxpillars);
				dblog("--> Will add %d pillars",numpillars);
				for (n = 0; n < numpillars;n++ ) {
					//dblog("----> Adding pillar %d/%d",n+1,numpillars);
					cell_t *c;
					c = getrandomroomcell(map, i);

					if (c && !c->type->solid && !countobs(c->obpile)) {
						setcelltype(cell, CT_WALL);
					}
				}
			}

			/*
			if (roomspecial[i]) {
				// chance is increased
				numobsmin = (roomw[i]*roomh[i]) / 4 ; 
				numobsmax = (roomw[i]*roomh[i]) / 2 ; 
			} else {
			*/
			numobsmin = 0;
			numobsmax = MAXOF(roomw[i],roomh[i]);
		
			//}

			// then objects/monsters
			if (numobsmax <= numobsmin) {
				numobs = numobsmin;
			} else {
				numobs = rnd(numobsmin,numobsmax);
			}
			dblog("--> Will add %d objects to room %d (of %d)",numobs,i,numrooms);
			for (n = 0 ; n < numobs; n++) {
				int ntries = 0;
				cell_t *c;
				done = B_FALSE;
				while (!done) {
					c = getrandomroomcell(map, i);
					// if nothing there
					if (c && !countobs(c->obpile)) {
						/*
						if (roomspecial[i]) {
							if (getrand(1,4) == 1) { // less chance of monster
								addlifeform(x, y, curz,getrandommonster(curz), 
									getrand(1,curz+1), C_AI, B_FALSE, B_TRUE);
							} else {
								//add objects based on room type
								if (roomspecial[i] == SP_MEDLAB) {
									addspecialroomob(x, y, curz, SP_MEDLAB,
										OR, 3, OP_AI_HEALS, OP_REVIVES);
								} else if (roomspecial[i] == SP_COMPLAB) {
									addspecialroomob(x, y, curz, SP_COMPLAB,
										OR, 0);
								} else if (roomspecial[i] == SP_ALIENNEST) {
									addspecialroomob(x, y, curz, SP_ALIENNEST,
										OR, 0);
								}
							}
						} else {
						*/
						addrandomthing(c);
						done = B_TRUE;
						//dblog("----> Success ob at (%d,%d).",c->x,c->y);
					} else {
						ntries++;
						//dblog("----> Failed, now at retry #%d/%d",ntries, numobs);
					}

					if (ntries >= numobs) {
						break;
					}
				}
			}
			
		}
	}

	dblog("Finished adding objects.");

	/*
	// some extra monsters in corridors
	for (i = 0; i < getrand(3,8); i++) {
		int x,y;
		lifeform_t *lf;
		lf = addlifeform(rand() % MAZEW, rand() % MAZEH,curz,getrandommonster(curz), getrand(1,curz+1), C_AI, B_FALSE, B_TRUE);
		done = B_FALSE;
		while (!done) {
			getrandomcell(&x, &y, curz,C_EMPTY );
			if (isempty(x,y,curz)) {
				lf->x = x;
				lf->y = y;
				lf->z = curz;
				done = B_TRUE;
			}
		}
	}
	*/


	/*

	// add a fixed revival booth
	done = B_FALSE;
	while (!done) {
		getrandomcell(&x,&y, curz,C_ROOM); // get a random cell in a room
		if (isempty(x,y,curz)) {
			if (!cellhasobject(x,y,curz)) {
				done = B_TRUE;
			}
		}
	}
	addobject(&wreck->mazelev[curz].maze[y*MAZEW+x].floorobs, O_REVIVAL);
	
	// emergency lighting
	for (y = 0; y < MAZEH; y++) {
		for (x = 0; x < MAZEW; x++) {
			if (getfloor(x,y,curz) == C_EMPTY) {
				if (isempty(x,y,curz) && !hasdangerousobject(NULL,x,y,curz)) {
					// chance of a light...
					int lightchance = 5;
					int roll = getrand(1,100);
					if (roll <= lightchance) {
						addobject(&wreck->mazelev[curz].maze[y*MAZEW+x].floorobs, O_EMERGLIGHT);
					}
				}
			}
		}
	}

