Line2D and wx Backend

Community matplotlib-users
1

Hi - I'm having problems - I don't get any line

    > displayed on my screen. My code looks as follows
    > (Init):

Make sure you are working with the line you think you are

Rather than doing this

        self.axes.add_line(Line2D(,)

do this
        self.line = Line2D(,
        self.axes.add_line(self.line)

After you do this

            line = self.data[source][0] # Retreive the line

check to make sure that id(line) and id(self.line) are the same.

Here is a simple example that binds events to adding line data.
Perhaps you can follow this (in wx you need to click on the figure
once before the keypress events will be processed)

from matplotlib.lines import Line2D
import matplotlib.numerix as nx
from pylab import figure, show

xdata =
ydata =
line = Line2D(xdata, ydata)

def add_data(event):
    if event.key!='a': return
    xdata.extend(nx.mlab.rand(10))
    ydata.extend(nx.mlab.rand(10))
    line.set_data(xdata, ydata)
    fig.canvas.draw()
    
fig = figure()
ax = fig.add_subplot(111)
ax.add_line(line)
ax.set_title("Press 'a' to add more data")
fig.canvas.mpl_connect('key_press_event', add_data)

show()

2

Yes - this code works at home and at work (Linux/windows). I fail to see why
mine won't. I checked the id's - they're correct

···

-----Ursprüngliche Nachricht-----
Von: John Hunter [mailto:jdhunter@…4…]
Gesendet: Donnerstag, 25. August 2005 18:01
An: Schindler Benjamin
Cc: matplotlib-users@lists.sourceforge.net
Betreff: Re: [Matplotlib-users] Line2D and wx Backend

    > Hi - I'm having problems - I don't get any line
    > displayed on my screen. My code looks as follows
    > (Init):

Make sure you are working with the line you think you are

Rather than doing this

        self.axes.add_line(Line2D([],[])

do this
        self.line = Line2D([],[]
        self.axes.add_line(self.line)

After you do this

            line = self.data[source][0] # Retreive the line

check to make sure that id(line) and id(self.line) are the same.

Here is a simple example that binds events to adding line data.
Perhaps you can follow this (in wx you need to click on the figure
once before the keypress events will be processed)

from matplotlib.lines import Line2D
import matplotlib.numerix as nx
from pylab import figure, show

xdata = []
ydata = []
line = Line2D(xdata, ydata)

def add_data(event):
    if event.key!='a': return
    xdata.extend(nx.mlab.rand(10))
    ydata.extend(nx.mlab.rand(10))
    line.set_data(xdata, ydata)
    fig.canvas.draw()
    
fig = figure()
ax = fig.add_subplot(111)
ax.add_line(line)
ax.set_title("Press 'a' to add more data")
fig.canvas.mpl_connect('key_press_event', add_data)

show()