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h1ReadAndDraw.py
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1## \file
2## \ingroup tutorial_pyroot
3## \notebook -js
4## A Simple histogram drawing example
5##
6## \macro_image
7## \macro_output
8## \macro_code
9##
10## \author Wim Lavrijsen
11
12from ROOT import TCanvas, TPad, TFile, TPaveLabel, TPaveText
13from ROOT import gROOT
14
15c1 = TCanvas( 'c1', 'Histogram Drawing Options', 200, 10, 700, 900 )
16
17pad1 = TPad( 'pad1', 'The pad with the function', 0.03, 0.62, 0.50, 0.92, 21 )
18pad2 = TPad( 'pad2', 'The pad with the histogram', 0.51, 0.62, 0.98, 0.92, 21 )
19pad3 = TPad( 'pad3', 'The pad with the histogram', 0.03, 0.02, 0.97, 0.57, 21 )
20pad1.Draw()
21pad2.Draw()
22pad3.Draw()
23#
24# We connect the ROOT file generated in a previous tutorial
25#
26example = TFile( 'py-hsimple.root' )
27example.ls()
28
29# Draw a global picture title
30title = TPaveLabel( 0.1, 0.94, 0.9, 0.98,
31 'Drawing options for one dimensional histograms' )
32title.SetFillColor( 16 )
33title.SetTextFont( 52 )
34title.Draw()
35#
36# Draw histogram hpx in first pad with the default option.
37pad1.cd()
38pad1.GetFrame().SetFillColor( 18 )
39hpx = gROOT.FindObject( 'hpx' )
40hpx.SetFillColor( 45 )
41hpx.DrawCopy()
42label1 = TPaveLabel( -3.5, 700, -1, 800, 'Default option' )
43label1.SetFillColor( 42 )
44label1.Draw()
45#
46# Draw hpx as a lego. Clicking on the lego area will show
47# a "transparent cube" to guide you rotating the lego in real time.
48pad2.cd()
49hpx.DrawCopy( 'lego1' )
50label2 = TPaveLabel( -0.72, 0.74, -0.22, 0.88, 'option Lego1' )
51label2.SetFillColor( 42 )
52label2.Draw()
53label2a = TPaveLabel( -0.93, -1.08, 0.25, -0.92, 'Click on lego to rotate' )
54label2a.SetFillColor( 42 )
55label2a.Draw()
56#
57# Draw hpx with its errors and a marker.
58pad3.cd()
59pad3.SetGridx()
60pad3.SetGridy()
61pad3.GetFrame().SetFillColor( 18 )
62hpx.SetMarkerStyle( 21 )
63hpx.Draw( 'e1p' )
64label3 = TPaveLabel( 2, 600, 3.5, 650, 'option e1p' )
65label3.SetFillColor( 42 )
66label3.Draw()
67#
68# The following illustrates how to add comments using a PaveText.
69# Attributes of text/lines/boxes added to a PaveText can be modified.
70# The AddText function returns a pointer to the added object.
71pave = TPaveText( -3.78, 500, -1.2, 750 )
72pave.SetFillColor( 42 )
73t1 = pave.AddText( 'You can move' )
74t1.SetTextColor( 4 )
75t1.SetTextSize( 0.05 )
76pave.AddText( 'Title and Stats pads' )
77pave.AddText( 'X and Y axis' )
78pave.AddText( 'You can modify bin contents' )
79pave.Draw()
80c1.Update()
The Canvas class.
Definition TCanvas.h:23
A ROOT file is a suite of consecutive data records (TKey instances) with a well defined format.
Definition TFile.h:54
The most important graphics class in the ROOT system.
Definition TPad.h:26
A Pave (see TPave) with a text centered in the Pave.
Definition TPaveLabel.h:20
A Pave (see TPave) with text, lines or/and boxes inside.
Definition TPaveText.h:21
h1 SetFillColor(kGreen)