engine/math/mQuadPatch.cc

//-----------------------------------------------------------------------------
// V12 Engine
// 
// Copyright (c) 2001 GarageGames.Com
// Portions Copyright (c) 2001 by Sierra Online, Inc.
//-----------------------------------------------------------------------------

#include "Math/mQuadPatch.h"


//******************************************************************************
// Quadratic spline patch
//******************************************************************************
QuadPatch::QuadPatch()
{
   setNumReqControlPoints(3);
}

//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
void QuadPatch::calcABC( const Point3F *points )
{
   a = points[2] - points[1];
   b = points[1] - points[0];
   c = points[0];
}


//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
void QuadPatch::submitControlPoints( SplCtrlPts &points )
{
   Parent::submitControlPoints( points );
   calcABC( points.getPoint(0) );
};


//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
void QuadPatch::setControlPoint( Point3F &point, int index )
{
   ( (SplCtrlPts*) getControlPoints() )->setPoint( point, index );
   calcABC( getControlPoint(0) );
}

//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
void QuadPatch::calc( F32 t, Point3F &result )
{
   F32 t2 = t*t;
   result = a*t2 + b*t + c;
}


//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
void QuadPatch::calc( Point3F *points, F32 t, Point3F &result )
{
   calcABC( points );
   calc( t, result );
}