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"""
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 = [
(r'$\sin(2 \pi x)$' , lambda x: sin(2*pi*x)),
(r'$\frac{4}{3}\pi x^3$' , lambda x: (4.0 / 3.0) * pi * x**3),
(r'$\cos(2 \pi x)$' , lambda x: cos(2*pi*x)),
(r'$\log(x)$' , lambda x: log(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.figure = Figure()
self.axes = self.figure.add_subplot(111)
self.change_plot(0)
self.canvas = FigureCanvas(self, -1, self.figure)
self.sizer = wx.BoxSizer(wx.VERTICAL)
self.add_buttonbar()
self.sizer.Add(self.canvas, 1, wx.LEFT | wx.TOP | wx.GROW)
self.add_toolbar() # comment this out for no toolbar
menuBar = wx.MenuBar()
# File Menu
menu = wx.Menu()
menu.Append(wx.ID_EXIT, "E&xit\tAlt-X", "Exit this simple sample")
menuBar.Append(menu, "&File")
if IS_GTK or IS_WIN:
# Equation Menu
menu = wx.Menu()
for i, (mt, func) in enumerate(functions):
bm = mathtext_to_wxbitmap(mt)
item = wx.MenuItem(menu, 1000 + i, "")
item.SetBitmap(bm)
menu.AppendItem(item)
self.Bind(wx.EVT_MENU, self.OnChangePlot, item)
menuBar.Append(menu, "&Functions")
self.SetMenuBar(menuBar)
self.SetSizer(self.sizer)
self.Fit()
def add_buttonbar(self):
self.button_bar = wx.Panel(self)
self.button_bar_sizer = wx.BoxSizer(wx.HORIZONTAL)
self.sizer.Add(self.button_bar, 0, wx.LEFT | wx.TOP | wx.GROW)
for i, (mt, func) in enumerate(functions):
bm = mathtext_to_wxbitmap(mt)
button = wx.BitmapButton(self.button_bar, 1000 + i, bm)
self.button_bar_sizer.Add(button, 1, wx.GROW)
self.Bind(wx.EVT_BUTTON, self.OnChangePlot, button)
self.button_bar.SetSizer(self.button_bar_sizer)
def add_toolbar(self):
"""Copied verbatim from embedding_wx2.py"""
self.toolbar = NavigationToolbar2Wx(self.canvas)
self.toolbar.Realize()
if IS_MAC:
self.SetToolBar(self.toolbar)
else:
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)
self.toolbar.update()
def OnPaint(self, event):
self.canvas.draw()
def OnChangePlot(self, event):
self.change_plot(event.GetId() - 1000)
def change_plot(self, plot_number):
t = arange(1.0,3.0,0.01)
s = functions[plot_number][1](t)
self.axes.clear()
self.axes.plot(t, s)
self.Refresh()
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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