Hello,
I restate the problem :
With the attached script "test_mathtext_wx.py" :
50 functions (line 31) : the 50 bitmaps are generated correctly, by when
I close the application an error appears in the console :
Assertion failed: ob_refcnt == 0, file CXX\cxx_extensions.cxx, line 1128
This application has requested the Runtime to terminate it in an unusual
way.
Please contact the application's support team for more information.
250 functions : the window never appears and the crash occurs (same message)
However, if in mathtext.py (mpl 0.98.5 win32 py2.5) line 2765 in
MathTextParser, I put "self._cache = dict()" instead of "self._cache =
maxdict(50)", the behavior of "test_mathtext_wx.py" is significantly
different.
50 functions : error on console after closing the application (no
difference here)
250 functions : NO CRASH (but error after closing the application)
And now, my questions :
Is this proof that "maxdict" is the cause of the problem ?
Is there a known way to avoid the problem?
Can someone tell me more about maxdict ?
Hoping to have been quite clear,
Cédrick
"""
Demonstrates how to convert mathtext to a wx.Bitmap for display in various
controls on wxPython.
"""
import matplotlib
matplotlib.use("WxAgg")
from numpy import arange, sin, pi, cos, log
from matplotlib.backends.backend_wxagg import FigureCanvasWxAgg as FigureCanvas
from matplotlib.backends.backend_wx import NavigationToolbar2Wx
from matplotlib.figure import Figure
import wx
IS_GTK = 'wxGTK' in wx.PlatformInfo
IS_WIN = 'wxMSW' in wx.PlatformInfo
IS_MAC = 'wxMac' in wx.PlatformInfo
############################################################
# This is where the "magic" happens.
from matplotlib.mathtext import MathTextParser
mathtext_parser = MathTextParser("Bitmap")
def mathtext_to_wxbitmap(s):
ftimage, depth = mathtext_parser.parse(s, 150)
return wx.BitmapFromBufferRGBA(
ftimage.get_width(), ftimage.get_height(),
ftimage.as_rgba_str())
############################################################
functions = []
for i in range(250):
functions.append((r'$\frac{x}{%d}$' % i, lambda x: x))
class CanvasFrame(wx.Frame):
def __init__(self, parent, title):
wx.Frame.__init__(self, parent, -1, title, size=(550, 350))
self.SetBackgroundColour(wx.NamedColor("WHITE"))
self.scroll = wx.ScrolledWindow(self, -1)
self.scroll.SetScrollRate(20,20)
self.sizer = wx.BoxSizer(wx.VERTICAL)
for f in functions:
self.sizer.Add(wx.StaticBitmap(self.scroll, -1,
mathtext_to_wxbitmap(f[0])))
self.scroll.FitInside()
self.scroll.SetSizer(self.sizer)
class MyApp(wx.App):
def OnInit(self):
frame = CanvasFrame(None, "wxPython mathtext demo app")
self.SetTopWindow(frame)
frame.Show(True)
return True
app = MyApp()
app.MainLoop()
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