mapgen_topology.h

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/*__            ___                 ***************************************
/   \          /   \          Copyright (c) 1996-2020 Freeciv21 and Freeciv
\_   \        /  __/          contributors. This file is part of Freeciv21.
 _\   \      /  /__     Freeciv21 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 3 of the  License,
       |                              or (at your option) any later version.
     _/     /\                  You should have received  a copy of the GNU
    /o)  (o/\ \_                General Public License along with Freeciv21.
    \_____/ /                     If not, see https://www.gnu.org/licenses/.
      \____/        ********************************************************/
#pragma once
 
// utility
#include "support.h" // bool type
 
/* this is the maximal colatitude at equators returned by
   map_colatitude */
 
#define MAX_COLATITUDE 1000
 
int get_sqsize();
 
/* Size safe Unit of colatitude. 0 is not allowed due to possibility of
 * division by 0 in mapgen.c */
#define L_UNIT                                                              \
  MAX(1, wld.map.server.size *MAX_COLATITUDE / (30 * get_sqsize()))
 
/* define the 3 regions of a Earth like map:
     0           - COLD_LV:        cold region
     COLD_LV     - TREOPICAL_LV:   temperate wet region
     TROPICAL_LV - MAX_COLATITUDE: tropical wet region
   and a dry region, this last one can ovelap others
   DRY_MIN_LEVEL- DRY_MAX_LEVEL */
#define COLD_LEVEL                                                          \
  (MAX(0, MAX_COLATITUDE * (60 * 7 - wld.map.server.temperature * 6) / 700))
#define TROPICAL_LEVEL                                                      \
  (MIN(MAX_COLATITUDE * 9 / 10,                                             \
       MAX_COLATITUDE * (143 * 7 - wld.map.server.temperature * 10) / 700))
#define DRY_MIN_LEVEL                                                       \
  (MAX_COLATITUDE * (7300 - wld.map.server.temperature * 18) / 10000)
#define DRY_MAX_LEVEL                                                       \
  (MAX_COLATITUDE * (7300 + wld.map.server.temperature * 17) / 10000)
 
/* used to create the poles and for separating them.  In a
 * mercator projection map we don't want the poles to be too big. */
extern int ice_base_colatitude;
#define ICE_BASE_LEVEL ice_base_colatitude
 
int map_colatitude(const struct tile *ptile);
bool near_singularity(const struct tile *ptile);
void generator_init_topology(bool autosize);