[Matplotlib-users] Would like to update visible plot using pyside and matplotlib

[troyrock <tro...@ro...>]

I have a tool to show information extracted from various experiments and then
stored in a database.  I would like to update a plot shown in the lower half
of the window when information such as the ranges of variables are modified
in the upper half.  I can initially put data into the plot, however when I
want to change the contents (such as add another line to the plot), the 
changes don't get displayed.  Here is some code to illustrate the problem:

import matplotlib
matplotlib.rcParams['backend.qt4'] = 'PySide'
import matplotlib.pyplot as plt
from matplotlib.figure import Figure
matplotlib.use('Qt4Agg')
from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as
FigureCanvas
from PySide import QtCore, QtGui
import sys


class TabDialog(QtGui.QDialog):
   def __init__(self):
      super(TabDialog, self).__init__()

      tabWidget = QtGui.QTabWidget()
      tabWidget.addTab(AnalyzeTab(), self.tr("Analyze"))

      buttonLayout = QtGui.QHBoxLayout()
      saveButton = QtGui.QPushButton(self.tr("Update"))
      saveButton.clicked[bool].connect(self.update)
      buttonLayout.addWidget(saveButton)

      mainLayout = QtGui.QVBoxLayout()
      mainLayout.addWidget(tabWidget)
      mainLayout.addLayout(buttonLayout)
      self.setLayout(mainLayout)

   def update(self):
      data.update()

class DataHolder():
   def __init__(self):
      self.gFig = Figure()
      self.ax = self.gFig.add_subplot(111)
      self.ax.plot([1,2,4,0.1])
      self.canvas = FigureCanvas(self.gFig)

   def update(self):
      self.ax.plot([8,6,4,2])

class AnalyzeTab(QtGui.QWidget):
   def __init__(self, parent=None):
      QtGui.QWidget.__init__(self, parent)

      analyzeLayout = QtGui.QGridLayout()
      analyzeLayout.addWidget(data.canvas, 2, 0, 6, 8)

      self.setLayout(analyzeLayout)

if __name__ == "__main__":
   app = QtGui.QApplication(sys.argv)

   data = DataHolder()

   tabdialog = TabDialog()
   tabdialog.show()
   sys.exit(app.exec_())

Any suggestions are very much appreciated.



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