Working off of very faded memory, try not to return any objects in your
init function that you intend to be animated. If I remember correctly, when
blitting is True, the animator treats any object returned by the init()
function as background objects, and any objects returned by the animation
function as blittable. Since your patch is returned in both functions, I
think it is getting confused.
Again, very rusty memory here...
Ben Root
On Wed, Apr 23, 2014 at 9:34 AM, Raymond Smith <smit...@mit.edu> wrote:
> Hi Mark,
>
> I can't say this is the 'proper' solution or the correct interpretation,
> but it should work.
>
> I think when blitting that the init function serves as a something of a
> "background" for the rest of the animation. So try changing
>
>
> def init():
> *patch.center = (5, 5)*
> ax.add_patch(patch)
> return patch,
>
> to
>
> def init():
> *patch.center = (5, -5)*
> ax.add_patch(patch)
> return patch,
>
> Cheers,
> Ray
>
>
> On Wed, Apr 23, 2014 at 5:44 AM, Mark Bakker <mark...@gmail.com> wrote:
>
>> Hello list,
>>
>> I am trying to animate a patch. The animation should show a circle
>> orbiting around a point. I took the code from
>> http://nickcharlton.net/posts/drawing-animating-shapes-matplotlib.html
>>
>> Problem is that when I run the code, the animation doesn't remove the
>> initial position of the circle (blit is True) while it works correctly on
>> the website referenced above.
>>
>> Does anybody else see this behavior? Here's the code:
>>
>> import numpy as np
>> from matplotlib import pyplot as plt
>> from matplotlib import animation
>>
>> fig = plt.figure()
>> fig.set_dpi(100)
>> fig.set_size_inches(7, 6.5)
>>
>> ax = plt.axes(xlim=(0, 10), ylim=(0, 10))
>> patch = plt.Circle((5, -5), 0.75, fc='y')
>>
>> def init():
>> patch.center = (5, 5)
>> ax.add_patch(patch)
>> return patch,
>>
>> def animate(i):
>> x, y = patch.center
>> x = 5 + 3 * np.sin(np.radians(i))
>> y = 5 + 3 * np.cos(np.radians(i))
>> patch.center = (x, y)
>> return patch,
>>
>> anim = animation.FuncAnimation(fig, animate,
>> init_func=init,
>> frames=360,
>> interval=20,
>> blit=True)
>>
>> plt.show()
>>
>> Thanks, Mark
>>
>>
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