	// add the reactor
	done = B_FALSE;
	while (!done) {
		getrandomcell(&x,&y, curz,C_ROOM); // get a random cell in a room
		if (getdistance(x,y,wreck->dockpos.x,wreck->dockpos.y) >= 20)  {
			if (isempty(x,y,curz)) {
				if (!cellhasobject(x,y,curz)) {
					done = B_TRUE;
				}
			}
		}
	}
	wreck->mazelev[curz].reactorpos.x = x;
	wreck->mazelev[curz].reactorpos.y = y;
	addobject(&wreck->mazelev[curz].maze[y*MAZEW+x].floorobs, O_REACTOR);
	wreck->mazelev[curz].powered = B_TRUE;
	wreck->mazelev[curz].lightlevel = getrand(50,100);

//printf("reactor at  %d,%d,%d\n",x,y,curz);

	// all empty cells around it change
	for (cury = y-2 ; cury <= y+2; cury++) {
		for (curx = x-2 ; curx <= x+2; curx++) {
			if (isonmap(curx,cury,curz)) {
				if (!issolid(curx,cury,curz)) {
					wreck->mazelev[curz].maze[cury*MAZEW+curx].floor = C_EMPTYHAZARD;
				}
			}
		}
	}
	
	
	// calculate level difficulty
	wreck->mazelev[curz].mondifficulty = 0;
	wreck->mazelev[curz].mapdifficulty = 0;
	
	// monsters
	for (lf = wreck->mazelev[curz].lifeform ; lf ; lf = lf->next) {
		if (lf->controller != C_HUMAN) {
			wreck->mazelev[curz].mondifficulty += (getrdifficulty(lf->race));
		}
	}
	// maze layout & objects
	for (y = 0; y < MAZEH; y++) {
		for (x = 0; x < MAZEW; x++) {
			switch (numexits(x,y,curz)) {
				case 2: // corner
					wreck->mazelev[curz].mapdifficulty += 0.5;
					break;
				case 1: // dead end
					wreck->mazelev[curz].mapdifficulty += 1;
					break;
			}

			if (containerhasobject(&wreck->mazelev[curz].maze[y*MAZEW+x].floorobs, O_SPAWNPIT)) {
				wreck->mazelev[curz].mondifficulty += DF_SPAWNPIT;
			}
		}
	}

	// fix exithp
	for (y = 0; y < MAZEH; y++) {
		for (x = 0; x < MAZEW; x++) {
			int d;
			for (d = D_NORTH ; d <= D_WEST; d++) {
				int extype = getexit(x,y,curz,d);
				if (isbreakableexit(getexit(x,y,curz,d))) {
					// using setexit will make sure the hp is right
					setexit(x,y,curz,d,extype);
				}
			}
		}
	}
	*/

	//printf("*** Level difficulty is %0.2f\n", getmazedifficulty(curz));


}

void createroom(map_t *map, int minx, int miny, int w, int h, int roomid) {
	int x,y;
	int poss[MAXOF(MAX_MAPW,MAX_MAPH)];
	int npossible;
	cell_t *cell, *newcell;
	int maxx,maxy;

//printf("trying to create room at (%d,%d) w=%d,h=%d\n", minx, miny, w, h);

	maxx = minx + (w-1);
	maxy = miny + (h-1);

	for (y = miny; y <= maxy; y++) {
		for (x = minx; x <= maxx; x++) {
			cell = getcellat(map, x, y);
			
			// make it a border or room
			if ((y == miny) || (y == maxy) ||
			    (x == minx) || (x == maxx)) {
				setcelltype(cell, CT_ROOMWALL);
			} else {
				setcelltype(cell, CT_ROOM);
			}
			cell->roomid = roomid;
		}
	}


	// for each side, make list of all possible door locations
	// then pick one randomly.
	// BUT if the nearby corridor only has one exit, always
	// place a door.

	// N
	npossible = 0;
	y = miny;
	for (x = minx; x <= maxx; x++) {
		cell = getcellat(map, x, y);
		newcell = getcellindir(cell, D_N);
		if (newcell && !newcell->type->solid) {
			int doorcount;

			doorcount = countadjcellsoftype(cell, CT_DOOROPEN) +
					countadjcellsoftype(cell, CT_DOORCLOSED);
		
			if (doorcount == 0) {
				if ((countcellexits(newcell) == 1) && 
				    (iswallindir(newcell,D_E)) && 
				    (iswallindir(newcell,D_W))) { // always add door
					makedoor(cell);
				} else {
					poss[npossible] = x;
					npossible++;
				}
			}
		}
	}

	if (npossible > 0) {
		int sel = rand() % npossible;
		//printf("adding N door at %d\n",poss[sel]);
		cell = getcellat(map, poss[sel], y);
		makedoor(cell);
	}


