nevrax.org : docs

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
