how to show the cursor coordinates in wxPython when using wx.SplitterWindow - matplotlib

Question

I'm trying to do something similar to that shown in this link to draw a cursor and report the data coordinates in the status bar. However, my code is a little bit different since I need to use wx.SplitterWindow to separate buttons and plots. Basically, in the main frame module I create the status bar, but the plot is generated in a separated module. See below my current code:
from matplotlib.figure import Figure
from matplotlib.backends.backend_wxagg import \
FigureCanvasWxAgg as FigCanvas, \
NavigationToolbar2WxAgg as NavigationToolbar, \
wxc as wxc
import pylab
import wx
from numpy import arange, sin, pi
class data:
def __init__(self):
self.t = []
self.s = []
class Plot_Panel(wx.Panel):
def __init__(self, parent):
wx.Panel.__init__(self, parent)
# create some sizers
mainSizer = wx.BoxSizer(wx.VERTICAL)
checkSizer = wx.BoxSizer(wx.HORIZONTAL)
# create figrue
self.fig = Figure()
self.canvas = FigCanvas(self, -1, self.fig)
self.axes = self.fig.add_subplot(111)
# create the widgets
self.toggleMarker = wx.CheckBox(self, label="Show Marker")
# layout the widgets
mainSizer.Add(self.canvas, 1, wx.EXPAND)
checkSizer.Add(self.toggleMarker, 0, wx.ALL, 5)
mainSizer.Add(checkSizer)
self.SetSizer(mainSizer)
def draw_plot(self, data):
# Clear the previous figure
self.fig.clear()
# Redraw figure
self.axes = self.fig.add_subplot(111)
# Define data to plot
self.plot_data= self.axes.plot(data.t, data.s, linewidth=3, color='y',)[0]
# Draw Cursor or not
if self.toggleMarker.IsChecked():
# Note that event is a MplEvent
self.canvas.mpl_connect('motion_notify_event', self.UpdateStatusBar)
self.canvas.Bind(wx.EVT_ENTER_WINDOW, self.ChangeCursor)
self.canvas.draw()
def ChangeCursor(self, event):
self.canvas.SetCursor(wxc.StockCursor(wx.CURSOR_BULLSEYE))
def UpdateStatusBar(self, event):
if event.inaxes:
x, y = event.xdata, event.ydata
# self.statusBar.SetStatusText(("x= "+str(Pos.x)+" y="+str(Pos.y)))
class Button_Panel(wx.Panel):
def __init__(self, parent):
wx.Panel.__init__(self, parent)
# create the widgets
self.toggleStart = wx.Button(self, id=wx.ID_ANY, label="Plot data")
class ProportionalSplitter(wx.SplitterWindow):
def __init__(self,parent, id = -1, proportion=0.66, size = wx.DefaultSize, **kwargs):
wx.SplitterWindow.__init__(self,parent,id,wx.Point(0, 0),size, **kwargs)
self.SetMinimumPaneSize(50) #the minimum size of a pane.
self.proportion = proportion
if not 0 < self.proportion < 1:
raise ValueError, "proportion value for ProportionalSplitter must be between 0 and 1."
self.ResetSash()
self.Bind(wx.EVT_SIZE, self.OnReSize)
self.Bind(wx.EVT_SPLITTER_SASH_POS_CHANGED, self.OnSashChanged, id=id)
self.Bind(wx.EVT_PAINT, self.OnPaint)
self.firstpaint = True
def SplitHorizontally(self, win1, win2):
if self.GetParent() is None: return False
return wx.SplitterWindow.SplitHorizontally(self, win1, win2,
int(round(self.GetParent().GetSize().GetHeight() * self.proportion)))
def SplitVertically(self, win1, win2):
if self.GetParent() is None: return False
return wx.SplitterWindow.SplitVertically(self, win1, win2,
int(round(self.GetParent().GetSize().GetWidth() * self.proportion)))
def GetExpectedSashPosition(self):
if self.GetSplitMode() == wx.SPLIT_HORIZONTAL:
tot = max(self.GetMinimumPaneSize(),self.GetParent().GetClientSize().height)
else:
tot = max(self.GetMinimumPaneSize(),self.GetParent().GetClientSize().width)
return int(round(tot * self.proportion))
def ResetSash(self):
self.SetSashPosition(self.GetExpectedSashPosition())
def OnReSize(self, event):
"Window has been resized, so we need to adjust the sash based on self.proportion."
