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cParticle.cpp

00001 /************************************************************************
00002 Nova-2 Library (libN2L, or simply n2l) Game development C++ Library
00003 Copyright (C) 2003  Aaron Cameron
00004 
00005 This library is free software; you can redistribute it and/or
00006 modify it under the terms of the GNU Lesser General Public
00007 License as published by the Free Software Foundation; either
00008 version 2.1 of the License, or (at your option) any later version.
00009 
00010 This library is distributed in the hope that it will be useful,
00011 but WITHOUT ANY WARRANTY; without even the implied warranty of
00012 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013 Lesser General Public License for more details.
00014 
00015 You should have received a copy of the GNU Lesser General Public
00016 License along with this library; if not, write to the Free Software
00017 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
00018 
00019 A copy of the GNU Lesser General Public License has been provided with
00020 this library in the file 'COPYING'.
00021 
00022 Contact information for the author of this library has been provided
00023 with this library in the file 'AUTHOR'.
00024 ************************************************************************/
00025 #include "particles/cParticle.h"
00026 
00027 #include <GL/gl.h>
00028 
00029 #include <iostream>
00030 using namespace std;
00031 
00032 namespace n2l
00033 {
00034     const tFloat cParticle::DeathSizeThreashold =   0.01;
00035 
00036     /* ************************************************************ */
00037     cParticle::cParticle() :
00038         mPos( 0.0f,0.0f,0.0f ),
00039         mVelocity( 0.0f,0.0f,0.0f ),
00040         mSize( 1.0f,1.0f ),
00041         mGrowth( 0.0f,0.0f ),
00042         mStartColour( 1.0f,1.0f,1.0f,1.0f ),
00043         mEndColour( 0.0f,0.0f,0.0f,1.0f ),
00044         mColour(),
00045         mTimeAlive(0),
00046         mTimeToLive(0),
00047         mTexture(0)
00048     {
00049     }
00050     
00051     /* ************************************************************ */
00052     cParticle::cParticle(   const tVector3f &iPos,
00053                             const tVector3f &iVelocity,
00054                             const tVector2f &iSize,
00055                             const tVector2f &iGrowth,
00056                             const cColour &iStartColour,
00057                             const cColour &iEndColour,
00058                             const tUint iTimeToLive,
00059                             const cAutoPtr<const cGLTexture> &iTexture ) :
00060         mPos( iPos ),
00061         mVelocity( iVelocity ),
00062         mSize( iSize ),
00063         mGrowth( iGrowth ),
00064         mStartColour( iStartColour ),
00065         mEndColour( iEndColour ),
00066         mColour( iStartColour ),
00067         mTimeAlive(0),
00068         mTimeToLive( iTimeToLive ),
00069         mTexture( iTexture )
00070     {
00071     }
00072 
00073     /* ************************************************************ */
00074     const tBool cParticle::alive() const
00075     {
00076         return (mTimeAlive<mTimeToLive &&
00077                 mSize.x()>DeathSizeThreashold && 
00078                 mSize.y()>DeathSizeThreashold);
00079     }
00080         
00081     /* ************************************************************ */
00082     void cParticle::update( const tFloat &iSeconds )
00083     {
00084         mTimeAlive += tUint(iSeconds*1000.0f);
00085 
00086         mPos += (mVelocity*iSeconds);
00087         mSize += (mGrowth*iSeconds);
00088         mBoundRadius = n2lMax(mSize.x(),mSize.y());
00089 
00090         mColour = mEndColour;
00091         mColour -= mStartColour;
00092         mColour *= mTimeAlive/tFloat(mTimeToLive);
00093         mColour += mStartColour;
00094     }
00095         
00096 
00097     /* ************************************************************ */
00098     void cParticle::draw( const tVector3f &iHalfUpV,
00099         const tVector3f &iHalfRightV ) const
00100     {
00101         // Calculate positions
00102         tVector3f up( iHalfUpV );
00103         tVector3f right( iHalfRightV );
00104 
00105         right *= mSize.x();
00106         up *= mSize.y();
00107 
00108         tVector3f left = right;
00109         left *= -1.0f;
00110         
00111         tVector3f down = up;
00112         down *= -1.0f;
00113 
00114         tVector3f topRight(up+right);
00115         tVector3f topLeft(up+left);
00116         tVector3f bottomRight(down+right);
00117         tVector3f bottomLeft(down+left);
00118 
00119         topRight += mPos;
00120         topLeft += mPos;
00121         bottomRight += mPos;
00122         bottomLeft += mPos;
00123 
00124         mColour.glColor4fv();
00125         glBegin( GL_TRIANGLE_STRIP );
00126         glTexCoord2f( 1.0f, 1.0f );
00127         topRight.glVertex3f();
00128         glTexCoord2f( 0.0f, 1.0f );
00129         topLeft.glVertex3f();
00130         glTexCoord2f( 1.0f, 0.0f );
00131         bottomRight.glVertex3f();
00132         glTexCoord2f( 0.0f, 0.0f );
00133         bottomLeft.glVertex3f();
00134         glEnd();
00135     }
00136 
00137     /* ************************************************************ */
00138 
00139     /* ************************************************************ */
00140 
00141     /* ************************************************************ */
00142 
00143 } // namespace
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cParticle.cpp

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