TAPsOpenGLCtrlTransferFn.hpp

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/******************************************************************************
TAPsOpenGLCtrlTransferFn.hpp

Transfer Fn Control via OpenGL

SUKITTI PUNAK   (05/02/2007)
UPDATE          (05/09/2007)
******************************************************************************/
#ifndef TAPs_OPENGL_CONTROL_TRANSFER_FN_HPP
#define TAPs_OPENGL_CONTROL_TRANSFER_FN_HPP

// For DEBUGING
#ifdef TAPs_DEBUG_MODE
#endif

#include "TAPsOpenGLCtrl.hpp"
#include "TAPsOpenGLCtrlButton.hpp"

BEGIN_NAMESPACE_TAPs__OpenGL
//=============================================================================
class OpenGLCtrlTransferFn : public /*virtual*/ OpenGLCtrl {
//-----------------------------------------------------------------------------
public:
    //-------------------------------------------------------------------------
    // Constructor and Destructor
    OpenGLCtrlTransferFn ();
    virtual ~OpenGLCtrlTransferFn ();
    //---------------------------------------------------------------
    // Get/Set Function(s)
    //-------------------------------------------
    virtual void Default ();
    virtual void SetStartPos ( int x, int y );
    //-------------------------------------------
    OpenGLCtrlButton & GetRedButton ()      { return m_ButtonRed; }
    OpenGLCtrlButton & GetGreenButton ()    { return m_ButtonGreen; }
    OpenGLCtrlButton & GetBlueButton ()     { return m_ButtonBlue; }
    OpenGLCtrlButton & GetAlphaButton ()    { return m_ButtonAlpha; }
    //-------------------------------------------
    // Inherited from class OpenGLCtrl.
    virtual void SetOpacity( float alpha );
    virtual bool IsInside ( int x, int y );
    virtual bool IsInsidePlusBorder ( int x, int y );
//protected:
//  virtual void SetSize ( int width, int height ) {}
//public:
    //-------------------------------------------
    void SetLUTToRampFn ();
    void SetLUTToRandomFn ();
    //---------------------------------------------------------------
//  virtual bool IsInside ( int x, int y )
//  {
//      return 
//           m_xyLowerLeftPt[0] <= x && x <= m_xyLowerLeftPt[0]+m_DrawSizeXY[0]
//        && m_xyLowerLeftPt[1]-m_BorderSize <= y && y <= m_xyLowerLeftPt[1]+m_DrawSizeXY[1]+m_BorderSize;
//  }
    //---------------------------------------------------------------
    // Operation(s)
    bool SetClickXY ( int x, int y );
    bool ChangeLUTValues ( int x, int y );
    template <typename T>
    void LoadDataFrom ( T data[256*4], bool isDataNormalized );
    template <typename T>
    void LoadFreqsToHistogram ( T freqs[256] );
    bool SetLUTValuesToRamp ();
    bool SetLUTValuesToRandom ();
    void GetHistogramColor ( float & r, float & g, float & b, float & a ) const;
    void SetHistogramColor ( float r, float g, float b, float a );
    //---------------------------------------------------------------
    virtual void Draw ();       // start at xy-coordinates
    //---------------------------------------------------------------
    bool CopyTo1DTexture    ( GLuint to1DTex,   bool isDataNormalized ) const;
    bool CopyFrom1DTexture  ( GLuint from1DTex, bool isDataNormalized );
    //---------------------------------------------------------------
    // For DEBUGGING
#ifdef TAPs_DEBUG_MODE
    void PrintTransferFnValues_0_1 () {
        std::cout << "Transfer Fn Values [0-1]:\n";
        std::cout << "-------------------------\n";
        for ( int i = 0; i < 256; ++i ) {
            std::cout << i << ": "
                    << (float)m_RGBA[i][0] / 255.0f << " "
                    << (float)m_RGBA[i][1] / 255.0f << " "
                    << (float)m_RGBA[i][2] / 255.0f << " "
                    << (float)m_RGBA[i][3] / 255.0f << "\n";
        }
        std::cout << "-------------------------\n";
    }
    void PrintTransferFnValues_0_255 () {
        std::cout << "Transfer Fn Values [0-255]:\n";
        std::cout << "---------------------------\n";
        for ( int i = 0; i < 256; ++i ) {
            std::cout << i << ": "
                    << (float)m_RGBA[i][0] << " "
                    << (float)m_RGBA[i][1] << " "
                    << (float)m_RGBA[i][2] << " "
                    << (float)m_RGBA[i][3] << "\n";
        }
        std::cout << "---------------------------\n";
    }
#endif
    //---------------------------------------------------------------
//-----------------------------------------------------------------------------
protected:
    //---------------------------------------------------------------
    void DrawBackgroundScale ();
    void DrawIntensities ();
    void DrawColors ();
    void DrawHistogram ();
    //---------------------------------------------------------------
    void SetDefaultLUT ();
    void SetButtons ();
    //---------------------------------------------------------------
    void UpdateRGBA ();
    //-------------------------------------------------------------------------
    // Data Member(s)
    //---------------------------------------------------------------
    OpenGLCtrlButton    m_ButtonRed;
    OpenGLCtrlButton    m_ButtonGreen;
    OpenGLCtrlButton    m_ButtonBlue;
    OpenGLCtrlButton    m_ButtonAlpha;
    //
    GLubyte             m_RGBA[256][4];     // Local RGBA from [0-255]
    //
    class IC_Histogram {
    public:
        GLubyte             normalizedFreqs[256];   // Normalized histogram
        unsigned long int   totalFreqs;             // Total freqs in histogram
        unsigned long int   maxFreq;                // Max freq value in histogram
        GLfloat             histogramColor[4];      // histogram color
    };
    IC_Histogram            m_Histogram;
    //
    GLuint              m_RGBA_1DTexture;   // RGBA in GPU's texture
    //---------------------------------------------------------------
    // For helping changing values interactively
    int m_clickX, m_clickY;
    int m_old_x, m_old_y;
    //---------------------------------------------------------------
    //===============================================================
    //---------------------------------------------------------------
    // Static Data Member(s)
    //-------------------------------------------------------------------------
};  // END CLASS OpenGLCtrlTransferFn

//=============================================================================
END_NAMESPACE_TAPs__OpenGL
//-----------------------------------------------------------------------------
// Include definition if TAPs_USE_EXPORT is not defined
#if !defined( TAPs_USE_EXPORT )
    #include "TAPsOpenGLCtrlTransferFn.cpp"
#endif
//-----------------------------------------------------------------------------
#endif
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