self.ResetSash()
event.Skip()
def OnSashChanged(self, event):
"We'll change self.proportion now based on where user dragged the sash."
pos = float(self.GetSashPosition())
if self.GetSplitMode() == wx.SPLIT_HORIZONTAL:
tot = max(self.GetMinimumPaneSize(),self.GetParent().GetClientSize().height)
else:
tot = max(self.GetMinimumPaneSize(),self.GetParent().GetClientSize().width)
self.proportion = pos / tot
event.Skip()
def OnPaint(self, event):
if self.firstpaint:
if self.GetSashPosition() != self.GetExpectedSashPosition():
self.ResetSash()
self.firstpaint = False
event.Skip()
class Main_Window(wx.Frame):
def __init__(self, parent, title):
wx.Frame.__init__(self, parent, title = title)
# Create a StatusBar at the bottom of the window
self.statusBar = wx.StatusBar(self, -1)
self.SetStatusBar(self.statusBar)
# Set plot panel
self.splitter = ProportionalSplitter(self,-1, 0.85)
self.ppanel = Plot_Panel(self.splitter)
self.ppanel.SetBackgroundColour('#ffffff')
# Set button panel
self.bpanel = Button_Panel(self.splitter)
# Set frame
self.splitter.SplitVertically(self.ppanel, self.bpanel)
self.Show(True)
self.Maximize(True)
# bind the widgets
self.ppanel.toggleMarker.Bind(wx.EVT_CHECKBOX, self.onToggleMarker)
self.bpanel.toggleStart.Bind(wx.EVT_BUTTON, self.onToggleStart)
# Set classes
self.data = data()
def onToggleMarker(self, event):
self.ppanel.draw_plot(self.data)
def onToggleStart(self, event):
self.data.t = arange(0.0, 1.0, 0.01)
self.data.s = sin(2*2*pi*self.data.t)
# plot data
self.ppanel.draw_plot(self.data)
def main():
app = wx.App(False)
frame = Main_Window(None, "GUI")
frame.Show()
app.MainLoop()
if __name__ == "__main__" :
main()
The plot is shown when the button "Plot data" is pressed. What I would like to do is to show the x and y position in the status bar when the checkbox "Show Marker" is checked (in a similar way as it is done in the code posted in the link), and stop when it is unchecked. But I'm not sure if it is possible to do it in my code due to having the definitions of the status bar and the plot in different modules. Any hint will be welcome.

Answer 1

What a joy to get a full, working example program with the question.
You just need to pass the base module as a parameter to self.ppanel
i.e.
self.ppanel = Plot_Panel(self.splitter, self)
then refer to that when updating the status bar, see below for references to base
from matplotlib.figure import Figure
from matplotlib.backends.backend_wxagg import \
FigureCanvasWxAgg as FigCanvas, \
NavigationToolbar2WxAgg as NavigationToolbar, \
wxc as wxc
import pylab
import wx
from numpy import arange, sin, pi
class data:
def __init__(self):
self.t = []
self.s = []
class Plot_Panel(wx.Panel):
def __init__(self, parent, base):
wx.Panel.__init__(self, parent)
self.base = base
# create some sizers
mainSizer = wx.BoxSizer(wx.VERTICAL)
checkSizer = wx.BoxSizer(wx.HORIZONTAL)
# create figrue
self.fig = Figure()
self.canvas = FigCanvas(self, -1, self.fig)
self.axes = self.fig.add_subplot(111)
# create the widgets
self.toggleMarker = wx.CheckBox(self, label="Show Marker")
# layout the widgets
mainSizer.Add(self.canvas, 1, wx.EXPAND)
checkSizer.Add(self.toggleMarker, 0, wx.ALL, 5)
mainSizer.Add(checkSizer)
self.SetSizer(mainSizer)
def draw_plot(self, data):
# Clear the previous figure
self.fig.clear()
# Redraw figure
self.axes = self.fig.add_subplot(111)
# Define data to plot
self.plot_data= self.axes.plot(data.t, data.s, linewidth=3, color='y',)[0]
# Draw Cursor or not
if self.toggleMarker.IsChecked():
# Note that event is a MplEvent
self.canvas.mpl_connect('motion_notify_event', self.UpdateStatusBar)
self.canvas.Bind(wx.EVT_ENTER_WINDOW, self.ChangeCursor)
self.canvas.draw()
def ChangeCursor(self, event):
self.canvas.SetCursor(wxc.StockCursor(wx.CURSOR_BULLSEYE))
def UpdateStatusBar(self, event):
if event.inaxes:
x, y = event.xdata, event.ydata
self.base.statusBar.SetStatusText(("x= "+str(x)+" y="+str(y)))
class Button_Panel(wx.Panel):
def __init__(self, parent):
wx.Panel.__init__(self, parent)
# create the widgets
self.toggleStart = wx.Button(self, id=wx.ID_ANY, label="Plot data")
class ProportionalSplitter(wx.SplitterWindow):
def __init__(self,parent, id = -1, proportion=0.66, size = wx.DefaultSize, **kwargs):
wx.SplitterWindow.__init__(self,parent,id,wx.Point(0, 0),size, **kwargs)
self.SetMinimumPaneSize(50) #the minimum size of a pane.
