MapperFunctionBase.h

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//************************************************************************
//                                                                      *
//           Copyright (C)  2004                                        *
//     University Corporation for Atmospheric Research                  *
//           All Rights Reserved                                        *
//                                                                      *
//************************************************************************/
//                  
//  File:       MapperFunctionBase.h
//
//  Author:     Alan Norton
//          National Center for Atmospheric Research
//          PO 3000, Boulder, Colorado
//
//  Date:       August 2005
//
//  Description:    Defines the MapperFunctionBase class  
//      This is the mathematical definition of a function
//      that can be used to map data to either colors or opacities
//      Subclasses can either implement color or transparency 
//      mapping (or both)

#ifndef MAPPERFUNCTIONBASE_H
#define MAPPERFUNCTIONBASE_H
#define MAXCONTROLPOINTS 50
#include <iostream>
#include <vapor/ExpatParseMgr.h>
#include <vapor/OpacityMapBase.h>
#include <vapor/ColorMapBase.h>
#include <vapor/tfinterpolator.h>
#include <vapor/ParamsBase.h>

namespace VAPoR {
class XmlNode;
class ParamNode;
class PARAMS_API MapperFunctionBase : public ParamsBase 
{

public:
    MapperFunctionBase(const string& name);
    MapperFunctionBase(int nBits, const string& name);
    MapperFunctionBase(const MapperFunctionBase &mapper);
    
    virtual ~MapperFunctionBase();

    //
    // Function values
    //
    float opacityValue(float point);
    void  hsvValue(float point, float* h, float* sat, float* val);

    void setOpaque();
    bool isOpaque();

    //
    // Build a lookup table[numEntries][4]
    // (Caller must pass in an empty array)
    //
    void makeLut(float* clut);

    //
    // Data Bounds
    //
    

    void setMinMapValue(float val) { minMapBound = val; }
    void setMaxMapValue(float val) { maxMapBound = val; }
    float getMinMapValue()  { return minMapBound; }
    float getMaxMapValue()  { return maxMapBound; }

    //
    // Variables
    //
   
    int getColorVarNum() { return colorVarNum; }
    int getOpacVarNum() { return opacVarNum; }
   
    virtual void setVarNum(int var)     { colorVarNum = var; opacVarNum = var;}
    virtual void setColorVarNum(int var){ colorVarNum = var; }
    virtual void setOpacVarNum(int var) { opacVarNum = var; }

    //
    // Opacity Maps
    //
    virtual OpacityMapBase* createOpacityMap(
        OpacityMapBase::Type type=OpacityMapBase::CONTROL_POINT
    );
    virtual OpacityMapBase* getOpacityMap(int index) const;
    void        deleteOpacityMap(OpacityMapBase *omap);
    int         getNumOpacityMaps() const { return (int)_opacityMaps.size(); }

    //
    // Opacity scale factor (scales all opacity maps)
    //
    void setOpacityScaleFactor(float val) { opacityScaleFactor = val; }
    float getOpacityScaleFactor()         { return opacityScaleFactor; }

    //
    // Opacity composition
    //
    enum CompositionType
    {
      ADDITION = 0,
      MULTIPLICATION = 1
    };

    void setOpacityComposition(CompositionType t) { _compType = t; }
    CompositionType getOpacityComposition() { return _compType; }

    //
    // Colormap
    //
    virtual ColorMapBase*   getColormap() const;

    //
    // Color conversion 
    //
    static void hsvToRgb(float* hsv, float* rgb);
    static void rgbToHsv(float* rgb, float* hsv);
    
    //
    // Map a point to the specified range, and quantize it.
    //
    static int mapPosition(float x, float minValue, float maxValue, int hSize);

    int getNumEntries()         { return numEntries; }
    void setNumEntries(int val) { numEntries = val; }

    //
    // Map and quantize a real value to the corresponding table index
    // i.e., quantize to current Mapper function domain
    //
    int mapFloatToColorIndex(float point) 
    {
        
      int indx = mapPosition(point, 
                             getMinMapValue(), 
                             getMaxMapValue(), numEntries-1);
      if (indx < 0) indx = 0;
      if (indx > numEntries-1) indx = numEntries-1;
      return indx;
    }

    float mapColorIndexToFloat(int indx)
    {
      return (float)(getMinMapValue() + 
                     ((float)indx)*(float)(getMaxMapValue()-
                                           getMinMapValue())/
                     (float)(numEntries-1));
    }

    int mapFloatToOpacIndex(float point) 
    {
      int indx = mapPosition(point, 
                             getMinMapValue(), 
                             getMaxMapValue(), numEntries-1);
      if (indx < 0) indx = 0;
      if (indx > numEntries-1) indx = numEntries-1;
      return indx;
    }

    float mapOpacIndexToFloat(int indx)
    {
      return (float)(getMinMapValue() + 
                     ((float)indx)*(float)(getMaxMapValue()-
                                           getMinMapValue())/
                     (float)(numEntries-1));
    }
    
    //
    // Methods to save and restore Mapper functions.
    // The gui opens the FILEs that are then read/written
    // Failure results in false/null pointer
    //
    // These methods are the same as the transfer function methods,
    // except for specifying separate color and opacity bounds,
    // and not having a name attribute
    //
    
    virtual ParamNode* buildNode(); 

    virtual bool elementStartHandler(ExpatParseMgr*, int depth, 
                                     std::string&, const char **);

    virtual bool elementEndHandler(ExpatParseMgr*, int, std::string&);
   
    std::string getName() { return mapperName; }

    // Mapper function tag is public, visible to flowparams
    static const string _mapperFunctionTag;
    TFInterpolator::type colorInterpType() {
        if (_colormap) return _colormap->interpType();
        return TFInterpolator::linear;
    }
    void setColorInterpType(TFInterpolator::type t){
        if (_colormap) _colormap->interpType(t);
    }

protected:

    
    //
    // Set to starting values
    //
    virtual void init();  
        
        
protected:

    vector<OpacityMapBase*>  _opacityMaps;
    CompositionType      _compType;

    ColorMapBase            *_colormap;
    //
    // XML tags
    //
    static const string _leftColorBoundAttr;
    static const string _rightColorBoundAttr;
    static const string _leftOpacityBoundAttr;
    static const string _rightOpacityBoundAttr;
    static const string _opacityCompositionAttr;
    //Several attributes became tags after version 1.5:
    static const string _leftColorBoundTag;
    static const string _rightColorBoundTag;
    static const string _leftOpacityBoundTag;
    static const string _rightOpacityBoundTag;
    static const string _opacityCompositionTag;
    static const string _hsvAttr;
    static const string _positionAttr;
    static const string _opacityAttr;
    static const string _opacityControlPointTag;
    static const string _colorControlPointTag;
    // Additional attributes not yet supported:
    
    static const string _rgbAttr;
    
    //
    // Mapping bounds
    //
    float minMapBound, maxMapBound;

    //
    // Parent params
    //
#ifdef  DEAD
    RenderParams* myParams;
#endif
    
    //
    // Size of lookup table.  Always 1<<8 currently!
    //
    int numEntries;

    //
    // Mapper function name, if it's named.
    //
    string mapperName;

    //
    // Corresponding var nums
    //
    int colorVarNum;
    int opacVarNum; 

    //
    // Opacity scale factor
    //
    float opacityScaleFactor;
};
};
#endif //MAPPERFUNCTIONBASE_H