TPad::BuildLegend() Auto Positioning

ROOT
1

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Hi,

I am trying to use the TPad::BuildLegend() auto positioning feature on a TMultiGraph. Unfortunately the Legend is always built in the bottom left corner as in the example https://root.cern.ch/doc/master/classTMultiGraph.html. Is this a known bug or is there some work around using the gPad? I am on ROOT version 6.12/06.

Cheers
Dom

2

If you want to have it elsewhere, you need to explicitly define the coordinates.
Of course, you could also “move” it, after it is created / drawn in the “standard” place.

3

Thanks for the response. Out of curiosity will there be auto-placement implemented in the future? The BuildLegend()'s auto position works nicely with the TH1s.

Cheers
Dom

4

Can you provide a script showing the issue ? It might be multigraph are ignored.

5

Hi,

Sorry for the late reply I went on holiday and didn’t have chance beforehand to respond. Here is some example code taken from https://root.cern.ch/doc/master/classTMultiGraph.html and edited slightly. I notice if I draw the last TGraph, as in the example the BuildLegend notices this and move accordingly. If I just add it to the MultiGraph and draw then the BuildLegend is not moved. As you said the MultiGraph is ignored.

Cheers
Dom

ExampleBuildLegend.C (1.2 KB)

6

Now implemented in ROOT master (also for THStack).
Thanks.

7

Great! Thank you very much.

8

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