REveUtil.hxx

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// @(#)root/eve7:$Id$
// Authors: Matevz Tadel & Alja Mrak-Tadel: 2006, 2007
 
/*************************************************************************
 * Copyright (C) 1995-2019, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/
 
#ifndef ROOT7_REveUtil
#define ROOT7_REveUtil
 
#include "REveTypes.hxx"
 
#include "TError.h"
 
#include <map>
#include <set>
#include <exception>
 
class TGeoManager;
 
namespace ROOT {
namespace Experimental {
 
class REveElement;
 
////////////////////////////////////////////////////////////////////////////////
/// REveUtil
/// Standard utility functions for Reve.
////////////////////////////////////////////////////////////////////////////////
 
class REveUtil
{
private:
   static TObjArray *fgDefaultColors;
 
public:
   virtual ~REveUtil() {}
 
   // Macro functions
 
   static Bool_t CheckMacro(const char *mac);
   static void AssertMacro(const char *mac);
   static void Macro(const char *mac);
   static void LoadMacro(const char *mac);
 
   // Color management
 
   static void ColorFromIdx(Color_t ci, UChar_t col[4], Bool_t alpha = kTRUE);
   static void ColorFromIdx(Color_t ci, UChar_t col[4], Char_t transparency);
   static void ColorFromIdx(Float_t f1, Color_t c1, Float_t f2, Color_t c2, UChar_t col[4], Bool_t alpha = kTRUE);
   static Color_t *FindColorVar(TObject *obj, const char *varname);
 
   static void SetColorBrightness(Float_t value, Bool_t full_redraw = kFALSE);
 
   // Math utilities
 
   static Bool_t IsU1IntervalContainedByMinMax(Float_t minM, Float_t maxM, Float_t minQ, Float_t maxQ);
   static Bool_t IsU1IntervalOverlappingByMinMax(Float_t minM, Float_t maxM, Float_t minQ, Float_t maxQ);
 
   static Bool_t IsU1IntervalContainedByMeanDelta(Float_t meanM, Float_t deltaM, Float_t meanQ, Float_t deltaQ);
   static Bool_t IsU1IntervalOverlappingByMeanDelta(Float_t meanM, Float_t deltaM, Float_t meanQ, Float_t deltaQ);
 
   static Float_t GetFraction(Float_t minM, Float_t maxM, Float_t minQ, Float_t maxQ);
};
 
inline Bool_t REveUtil::IsU1IntervalContainedByMeanDelta(Float_t meanM, Float_t deltaM, Float_t meanQ, Float_t deltaQ)
{
   return IsU1IntervalContainedByMinMax(meanM - deltaM, meanM + deltaM, meanQ - deltaQ, meanQ + deltaQ);
}
 
inline Bool_t REveUtil::IsU1IntervalOverlappingByMeanDelta(Float_t meanM, Float_t deltaM, Float_t meanQ, Float_t deltaQ)
{
   return IsU1IntervalContainedByMinMax(meanM - deltaM, meanM + deltaM, meanQ - deltaQ, meanQ + deltaQ);
}
 
 
////////////////////////////////////////////////////////////////////////////////
/// REveGeoManagerHolder
/// Exception-safe global variable holders
////////////////////////////////////////////////////////////////////////////////
 
class REveGeoManagerHolder
{
private:
   TGeoManager *fManager{nullptr};  ///<!  hold manager
   Int_t fNSegments{0};             ///<!  previous settings for num segments
 
public:
   REveGeoManagerHolder(TGeoManager *new_gmgr = nullptr, Int_t n_seg = 0);
   ~REveGeoManagerHolder();
};
 
////////////////////////////////////////////////////////////////////////////////
/// REveRefCnt
/// REveRefCnt base-class (interface)
////////////////////////////////////////////////////////////////////////////////
 
class REveRefCnt
{
   REveRefCnt(const REveRefCnt &) = delete;
   REveRefCnt &operator=(const REveRefCnt &) = delete;
 
protected:
   Int_t fRefCount{0};
 
public:
   REveRefCnt() = default;
   virtual ~REveRefCnt() {}
 
   void IncRefCount() { ++fRefCount; }
   void DecRefCount()
   {
      if (--fRefCount <= 0)
         OnZeroRefCount();
   }
 
   virtual void OnZeroRefCount() = 0;
};
 
////////////////////////////////////////////////////////////////////////////////
/// REveRefBackPtr
/// reference-count with back pointers
////////////////////////////////////////////////////////////////////////////////
 
class REveRefBackPtr : public REveRefCnt
{
   REveRefBackPtr(const REveRefBackPtr &) = delete;
   REveRefBackPtr &operator=(const REveRefBackPtr &) = delete;
 
protected:
   typedef std::map<REveElement *, Int_t> RefMap_t;
 
   RefMap_t fBackRefs;
 
public:
   REveRefBackPtr() = default;
   ~REveRefBackPtr() override;
 
   using REveRefCnt::DecRefCount;
   using REveRefCnt::IncRefCount;
   virtual void IncRefCount(REveElement *re);
   virtual void DecRefCount(REveElement *re);
 
   virtual void StampBackPtrElements(UChar_t stamps);
};
 
} // namespace Experimental
} // namespace ROOT
 
#endif