I am using Python 2.7 and Matplotlib 1.0.0 and I am having problems getting
events triggering in this example below. I have taken the draggable
rectangle example (with blit) code from the event handling documentation (
http://matplotlib.sourceforge.net/users/event_handling.html) and tried to
put it in a wxPython frame. The problem I have is that I can't get any
events to register. When I click in the figure nothing happens, the
on_press section in the code is never reached.
Any suggestions how I can make this work?
I have a vague recollection of this working in matplotlib < 1.0.0 and python
< 2.7, but I am not 100% sure as it was a long time ago I last worked with
matplotlib.
The code:
import numpy as np
import wx
from matplotlib.figure import Figure
from matplotlib.backends.backend_wxagg import FigureCanvasWxAgg as
FigureCanvas
class DraggableRectangle:
lock = None # only one can be animated at a time
def __init__(self, rect):
self.rect = rect
self.press = None
self.background = None
def connect(self):
'connect to all the events we need'
self.cidpress = self.rect.figure.canvas.mpl_connect('button_press_event',
self.on_press)
self.cidrelease =
self.rect.figure.canvas.mpl_connect('button_release_event', self.on_release)
self.cidmotion = self.rect.figure.canvas.mpl_connect('motion_notify_event',
self.on_motion)
def on_press(self, event):
'on button press we will see if the mouse is over us and store some data'
if event.inaxes != self.rect.axes: return
if DraggableRectangle.lock is not None: return
contains, attrd = self.rect.contains(event)
if not contains: return
print 'event contains', self.rect.xy
x0, y0 = self.rect.xy
self.press = x0, y0, event.xdata, event.ydata
DraggableRectangle.lock = self
# draw everything but the selected rectangle and store the pixel buffer
canvas = self.rect.figure.canvas
axes = self.rect.axes
self.rect.set_animated(True)
canvas.draw()
self.background = canvas.copy_from_bbox(self.rect.axes.bbox)
# now redraw just the rectangle
axes.draw_artist(self.rect)
# and blit just the redrawn area
canvas.blit(axes.bbox)
def on_motion(self, event):
'on motion we will move the rect if the mouse is over us'
if DraggableRectangle.lock is not self:
return
if event.inaxes != self.rect.axes: return
x0, y0, xpress, ypress = self.press
dx = event.xdata - xpress
dy = event.ydata - ypress
self.rect.set_x(x0+dx)
self.rect.set_y(y0+dy)
canvas = self.rect.figure.canvas
axes = self.rect.axes
# restore the background region
canvas.restore_region(self.background)
# redraw just the current rectangle
axes.draw_artist(self.rect)
# blit just the redrawn area
canvas.blit(axes.bbox)
def on_release(self, event):
'on release we reset the press data'
if DraggableRectangle.lock is not self:
return
self.press = None
DraggableRectangle.lock = None
# turn off the rect animation property and reset the background
self.rect.set_animated(False)
self.background = None
# redraw the full figure
self.rect.figure.canvas.draw()
def disconnect(self):
'disconnect all the stored connection ids'
self.rect.figure.canvas.mpl_disconnect(self.cidpress)
self.rect.figure.canvas.mpl_disconnect(self.cidrelease)
self.rect.figure.canvas.mpl_disconnect(self.cidmotion)
class TestFrame(wx.Frame):
def __init__(self):
wx.Frame.__init__(self, None, title="Event Test", size=(640,480))
panel = wx.Panel(self,-1)
fig = Figure()
canvas = FigureCanvas(panel, -1, fig)
ax = fig.add_subplot(111)
rects = ax.bar(range(10), 20*np.random.rand(10))
drs = []
for rect in rects:
dr = DraggableRectangle(rect)
dr.connect()
drs.append(dr)
fig.canvas.draw()
if __name__ == "__main__":
app = wx.App()
theFrame = TestFrame()
theFrame.Show()
app.MainLoop()
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