Hello
I would like some help to understand a problem with matplotlib and
wxpython.
I am developping a GUI where my plots are embedded on wxPanels on a
wxNotebook (tabs). Under Windows, some themes don't use a single colour
but a gradient as the tab background. Therefore, I'd like to make the
background of my plots transparent.
Under Windows XP (whatever the theme), when I set the facecolor of the
plot to 'none', the plot background becomes transparent, but the parts
of the panel and of the notebook below as well, and I end up seeing
other windows behind my GUI or the Windows desktop. I was expecting the
transparency to "stop" at the layer below the plot and therefore see
the.
I did a second experiment, where I overlayed two plots. The top one is
larger than the one below. I make the top one partially transparent, to
see the one below. The transparency is "stopped" in the area of the
inferior plot, I see the desktop on the remaining parts, and where there
is no plot the background of my panel.
I'm attaching the code for the second experiment.
I'm running XP 32bits with the Classic theme, python 2.7.3, matplotlib
1.2.0 and wxpython 2.9.4-msw.
Thanks for your help
--
Sylvain
import wx
import matplotlib
matplotlib.use('WXAgg')
from matplotlib.patches import Rectangle
from matplotlib.figure import Figure
from matplotlib.backends.backend_wxagg import FigureCanvasWxAgg
import wxversion
import sys
class MyFrame ( wx.Frame ):
def __init__( self, parent ):
wx.Frame.__init__ ( self, parent, id = wx.ID_ANY, title =
wx.EmptyString, pos = wx.DefaultPosition, size = wx.Size( 300,650 ), style =
wx.DEFAULT_FRAME_STYLE|wx.TAB_TRAVERSAL )
self.SetSizeHintsSz( wx.DefaultSize, wx.DefaultSize )
bSizer4 = wx.BoxSizer( wx.VERTICAL )
self.m_panel2 = wx.Panel( self, wx.ID_ANY, wx.DefaultPosition,
wx.DefaultSize, wx.TAB_TRAVERSAL )
self.m_panel2.SetBackgroundColour( wx.SystemSettings.GetColour(
wx.SYS_COLOUR_ACTIVECAPTION ) )
bSizer4.Add( self.m_panel2, 1, wx.EXPAND |wx.ALL, 5 )
self.m_panel2.Layout()
self.SetSizer( bSizer4 )
self.Layout()
self.Centre( wx.BOTH )
def __del__( self ):
pass
class MyPlot:
def __init__(self, panel):
self.panel = panel
# This figure is behind
self.panel.figure = Figure(figsize=(2,2), dpi=None)
self.panel.canvas = FigureCanvasWxAgg(self.panel, -1, self.panel.figure)
self.panel.axes = self.panel.figure.add_axes([0.3,0.3,0.5,0.5])
patch = Rectangle((0,0), 0.3, 0.2, facecolor='red')
self.panel.axes.add_patch(patch)
# This figure is on top
self.panel.figure2 = Figure(figsize=(3,3), dpi=None)
self.panel.canvas2 = FigureCanvasWxAgg(self.panel, -1,
self.panel.figure2)
self.panel.axes2 = self.panel.figure2.add_axes([0.3,0.3,0.5,0.5])
patch2 = Rectangle((0.5,0.5), 0.4, 0.1, facecolor='blue')
self.panel.axes2.add_patch(patch2)
# Make the top figure transparent
# self.panel.figure2.set_facecolor('None') # equivalent to
self.panel.figure2.patch.set_alpha(0)
# self.panel.figure.patch.set_alpha(0.5)
self.panel.figure2.patch.set_alpha(0.5)
# Draw everything
self.panel.Refresh()
self.panel.canvas.draw()
print "python " + str(sys.version_info)
print "wx " + str(wxversion.getInstalled())
print "matplotlib " + matplotlib.__version__
app = wx.App(0)
window = MyFrame(None)
plot = MyPlot(window.m_panel2)
window.Show()
app.MainLoop()------------------------------------------------------------------------------
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