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Merged
merged 2 commits into from
Apr 4, 2022
Merged

Improve GetColorTransparent. #10314

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Improve GetColorTransparent.
couet Apr 4, 2022
e3cdc30
Coding conventions
couet Apr 4, 2022
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14 changes: 13 additions & 1 deletion core/base/src/TColor.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -2027,14 +2027,26 @@ Int_t TColor::GetColorDark(Int_t n)

////////////////////////////////////////////////////////////////////////////////
/// Static function: Returns the transparent color number corresponding to n.
/// The transparency level is given by the alpha value a.
/// The transparency level is given by the alpha value a. If a color with the same
/// RGBa values already exists it is returned.

Int_t TColor::GetColorTransparent(Int_t n, Float_t a)
{
if (n < 0) return -1;

TColor *color = gROOT->GetColor(n);
if (color) {
TObjArray *colors = (TObjArray *)gROOT->GetListOfColors();
Int_t ncolors = colors->GetSize();
TColor *col = 0;
for (Int_t i = 0; i < ncolors; i++) {
col = (TColor *)colors->At(i);
if (col) {
if (col->GetRed() == color->GetRed() && col->GetGreen() == color->GetGreen() &&
col->GetBlue() == color->GetBlue() && col->GetAlpha() == a)
return col->GetNumber();
}
}
TColor *colort = new TColor(gROOT->GetListOfColors()->GetLast()+1,
color->GetRed(), color->GetGreen(), color->GetBlue());
colort->SetAlpha(a);
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