I am trying to make an animation of an expanding circle using FuncAnimation and circle.set_radius(). However, the animation only works when blit = False. The code is as follow:
import numpy as np
import matplotlib.pyplot as plt
from matplotlib import animation
fig, ax = plt.subplots()
plt.grid(True)
plt.axis([-0.6, 0.6, -0.6, 0.6])
circle1= plt.Circle([0,0],0.01,color="0.",fill=False, clip_on = True)
ax.add_patch(circle1)
dt = 1.0/20
vel = 0.1
def init():
circle1.set_radius(0.01)
def animate(i):
global dt, vel
r = vel * i * dt
circle1.set_radius(r)
return circle1,
anim = animation.FuncAnimation(fig, animate, init_func=init,
frames=200, interval= 50, blit=True)
It returns this error:
Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/matplotlib/artist.py", line 61, in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File "/usr/local/lib/python2.7/site-packages/matplotlib/figure.py", line 1139, in draw
self.canvas.draw_event(renderer)
File "/usr/local/lib/python2.7/site-packages/matplotlib/backend_bases.py", line 1809, in draw_event
self.callbacks.process(s, event)
File "/usr/local/lib/python2.7/site-packages/matplotlib/cbook.py", line 562, in process
proxy(*args, **kwargs)
File "/usr/local/lib/python2.7/site-packages/matplotlib/cbook.py", line 429, in __call__
return mtd(*args, **kwargs)
File "/usr/local/lib/python2.7/site-packages/matplotlib/animation.py", line 620, in _start
self._init_draw()
File "/usr/local/lib/python2.7/site-packages/matplotlib/animation.py", line 1166, in _init_draw
for a in self._drawn_artists:
TypeError: 'NoneType' object is not utterable
I am using mac OS. The animation will work when I changed blit = False. However, whenever I move my mouse there animation slow down. This is problematic because I have a separate thread generating the sound output. In practice, the circle will hit some data points and make sound. As a result they are not in sync. Please help.
From the docs,
If blit=True, func and init_func should return an iterable of drawables to clear.
Therefore - you need to add return circle1, to your function init(). The other option is not to specify an init_func at all in your call to FuncAnimation - you may not need it. The animations probably does what you want without it.
NOTE the trailing comma after circle1 - this means a (1 element) tuple is returned, so that the return value is iterable as required. You already have this in the animate function.
Related
I have a matplotlib plot with a slider and am interested in setting the colors of the points plotted as the slider gets dragged one way or the other. I know you can set the colors of points with set_array() but so far have had luck passing set_array() only 1D arrays of floats. When I pass set_array() an array of strings corresponding to matplotlib colors, I receive the error and traceback below.
Here are some relevant code snippets, with dummy info. for ease of assessment. With the two commented-out lines in update(val), the error below appears. Un-commenting them, so that set_array() gets a float, fixes the issue, but then I lose ability to control the colors with any precision. (For instance, changing 'g' to 'c' makes no perceptible difference in the colors.)
import numpy as np
import matplotlib
matplotlib.use('TkAgg')
import matplotlib.pyplot as plt
from matplotlib.widgets import Slider
import matplotlib.colors as c
x = np.linspace(1, 100, 100)
y = x**2
fig, ax = plt.subplots()
plt.subplots_adjust(left=0.1, bottom=0.20)
plt.ylim([y.min(), y.max()])
plt.xlim([0, 100])
init = 4
scat = ax.scatter(x[:init], y[:init], s=5, c=['k']*init)
ax_slider = plt.axes([0.15, 0.05, 0.65, 0.03])
slider = Slider(ax_slider, 'Day', 0, 100, valinit=init, valfmt="%i")
# Update function, called upon slider movement
def update(val):
val = int(val)
colors_new = np.array(['k']*val, dtype=object)
colors_new[::2] = 'g'
colors_new[1::2] = 'm'
# colors_new = map(lambda x: c.to_rgb(x), colors_new)
# colors_new = np.dot(colors_new, [0.2989, 0.5870, 0.1140])
scat.set_array(colors_new)
xx = np.vstack((x[:val], y[:val]))
scat.set_offsets(xx.T)
# Call update function on slider value change
slider.on_changed(update)
plt.show()
Traceback:
Exception in Tkinter callback
Traceback (most recent call last):
File "/usr/local/Cellar/python/2.7.6_1/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk/Tkinter.py", line 1470, in __call__
return self.func(*args)
File "/usr/local/Cellar/python/2.7.6_1/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk/Tkinter.py", line 531, in callit
