## File: tiles.h

package info (click to toggle)
exult 0.98rc1-2
 `1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677` ``````/* * tiles.h - Tile coords. * * Copyright (C) 2000-2001 The Exult Team * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Library General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #ifndef INCL_TILES #define INCL_TILES 1 #include "exult_constants.h" /* * A 3D tile coordinate: */ class Tile_coord { static short neighbors; // Neighboring tiles in each dir. public: short tx, ty, tz; // Coords. within world. tz=lift. Tile_coord(int x, int y, int z) : tx(x), ty(y), tz(z) { } Tile_coord(): tx(0),ty(0),tz(0) { } int operator==(Tile_coord t2) { return t2.tx == tx && t2.ty == ty && t2.tz == tz; } int operator!=(Tile_coord t2) { return !(*this == t2); } int distance(Tile_coord t2) // Distance to another tile? { // Handle wrapping round the world. int dy = (t2.ty - ty + c_num_tiles)%c_num_tiles; int dx = (t2.tx - tx + c_num_tiles)%c_num_tiles; if (dy >= c_num_tiles/2)// World-wrapping. dy = c_num_tiles - dy; if (dx >= c_num_tiles/2) dx = c_num_tiles - dx; // Take larger abs. value. return (dy > dx ? dy : dx); } // Get neighbor in given dir (0-7). inline Tile_coord get_neighbor(int dir) { return Tile_coord( (tx + neighbors[2*dir] + c_num_tiles)%c_num_tiles, (ty + neighbors[2*dir + 1] + c_num_tiles)%c_num_tiles, tz); } static bool gte(int t1, int t2) // Ret. t1 >= t2 with wrapping. { int diff = t1 - t2; return diff >= 0 ? (diff < c_num_tiles/2) : diff < -c_num_tiles/2; } // Ret. (to - from) with wrapping. static int delta(int from, int to) { int diff = to - from; return diff >= c_num_tiles/2 ? (diff - c_num_tiles) : (diff <= -c_num_tiles/2 ? (diff + c_num_tiles) : diff); } }; // Add two coords. inline Tile_coord operator+(Tile_coord a, Tile_coord b) { return Tile_coord(a.tx + b.tx, a.ty + b.ty, a.tz + b.tz); } #endif ``````