text: #!/usr/bin/env python
  #Copyright (c) 2011 Walter Bender
  #
  # This program is free software; you can redistribute it and/or modify
  # it under the terms of the GNU General Public License as published by
  # the Free Software Foundation; either version 2 of the License, or
  # (at your option) any later version.
  #
  # This program is distributed in the hope that it will be useful,
  # but WITHOUT ANY WARRANTY; without even the implied warranty of
  # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  # GNU General Public License for more details.
  #
  # You should have received a copy of the GNU General Public License
  # along with this program; if not, write to the Free Software
  # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  
  import os
  
  from gettext import gettext as _
  
  from plugins.plugin import Plugin
  
  from TurtleArt.tapalette import make_palette
  from TurtleArt.tautils import debug_output
  from TurtleArt.taprimitive import Primitive
  
  import logging
  _logger = logging.getLogger('turtleart-activity accelerometer plugin')
  
  
  ACCELEROMETER_DEVICE = '/sys/devices/platform/lis3lv02d/position'
  
  
  class Accelerometer(Plugin):
  
      def __init__(self, parent):
          Plugin.__init__(self)
          self._parent = parent
          if os.path.exists(ACCELEROMETER_DEVICE):
              self._status = True
          else:
              self._status = False
          self.running_sugar = self._parent.running_sugar
  
      def setup(self):
          # set up accelerometer specific blocks
          palette = make_palette('sensor',
                                 colors=["#FF6060", "#A06060"],
                                 help_string=_('Palette of sensor blocks'),
                                 position=6)
  
          if self._status:
              palette.add_block('xyz',
                                style='basic-style-extended-vertical',
                                label=_('acceleration'),
                                help_string=\
                                    _('push acceleration in x, y, z to heap'),
                                prim_name='xyz')
          else:
              palette.add_block('xyz',
                                style='basic-style-extended-vertical',
                                label=_('acceleration'),
                                help_string=\
                                    _('push acceleration in x, y, z to heap'),
                                hidden=True,
                                prim_name='xyz')
  
          self._parent.lc.def_prim(
              'xyz', 0,
              Primitive(self.prim_xyz))
  
      def _status_report(self):
          debug_output('Reporting accelerator status: %s' % (str(self._status)))
          return self._status
  
      # Block primitives used in talogo
  
      def prim_xyz(self):
          ''' push accelerometer xyz to stack '''
          if not self._status:
              self._parent.lc.heap.append(0)
              self._parent.lc.heap.append(0)
              self._parent.lc.heap.append(0)
          else:
              fh = open(ACCELEROMETER_DEVICE)
              string = fh.read()
              xyz = string[1:-2].split(',')
              self._parent.lc.heap.append(float(xyz[2]) / 18)
              self._parent.lc.heap.append(float(xyz[1]) / 18)
              self._parent.lc.heap.append(float(xyz[0]) / 18)
              fh.close()
  