Hello, Are there documented limitations on the types of things that can be done in event handlers in root? I have a handler that allows interactive selection of a region of interest of a histogram using the mouse: One performs the same mouse operations that are used for zoom along the x-axis. It works fine, until I add the fitting call - it performs the fit but never returns. (comment out the fit and it works fine) I use hsimple.root in the tutorials - any TH1F will work Here is my root session: root [0] TFile f("hsimple.root") root [1] hpx->Draw() <TCanvas::MakeDefCanvas>: created default TCanvas with name c1 root [2] c1->AddExec("ex1",".x event.c") root [3] ROI limits: -1.280000 1.280000 FCN=21723.2 FROM MIGRAD STATUS=CONVERGED 73 CALLS 74 TOTAL EDM=7.24727e-008 STRATEGY= 1 ERROR MATRIX UNCERTAINTY 1.4 per cent EXT PARAMETER STEP FIRST NO. NAME VALUE ERROR SIZE DERIVATIVE 1 Constant 7.95014e+002 2.94883e-001 5.95042e-005 3.14561e-004 2 Mean 9.96928e-003 4.72499e-004 -1.30032e-006 1.79069e-001 3 Sigma 1.00597e+000 7.17379e-004 -5.21731e-006 1.88585e+000 CTRL-C hit !!! ROOT is terminated ! [Note: I had to control-C out - no cpu was being used, root simply hung] and here is my event handler - event.c { // // This allows selection of an ROI: // Float_t roiLo,roiHi; int ix,ixl,ixh; int event = gPad->GetEvent(); // only care about Button1Down (1) and Button1Up(11) events if ((event!=1) && (event!=11) ) return; TObject *select = gPad->GetSelected(); // only care if selected item is x-axis if (strcmp(select->GetName(),"xaxis")!=0) return; ix = gPad->GetEventX(); TAxis *h = (TAxis*)select; if (event==1) // button down { // compute lower limit of ROI roiLo = gPad->AbsPixeltoX(ix); ixl = h->FindBin(roiLo); roiLo = h->GetBinLowEdge(ixl); } else // button up { // disable event gPad->DeleteExec("ex1"); // compute upper limit of ROI roiHi = gPad->AbsPixeltoX(ix); ixh = h->FindBin(roiHi); roiHi = h->GetBinLowEdge(ixh)+h->GetBinWidth(ixh); printf(" ROI limits: %f %f\n",roiLo,roiHi); TH1F *parent = (TH1F *)h->GetParent(); parent->Fit("gaus","w","",roiLo,roiHi); } } I am running version 3.02/06 of root on Win2000. I am using VC++ v6 w/sp5. Thanks.. Ed Oltman
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