TransferFunction.h

#pragma once

#ifndef __AFXWIN_H__
    #error 'stdafx.h' muss vor dieser Datei in PCH eingeschlossen werden.
#endif

#include "resource.h"     
#include "Visualize3D.h"
#include "Visualize3DDoc.h"
#include <map>

class CVisualize3DDoc;

class TransferFunction 
{

private:
    
    double ratio;                                   //ratio between max intensity value and 255
    int m_max;                                      //max intensity value
    CVisualize3DDoc* m_doc;
    int startPos, endPos;                           //startValue and endValue for windowing function

    std::map<int, COLORREF> lastMap;                //last specified transfer function (intensity value, color)
    std::map<int, int> lastOpMap;                   //last specified (intensity value, opacity)

    typedef std::pair <int, COLORREF> tf_Pair;
    typedef std::pair <int, int> tf_OpPair;

    unsigned short* tf;                             /*transfer function array, for each value it stores: r,g,b,opacity
                                                    to access color for intensity: r = tf[intensity*4], g = tf[(intensity +1)*4]
                                                    */

private:
    void CalcTF(int oldK, int newK, COLORREF oldV, COLORREF newV, int oldOp, int newOp); //interpolates colors and opacities between to specified points

public:
    TransferFunction(CVisualize3DDoc *doc, int max);
    virtual ~TransferFunction();

    void CreateTransferFunction( std::map<int, COLORREF> m, std::map<int, int> mOp); //creates a transfer function of given input (entries with specified intensity value, color and opacity)
    unsigned short* GetTransferFunction();          //returns tf (transfer function array)
    void ResetTF();                                 //resets transfer function
    void CreateWindowingFunction(int min, int max); //does windowing (resets all values outside of window and calls CreateWindowingTransferFunction
    void CreateWindowingTransferFunction( std::map<int, COLORREF> m, std::map<int, int> mOp); //creates the transfer function within the windowing window
    
};

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