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greyscale.C
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1
/// \file
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/// \ingroup tutorial_hist
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/// \notebook
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/// Create grey scale of `200 x 200` boxes.
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///
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/// \macro_image
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/// \macro_code
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///
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/// \author Olivier Couet
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void
greyscale()
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{
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TCanvas
*
c
=
new
TCanvas
(
"grey"
,
"Grey Scale"
, 500, 500);
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c
->SetBorderMode(0);
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Int_t
n
= 200;
// tunable parameter
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Float_t
n1 = 1./
n
;
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for
(
int
i = 0; i <
n
; i++) {
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for
(
int
j = 0; j <
n
; j++) {
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TBox
*
b
=
new
TBox
(n1*j, n1*(
n
-1-i), n1*(j+1), n1*(
n
-i));
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Float_t
grey =
Float_t
(i*
n
+j)/(
n
*
n
);
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b
->SetFillColor(
TColor::GetColor
(grey, grey, grey));
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b
->Draw();
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}
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}
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TPad
*
p
=
new
TPad
(
"p"
,
"p"
,0.3, 0.3, 0.7,0.7);
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const
char
*guibackground =
gEnv
->
GetValue
(
"Gui.BackgroundColor"
,
""
);
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p
->SetFillColor(
TColor::GetColor
(guibackground));
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p
->
Draw
();
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p
->cd();
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TText
*t =
new
TText
(0.5, 0.5,
"GUI Background Color"
);
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t->
SetTextAlign
(22);
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t->
SetTextSize
(.09);
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t->
Draw
();
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c
->SetEditable(
kFALSE
);
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}
b
#define b(i)
Definition
RSha256.hxx:100
c
#define c(i)
Definition
RSha256.hxx:101
Int_t
int Int_t
Definition
RtypesCore.h:45
Float_t
float Float_t
Definition
RtypesCore.h:57
kFALSE
constexpr Bool_t kFALSE
Definition
RtypesCore.h:94
gEnv
R__EXTERN TEnv * gEnv
Definition
TEnv.h:170
p
winID h TVirtualViewer3D TVirtualGLPainter p
Definition
TGWin32VirtualGLProxy.cxx:51
TAttText::SetTextAlign
virtual void SetTextAlign(Short_t align=11)
Set the text alignment.
Definition
TAttText.h:42
TAttText::SetTextSize
virtual void SetTextSize(Float_t tsize=1)
Set the text size.
Definition
TAttText.h:47
TBox
Create a Box.
Definition
TBox.h:22
TCanvas
The Canvas class.
Definition
TCanvas.h:23
TColor::GetColor
static Int_t GetColor(const char *hexcolor)
Static method returning color number for color specified by hex color string of form: "#rrggbb",...
Definition
TColor.cxx:1839
TEnv::GetValue
virtual Int_t GetValue(const char *name, Int_t dflt) const
Returns the integer value for a resource.
Definition
TEnv.cxx:491
TObject::Draw
virtual void Draw(Option_t *option="")
Default Draw method for all objects.
Definition
TObject.cxx:274
TPad
The most important graphics class in the ROOT system.
Definition
TPad.h:28
TText
Base class for several text objects.
Definition
TText.h:22
n
const Int_t n
Definition
legend1.C:16
tutorials
graphics
greyscale.C
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