Logo ROOT   6.21/01
Reference Guide
rose_image.C
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1 /// \file
2 /// \ingroup tutorial_image
3 /// \notebook
4 /// Display image in a new canvas and pad.
5 ///
6 /// \macro_image
7 /// \macro_code
8 ///
9 /// \author Valeriy Onuchin
10 
11 #include "TImage.h"
12 #include "TCanvas.h"
13 #include "TArrayD.h"
14 #include "TROOT.h"
15 #include "TColor.h"
16 #include "TAttImage.h"
17 #include "TEnv.h"
18 
19 TCanvas *c1;
20 
21 void rose_image()
22 {
24 
25  TImage *img = TImage::Open(dir + "/image/rose512.jpg");
26 
27  if (!img) {
28  printf("Could not create an image... exit\n");
29  return;
30  }
31 
32  img->SetConstRatio(0);
34 
35  TString bc = "BlackChancery.ttf";
36  TString ar = "arial.ttf";
37 
38  // draw text over image with funny font
39  img->DrawText(120, 160, "Hello World!", 32,
40  gROOT->GetColor(4)->AsHexString(),
42 
43  // draw text over image with foreground specified by pixmap
44  img->DrawText(250, 350, "goodbye cruel world ...", 24, 0,
45  ar, TImage::kPlain, dir + "/image/fore.xpm");
46 
47  TImage *img2 = TImage::Open(dir + "/image/mditestbg.xpm");
48 
49  // tile image
50  img2->Tile(img->GetWidth(), img->GetHeight());
51 
52  c1 = new TCanvas("rose512", "examples of image manipulations", 760, 900);
53  c1->Divide(2, 3);
54  c1->cd(1);
55  img->Draw("xxx");
56  img->SetEditable(kTRUE);
57 
58  c1->cd(2);
59  // averaging with mditestbg.xpm image
60  TImage *img3 = (TImage*)img->Clone("img3");
61  img3->Merge(img2, "allanon");
62  img3->Draw();
63 
64  // contrasting (tint with itself)
65  c1->cd(3);
66  TImage *img4 = (TImage*)img->Clone("img4");
67  img4->Merge(img4, "tint");
68 
69  // draw filled rectangle with magenta color
70  img4->FillRectangle("#FF00FF", 20, 220, 40, 40);
71 
72  // Render multipoint alpha-blended gradient (R->G->B)
73  img4->Gradient(0, "#FF0000 #00FF00 #220000FF", 0, 50, 50, 100, 100);
74 
75  // draw semi-transparent 3D button
76  img4->Bevel(300, 20, 160, 40, "#ffffffff", "#fe000000", 3, 0);
77  img4->DrawLine(10, 100, 100, 10, "#0000ff", 4);
78  img4->Draw();
79 
80  // vectorize image. Reduce palette to 256 colors
81  c1->cd(4);
82  TImage *img5 = (TImage*)img->Clone("img5");
83  img5->Vectorize(256);
84  img5->Draw();
85 
86  // quantization of the image
87  c1->cd(5);
88  TImage *img6 = (TImage*)img->Clone("img6");
89  TImagePalette *pal = (TImagePalette *)&img5->GetPalette();
90  TArrayD *arr = img6->GetArray(50, 40, pal);
91  img6->SetImage(arr->GetArray(), 50, 40, pal);
92  img6->Draw();
93 
94  // HSV adjustment (convert red to yellow)
95  c1->cd(6);
96  TImage *img7 = (TImage*)img->Clone("img7");
97  img7->HSV(0, 40, 40);
98  img7->Draw();
99 }
static const TString & GetTutorialDir()
Get the tutorials directory in the installation. Static utility function.
Definition: TROOT.cxx:3066
virtual UInt_t GetHeight() const
Definition: TImage.h:229
return c1
Definition: legend1.C:41
virtual UInt_t GetWidth() const
Definition: TImage.h:228
const Double_t * GetArray() const
Definition: TArrayD.h:43
virtual void SetConstRatio(Bool_t constRatio=kTRUE)
Set (constRatio = kTRUE) or unset (constRadio = kFALSE) the ratio flag.
Definition: TAttImage.cxx:641
virtual Double_t * Vectorize(UInt_t=256, UInt_t=4, Int_t=0)
Definition: TImage.h:161
#define gROOT
Definition: TROOT.h:415
Basic string class.
Definition: TString.h:131
virtual void Draw(Option_t *option="")
Default Draw method for all objects.
Definition: TObject.cxx:195
An abstract interface to image processing library.
Definition: TImage.h:29
virtual void Merge(const TImage *, const char *="alphablend", Int_t=0, Int_t=0)
Definition: TImage.h:172
virtual void SetImageQuality(EImageQuality lquality)
Definition: TAttImage.h:99
virtual void SetImage(const Double_t *, UInt_t, UInt_t, TImagePalette *=0)
Definition: TImage.h:116
virtual void FillRectangle(const char *=0, Int_t=0, Int_t=0, UInt_t=0, UInt_t=0)
Definition: TImage.h:192
virtual void Bevel(Int_t=0, Int_t=0, UInt_t=0, UInt_t=0, const char *="#ffdddddd", const char *="#ff555555", UShort_t=1, Bool_t=kFALSE)
Definition: TImage.h:178
virtual const TImagePalette & GetPalette() const
Definition: TAttImage.h:88
virtual TObject * Clone(const char *) const
Make a clone of an object using the Streamer facility.
Definition: TImage.h:111
virtual void SetEditable(Bool_t=kTRUE)
Definition: TImage.h:225
The Canvas class.
Definition: TCanvas.h:31
virtual void DrawText(Int_t=0, Int_t=0, const char *="", Int_t=12, const char *=0, const char *="fixed", EText3DType=TImage::kPlain, const char *=0, Float_t=0)
Definition: TImage.h:200
virtual TArrayD * GetArray(UInt_t=0, UInt_t=0, TImagePalette *=gWebImagePalette)
Definition: TImage.h:234
A class to define a conversion from pixel values to pixel color.
Definition: TAttImage.h:33
Array of doubles (64 bits per element).
Definition: TArrayD.h:27
virtual void DrawLine(UInt_t, UInt_t, UInt_t, UInt_t, const char *="#000000", UInt_t=1)
Definition: TImage.h:184
virtual void Gradient(UInt_t=0, const char *="#FFFFFF #000000", const char *=0, Int_t=0, Int_t=0, UInt_t=0, UInt_t=0)
Definition: TImage.h:168
static TImage * Open(const char *file, EImageFileTypes type=kUnknown)
Open a specified image file.
Definition: TImage.cxx:119
virtual void HSV(UInt_t=0, UInt_t=360, Int_t=0, Int_t=0, Int_t=0, Int_t=0, Int_t=0, UInt_t=0, UInt_t=0)
Definition: TImage.h:164
const Bool_t kTRUE
Definition: RtypesCore.h:87
virtual void Tile(UInt_t, UInt_t)
Definition: TImage.h:148