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00001 
00007 /* Copyright, 2001 Nevrax Ltd.
00008  *
00009  * This file is part of NEVRAX NEL.
00010  * NEVRAX NEL is free software; you can redistribute it and/or modify
00011  * it under the terms of the GNU General Public License as published by
00012  * the Free Software Foundation; either version 2, or (at your option)
00013  * any later version.
00014 
00015  * NEVRAX NEL is distributed in the hope that it will be useful, but
00016  * WITHOUT ANY WARRANTY; without even the implied warranty of
00017  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
00018  * General Public License for more details.
00019 
00020  * You should have received a copy of the GNU General Public License
00021  * along with NEVRAX NEL; see the file COPYING. If not, write to the
00022  * Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
00023  * MA 02111-1307, USA.
00024  */
00025 
00026 #include "std3d.h"
00027 
00028 #include "nel/3d/height_map.h"
00029 
00030 
00031 using namespace NLMISC;
00032 
00033 
00034 namespace NL3D
00035 {
00036 
00037 
00038 // ***************************************************************************
00039 void                    CHeightMap::resize(uint w, uint h)
00040 {
00041         NL3D_MEM_HMAP
00042         _Width= w;
00043         _Height= h;
00044         Heights.resize(w*h);
00045 }
00046 
00047 
00048 // ***************************************************************************
00049 void                    CHeightMap::buildFromBitmap(const NLMISC::CBitmap &bitmap0)
00050 {
00051         NL3D_MEM_HMAP
00052         // copy bitmap.
00053         CBitmap         bitmap= bitmap0;
00054         // convert to luminance.
00055         bitmap.convertToType(CBitmap::Luminance);
00056 
00057         // resize array.
00058         uint    w, h;
00059         w= bitmap.getWidth();
00060         h= bitmap.getHeight();
00061         resize(w,h);
00062 
00063         // get luminance image.
00064         std::vector<uint8>      &array= bitmap.getPixels();
00065         // invert the image in Y.
00066         for(uint y=0;y<h;y++)
00067         {
00068                 for(uint x=0;x<w;x++)
00069                 {
00070                         uint8   v= array[(h-1-y)*w+x];
00071                         Heights[y*w+x]= v;
00072                 }
00073         }
00074 }
00075 
00076 
00077 // ***************************************************************************
00078 float                   CHeightMap::getZ(uint x, uint y) const
00079 {
00080         NL3D_MEM_HMAP
00081         nlassert(x<_Width && y<_Height);
00082         return Heights[y*_Width+x]*MaxZ/255;
00083 }
00084 
00085 
00086 
00087 } // NL3D
height_map.cpp
