After searching through the forums and trying many different things I have
been unable to get animation working correctly using matplotlib in my python
application. I'm hoping one of the experts here can take a quick look at my
code and tell me what I am doing incorrectly.
What I am seeing is that the each line continues to be drawn as part of my
[timer] update call. I suspect that it is related to the 'hold' call but
changing the hold state had no effect. I've tried numerous different
scenarios based on available examples but so far nothing has seemed to help.
Here is the code:
import matplotlib as mpl
mpl.use('WXAgg')
mpl.rcParams['toolbar'] = 'None'
import wx
from matplotlib.backends.backend_wxagg import FigureCanvasWxAgg as Canvas
from matplotlib.figure import Figure
import numpy as num
# begin wxGlade: dependencies
# end wxGlade
# begin wxGlade: extracode
# end wxGlade
class HeartPanel(wx.Panel):
def __init__(self, *args, **kwds):
# begin wxGlade: HeartPanel.__init__
kwds["style"] = wx.RAISED_BORDER|wx.TAB_TRAVERSAL
wx.Panel.__init__(self, *args, **kwds)
self.__set_properties()
self.__do_layout()
# end wxGlade
mpl.rc('figure', fc='black', dpi=96, ec='black')
self.figure = Figure(figsize=(5.2, 1.25))
self.canvas = Canvas(self, -1, self.figure)
self.canvas.SetBackgroundColour(wx.Colour(0, 0, 0))
# self.canvas.draw()
self.bgnd = None
self.timer = wx.Timer(self, 5555)
self.Bind(wx.EVT_TIMER, self.on_timer, self.timer)
self.count = 0
def __set_properties(self):
# begin wxGlade: HeartPanel.__set_properties
self.SetMinSize((500,120))
self.SetBackgroundColour(wx.Colour(0, 0, 0))
self.SetForegroundColour(wx.Colour(0, 255, 0))
# end wxGlade
def __do_layout(self):
# begin wxGlade: HeartPanel.__do_layout
pass
# end wxGlade
# pylint: disable-msg=W0201
def init_plot(self):
'''
Method to initialize the plot that is used to animate the display.
'''
self.figure.subplots_adjust(left=0, top=1, right=1, bottom=0)
self.axes = self.figure.add_subplot(111)
if self.bgnd == None:
self.bgnd = self.canvas.copy_from_bbox(self.axes.bbox)
self.axes.set_axis_bgcolor('black')
self.x_data = num.arange(0, 2*num.pi, 0.01)
self.line = self.axes.plot(self.x_data, \
num.sin(self.x_data), \
color='green', \
figure=self.figure, \
lw=2, \
animated=True)
self.axes.hold(False)
def start_timer(self, time_value=100):
'''
Method to start the animation update timer.
'''
# self.axes.draw()
self.canvas.Show(True)
# self.canvas.draw()
self.count = 0
self.timer.Start(time_value, wx.TIMER_CONTINUOUS)
def stop_timer(self):
'''
Method to stop the animation update timer.
'''
self.canvas.Show(False)
self.timer.Stop()
def on_timer(self, event):
'''
Event handler for the animation update timer.
'''
self.count += 1
self.canvas.restore_region(self.bgnd)
# update the data
self.line[0].set_ydata(num.sin(self.x_data + self.count/10.0))
self.axes.clear()
# just draw the animated artist
self.axes.draw_artist(self.line[0])
# just redraw the axes rectangle
self.canvas.blit(self.axes.bbox)
# end of class HeartPanel
Any help is greatly appreciated.
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