#  ClickingsQt.java 

#  http://www.naturalprogramming.com/

#  2009-10-30  File received from Esa Pesonen.
#  2009-10-30  Last modification by Kari Laitinen

#  This program shows a window which you can click with the mouse.
#  The program 'draws' the clicked points to the screen.

#  This program was originally transformed from a PyGTK application
#  to a PyQt application by Esa Pesonen.

# http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qwidget.html
# http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qmouseevent.html

import sys

from PyQt4.QtCore import *
from PyQt4.QtGui import *


class ClickingsWindow( QWidget ) :

   def __init__( self, parent=None ) :

      QWidget.__init__( self, parent )

      self.setGeometry( 300, 300, 600, 400 )

      self.setWindowTitle( "CLICK THIS WINDOW WITH THE MOUSE" )

      self.list_of_clicking_coordinates  =  []


   #  We'll override the mousePressEvent() method (inherited from QWidget)

   def mousePressEvent( self, event ) :

      self.list_of_clicking_coordinates.append( ( event.x() , event.y() ) )

      self.update()

      

   def paintEvent( self, event ) :

      painter = QPainter()

      painter.begin( self )

      painter.setBrush( Qt.green )

      for clicking_coordinates  in  self.list_of_clicking_coordinates :

         #  Below 0 refers to the x coordinate and 1 refers to

         #  the y coordinate. These are stored in a tuple whose length is 2.

         coordinates_as_text = ( "(%d, %d)"  %  clicking_coordinates ) 

         painter.drawEllipse( clicking_coordinates[ 0 ] - 3,
                              clicking_coordinates[ 1 ] - 3, 6 , 6 )

         painter.drawText( clicking_coordinates[ 0 ] + 7,
                           clicking_coordinates[ 1 ] + 5, coordinates_as_text)

      painter.end()


#  The main program begins.

this_application = QApplication( sys.argv )

application_window = ClickingsWindow()

application_window.show()

this_application.exec_()