self.proportion = proportion
if not 0 < self.proportion < 1:
raise ValueError, "proportion value for ProportionalSplitter must be between 0 and 1."
self.ResetSash()
self.Bind(wx.EVT_SIZE, self.OnReSize)
self.Bind(wx.EVT_SPLITTER_SASH_POS_CHANGED, self.OnSashChanged, id=id)
self.Bind(wx.EVT_PAINT, self.OnPaint)
self.firstpaint = True
def SplitHorizontally(self, win1, win2):
if self.GetParent() is None: return False
return wx.SplitterWindow.SplitHorizontally(self, win1, win2,
int(round(self.GetParent().GetSize().GetHeight() * self.proportion)))
def SplitVertically(self, win1, win2):
if self.GetParent() is None: return False
return wx.SplitterWindow.SplitVertically(self, win1, win2,
int(round(self.GetParent().GetSize().GetWidth() * self.proportion)))
def GetExpectedSashPosition(self):
if self.GetSplitMode() == wx.SPLIT_HORIZONTAL:
tot = max(self.GetMinimumPaneSize(),self.GetParent().GetClientSize().height)
else:
tot = max(self.GetMinimumPaneSize(),self.GetParent().GetClientSize().width)
return int(round(tot * self.proportion))
def ResetSash(self):
self.SetSashPosition(self.GetExpectedSashPosition())
def OnReSize(self, event):
"Window has been resized, so we need to adjust the sash based on self.proportion."
self.ResetSash()
event.Skip()
def OnSashChanged(self, event):
"We'll change self.proportion now based on where user dragged the sash."
pos = float(self.GetSashPosition())
if self.GetSplitMode() == wx.SPLIT_HORIZONTAL:
tot = max(self.GetMinimumPaneSize(),self.GetParent().GetClientSize().height)
else:
tot = max(self.GetMinimumPaneSize(),self.GetParent().GetClientSize().width)
self.proportion = pos / tot
event.Skip()
def OnPaint(self, event):
if self.firstpaint:
if self.GetSashPosition() != self.GetExpectedSashPosition():
self.ResetSash()
self.firstpaint = False
event.Skip()
class Main_Window(wx.Frame):
def __init__(self, parent, title):
wx.Frame.__init__(self, parent, title = title)
# Create a StatusBar at the bottom of the window
self.statusBar = wx.StatusBar(self, -1)
self.SetStatusBar(self.statusBar)
# Set plot panel
self.splitter = ProportionalSplitter(self,-1, 0.85)
self.ppanel = Plot_Panel(self.splitter, self)
self.ppanel.SetBackgroundColour('#ffffff')
# Set button panel
self.bpanel = Button_Panel(self.splitter)
# Set frame
self.splitter.SplitVertically(self.ppanel, self.bpanel)
self.Show(True)
self.Maximize(True)
# bind the widgets
self.ppanel.toggleMarker.Bind(wx.EVT_CHECKBOX, self.onToggleMarker)
self.bpanel.toggleStart.Bind(wx.EVT_BUTTON, self.onToggleStart)
# Set classes
self.data = data()
def onToggleMarker(self, event):
self.ppanel.draw_plot(self.data)
def onToggleStart(self, event):
self.data.t = arange(0.0, 1.0, 0.01)
self.data.s = sin(2*2*pi*self.data.t)
# plot data
self.ppanel.draw_plot(self.data)
def main():
app = wx.App(False)
frame = Main_Window(None, "GUI")
frame.Show()
app.MainLoop()
if __name__ == "__main__" :
main()