	// S
	npossible = 0;
	y = maxy;
	for (x = minx; x <= maxx; x++) {
		cell = getcellat(map, x, y);
		newcell = getcellindir(cell, D_S);
		if (newcell && !newcell->type->solid) {
			int doorcount;

			doorcount = countadjcellsoftype(cell, CT_DOOROPEN) +
					countadjcellsoftype(cell, CT_DOORCLOSED);
		
			if (doorcount == 0) {
				if ((countcellexits(newcell) == 1) && 
				    (iswallindir(newcell,D_E)) && 
				    (iswallindir(newcell,D_W))) { // always add door
					makedoor(cell);
				} else {
					poss[npossible] = x;
					npossible++;
				}
			}
		}
	}

	if (npossible > 0) {
		int sel = rand() % npossible;
		//printf("adding S door at %d\n",poss[sel]);
		cell = getcellat(map, poss[sel], y);
		makedoor(cell);
	}


	// W
	npossible = 0;
	x = minx;
	for (y = miny; y <= maxy; y++) {
		cell = getcellat(map, x, y);
		newcell = getcellindir(cell, D_W);
		if (newcell && !newcell->type->solid) {
			int doorcount;
			doorcount = countadjcellsoftype(cell, CT_DOOROPEN) +
					countadjcellsoftype(cell, CT_DOORCLOSED);
			if (doorcount == 0) {
				if ((countcellexits(newcell) == 1) && 
				    (iswallindir(newcell,D_N)) && 
				    (iswallindir(newcell,D_S))) { // always add door
					makedoor(cell);
				} else {
					poss[npossible] = y;
					npossible++;
				}
			}
		}
	}

	if (npossible > 0) {
		int sel = rand() % npossible;
		//printf("adding W door at %d\n",poss[sel]);
		cell = getcellat(map, x, poss[sel]);
		makedoor(cell);
	}


	// E
	npossible = 0;
	x = maxx;
	for (y = miny; y <= maxy; y++) {
		cell = getcellat(map, x, y);
		newcell = getcellindir(cell, D_E);
		if (newcell && !newcell->type->solid) {
			int doorcount;
			doorcount = countadjcellsoftype(cell, CT_DOOROPEN) +
					countadjcellsoftype(cell, CT_DOORCLOSED);
			if (doorcount == 0) {
				if ((countcellexits(newcell) == 1) && 
				    (iswallindir(newcell,D_N)) && 
				    (iswallindir(newcell,D_S))) { // always add door
					makedoor(cell);
				} else {
					poss[npossible] = y;
					npossible++;
				}
			}
		}
	}

	if (npossible > 0) {
		int sel = rand() % npossible;
		//printf("adding E door at %d\n",poss[sel]);
		cell = getcellat(map, x, poss[sel]);
		makedoor(cell);
	}

}

int dirtox(int dt, int dir) {
	if (dt == DT_ORTH) {
		switch (dir) {
			case D_E:
				return 1;
			case D_W:
				return -1;
			default: 
				return 0;
		}
	} else if (dt == DT_COMPASS) {
		switch (dir) {
			case DC_NE:
			case DC_E:
			case DC_SE:
				return 1;
			case DC_NW:
			case DC_W:
			case DC_SW:
				return -1;
			default: 
				return 0;
		}
	}
	return 0;
}

int dirtoy(int dt, int dir) {
	if (dt == DT_ORTH) {
		switch (dir) {
			case D_S:
				return 1;
			case D_N:
				return -1;
			default: 
				return 0;
		}
	} else if (dt == DT_COMPASS) {
		switch (dir) {
			case DC_SW:
			case DC_S:
			case DC_SE:
				return 1;
			case DC_NE:
			case DC_N:
			case DC_NW:
				return -1;
			default: 
				return 0;
		}
	}
}


void dumpmap(map_t *map) {
	int x,y;
	cell_t *cell;
printf("dump of map '%s' (%d x %d):\n",map->name, map->w, map->h);
	for (y = 0; y < map->h; y++) {
		for (x = 0; x < map->w; x++) {
			cell = getcellat(map, x, y);
			printf("%c",cell->type->glyph);
		}
		printf("\n");
	}
}

map_t *findmap(int mid) {
	map_t *m;
	for (m = firstmap ; m ; m = m->next) {
		if (m->id == mid) return m;
	}
	return NULL;
}

void forgetcells(map_t *map, int amt) {
	int amtleft;
	//int totcells;
	int i;
	cell_t *poss[MAX_MAPW*MAX_MAPH];
	cell_t *c;
	int nposs = 0;
	// how many cells to forget?
	//totcells = (map->w * map->h);
	//amtleft = (int) (((float) pct / 100.0) * (float)totcells);
	amtleft = amt;

