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WXAgg backend not rendering nicely on retina #7720

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@LtMerlin

Description

@LtMerlin

When embedding a matplotlib plot in a WX.Panel, the figure_canvas is not rendered nicely on a retina display. Increasing the dpi of the figure does not help (it only alters the figure size).

Matplotlib version: 2.0.0rc2 (installed with pip) (same behaviour as with 1.5.3)
Python version: 2.7.13 (installed with homebrew)
Platform: OSX (macOS Sierra)

Plotting using standard MacOSX backend (no embedding):

import matplotlib
matplotlib.use("MacOSX") #put here explicitly for reference

from numpy import arange, sin, pi
import matplotlib.pyplot as plt

figure = plt.figure()
axes = figure.add_subplot(111)
t = arange(0.0, 3.0, 0.01)
s = sin(2 * pi * t)
axes.plot(t, s)

plt.show()

screenshot_using_macosx_backend

Plotting using the WXAgg backend (embed inside WX.Panel):

from numpy import arange, sin, pi
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 CanvasPanel(wx.Panel):
    def __init__(self, parent):
        wx.Panel.__init__(self, parent)
        self.figure = Figure()
        self.axes = self.figure.add_subplot(111)
        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()

    def draw(self):
        t = arange(0.0, 3.0, 0.01)
        s = sin(2 * pi * t)
        self.axes.plot(t, s)

if __name__ == "__main__":
    app = wx.App()
    fr = wx.Frame(None, title='test')
    panel = CanvasPanel(fr)
    panel.draw()
    fr.Show()
    app.MainLoop()

screenshot_wx_embed

Any workarounds or tips?

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