Using iPython and matplotlib, I want to be able to add an annotation (or any object), remove it from the graph, and then re-add it. Essentially I want to toggle the appearance of the object in the graph.
Here is how I am adding and removing this object. The object still exists after the remove(). But I can't figure out how to make it reappear in the graph.
an = ax.annotate('TEST', xy=(x, y), xytext=(x + 15, y), arrowprops=dict(facecolor='#404040'))
draw()
an.remove()
You want set_visible (doc)
an = gca().annotate('TEST', xy=(.1, .1), xytext=(.1 + 15,.1), arrowprops=dict(facecolor='#404040'))
gca().set_xlim([0, 30])
draw()
plt.pause(5)
an.set_visible(False)
draw()
plt.pause(5)
an.set_visible(True)
draw()
A snippet from an.remove() help goes: "The effect will not be visible until the figure is redrawn". If you do this:
import numpy as np
import matplotlib.pyplot as plt
fig = plt.figure('A figure title')
ax = fig.add_subplot(111, autoscale_on=False, xlim=(-1,5), ylim=(-3,5))
t = np.arange(0.0, 5.0, 0.01)
s = np.cos(2*np.pi*t)
line, = ax.plot(t, s, lw=3, color='purple')
ann=ax.annotate('offset', xy=(1, 1), xycoords='data',xytext=(-15, 10), textcoords='offset points',arrowprops=dict(facecolor='black', shrink=0.05),horizontalalignment='right', verticalalignment='bottom')
It will draw a figure with an annotation. To remove it all you need to do is:
ann.remove()
fig.canvas.draw()
so all you're missing is redrawing the figure.