	// get a list of all known cells
	for (i = 0; i < (map->w*map->h); i++){
		c = map->cell[i];
		if (c && c->known && !haslos(player, c)) {
			poss[nposs] = c;
			nposs++;
		}
		
	}

	if (amtleft > nposs) amtleft = nposs;

	// forget cells...
	for (i = 0; i < amtleft; i++) {
		int n;
		int sel;
		sel = rnd(0,nposs-1);
		poss[sel]->known = B_FALSE;
		// shuffle down
		for (n = i; n < (amtleft-1); n++) {
			poss[n] = poss[n+1];
		}
		nposs--;
	}
}

cell_t *getcellindir(cell_t *cell, int dir) {
	cell_t *newcell;
	int newx,newy;
	int dt;
	switch (dir) {
		case D_N:
		case D_S:
		case D_E:
		case D_W:
			dt = DT_ORTH;
			break;
		case DC_N:
		case DC_E:
		case DC_S:
		case DC_W:
		case DC_NE:
		case DC_SE:
		case DC_SW:
		case DC_NW:
			dt = DT_COMPASS;
			break;
	}
	newx = cell->x + dirtox(dt, dir);
	newy = cell->y + dirtoy(dt, dir);
	newcell = getcellat(cell->map, newx,newy);

	return newcell;
}

// select a new direction (random chance of turnung)
int getnewdigdir(cell_t *cell, int lastdir, int turnpct, int *moved) {
	int foundvaliddir = B_FALSE;
	int dir;
	int tried[4], numtries;
	int i;
	int turned = B_FALSE;
	cell_t *newcell;
	int db = B_FALSE;
	char err[BUFLEN];

	// haven't tried any dirs yet
	numtries = 0;
	for (i = 0; i < MAXDIR_ORTH; i++) {
		tried[i] = B_FALSE;
	}

	while (!foundvaliddir) { // keep going until we get a valid direction
		int newx,newy;

		if (numtries >= MAXDIR_ORTH) { // no valid dirs 
			return D_NONE; // (pick a new random spot and refresh tried dirs and current dir) 
		}

		if (lastdir == D_UNKNOWN) {
			// just pick a random dir
			dir = rnd(0, MAXDIR_ORTH-1);
			turned = B_TRUE;
		} else {
			// chance of changing dir
			if (rnd(1,100) <= turnpct) {
				dir = rnd(0, MAXDIR_ORTH-1);
				turned = B_TRUE;
			} else {
				dir = lastdir;
			}
		}

		// now validate the direction
		if (db) printf("--- Trying %s...\n",getdirname(dir));
		if (tried[dir] == B_TRUE) { // already found this dir to be invalid
			lastdir = D_UNKNOWN;
			if (db) printf("--- Already know %s is invalid.\n",getdirname(dir));
		} else {
			// check 1 cell ahead
			newcell = getcellindir(cell, dir);
			if (isnewcellok(newcell, err)) {
				cell_t *newcell1, *newcell2;
				// check 2 cells ahead and sidewars
				newcell = getcellindir(newcell, dir);
				if (newcell) {
					switch (dir) {
						case D_N:
						case D_S:
							newcell1 = getcellindir(newcell,D_E);
							newcell2 = getcellindir(newcell,D_W);
							break;
						case D_E:
						case D_W:
							newcell1 = getcellindir(newcell,D_N);
							newcell2 = getcellindir(newcell,D_S);
							break;
					}
				} else {
					newcell1 = NULL;
					newcell2 = NULL;
				}

				if (!isnewcellok(newcell, err)) {
					if (db) printf("--- %s %s!\n",getdirname(dir), err);
					tried[dir] = B_TRUE;
					lastdir = D_UNKNOWN;
					numtries++;
				} else if (!isnewcellok(newcell1, err)) {
					if (db) printf("--- %s %s!\n",getdirname(dir), err);
					tried[dir] = B_TRUE;
					lastdir = D_UNKNOWN;
					numtries++;
				} else if (!isnewcellok(newcell2, err)) {
					if (db) printf("--- %s %s!\n",getdirname(dir), err);
					tried[dir] = B_TRUE;
					lastdir = D_UNKNOWN;
					numtries++;
				} else { // ok
					if (db) printf("--- %s %s!\n",getdirname(dir), err);
					foundvaliddir = B_TRUE;
				}
			} else {
				if (db) printf("--- %s %s!\n",getdirname(dir), err);
				tried[dir] = B_TRUE;
				lastdir = D_UNKNOWN;
				numtries++;
			} 
		}
	}
	//newcell = getcellindir(cell, dir);
	//printf("getrandomdigdir() - on cell %d,%d, returning dir %d (-> %d,%d)\n",
	//		cell->x, cell->y, dir, newcell->x, newcell->y);
	if (turned) *moved = 0;
	return dir;
}

