content: # -*- coding: utf-8 -*-
  
  """
  ***************************************************************************
      MeanAndStdDevPlot.py
      ---------------------
      Date                 : January 2013
      Copyright            : (C) 2013 by Victor Olaya
      Email                : volayaf at gmail dot com
  ***************************************************************************
  *                                                                         *
  *   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.                                   *
  *                                                                         *
  ***************************************************************************
  """
  
  __author__ = 'Victor Olaya'
  __date__ = 'January 2013'
  __copyright__ = '(C) 2013, Victor Olaya'
  # This will get replaced with a git SHA1 when you do a git archive
  __revision__ = '$Format:%H$'
  
  import matplotlib.pyplot as plt
  import matplotlib.pylab as lab
  import numpy as np
  from PyQt4.QtCore import *
  from qgis.core import *
  from sextante.parameters.ParameterTable import ParameterTable
  from sextante.parameters.ParameterTableField import ParameterTableField
  from sextante.core.GeoAlgorithm import GeoAlgorithm
  from sextante.outputs.OutputHTML import OutputHTML
  from sextante.tools import *
  from sextante.core.QGisLayers import QGisLayers
  
  class MeanAndStdDevPlot(GeoAlgorithm):
  
      INPUT = "INPUT"
      OUTPUT = "OUTPUT"
      NAME_FIELD = "NAME_FIELD"
      MEAN_FIELD = "MEAN_FIELD"
      STDDEV_FIELD = "STDDEV_FIELD"
  
  
      def processAlgorithm(self, progress):
          uri = self.getParameterValue(self.INPUT)
          layer = QGisLayers.getObjectFromUri(uri)
          namefieldname = self.getParameterValue(self.NAME_FIELD)
          meanfieldname = self.getParameterValue(self.MEAN_FIELD)
          stddevfieldname = self.getParameterValue(self.STDDEV_FIELD)
          output = self.getOutputValue(self.OUTPUT)
          values = vector.getAttributeValues(layer, namefieldname, meanfieldname, stddevfieldname)
          plt.close()
  
  
          ind = np.arange(len(values[namefieldname]))
          width = 0.8
          plt.bar(ind, values[meanfieldname], width,
                      color='r',
                      yerr=values[stddevfieldname],
                      error_kw=dict(ecolor='yellow'))
  
          plt.xticks(ind, values[namefieldname], rotation = 45)
          plotFilename = output +".png"
          lab.savefig(plotFilename)
          f = open(output, "w")
          f.write("<img src=\"" + plotFilename + "\"/>")
          f.close()
  
      def defineCharacteristics(self):
          self.name = "Mean and standard deviation plot"
          self.group = "Graphics"
          self.addParameter(ParameterTable(self.INPUT, "Input table"))
          self.addParameter(ParameterTableField(self.NAME_FIELD, "Category name field", self.INPUT,ParameterTableField.DATA_TYPE_ANY))
          self.addParameter(ParameterTableField(self.MEAN_FIELD, "Mean field", self.INPUT))
          self.addParameter(ParameterTableField(self.STDDEV_FIELD, "StdDev field", self.INPUT))
          self.addOutput(OutputHTML(self.OUTPUT, "Output"))
  
  
  
  
  
  