func(*args)
File "/Users/johnsmith/PycharmProjects/LawSchoolData/venv/lib/python2.7/site-packages/matplotlib/backends/_backend_tk.py", line 310, in idle_draw
self.draw()
File "/Users/johnsmith/PycharmProjects/LawSchoolData/venv/lib/python2.7/site-packages/matplotlib/backends/backend_tkagg.py", line 12, in draw
super(FigureCanvasTkAgg, self).draw()
File "/Users/johnsmith/PycharmProjects/LawSchoolData/venv/lib/python2.7/site-packages/matplotlib/backends/backend_agg.py", line 437, in draw
self.figure.draw(self.renderer)
File "/Users/johnsmith/PycharmProjects/LawSchoolData/venv/lib/python2.7/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
return draw(artist, renderer, *args, **kwargs)
File "/Users/johnsmith/PycharmProjects/LawSchoolData/venv/lib/python2.7/site-packages/matplotlib/figure.py", line 1493, in draw
renderer, self, artists, self.suppressComposite)
File "/Users/johnsmith/PycharmProjects/LawSchoolData/venv/lib/python2.7/site-packages/matplotlib/image.py", line 141, in _draw_list_compositing_images
a.draw(renderer)
File "/Users/johnsmith/PycharmProjects/LawSchoolData/venv/lib/python2.7/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
return draw(artist, renderer, *args, **kwargs)
File "/Users/johnsmith/PycharmProjects/LawSchoolData/venv/lib/python2.7/site-packages/matplotlib/axes/_base.py", line 2635, in draw
mimage._draw_list_compositing_images(renderer, self, artists)
File "/Users/johnsmith/PycharmProjects/LawSchoolData/venv/lib/python2.7/site-packages/matplotlib/image.py", line 141, in _draw_list_compositing_images
a.draw(renderer)
File "/Users/johnsmith/PycharmProjects/LawSchoolData/venv/lib/python2.7/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
return draw(artist, renderer, *args, **kwargs)
File "/Users/johnsmith/PycharmProjects/LawSchoolData/venv/lib/python2.7/site-packages/matplotlib/collections.py", line 911, in draw
Collection.draw(self, renderer)
File "/Users/johnsmith/PycharmProjects/LawSchoolData/venv/lib/python2.7/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
return draw(artist, renderer, *args, **kwargs)
File "/Users/johnsmith/PycharmProjects/LawSchoolData/venv/lib/python2.7/site-packages/matplotlib/collections.py", line 264, in draw
self.update_scalarmappable()
File "/Users/johnsmith/PycharmProjects/LawSchoolData/venv/lib/python2.7/site-packages/matplotlib/collections.py", line 808, in update_scalarmappable
self._facecolors = self.to_rgba(self._A, self._alpha)
File "/Users/johnsmith/PycharmProjects/LawSchoolData/venv/lib/python2.7/site-packages/matplotlib/cm.py", line 274, in to_rgba
x = self.norm(x)
File "/Users/johnsmith/PycharmProjects/LawSchoolData/venv/lib/python2.7/site-packages/matplotlib/colors.py", line 943, in __call__
self.autoscale_None(result)
File "/Users/johnsmith/PycharmProjects/LawSchoolData/venv/lib/python2.7/site-packages/matplotlib/colors.py", line 994, in autoscale_None
self.vmin = A.min()
File "/Users/johnsmith/PycharmProjects/LawSchoolData/venv/lib/python2.7/site-packages/numpy/ma/core.py", line 5602, in min
axis=axis, out=out, **kwargs).view(type(self))
AttributeError: 'str' object has no attribute 'view'
set_array() only works to set the color values when the color is defined by a colormap. You could create a custom ListedColormap and set the values numerically.
If you want to set the colors via color values, you can use set_facecolors():
import numpy as np
import matplotlib
matplotlib.use('TkAgg')
import matplotlib.pyplot as plt
from matplotlib.widgets import Slider
x = np.linspace(1, 100, 100)
y = x**2
fig, ax = plt.subplots()
plt.subplots_adjust(left=0.1, bottom=0.20)
plt.ylim([y.min(), y.max()])
plt.xlim([0, 100])
init = 4
scat = ax.scatter(x[:init], y[:init], s=5, c=['k']*init)
ax_slider = plt.axes([0.15, 0.05, 0.65, 0.03])
slider = Slider(ax_slider, 'Day', 0, 100, valinit=init, valfmt="%i")
# Update function, called upon slider movement
def update(val):
val = int(val)
colors_new = np.array(['k']*val, dtype=object)
colors_new[::2] = 'g'
colors_new[1::2] = 'm'
scat.set_facecolors(colors_new)
xx = np.vstack((x[:val], y[:val]))
scat.set_offsets(xx.T)
# Call update function on slider value change
slider.on_changed(update)
plt.show()
Here is an example working with a colormap:
colors = ['k', 'g', 'm']
cmap = ListedColormap(colors)
scat = ax.scatter(x[:init], y[:init], s=5, c=np.zeros(init), cmap=cmap, vmin=0, vmax=len(colors)-1)
#....
def update(val):
val = int(val)
colors_new = np.zeros(val)
colors_new[::2] = 1
colors_new[1::2] = 2
scat.set_array(colors_new)
#....
