TQt6PadPainter.h

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// Author:  Sergey Linev, GSI  26/06/2026
 
/*************************************************************************
 * Copyright (C) 1995-2026, 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 ROOT_TQt6PadPainter
#define ROOT_TQt6PadPainter
 
#include "TPadPainterBase.h"
 
class QColor;
class QPen;
class QBrush;
class QPaintWidget;
 
namespace ROOT {
namespace Experimental {
 
class TQt6Canvas;
 
class TQt6PadPainter : public TPadPainterBase {
 
friend class TQt6Canvas;
 
protected:
 
   QPaintWidget *fPaintWidget = nullptr;
 
   static QColor GetQColor(Color_t id);
   QPen GetLinePen();
   QBrush GetFillBrush();
 
public:
 
   TQt6PadPainter(QPaintWidget *widget = nullptr) { fPaintWidget = widget; }
 
   Bool_t   HasTTFonts() const override { return kTRUE; }
 
   Bool_t   IsNative() const override { return kTRUE; }
 
   Bool_t   IsSupportAlpha() const override { return kTRUE; }
 
   void     SetOpacity(Int_t percent) override;
 
   //2. "Off-screen management" part.
   // return non-zero value to let execute painting code
   Int_t    CreateDrawable(UInt_t, UInt_t) override { return 223344; }
   void     ClearDrawable() override {}
   void     CopyDrawable(Int_t, Int_t, Int_t) override {}
   void     DestroyDrawable(Int_t) override {}
   void     SelectDrawable(Int_t) override {}
   void     SetDoubleBuffer(Int_t /* device */, Int_t /* mode */) override {}
 
   //jpg, png, bmp, gif output.
   void     SaveImage(TVirtualPad *, const char *, Int_t) const override;
 
   //TASImage support (noop for a non-gl pad).
   void     DrawPixels(const unsigned char *pixelData, UInt_t width, UInt_t height,
                       Int_t dstX, Int_t dstY, Bool_t enableAlphaBlending) override;
 
   void     DrawLine(Double_t x1, Double_t y1, Double_t x2, Double_t y2) override;
   void     DrawLineNDC(Double_t u1, Double_t v1, Double_t u2, Double_t v2) override;
 
   void     DrawBox(Double_t x1, Double_t y1, Double_t x2, Double_t y2, EBoxMode mode) override;
   //TPad needs double and float versions.
   void     DrawFillArea(Int_t n, const Double_t *x, const Double_t *y) override;
   void     DrawFillArea(Int_t n, const Float_t *x, const Float_t *y) override;
 
   //TPad needs both double and float versions of DrawPolyLine.
   void     DrawPolyLine(Int_t n, const Double_t *x, const Double_t *y) override;
   void     DrawPolyLine(Int_t n, const Float_t *x, const Float_t *y) override;
   void     DrawPolyLineNDC(Int_t n, const Double_t *u, const Double_t *v) override;
 
   //TPad needs both versions.
   void     DrawPolyMarker(Int_t n, const Double_t *x, const Double_t *y) override;
   void     DrawPolyMarker(Int_t n, const Float_t *x, const Float_t *y) override;
 
   void     DrawTTFglyphs(Int_t px, Int_t py, TTFhandle &ttf, [[maybe_unused]] ETextMode mode) override;
 
   void     DrawImage(TImage *img, Int_t x, Int_t y, Int_t flags = 0) override;
 
   ESaveImageResult  SaveAsImage(TVirtualPad *pad, const char *fileName, Int_t type) const override;
   Bool_t   FillImageFromPad(TImage *image, TVirtualPad *pad) const override;
 
private:
   //Let's make this clear:
   TQt6PadPainter(const TQt6PadPainter &rhs) = delete;
   TQt6PadPainter(TQt6PadPainter && rhs) = delete;
   TQt6PadPainter & operator = (const TQt6PadPainter &rhs) = delete;
   TQt6PadPainter & operator = (TQt6PadPainter && rhs) = delete;
 
   ClassDefOverride(TQt6PadPainter, 0) // Pad painter on Qt6 canvas
};
 
} // namespace Experimental
} // namespace ROOT
 
#endif