47f23369e8
git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/trunk/supertuxkart@1689 178a84e3-b1eb-0310-8ba1-8eac791a3b58
68 lines
2.4 KiB
C++
68 lines
2.4 KiB
C++
// $Id: terrain_info.cpp 1284 2007-11-08 12:31:54Z hikerstk $
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//
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// SuperTuxKart - a fun racing game with go-kart
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// Copyright (C) 2007 Joerg Henrichs
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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#include <math.h>
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#include "terrain_info.hpp"
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#include "world.hpp"
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#include "constants.hpp"
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TerrainInfo::TerrainInfo(const btVector3 &pos, int frequency)
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{
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m_HoT_frequency = frequency;
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m_HoT_counter = frequency;
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// initialise HoT
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update(pos);
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}
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//-----------------------------------------------------------------------------
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void TerrainInfo::update(const btVector3& pos)
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{
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m_HoT_counter++;
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if(m_HoT_counter>=m_HoT_frequency)
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{
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world->getTrack()->getTerrainInfo(pos, &m_HoT,
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&m_normal, &m_material);
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m_normal.normalize();
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m_HoT_counter = 0;
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}
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} // update
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// -----------------------------------------------------------------------------
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/** Returns the pitch of the terrain depending on the heading
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*/
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float TerrainInfo::getTerrainPitch(float heading) const {
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if(m_HoT==Track::NOHIT) return 0.0f;
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const float X =-sin(heading);
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const float Y = cos(heading);
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// Compute the angle between the normal of the plane and the line to
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// (x,y,0). (x,y,0) is normalised, so are the coordinates of the plane,
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// simplifying the computation of the scalar product.
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float pitch = ( m_normal.getX()*X + m_normal.getY()*Y ); // use ( x,y,0)
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// The actual angle computed above is between the normal and the (x,y,0)
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// line, so to compute the actual angles 90 degrees must be subtracted.
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pitch = acosf(pitch) - NINETY_DEGREE_RAD;
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return pitch;
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} // getTerrainPitch
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// -----------------------------------------------------------------------------
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/* EOF */
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