Chris Jillings wrote: > > Hi, > I am trying to make nice plots for a document. My canvas is divided > into two pads, one above the other. To make the labels large enough to > read on paper, I use > > gStyle->SetLabelSize(0.08); > gStyle->SetLabelSize(0.08,"yaxis"); > > The problem is the x-axis labels get pushed down, out of the pad. If > they are moved up to make them visible, they collide with the numbers. > I think my solution is to move the frame higher up in the pad. (I don't > use a title on the pads.) How do I do this in an automatic way? > To move the frame top/down/left/right, you can use TPad::SetTopMargin(0.1); TPad::SetBottomMargin(0.2); //default is 0.1 (10 per cent of pad) or if you prefer at the TStyle level gStyle->SetPadBottomMargin(0.2); > The second question is about getting axis information. How do I get the > range of the y-axis. I have tried > ymax = p1->GetUymax(); > ymin = p1->GetUymin(); > and it doesn't seem to work. Neither does TPad::GetRangeAxis(). > > Any ideas? > To get info about one axis, you must go via the object that has created the axis. This is typically a TH1F or TH2F object. For example, when you draw a 1-D histogram h1->Draw(); you can access the axis objects with TAxis *xaxis = h1->GetXaxis(); TAxis *yaxis = h1->GetYaxis() then (look in TAxis.h) Int_t nx = xaxis->GetNbins(); Float_t xmin = xaxis->GetXmin(); Float_t xmax = xaxis->GetXmax(); Float_t ymin = yaxis->GetXmin(); Float_t ymax = yaxis->GetYmax(); In the tutorials, we show several examples with histograms, graphs with errors or not and the different ways to access the axis info. Rene Brun
This archive was generated by hypermail 2b29 : Tue Jan 04 2000 - 00:34:35 MET