snowballs2/client/src/physics.cpp

   1 // NeL - MMORPG Framework <http://dev.ryzom.com/projects/nel/>
   2 // Copyright (C) 2010  Winch Gate Property Limited
   3 //
   4 // This program is free software: you can redistribute it and/or modify
   5 // it under the terms of the GNU Affero General Public License as
   6 // published by the Free Software Foundation, either version 3 of the
   7 // License, or (at your option) any later version.
   8 //
   9 // This program is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU Affero General Public License for more details.
  13 //
  14 // You should have received a copy of the GNU Affero General Public License
  15 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 //
  18 // Includes
  19 //
  20
  21 #include <nel/misc/types_nl.h>
  22
  23 #include "physics.h"
  24
  25 //
  26 // Namespaces
  27 //
  28
  29 using namespace std;
  30 using namespace NLMISC;
  31
  32 namespace SBCLIENT {
  33
  34 // -- -- this file exists twice
  35
  36 CVector CTrajectory::eval(NLMISC::TLocalTime t) const
  37 {
  38         if (t < _StartTime) return _StartPosition;
  39
  40         float   ft = (float)(t-_StartTime)/(float)(_StopTime-_StartTime);
  41         ft = min(ft, 1.0f);
  42         CVector res = _EndPosition*ft + _StartPosition*(1.0f-ft);
  43         res.z += 0.3f*_Distance*_Distance/90.0f*(float)sin(Pi*ft);
  44         return res;
  45 }
  46
  47 CVector CTrajectory::evalSpeed(NLMISC::TLocalTime t) const
  48 {
  49         if (t < _StartTime) return _StartPosition;
  50
  51         float   ft = (float)(t-_StartTime)/(float)(_StopTime-_StartTime);
  52         ft = min(ft, 1.0f);
  53         CVector res = (_EndPosition-_StartPosition).normed()*_Speed;
  54         res.z += 0.3f*_Distance*_Distance/90.0f*(float)Pi*(float)cos(Pi*ft);
  55         return res;
  56 }
  57
  58 } /* namespace SBCLIENT */
  59
  60 /* end of file */