Multi-page PDF Graphics

ROOT
1

Hi,
How can I create a PDF file with many pages of graphics in it ? For example, if I have a macro that generates hundreds of different pages of graphics, how can put them all into one single PDF file, rather than creating a separate PDF file for each graphic ?

 Thanks.

-Arun

2 
{
   TFile f("hsimple.root","READ");
   c1 = new TCanvas("c1","sub data",200,10,700,500);

   hpx->Draw(); c1->Print("h1.pdf(","pdf");
   hpx->Draw(); c1->Print("h1.pdf","pdf");
   hpx->Draw(); c1->Print("h1.pdf)","pdf");
}
1 Like
3

It works great. Thanks a lot.
-Arun

4

Hi

I found this post useful But I have one problems. I am running pyroot (root 6.02 on Mavericks )

  1. I am producing many canvases (>100). If I save them individually as .png or .pdf files, they seem all right.
    However, when I try to save them all in one single PDF file, some labels disapear :frowning: Have a look to the attachments please.

  2. I tried to save them all in one png file with many pages, but the recippee doesn’t work. It says:
    Error in TASImage::WriteImage: cannot determine a valid file type
    (that comes from: Canvases[i].Print(“myfile.png[”,“png”) )

Is there a way to make all the labels to be stored in the many-pages pdf ? Is there a way to create a many pages png or tiff ?

Thanks in advance for your help
Salva
PlotsOfHits.pdf (196 KB)
nSCTHits.pdf (17 KB)

nSCTHits.png796Ă—572 8.46 KB

5

  1. have you tried a more recent version?

  2. by construction png files (and in general binary images) have only one image per file.

6

Hi

well… I just tried with 6.04 and 6.06. Unfortunatelly it doesn’t work now. This is the error I obtain:

maxYVal = 83384.8828125 , minYVal = 0.0
going to save file … as /Users/martis/projectes/atlas/alineament/webmonitoringtest/InDetAlignmentWebMonitor/trunk/WebPage/detailed_plots/2016//nPIXHits.pdf

*** Break *** segmentation violation
Traceback (most recent call last):
File “MakeMajorAlignMonPlots.py”, line 209, in
if (doHits): execfile(“MakeHitPlots.py”)
File “MakeHitPlots.py”, line 29, in
canvasText,makeOutput)
File “/Users/martis/projectes/atlas/alineament/webmonitoringtest/InDetAlignmentWebMonitor/trunk/database/Monitor/utilities.py”, line 514, in DrawPlots
can.SaveAs(outputName)
SystemError: void TPad::SaveAs(const char* filename = “”, const char* option = “”) =>
problem in C++; program state has been reset

No idea why this happens.

Cheers
Salva

7

can you post a small script reproducing the problem ?

8

Hi

unfortunatelly, my script is to big (actually it is a set of scripts calling each other) that reads many histogram files and plot them on top of the other.

I wrote a simple python script which does the same in a simplified way, and it almost works (no crash), only I was expecting to see only markers for the histograms, and there is one histogram that is drawn with a solid line. No idea why. If you may have a look :wink:

Comming back to the crash I have with 6.04 and 6.06, as said it is hard to debug as I create many canvases. They are properly saved until it crashes after saving an arbitrary number of canvases. It is quite reproducible. I mean, If I try to create 50 canvases, it works well, up to canvas number 30 something, then it crashes. If I retry, it crashes again exactly on the same, not in a different one.

This is the bit of code that crashes:
print " going to save file … as ", outputName

if makeOutput:
    print " can --> ", can
    can.Print()
    can.SaveAs(outputName)
    print " <DrawPlots> file ", outputName, " succesfuly stored "

This is the output when crashes:
going to save file … as /Users/martis/projectes/atlas/alineament/webmonitoringtest/InDetAlignmentWebMonitor/trunk/WebPage/detailed_plots/2016//nPIXHits.png
can --> <ROOT.TCanvas object ("/Users/martis/projectes/atlas/alineament/webmonitoringtest/InDetAlignmentWebMonitor/trunk/WebPage/detailed_plots/2016//nPIXHits.png") at 0x7fed2215c5b0>

*** Break *** segmentation violation
Traceback (most recent call last):
File “MakeMajorAlignMonPlots.py”, line 209, in
if (doHits): execfile(“MakeHitPlots.py”)
File “MakeHitPlots.py”, line 29, in
canvasText,makeOutput)
File “/Users/martis/projectes/atlas/alineament/webmonitoringtest/InDetAlignmentWebMonitor/trunk/database/Monitor/utilities.py”, line 515, in DrawPlots
can.Print()
TypeError: none of the 2 overloaded methods succeeded. Full details:
void TPad::Print(const char* filename = “”) =>
problem in C++; program state has been reset
void TPad::Print(const char* filename, const char* option) =>
takes at least 2 arguments (0 given)

Cheers
Salva
mytest.py (1.62 KB)

9

In your script, you are saving the canvas at the end of the macro.
That’s not the way multipage pdf is working.
See an example here:
root.cern.ch/doc/master/classTPDF.html