Logo ROOT   6.21/01
Reference Guide
rose_image.C File Reference

Detailed Description

View in nbviewer Open in SWAN Display image in a new canvas and pad.

pict1_rose_image.C.png
#include "TImage.h"
#include "TCanvas.h"
#include "TArrayD.h"
#include "TROOT.h"
#include "TColor.h"
#include "TAttImage.h"
#include "TEnv.h"
void rose_image()
{
TImage *img = TImage::Open(dir + "/image/rose512.jpg");
if (!img) {
printf("Could not create an image... exit\n");
return;
}
img->SetConstRatio(0);
TString bc = "BlackChancery.ttf";
TString ar = "arial.ttf";
// draw text over image with funny font
img->DrawText(120, 160, "Hello World!", 32,
gROOT->GetColor(4)->AsHexString(),
// draw text over image with foreground specified by pixmap
img->DrawText(250, 350, "goodbye cruel world ...", 24, 0,
ar, TImage::kPlain, dir + "/image/fore.xpm");
TImage *img2 = TImage::Open(dir + "/image/mditestbg.xpm");
// tile image
img2->Tile(img->GetWidth(), img->GetHeight());
c1 = new TCanvas("rose512", "examples of image manipulations", 760, 900);
c1->Divide(2, 3);
c1->cd(1);
img->Draw("xxx");
c1->cd(2);
// averaging with mditestbg.xpm image
TImage *img3 = (TImage*)img->Clone("img3");
img3->Merge(img2, "allanon");
img3->Draw();
// contrasting (tint with itself)
c1->cd(3);
TImage *img4 = (TImage*)img->Clone("img4");
img4->Merge(img4, "tint");
// draw filled rectangle with magenta color
img4->FillRectangle("#FF00FF", 20, 220, 40, 40);
// Render multipoint alpha-blended gradient (R->G->B)
img4->Gradient(0, "#FF0000 #00FF00 #220000FF", 0, 50, 50, 100, 100);
// draw semi-transparent 3D button
img4->Bevel(300, 20, 160, 40, "#ffffffff", "#fe000000", 3, 0);
img4->DrawLine(10, 100, 100, 10, "#0000ff", 4);
img4->Draw();
// vectorize image. Reduce palette to 256 colors
c1->cd(4);
TImage *img5 = (TImage*)img->Clone("img5");
img5->Vectorize(256);
img5->Draw();
// quantization of the image
c1->cd(5);
TImage *img6 = (TImage*)img->Clone("img6");
TArrayD *arr = img6->GetArray(50, 40, pal);
img6->SetImage(arr->GetArray(), 50, 40, pal);
img6->Draw();
// HSV adjustment (convert red to yellow)
c1->cd(6);
TImage *img7 = (TImage*)img->Clone("img7");
img7->HSV(0, 40, 40);
img7->Draw();
}
Author
Valeriy Onuchin

Definition in file rose_image.C.