Hello I guess what you are looking for is TLine * l = dynamic_cast<TLine *>(gPad->GetSelected()); http://root.cern.ch/root/htmldoc/src/TPad.cxx.html#TPad:GetSelected > Hi Annalisa, > Thanks! > Your empirical Idea is fair! > But unfortunately form the canvas.C i see that Root initialises with the > name "line" > one TLine pointer at first, for the first > TLine; then Root reassigns to the same pointer all the > next TLines I draw....... > > Nevertheless I can modify at any time, with the mouse, all the TLines I > have > drawn. This means that Root must keep into some of its memory the > information about the ID > of each TLine. Of it does and this pointer can be found some how. > I need to know (for implementing an automathic routine) > such an address for each TLine! However I would not advice you too look for that pointer. I think it is not proper solution. Well I don't know your task and what you are tring to achieve. HOwever the generic advice is. 1. Derive your own class from TLine 2. Overload DistanceToPrimitve method a De Caro wrote: > > > Hi Tommaso, > > i don't understand very well your question. > > If you need to know the pointer to the lines drawn in a canvas, you can > > save this canvas as .C file and you can see the file content; > > ex: > > root [0] new TCanvas(); > > open the Editor menu, clik on Line button and draw the first line on the > > canvas, clik on Line button an other time and draw the second line ... > > Then, you can go on File menu and in Save As canvas.C; > > the file c1.C was created. You can see the content... > > I don't know if this can help you... > > Ciao > > Annalisa > > > > > Hi Rooters, > > > My question in the subject is because if i draw a TLine with the Editor on > > > a plot, > > > I get a pointer to it simply with > > > > > > TLine *l = TLine; > > > > > > > > > But if I draw more than one line, I don't know how to get the pointer to > > > the newer ones. (If I right-click with the mouse on the line, i get as the > > > header name TLine only, instead of for example TLine::pippo). > > > > > > Anyone can help? > > > > > > Thanks a lot, > > > Tommaso > > > > > > > > > > > > > > > > > > > >
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