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Improve the color palette usage when the palette is not defined #20382

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Merged
merged 4 commits into from
Nov 12, 2025
Merged

Improve the color palette usage when the palette is not defined #20382

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dcb9161
Improve the color palette usage when the palette is not defined
couet Nov 11, 2025
3a11cb4
fix wrong comit
couet Nov 11, 2025
886f984
Make sure dc is at leat 1
couet Nov 11, 2025
3d34f9d
change svg ref file - Improve help
couet Nov 12, 2025
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92 changes: 64 additions & 28 deletions graf2d/graf/src/TPie.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -31,13 +31,69 @@
/** \class TPie
\ingroup BasicGraphics

Draw a Pie Chart,
Define a Pie Chart

\anchor PIE00
#### The possible drawing options are:

| Option | Description |
|--------|-------------------------------------------------------------------|
| "R" | Print the labels along the central "R"adius of slices. |
| "T" | Print the label in a direction "T"angent to circle that describes the TPie. |
| "SC" | Paint the labels with the "S"ame "C"olor as the slices. |
| "3D" | Draw the pie-chart with a pseudo 3D effect. |
| "NOL" | No OutLine: Don't draw the slices' outlines, any property over the slices' line is ignored. |
| ">" | Sort the slices in increasing order. |
| "<" | Sort the slices in decreasing order. |

After the use of > or < options the internal order of the TPieSlices is changed.

\anchor PIE01
#### Labels format
The labels' format can be changed with TPie::SetLabelFormat().

The format string must contain one of these modifiers:

| Modifier | Description |
|----------|-------------------------------------------------------------------|
| "%txt" | to print the text label associated with the slice |
| "%val" | to print the numeric value of the slice |
| "%frac" | to print the relative fraction of this slice |
| "%perc" | to print the % of this slice |

Example:
```
mypie->SetLabelFormat("%txt (%frac)");
```
The numeric format in the label can be changed with TPie::SetFractionFormat.
The numeric format the slices' values can be changed with TPie::SetValueFormat.
The numeric format for the percent value of a slice can be changed with TPie::SetPercentFormat.

If the colors are not specified (`nullptr`) they are automatically
taken from the current color palette as shown in the following example.

Begin_Macro(source)
{
float vals[] = {10., 2., 5., 7.5};
const char* labels[]={"Label 1","Label 2","Label 3","Label4"};

auto C = new TCanvas("C","TPie test",500,500);
auto pie = new TPie("pie", "Pie Title", 4, vals, nullptr, labels);
pie->SetTextFont(42);
pie->SetTextSize(0.04);
pie->SetLabelFormat("#splitline{%txt}{%perc}");
pie->SetLabelsOffset(.02);
pie->SetRadius(.3);
pie->Draw("");
}
End_Macro

More complex example:

Begin_Macro(source)
../../../tutorials/visualisation/graphics/piechart.C
End_Macro

*/

Double_t gX = 0; // Temporary pie X position.
Expand Down Expand Up @@ -739,6 +795,8 @@ void TPie::Init(Int_t np, Double_t ao, Double_t x, Double_t y, Double_t r)

fPieSlices = new TPieSlice*[fNvals];

Int_t ic = 0, dc = TMath::Max(1, gStyle->GetNumberOfColors()/fNvals);

for (Int_t i=0;i<fNvals;++i) {
TString tmplbl = "Slice";
tmplbl += i;
Expand All @@ -747,7 +805,8 @@ void TPie::Init(Int_t np, Double_t ao, Double_t x, Double_t y, Double_t r)
fPieSlices[i]->SetLineColor(1);
fPieSlices[i]->SetLineStyle(1);
fPieSlices[i]->SetLineWidth(1);
fPieSlices[i]->SetFillColor(gStyle->GetColorPalette(i));
fPieSlices[i]->SetFillColor(gStyle->GetColorPalette(ic));
ic = TMath::Min(gStyle->GetNumberOfColors(), ic+dc);
fPieSlices[i]->SetFillStyle(1001);
}

Expand Down Expand Up @@ -782,23 +841,7 @@ TLegend* TPie::MakeLegend(Double_t x1, Double_t y1, Double_t x2, Double_t y2, co

////////////////////////////////////////////////////////////////////////////////
/// Paint a Pie chart in a canvas.
/// The possible option are:
///
/// - "R" Print the labels along the central "R"adius of slices.
/// - "T" Print the label in a direction "T"angent to circle that describes
/// the TPie.
/// - "SC" Paint the labels with the "S"ame "C"olor as the slices.
/// - "3D" Draw the pie-chart with a pseudo 3D effect.
/// - "NOL" No OutLine: Don't draw the slices' outlines, any property over the
/// slices' line is ignored.
/// - ">" Sort the slices in increasing order.
/// - "<" Sort the slices in decreasing order.
///
/// After the use of > or < options the internal order of the TPieSlices
/// is changed.
///
/// Other options changing the labels' format are described in
/// TPie::SetLabelFormat().
/// [See the class description for the possible drawing options](\ref PIE00)

void TPie::Paint(Option_t *option)
{
Expand Down Expand Up @@ -1268,15 +1311,8 @@ void TPie::SetHeight(Double_t val/*=20*/)
}

////////////////////////////////////////////////////////////////////////////////
/// This method is used to customize the label format. The format string
/// must contain one of these modifiers:
///
/// - %txt : to print the text label associated with the slice
/// - %val : to print the numeric value of the slice
/// - %frac : to print the relative fraction of this slice
/// - %perc : to print the % of this slice
///
/// ex. : mypie->SetLabelFormat("%txt (%frac)");
/// This method is used to customize the label format.
/// [See the class description for the possible labels format](\ref PIE01)

void TPie::SetLabelFormat(const char *fmt)
{
Expand Down
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