See the following URLs: http://root.cern.ch/root/htmldoc/TPad.html#TPad:AddExec http://root.cern.ch/root/htmldoc/TPad.html#TPad:WaitPrimitive For example, assuming an existing pad pointed by gPad, the following lines will wait until : - you have started the graphics editor from the canvas menu "edit" - selected the item "PolyLine" - clicked on a list of points (double click on the last point to terminate the list) root > hpx.Draw() root > TGraph *gr = (TGraph*)gPad->WaitPrimitive() root > gr->Print("all") Rene Brun Harufumi Tsuchiya wrote: > > Hi, Rooters, > > I would like to do the following. > > If click some data point in graph, I would like to > get the coordinate of the data point on display or > write the coordinate on file. > > Is this possible by using ROOT ? > > Now, I use ROOT version 3.00/06 on Red Hat 7.0. > > Regards, > > Harufumi Tsuchiya.
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