// chance of each empty cell in a map has of getting an object
int getobchance(int habitat) {
	switch (habitat) {
		case H_DUNGEON:
			return 3;
	}
	// default of no objects
	return 0;
}

cell_t *getrandomcell(map_t *map) {
	int x,y;
	cell_t *cell;
	x = (rand() % map->w);
	y = (rand() % map->h);
	cell = getcellat(map, x, y);
	assert(cell);
	return cell;
}

cell_t *getrandomcelloftype(map_t *map, int id) {
	cell_t *cell;
	cell = getrandomcell(map);
	while (cell->type->id != id) {
		cell = getrandomcell(map);
	}
	return cell;
}


int getrandomdir(int dirtype) {
	if (dirtype == DT_ORTH) {
		return rnd(D_N, D_W);
	} else { // ie. DT_COMPASS
		return rnd(DC_N, DC_NW);
	}
	
}

cell_t *getrandomroomcell(map_t *map, int roomid) {
        int npossible = 0;
        int selidx;
        int x,y;
	cell_t *c, **poss;

	poss = malloc((map->w*map->h) * sizeof(cell_t));

	npossible = 0;
        for (y = 0; y < map->h; y++) {
                for (x = 0; x < map->w; x++) {
			c = getcellat(map, x, y);	
			// is this cell in the correct room and not a wall?
			if (c && !c->type->solid && (c->roomid == roomid)) {
				poss[npossible] = c;
				npossible++;
                        }
                }
        }
        if (npossible <= 0) {
		return NULL;
        }

        selidx = rnd(0, npossible-1);
	c = poss[selidx];
	free(poss);
	return c;
}

int isloopdirok(cell_t *cell, int dir) {
	int dirok = B_FALSE;
	cell_t *newcell;
	// is there a corridor in this direction?
	newcell = getcellindir(cell, dir);
	while (newcell) {
		// got a corridor?
		if (!newcell->type->solid) {
			dirok = B_TRUE;
			break;
		}
		// keep going
		newcell = getcellindir(newcell, dir);
	}

	// we've either gone off the map or
	// hit a corridor
	return dirok;
}

int isnewcellok(cell_t *cell, char *err) {
	if ( !cell) { // can't go that way
		if (err) sprintf(err,"goes off the map.");
		return B_FALSE;
	} else if ( !cell->type->solid) { // already an empty space there
		if (err) sprintf(err,"goes to an empty space (%d,%d)",cell->x,cell->y);
		return B_FALSE;
	} 

	// ok!
	if (err) sprintf(err, "OK!");
	return B_TRUE;
}

int isonmap(map_t *map, int x, int y) {
	if ((x < 0) || (y < 0)) {
		return B_FALSE;
	}
	if ((x >= map->w) || (y >= map->h)) {
		return B_FALSE;
	}

	return B_TRUE;
}

int iswallindir(cell_t *cell, int dir) {
	cell_t *newcell;
	newcell = getcellindir(cell, dir);
	if (!newcell) {
		return B_TRUE;
	}

	if (newcell->type->solid) {
		return B_TRUE;
	}

	return B_FALSE;
}

void makedoor(cell_t *cell) {
	setcelltype(cell, CT_DOORCLOSED);
}

void setcelltype(cell_t *cell, int id) {
	int i;

	assert(cell);
	cell->type = findcelltype(id);
	assert(cell->type);
	cell->roomid = 0;
}


void updateknowncells(void) {
	int x,y;
	map_t *map;

	map = player->cell->map;

	for (y = viewy; y < viewy + viewh; y++) {
		for (x = viewx; x < viewx + vieww; x++) {
			cell_t *cell;
			cell = getcellat(map, x, y);
			if (cell && !cell->known && haslos(player, cell)) {
				cell->known = B_TRUE;
			}
		}
	}
}