snowballs2/server/position/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 "physics.h"
  22
  23 //
  24 // Namespaces
  25 //
  26
  27 using namespace std;
  28 using namespace NLMISC;
  29
  30 CVector CTrajectory::eval(NLMISC::TTime t) const
  31 {
  32         float   ft = (float)(t-_StartTime)/(float)(_StopTime-_StartTime);
  33         ft = min(ft, 1.0f);
  34         CVector res = _EndPosition*ft + _StartPosition*(1.0f-ft);
  35         res.z += 0.3f*_Distance*_Distance/90.0f*(float)sin(Pi*ft);
  36         return res;
  37 }
  38
  39 CVector CTrajectory::evalSpeed(NLMISC::TTime t) const
  40 {
  41         float   ft = (float)(t-_StartTime)/(float)(_StopTime-_StartTime);
  42         ft = min(ft, 1.0f);
  43         CVector res = (_EndPosition-_StartPosition).normed()*_Speed;
  44         res.z += 0.3f*_Distance*_Distance/90.0f*(float)Pi*(float)cos(Pi*ft);
  45         return res;
  46 }