Benjamin,
I don't mind doing classes to store the state, but isn't a Patch already a
class?
Do you know of an example online that I can work off?
Thanks for your suggestions,
Mark
On Wed, Apr 23, 2014 at 5:12 PM, Benjamin Root <ben.r...@ou.edu> wrote:
> I think it is because the figure may or may not have some things drawn by
> the time the blitting starts. This is due to draw_idle(). So, it is trying
> to capture whatever is in the figure's canvas, but drawing may or may not
> have happened yet.
>
> Try this:
>
> def animate(i):
> if not animate.patch:
> animate.patch = plt.Circle((5, -5), 0.75, fc='y')
> animate.ax.add_patch(animate.patch)
> x, y = animate.patch.center
>
> x = 5 + 3 * np.sin(np.radians(i))
> y = 5 + 3 * np.cos(np.radians(i))
> animate.patch.center = (x, y)
> return animate.patch,
> animate.ax = ax
> animate.patch = None
>
> If you have something more complicated, then just go full bore and use
> classes to store the state.
>
> Cheers!
> Ben Root
>
>
>
> On Wed, Apr 23, 2014 at 10:51 AM, Raymond Smith <smit...@mit.edu> wrote:
>
>> This is pretty weird. If instead of Mark's original script, if I move the
>> add_patch out of init and have the init simply return an empty tuple, it
>> _mostly_ works as expected. But -- at least on my computer -- on some runs,
>> it has the moving circle, but also leaves a circle at the "top", starting
>> point, whereas on other runs it simply has the desired moving circle with
>> no 'background' circle. Usually, it will happen at least once if I start
>> the animation script 10 times. So still, the init function is a bit of a
>> mystery to me.
>>
>>
>> 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')
>> ax.add_patch(patch)
>>
>> def init():
>> return tuple()
>>
>>
>> def animate(i):
>> x, y = patch.center
>> patch.set_facecolor('y')
>> patch.set_edgecolor('k')
>>
>> 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()
>>
>>
>>
>>
>> On Wed, Apr 23, 2014 at 10:29 AM, Benjamin Root <ben.r...@ou.edu> wrote:
>>
>>> 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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