OSDLBezier.cc

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#include "OSDLBezier.h"

#include "OSDLSurface.h"        // for Surface
#include "OSDLPoint2D.h"        // for Point2D
#include "OSDLVideo.h"          // for VideoModule

#include "Ceylan.h"             // for Ceylan::LogPlug

#include "SDL_gfxPrimitives.h"  // for graphic primitives exported by SDL_gfx


using namespace OSDL::Video ;

using namespace Ceylan::Log ;



// A return code of 0 for SDL_gfx functions means no error, contrary to -1.



bool TwoDimensional::drawBezierCurve( 
    Surface & targetSurface, 
    const listPoint2D & controlPoints,
    Ceylan::Uint16 numberOfSteps, 
    Pixels::ColorElement red, 
    Pixels::ColorElement green, 
    Pixels::ColorElement blue, 
    Pixels::ColorElement alpha ) throw()
{
        
    return drawBezierCurve( targetSurface, controlPoints, numberOfSteps, 
        Pixels::convertRGBAToColorDefinition( red, green, blue, alpha ) ) ;

}   


bool TwoDimensional::drawBezierCurve( 
    Surface & targetSurface, 
    const listPoint2D & controlPoints,
    Ceylan::Uint16 numberOfSteps, 
    Pixels::ColorDefinition colorDef ) throw()
{


    /*
     * If a large number of summits is to be used, dynamic allocation
     * (new/delete) would be better.
     *
     */
    Ceylan::System::Size vertexCount = controlPoints.size() ;
    
    /*
     * Used to be allocated on the stack, but 
     * 'ISO C++ forbids variable-size array'...
     *
     */
    Coordinate * abscissaArray = new Coordinate[ vertexCount ] ;
    Coordinate * ordinateArray = new Coordinate[ vertexCount ] ;
    
    vertexCount = 0 ;
    
    for ( listPoint2D::const_iterator it = controlPoints.begin(); 
        it != controlPoints.end(); it++ )
    {
        abscissaArray[ vertexCount ] = (*it)->getX() ;
        ordinateArray[ vertexCount ] = (*it)->getY() ;
        
        vertexCount++ ;
    }
    
    int res = ::bezierColor( & targetSurface.getSDLSurface(), 
        abscissaArray, ordinateArray, vertexCount, numberOfSteps, 
        Pixels::convertColorDefinitionToRawPixelColor( colorDef ) ) ;
    
    delete [] abscissaArray ;
    delete [] ordinateArray ;
        
    return ( res == 0 ) ;   

}   

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