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TCanvas drawing area size #22226

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TCanvas drawing area size #22226

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5 changes: 4 additions & 1 deletion core/base/inc/TStyle.h
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Original file line number Diff line number Diff line change
Expand Up @@ -89,6 +89,7 @@ class TStyle : public TNamed, public TAttLine, public TAttFill, public TAttMarke
Int_t fCanvasDefW; ///< Default canvas width
Int_t fCanvasDefX; ///< Default canvas top X position
Int_t fCanvasDefY; ///< Default canvas top Y position
Bool_t fCanvasSizeIsDrawingArea; ///< If true, TCanvas ctor sizes define the drawing area instead of the window size. Default is false.
Color_t fPadColor; ///< Pad color
Width_t fPadBorderSize; ///< Pad border size
Int_t fPadBorderMode; ///< Pad border mode
Expand Down Expand Up @@ -194,6 +195,7 @@ class TStyle : public TNamed, public TAttLine, public TAttFill, public TAttMarke
Int_t GetCanvasDefW() const {return fCanvasDefW;}
Int_t GetCanvasDefX() const {return fCanvasDefX;}
Int_t GetCanvasDefY() const {return fCanvasDefY;}
Bool_t GetCanvasSizeIsDrawingArea() const {return fCanvasSizeIsDrawingArea;}
Int_t GetColorPalette(Int_t i) const;
Int_t GetColorModelPS() const {return fColorModelPS;}
Float_t GetDateX() const {return fDateX;}
Expand Down Expand Up @@ -351,6 +353,7 @@ class TStyle : public TNamed, public TAttLine, public TAttFill, public TAttMarke
void SetCanvasDefW(Int_t w=700) {fCanvasDefW = w;}
void SetCanvasDefX(Int_t topx=10) {fCanvasDefX = topx;}
void SetCanvasDefY(Int_t topy=10) {fCanvasDefY = topy;}
void SetCanvasSizeIsDrawingArea(Int_t da =kFALSE) {fCanvasSizeIsDrawingArea = da;}
void SetLegendBorderSize(Width_t size=4) {fLegendBorderSize = size;}
void SetLegendFillColor(Color_t color=0) {fLegendFillColor = color;}
void SetLegendFillStyle(Style_t style=1001) {fLegendFillStyle = style;}
Expand Down Expand Up @@ -435,7 +438,7 @@ class TStyle : public TNamed, public TAttLine, public TAttFill, public TAttMarke
void SavePrimitive(std::ostream &out, Option_t * = "") override;
void SaveSource(const char *filename, Option_t *option = nullptr);

ClassDefOverride(TStyle, 24); //A collection of all graphics attributes
ClassDefOverride(TStyle, 25); //A collection of all graphics attributes
};


Expand Down
3 changes: 3 additions & 0 deletions core/base/src/TStyle.cxx
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Expand Up @@ -567,6 +567,7 @@ void TStyle::Copy(TObject &obj) const
((TStyle&)obj).fCanvasDefW = fCanvasDefW;
((TStyle&)obj).fCanvasDefX = fCanvasDefX;
((TStyle&)obj).fCanvasDefY = fCanvasDefY;
((TStyle&)obj).fCanvasSizeIsDrawingArea = fCanvasSizeIsDrawingArea;
((TStyle&)obj).fPadColor = fPadColor;
((TStyle&)obj).fPadBorderSize = fPadBorderSize;
((TStyle&)obj).fPadBorderMode = fPadBorderMode;
Expand Down Expand Up @@ -713,6 +714,7 @@ void TStyle::Reset(Option_t *opt)
fCanvasDefW = 700;
fCanvasDefX = 10;
fCanvasDefY = 10;
fCanvasSizeIsDrawingArea = kFALSE;
fPadColor = fCanvasColor;
fPadBorderSize = fCanvasBorderSize;
fPadBorderMode = fCanvasBorderMode;
Expand Down Expand Up @@ -2149,6 +2151,7 @@ void TStyle::SavePrimitive(std::ostream &out, Option_t * /*= ""*/)
out << prefix << "SetCanvasDefW(" << GetCanvasDefW() << ");\n";
out << prefix << "SetCanvasDefX(" << GetCanvasDefX() << ");\n";
out << prefix << "SetCanvasDefY(" << GetCanvasDefY() << ");\n";
out << prefix << "SetCanvasSizeIsDrawingArea(" << GetCanvasSizeIsDrawingArea() << ");\n";
out << prefix << "SetPadColor(" << TColor::SavePrimitiveColor(GetPadColor()) << ");\n";
out << prefix << "SetPadBorderSize(" << GetPadBorderSize() << ");\n";
out << prefix << "SetPadBorderMode(" << GetPadBorderMode() << ");\n";
Expand Down
25 changes: 25 additions & 0 deletions graf2d/gpad/src/TCanvas.cxx
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Expand Up @@ -138,6 +138,27 @@ Following example shows how to proceed.
c->SetWindowSize(500, 500);
}
~~~

\since **ROOT version 6.41/02:**

When SetCanvasSizeIsDrawingArea(kTRUE) is enabled, the width and height passed to the TCanvas
constructor define the size of the drawable area, rather than the full window size.

Enabling this option makes the canvas behave consistently with typical image/output use cases,
where the requested size should match the final rendered content.

Example:
~~~ {.cpp}
{
gStyle->SetCanvasSizeIsDrawingArea(kTRUE);
Double_t w = 600;
Double_t h = 600;
auto c = new TCanvas("c", "c", w, h);
c->SaveAs("c.png");
}
~~~

In this example, the saved PNG will have exactly 600×600 pixels of drawable content.
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*/

////////////////////////////////////////////////////////////////////////////////
Expand Down Expand Up @@ -666,6 +687,10 @@ void TCanvas::Build()
if (TestBit(kShowEditor)) fCanvasImp->ShowEditor(kTRUE);
if (TestBit(kShowToolTips)) fCanvasImp->ShowToolTips(kTRUE);
}
if (gStyle->GetCanvasSizeIsDrawingArea()) {
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SetWindowSize(fWindowWidth + (fWindowWidth - GetWw()),
fWindowHeight + (fWindowHeight - GetWh()));
}
}

////////////////////////////////////////////////////////////////////////////////
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