A problem of masked "pcolorfast" on WXAgg

Community matplotlib-users
1

Hello List,

I found a problem that masked “pcolorfast” does not work properly in zooming,

It seems that masked area is not refreshed after zooming on “WXAgg”.

I think “pcolorfast” works well on pylab.plot though.

“pcolormesh” is the same while "pcolor"acts appropriately,

Please look at the attached picture and try the sample program.

My environment is;

Windows XP

Python 2.4

WxPython 2.8

matplotlib 0.91.2

Noriko Minakawa

AfterZoom.JPG

maskedpcolor.py (2.06 KB)

2

This is a longstanding problem with the quadmesh extension code that is
used by pcolorfast when the grid is not rectangular. It is not likely
to be fixed on the maintenance branch, but it is fixed on the svn trunk,
thanks to work by Michael Drooettboom.

Eric

minakawa wrote:

···

Hello List,
I found a problem that masked "pcolorfast" does not work properly in zooming,
It seems that masked area is not refreshed after zooming on "WXAgg".
I think "pcolorfast" works well on pylab.plot though.
"pcolormesh" is the same while "pcolor"acts appropriately, Please look at the attached picture and try the sample program.
My environment is;
    Windows XP
   Python 2.4
   WxPython 2.8
   matplotlib 0.91.2
Noriko Minakawa

------------------------------------------------------------------------

------------------------------------------------------------------------

���#!/usr/bin/env python

import numpy as npy
import matplotlib.numerix as nx

import matplotlib.numerix.ma as ma
from matplotlib import cm, colors

import matplotlib

matplotlib.use('WXAgg')
from matplotlib.backends.backend_wxagg import FigureCanvasWxAgg as FigureCanvas
from matplotlib.backends.backend_wx import NavigationToolbar2Wx

from matplotlib.figure import Figure

import wx

class CanvasFrame(wx.Frame):

    def __init__(self):
        wx.Frame.__init__(self,None,-1,
                         'CanvasFrame',size=(550,350))

# self.SetBackgroundColour(wx.NamedColor("WHITE"))

        self.figure = Figure()
        ax1 = self.figure.add_subplot(121)
        ax2 = self.figure.add_subplot(122)

        x = npy.arange(0, 4.0, 0.05, dtype=float)
        y = npy.arange(0, 5.0, 0.05, dtype=float)

        z = npy.sqrt(x[npy.newaxis,:-1]**2 + y[:-1,npy.newaxis]**2)

        Z = ma.masked_where(z < 1, z)

        X, Y = npy.meshgrid(x,y)

        ax1.pcolor(X,Y,Z)
        ax2.pcolorfast(X,Y,Z)

        ax1.set_title('pcolor')
        ax2.set_title('pcolorfast')

        self.canvas = FigureCanvas(self, -1, self.figure)

        self.sizer = wx.BoxSizer(wx.VERTICAL)
        self.sizer.Add(self.canvas, 1, wx.LEFT | wx.TOP | wx.GROW)
        self.SetSizer(self.sizer)
        self.Fit()

        self.add_toolbar() # comment this out for no toolbar

    def add_toolbar(self):
        self.toolbar = NavigationToolbar2Wx(self.canvas)
        self.toolbar.Realize()
        tw, th = self.toolbar.GetSizeTuple()
        fw, fh = self.canvas.GetSizeTuple()
         self.toolbar.SetSize(wx.Size(fw, th))
        self.sizer.Add(self.toolbar, 0, wx.LEFT | wx.EXPAND)

        # update the axes menu on the toolbar
        self.toolbar.update()

    def OnPaint(self, event):
        self.canvas.draw()

class App(wx.App):

    def OnInit(self):
        'Create the main window and insert the custom frame'
        frame = CanvasFrame()
        frame.Show(True)

        return True

app = App(0)
app.MainLoop()