src/cave/helper/cavemap.cpp

   1 /*
   2  * Copyright (c) 2007-2013, Czirkos Zoltan http://code.google.com/p/gdash/
   3  *
   4  * Permission to use, copy, modify, and distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #include "config.h"
  18
  19 #include <algorithm>
  20 #include "cave/helper/cavemap.hpp"
  21
  22 void CaveMapBase::perfect_wrap_coords(int w, int h, int &x, int &y) {
  23     y=(y+h)%h;
  24     x=(x+w)%w;
  25 }
  26
  27 void CaveMapBase::lineshift_wrap_coords_only_x(int w, int &x, int &y) {
  28     /* fit x coordinate within range, with correcting y at the same time */
  29     while (x>=w) {
  30         y++;
  31         x-=w;
  32     }
  33     while (x<0) {   /* out of bounds on the left... */
  34         y--;    /* previous row */
  35         x+=w;
  36     }
  37     /* here do not change x to be >=0 and <= h-1 */
  38 }
  39
  40 void CaveMapBase::lineshift_wrap_coords_both(int w, int h, int &x, int &y) {
  41     lineshift_wrap_coords_only_x(w, x, y);
  42     y=(y+h)%h;
  43 }