## \file

## \ingroup tutorial_pyroot

## \notebook

## A Simple Graph Example

##

## \macro_image

## \macro_output

## \macro_code

##

## \author Wim Lavrijsen

from __future__ import print_function

from ROOT import TCanvas, TGraph

from ROOT import gROOT

from math import sin

from array import array

c1 = TCanvas( 'c1', 'A Simple Graph Example', 200, 10, 700, 500 )

c1.SetFillColor( 42 )

c1.SetGrid()

n = 20

x, y = array( 'd' ), array( 'd' )

for i in range( n ):

x.append( 0.1*i )

y.append( 10*sin( x[i]+0.2 ) )

print(' i %i %f %f ' % (i,x[i],y[i]))

gr = TGraph( n, x, y )

gr.SetLineColor( 2 )

gr.SetLineWidth( 4 )

gr.SetMarkerColor( 4 )

gr.SetMarkerStyle( 21 )

gr.SetTitle( 'a simple graph' )

gr.GetXaxis().SetTitle( 'X title' )

gr.GetYaxis().SetTitle( 'Y title' )

gr.Draw( 'ACP' )

# TCanvas.Update() draws the frame, after which one can change it

c1.Update()

c1.GetFrame().SetFillColor( 21 )

c1.GetFrame().SetBorderSize( 12 )

c1.Modified()

c1.Update()