____                _       __
    / __ )____  _____   | |     / /___ ___________
   / __  / __ \/ ___/   | | /| / / __ `/ ___/ ___/
  / /_/ / /_/ (__  )    | |/ |/ / /_/ / /  (__  )
 /_____/\____/____/     |__/|__/\__,_/_/  /____/

       A futuristic real-time strategy game.
          This file is part of Bos Wars.

(C) Copyright 2001-2007 by the Bos Wars and Stratagus Project. Distributed under the "GNU General Public License"

---

map_radar.cpp

Go to the documentation of this file.

//     ____                _       __               
//    / __ )____  _____   | |     / /___ ___________
//   / __  / __ \/ ___/   | | /| / / __ `/ ___/ ___/
//  / /_/ / /_/ (__  )    | |/ |/ / /_/ / /  (__  ) 
// /_____/\____/____/     |__/|__/\__,_/_/  /____/  
//                                              
//       A futuristic real-time strategy game.
//          This file is part of Bos Wars.
//
//
//      (c) Copyright 2004-2007 by Russell Smith and Jimmy Salmon.
//
//      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; only version 2 of the License.
//
//      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 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.
//


/*----------------------------------------------------------------------------
--  Includes
----------------------------------------------------------------------------*/

#include "stratagus.h"
#include "player.h"
#include "unittype.h"
#include "unit.h"
#include "map.h"

/*----------------------------------------------------------------------------
--  Functions
----------------------------------------------------------------------------*/

bool UnitVisibleOnRadar(const CPlayer *pradar, const CUnit *punit)
{
    for (int i = punit->X; i < punit->X + punit->Type->TileWidth; ++i) {
        for (int j = punit->Y; j < punit->Y + punit->Type->TileHeight; ++j) {
            if (IsTileRadarVisible(pradar, punit->Player, i, j) != 0) {
                return true;
            }
        }
    }

    // Can't exit till the end, as we might be be able to see a different tile
    return false;
}

unsigned char IsTileRadarVisible(const CPlayer *pradar, const CPlayer *punit, int x, int y)
{
    unsigned char radarvision;
    unsigned char *radar;
    unsigned char *jamming;

    jamming = Map.Field(x, y)->RadarJammer;
    if (jamming[punit->Index]) {
        return 0;
    }

    radar = Map.Field(x, y)->Radar;
    radarvision = radar[pradar->Index];

    if (!pradar->SharedVision) {
        return radarvision;
    }

    // Check jamming first, if we are jammed, exit
    for (int i = 0; i < PlayerMax; ++i) {
        if (jamming[i] > 0 && (punit->SharedVision & (1 << i)) &&
                (Players[i].SharedVision & (1 << punit->Index))) {
            // We are jammed, return nothing
            return 0;
        }
        if (pradar->SharedVision & (1 << i) &&
                (Players[i].SharedVision & (1 << pradar->Index))) {
            radarvision |= radar[i];
        }
    }

    // Can't exit until the end, as we might be jammed
    return radarvision;
}

void MapMarkTileRadar(const CPlayer *player, int x, int y)
{
    Assert(0 <= x && x < Map.Info.MapWidth);
    Assert(0 <= y && y < Map.Info.MapHeight);
    Assert(Map.Field(x, y)->Radar[player->Index] != 255);

    Map.Field(x, y)->Radar[player->Index]++;
}

void MapUnmarkTileRadar(const CPlayer *player, int x, int y)
{
    unsigned char *v;

    Assert(0 <= x && x < Map.Info.MapWidth);
    Assert(0 <= y && y < Map.Info.MapHeight);

    // Reduce radar coverage if it exists.
    v = &Map.Field(x, y)->Radar[player->Index];
    if (*v) {
        --*v;
    }
}

void MapMarkTileRadarJammer(const CPlayer *player, int x, int y)
{
    Assert(0 <= x && x < Map.Info.MapWidth);
    Assert(0 <= y && y < Map.Info.MapHeight);
    Assert(Map.Field(x, y)->RadarJammer[player->Index] != 255);

    Map.Field(x, y)->RadarJammer[player->Index]++;
}

void MapUnmarkTileRadarJammer(const CPlayer *player, int x, int y)
{
    unsigned char *v;

    Assert(0 <= x && x < Map.Info.MapWidth);
    Assert(0 <= y && y < Map.Info.MapHeight);

    // Reduce radar coverage if it exists.
    v = &Map.Field(x, y)->RadarJammer[player->Index];
    if (*v) {
        --*v;
    }
}

---