Hi all.
I'm using matplotlib to draw some graph in a pyqt application.
Is there a way to show infos only when the mouse hover the plot nodes?
At the moment I'm stuck using this (ugly, and conceptually wrong) piece of
code, written by me...
basically I add hidden annotations where I need, then (ab)use the
fig.canvas.mpl_connect function with the 'motion_notify_event' option.
Is there a "motion_mouse_enter_plot" / "motion_mouse_exit_plot" or something
similar? I see there is the "pick_event" interface, but I don't want to
show infos "on click", but "on hovering"
#!/usr/bin/env python
class show_annotation(object):
def __init__(self, annotations):
'''"fake" class, mostly a "function with memory"'''
self.annotations = annotations
def __call__(self, mouse_event):
ax = mouse_event.inaxes
if not ax:
return
line = ax.get_lines()[0]
contained, infos = line.contains(mouse_event)
if not contained: # eventually exited
for annotation in self.annotations.values():
annotation.set_visible(False)
else:
xdata, ydata = line.get_data()
ind = infos['ind'][0]
annotation = self.annotations[xdata[ind], ydata[ind]]
if not annotation.get_visible(): # is entered
annotation.set_visible(True)
ax.figure.canvas.draw()
if __name__ == '__main__':
from random import randint
x = range(10)
y = [ randint(0, i) for i in x ]
labels = [ 'label_%d' % i for i in x ]
from matplotlib import pyplot
fig = pyplot.figure()
ax = fig.add_subplot(1, 1, 1)
ax.plot(x, y)
# waiting for a "dict comprehension" sintax
annotations = {}
for label, xe, ye in zip(labels, x, y):
annotations[xe,ye] = ax.annotate(label, (xe,ye), visible=False)
fig.canvas.mpl_connect('motion_notify_event',
show_annotation(annotations))
pyplot.show()
--
By ZeD
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