Hi,
I don't have conclusive proof, .. but I suspect that the draw() of a
graph in a pyGTK application is order of magnitudes slower than I can
plot the same data in the default Tk graphing widget.
i.e. 5 sec in tk, ... and >1 minute in gtk
Obvious question, ... is this a know issue?
Is there any tricks in gtk to speed up the draw()
Attached is a heavily snipped example of bits and pieces of my code,
maybe I have structured my program incorrectly?
Thanks for any comments
Steve
--
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import matplotlib
matplotlib.use('GTK')
from matplotlib.figure import Figure
from matplotlib.axes import Subplot
from matplotlib.backends.backend_gtk import FigureCanvasGTK as FigureCanvas
from matplotlib.backends.backend_gtk import NavigationToolbar2GTK as NavigationToolbar
: :
<snip>
: :
try:
print 'Trying import pygtk',
import pygtk
pygtk.require("2.0")
print '...success'
except:
print '...failure'
pass
try:
print 'Trying import gtk',
import gtk
import gtk.glade
import gobject
print '...success'
except:
print '...failure'
sys.exit(1)
: :
<snip>
: :
class appGUI(gobject.GObject):
__gsignals__ = {
'stevesSignal': (gobject.SIGNAL_RUN_LAST, gobject.TYPE_NONE,(gobject.TYPE_FLOAT,)),
'gui-StartTests': (gobject.SIGNAL_RUN_LAST, gobject.TYPE_NONE,[])
}
SpeedCheckBoxNames = ['1p25K_Btn', '2p5K_Btn', '5K_Btn','12p5K_Btn', '25K_Btn', '37p5K_Btn', '75K_Btn', '100K_Btn', '150K_Btn']
def __init__(self):
gobject.GObject.__init__(self)
: :
<snip>
: :
#setup matplotlib stuff on second notebook page (Profile)
self.profile_figure = Figure(figsize=(16,4), dpi=72)
self.profile_axis = self.profile_figure.add_subplot(111)
self.profile_axis.set_xlabel('Fringe position')
self.profile_axis.set_ylabel('Force (mA)')
self.profile_axis.set_title("OBE6 VoiceCoil Force Profile")
self.profile_axis.grid(True)
self.profile_axis.xaxis.grid(True, which="major", linestyle='-')
self.profile_axis.xaxis.grid(True, which="minor")
self.profile_canvas = FigureCanvas(self.profile_figure) # a gtk Drawing area
self.profile_canvas.show()
self.profile_graphview = self.wTree.get_widget("profile_vbox")
if self.profile_graphview == None:
self.log.error( 'profile_graphview is empty')
self.profile_graphview.pack_start(self.profile_canvas, True, True)
self.profile_toolbar = NavigationToolbar(self.profile_canvas, self.win)
self.profile_toolbar.set_size_request(-1, 25)
self.navBox = gtk.HBox(False, 10)
self.profile_graphview.pack_start(self.navBox, False, False)
self.navBox.set_size_request(35, 35)
self.navBox.show()
self.combo = gtk.combo_box_new_text()
self.combo.set_size_request(-1, 25)
self.combo.show()
self.sep = gtk.VSeparator()
self.sep.show()
self.navBox.pack_start(self.combo, False, False)
self.navBox.pack_start(self.sep, False, False)
self.navBox.pack_start(self.profile_toolbar, True, True)
: :
<snip>
: :
def plotFrictionProfile(self, widget):
#Check what data (speed) to plot
spdIdx = self.combo.get_active()
spdToShow = self.cntlr.testingSpeeds[spdIdx]
self.log.debug("Starting plot ..................")
#start = time.clock()
figBG = 'w' # the figure background color
axesBG = '#f6f6f6' # the axies background color
purple = '#660033'
red = 'r'
green = 'g'
blue = 'b'
textsize = 8 # size for axes text
while True:
try:
self.log.info( 'Clear Axis')
# empty axis if neccesary, and reset title and stuff
#TODO: Need to remove any left over axis from the figure first
self.profile_axis.clear()
self.profile_axis.set_xlabel('Samples')
self.profile_axis.set_ylabel('VcSense (%s)'% self.units_str)
self.profile_axis.set_title("%s - VoiceCoil Force @ %s\n %s" % (self.inst.config.get_property('SerialNo'),self.cntlr.speedMap[spdToShow][self.cntlr.SM_NAME], self.cntlr.starttime.ctime() ) )
self.profile_axis.grid(True)
self.profile_axis.xaxis.grid(True, which="major", linestyle='-')
self.profile_axis.xaxis.grid(True, which="minor")
#Due to slow draw(), slower speeds need to be decimated to reduce data
if spdToShow == SPEED5Kz:
dataToPlot = Smooth(self.d_force[spdIdx], 4, 2, 0, 4)
elif spdToShow == SPEED2p5Kz:
dataToPlot = Smooth(self.d_force[spdIdx], 4, 2, 0, 8)
else:
dataToPlot = Smooth(self.d_force[spdIdx], 4, 2, 0, 1)
r = self.profile_axis.plot(dataToPlot, color=blue)
#This is were all the time is wasted (if i dont decimate the data it in the order of minutes for the slowest speed)
print '### BEFORE draw() ####'
self.profile_canvas.draw()
print '### AFTER draw() ####'
break
except ValueError:
self.log.exception( '#$^#$^#$^ FAILED TO CREATE PROFILE GRAPH #$^#$^#$^')
break
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