Same scale in the three axis

ROOT
1

Hi there!

I would like to draw a T2DGraph with the same scale at each axis. In order to do that, I have calculated the maximum of the differences between the maximum and the minimum of each axis. Then, I have calculated the mean point of each axis and I have added +/- the half of the previous distance.

This is shown at the code below:

distance = max(max((f2DPlot->GetXmax()-f2DPlot->GetXmin()),
(f2DPlot->GetYmax()-f2DPlot->GetYmin())),
(f2DPlot->GetZmax()-f2DPlot->GetZmin())) / 2;

medX = (f2DPlot->GetXmax() + f2DPlot->GetXmin()) / 2;
medY = (f2DPlot->GetYmax() + f2DPlot->GetYmin()) / 2;
medZ = (f2DPlot->GetZmax() + f2DPlot->GetZmin()) / 2;

f2DPlot->GetXaxis()->SetLimits(medX-distance,medX+distance);
f2DPlot->GetYaxis()->SetLimits(medY-distance,medY+distance);
f2DPlot->GetZaxis()->SetLimits(medZ-distance,medZ+distance);

If I print out the value of limits, they are ok. However, when I call the method Draw(), the limits of the z axis are not the ones they are printed.

What had happened?

I thank your help in advance.

Francisco Iguaz
University of Zaragoza

2

Which option are you using in the Draw() method ?

3

Hi couet!

I’m using the option “PO”. The complete method in which I got a problem is at the attached file.

Many thanks in advance.

Francisco Iguaz
University of Zaragoza
Method.cxx (1.67 KB)

4

The attached example does what you want.
graph2dminmax.C (679 Bytes)

5

Hi couet!

Thank you for your help. It worked perfectly.

Cheers

Paco