Hi Ulrich, this should be not much of a problem. Look at the code of TRootEmbeddedCanvas (http://root.cern.ch/root/html/src/TRootEmbeddedCanvas.cxx.html). All the magic happens in the ctor: Int_t wid = gGXW->InitWindow((ULong_t)GetViewPort()->GetId()); Window_t win = gGXW->GetWindowID(wid); fCanvasContainer = new TRootEmbeddedContainer(this, win, GetViewPort()); SetContainer(fCanvasContainer); fCanvas = new TCanvas(name, 10, 10, wid); First initialize a graphics window (gGXW->InitWindow), get is XID (win), pass win to Qt and tell it to monitor the desired events (this is what happens in TRootEmbeddedContainer). Next create a ROOT TCanvas with the wid as the working area. In this TCanvas the histograms will be displayed. On how the TRootEmbeddedCanvas is used check $ROOTSYS/test/guitest.cxx. If you have more detailed questions let me know directly. Also once you have it working let me know, because it would like to distribute the informations. Cheers, Fons. Ulrich Jost wrote: > > I have an existing GUI application (based on Qt), is it possible to > produce ROOT objects (ntuple, histograms etc) within it and make a plot > (canvas) within a widget of the other GUI? Maybe by defining a new > class which inherits the Qt widget class and the necessary ROOT > class. > > Thanks, Ulrich -- Org: CERN, European Laboratory for Particle Physics. Mail: 1211 Geneve 23, Switzerland E-Mail: Fons.Rademakers@cern.ch Phone: +41 22 7679248 WWW: http://root.cern.ch/~rdm/ Fax: +41 22 7677910
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