Hi Rooters,
is there a possibility to update the range of the graph after the position of a
point has changed? I tried it with following macro, but it doesn't work. The
point number 2 is skipped now and the range of the Y axis does not change as I
expected reading the documentation.
Cheers Reiner.
{
gROOT->Reset();
Float_t x1, y1, x2, y2;
// Create a new canvas.
c1 = new TCanvas("c1","canvas",50,10,600,300);
// crate a pad
pad = new TPad("p1", "pad", 0.05, 0.05, 0.95, 0.95);
pad->SetFillColor(17);
pad->Draw();
// draw a graph
pad->cd();
Float_t x[] = {8., 10., 13., 14., 16.};
Float_t y[] = {1.2, 1.8, 6., 4., 4.};
TGraph * graph = new TGraph(5, x, y);
graph->Draw("AL");
c1->Update();
// now change a point and update range of axis
graph->SetPoint(2, 13., 8.);
pad->GetRangeAxis(x1, y1, x2, y2);
pad->RangeAxis(x1, y1, x2, y2 + 2);
pad->Modified();
c1->Update();
}
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