The difference for dividing TPad

[zs155167]

I find that there are some differences :

1. I divide the pad p1->Divide(4,1,0,0) then p1->SetBottomMargin(0.2);

2.p1->SetBottomMargin(0.2) then p1->Divide(4,1,0,0)

For these two method , the distance for the Bottom to canvas will be different. I don’t know the reason.
Thank you very much!

[linev]

Hi,

After p1->Divide(4,1,0,0) change of margin in the canvas does not affect already created sub-pads.

If you configure bottom margin before calling TPad::Divide() method, new value will be used also for new sub-pads. Therefore you are see difference - normally default margin value is 0.1.

Regards,
Sergey

[zs155167]

Oh… I just consider that p1->Divide(4,1,0,0) will set the margin to 0. As for your opion , does the SetBottomMargin(0.2) will covert the new value like 0.2 to Divide() function?

[linev]

Hi,

Margins in the pad defines space between pad boundaries and frame where histograms are drawn.

Then you call Divide, margin parameters have other meaning - it is space which remains empty when creating new sub-pads. Therefore p1->SetBottomMargin(0.2) does not affect position and size of subpads, but rather affects drawing of histograms in these subpads later.

Regards,
Sergey

[zs155167]

OK, thank you very much!