boxobserver.py

this is the most basic to learn python

#: c10:BoxObserver.py
""" Written by Kevin Altis as a first-cut for
converting BoxObserver to Python. The Observer
hasn't been integrated yet.
To run this program, you must:
Install WxPython from
http://www.wxpython.org/download.php
Install PythonCard. See:
http://pythoncard.sourceforge.net
"""

from PythonCardPrototype import log, model
import random

GRID = 8

class ColorBoxesTest(model.Background):
  def on_openBackground(self, target, event):
    self.document = []
    for row in range(GRID):
      line = []
      for column in range(GRID):
        line.append(self.createBox(row, column))
      self.document.append(line[:])
  def createBox(self, row, column):
    colors = ['black', 'blue', 'cyan',
    'darkGray', 'gray', 'green',
    'lightGray', 'magenta',
    'orange', 'pink', 'red',
    'white', 'yellow']
    width, height = self.panel.GetSizeTuple()
    boxWidth = width / GRID
    boxHeight = height / GRID
    log.info("width:" + str(width) +
      " height:" + str(height))
    log.info("boxWidth:" + str(boxWidth) +
      " boxHeight:" + str(boxHeight))
    # use an empty image, though some other
    # widgets would work just as well
    boxDesc = {'type':'Image',
      'size':(boxWidth, boxHeight), 'file':''}
    name = 'box-%d-%d' % (row, column)
    # There is probably a 1 off error in the
    # calculation below since the boxes should
    # probably have a slightly different offset
    # to prevent overlaps
    boxDesc['position'] =
      (column * boxWidth, row * boxHeight)
    boxDesc['name'] = name
    boxDesc['backgroundColor'] =
      random.choice(colors)
    self.components[name] =  boxDesc
    return self.components[name]

  def changeNeighbors(self, row, column, color):

    # This algorithm will result in changing the
    # color of some boxes more than once, so an
    # OOP solution where only neighbors are asked
    # to change or boxes check to see if they are
    # neighbors before changing would be better
    # per the original example does the whole grid
    # need to change its state at once like in a
    # Life program? should the color change 
    # in the propogation of another notification
    # event?

    for r in range(max(0, row - 1), 
                   min(GRID, row + 2)):
      for c in range(max(0, column - 1), 
                     min(GRID, column + 2)):
        self.document[r][c].backgroundColor=color

  # this is a background handler, so it isn't  
  # specific to a single widget. Image widgets 
  # don't have a mouseClick event (wxCommandEvent
  # in wxPython)
  def on_mouseUp(self, target, event):
    prefix, row, column = target.name.split('-')
    self.changeNeighbors(int(row), int(column), 
                         target.backgroundColor)

if __name__ == '__main__':
  app = model.PythonCardApp(ColorBoxesTest)
  app.MainLoop()
#:~