demo.py

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## \file
## \ingroup tutorial_pyroot
## To run, do an "execfile( '<path-to>/demo.py' )" or "python <path-to>/demo.py"
##
## \macro_code
##
## \author Wim Lavrijsen
 
import os, sys
import ROOT
 
# To run, do an "execfile( '<path-to>/demo.py' )" or "python <path-to>/demo.py"
 
# enable running from another directory than the one where demo.py resides
workdir = os.path.dirname( sys.argv[0] )
if workdir:
   os.chdir( workdir )
 
# This macro generates a Controlbar menu.
# To execute an item, click with the left mouse button.
# To see the HELP of a button, click on the right mouse button.
 
ROOT.gStyle.SetScreenFactor(1)   # if you have a large screen, select 1.2 or 1.4
 
bar = ROOT.TControlBar( 'vertical', 'Demos', 10, 10 )
 
# The callbacks to python work by having CINT call the python interpreter through
# the "TPython" class. Note the use of "raw strings."
bar.AddButton( 'Help on Demos', r'TPython::Exec( "execfile( \'demoshelp.py\' )" );', 'Click Here For Help on Running the Demos' )
bar.AddButton( 'browser',       r'TPython::Exec( "b = ROOT.TBrowser()" );',          'Start the ROOT browser' )
bar.AddButton( 'framework',     r'TPython::Exec( "execfile( \'framework.py\' )" );', 'An Example of Object Oriented User Interface' )
bar.AddButton( 'first',         r'TPython::Exec( "execfile( \'first.py\' )" );',     'An Example of Slide with Root' )
bar.AddButton( 'hsimple',       r'TPython::Exec( "execfile( \'hsimple.py\' )" );',   'Creating histograms/Ntuples on file', "button" )
bar.AddButton( 'hsum',          r'TPython::Exec( "execfile( \'hsum.py\' )" );',      'Filling Histograms and Some Graphics Options' )
bar.AddButton( 'formula1',      r'TPython::Exec( "execfile( \'formula1.py\' )" );',  'Simple Formula and Functions' )
bar.AddButton( 'surfaces',      r'TPython::Exec( "execfile( \'surfaces.py\' )" );',  'Surface Drawing Options' )
bar.AddButton( 'fillrandom',    r'TPython::Exec( "execfile( \'fillrandom.py\' )" );','Histograms with Random Numbers from a Function' )
bar.AddButton( 'fit1',          r'TPython::Exec( "execfile( \'fit1.py\' )" );',      'A Simple Fitting Example' )
bar.AddButton( 'multifit',      r'TPython::Exec( "execfile( \'multifit.py\' )" );',  'Fitting in Subranges of Histograms' )
bar.AddButton( 'h1draw',        r'TPython::Exec( "execfile( \'h1draw.py\' )" );',    'Drawing Options for 1D Histograms' )
bar.AddButton( 'graph',         r'TPython::Exec( "execfile( \'graph.py\' )" );',     'Example of a Simple Graph' )
bar.AddButton( 'gerrors',       r'TPython::Exec( "execfile( \'gerrors.py\' )" );',   'Example of a Graph with Error Bars' )
bar.AddButton( 'tornado',       r'TPython::Exec( "execfile( \'tornado.py\' )" );',   'Examples of 3-D PolyMarkers' )
bar.AddButton( 'shapes',        r'TPython::Exec( "execfile( \'shapes.py\' )" );',    'The Geometry Shapes' )
bar.AddButton( 'geometry',      r'TPython::Exec( "execfile( \'geometry.py\' )" );',  'Creation of the NA49 Geometry File' )
bar.AddButton( 'na49view',      r'TPython::Exec( "execfile( \'na49view.py\' )" );',  'Two Views of the NA49 Detector Geometry' )
bar.AddButton( 'file',          r'TPython::Exec( "execfile( \'file.py\' )" );',      'The ROOT File Format' )
bar.AddButton( 'fildir',        r'TPython::Exec( "execfile( \'fildir.py\' )" );',    'The ROOT File, Directories and Keys' )
bar.AddButton( 'tree',          r'TPython::Exec( "execfile( \'tree.py\' )" );',      'The Tree Data Structure' )
bar.AddButton( 'ntuple1',       r'TPython::Exec( "execfile( \'ntuple1.py\' )" );',   'Ntuples and Selections' )
bar.AddButton( 'rootmarks',     r'TPython::Exec( "execfile( \'rootmarks.py\' )" );', 'Prints an Estimated ROOTMARKS for Your Machine' )
bar.AddSeparator()       # not implemented
bar.AddButton( 'make ntuple',   r'TPython::Exec( "execfile( \'mrt.py\' )" );',       'Convert a text file to an ntuple' )
 
bar.Show()
 
ROOT.gROOT.SaveContext()
 
 
## wait for input to keep the GUI (which lives on a ROOT event dispatcher) alive
if __name__ == '__main__':
   rep = ''
   while not rep in [ 'q', 'Q' ]:
      # Check if we are in Python 2 or 3
      if sys.version_info[0] > 2:
         rep = input( 'enter "q" to quit: ' )
      else:
         rep = raw_input( 'enter "q" to quit: ' )
      if 1 < len(rep):
         rep = rep[0]