I am new to python so I understand that this may be a stupid question, but I am having issues animating this. I can't see what the error is. I get this error
TypeError: f() missing 1 required positional argument: '
I want to use matplotlib when animating, because I have not downloaded scitools.
Any help at all would be very much appriciated
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.animation as animation
from matplotlib import style
x = np.linspace(-6, 6)
tmax = 1
tmin = -1
t = np.linspace(-1, 1)
def f(x, t):
term = (np.exp(-1*(x-3*t)**2))*np.sin(3*np.pi*(x-t))
return term
max_f = f(x[-1], t[-1])
plt.ion()
y = f(x, tmax)
lines = plt.plot(x, y)
plt.axis([x[0], x[-1], -0.1, max_f])
plt.xlabel('x')
plt.ylabel('f')
counter = 0
for ts in t:
y = f(x, t)
lines[0].set_ydata(y)
plt.legend(['ts=%4.2f' % ts])
plt.draw()
plt.savefig('tmp_%04d.png' % counter)
counter += 1
fig = plt.figure()
anim = animation.FuncAnimation(fig, f, interval = 1000, blit=True)
fig = plt.figure()
plt.axis([x[0], x[-1], -0.1, max_f])
lines = plt.plot([], [])
plt.xlabel('x')
plt.ylabel('f')
plt.show()
EDIT, full traceback:
Exception in Tkinter callback
Traceback (most recent call last):
File "C:\Users\me\AppData\Local\Programs\Python\Python36-32\lib\tkinter__init__.py", line 1699, in call
return self.func(*args)
File "C:\Users\me\AppData\Local\Programs\Python\Python36-32\lib\tkinter__init__.py", line 745, in callit
func(*args)
File "C:\Users\me\AppData\Local\Programs\Python\Python36-32\lib\site-packages\matplotlib\backends\backend_tkagg.py", line 370, in idle_draw
self.draw()
File "C:\Users\me\AppData\Local\Programs\Python\Python36-32\lib\site-packages\matplotlib\backends\backend_tkagg.py", line 351, in draw
FigureCanvasAgg.draw(self)
File "C:\Users\me\AppData\Local\Programs\Python\Python36-32\lib\site-packages\matplotlib\backends\backend_agg.py", line 464, in draw
self.figure.draw(self.renderer)
File "C:\Users\me\AppData\Local\Programs\Python\Python36-32\lib\site-packages\matplotlib\artist.py", line 63, in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File "C:\Users\me\AppData\Local\Programs\Python\Python36-32\lib\site-packages\matplotlib\figure.py", line 1151, in draw
self.canvas.draw_event(renderer)
File "C:\Users\me\AppData\Local\Programs\Python\Python36-32\lib\site-packages\matplotlib\backend_bases.py", line 1823, in draw_event
self.callbacks.process(s, event)
File "C:\Users\me\AppData\Local\Programs\Python\Python36-32\lib\site-packages\matplotlib\cbook.py", line 554, in process
proxy(*args, **kwargs)
File "C:\Users\me\AppData\Local\Programs\Python\Python36-32\lib\site-packages\matplotlib\cbook.py", line 416, in call
return mtd(*args, **kwargs)
File "C:\Users\me\AppData\Local\Programs\Python\Python36-32\lib\site-packages\matplotlib\animation.py", line 881, in _start
self._init_draw()
File "C:\Users\me\AppData\Local\Programs\Python\Python36-32\lib\site-packages\matplotlib\animation.py", line 1540, in _init_draw
self._draw_frame(next(self.new_frame_seq()))
File "C:\Users\me\AppData\Local\Programs\Python\Python36-32\lib\site-packages\matplotlib\animation.py", line 1562, in _draw_frame
self._drawn_artists = self._func(framedata, *self._args)
TypeError: f() missing 1 required positional argument: 't'
As said, this is not really about the error, you can easily prevent that by supplying some value for t as fargs in FuncAnimation. However, this will not lead to the code producing an animation at all and hence as said, start with the exmaple add your functions and code step by step and see what happens.
This will eventually lead to something like the following:
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.animation as animation
x = np.linspace(-6, 6)
tmax = 1
tmin = -1
t = np.linspace(-1, 1)
def f(x, t):
term = (np.exp(-1*(x-3*t)**2))*np.sin(3*np.pi*(x-t))
return term
y = f(x, tmax)
lines = plt.plot(x, y)
plt.axis([x[0], x[-1], -1, 1])
plt.xlabel('x')
plt.ylabel('f')
counter = [0]
def animate(ts):
y = f(x, ts)
lines[0].set_ydata(y)
plt.legend(['ts=%4.2f' % ts])
#plt.savefig('tmp_%04d.png' % counter)
counter[0] += 1
anim = animation.FuncAnimation(plt.gcf(), animate, frames = t, interval = 1000)
plt.show()
I am trying to pull data from different end points using my python code and feeding the same data to plot a graph using matplotlib. I dont have any problem in reading the data but when i invoke the methods to plot graph by feeding the data i see intermittent error caused by matplot lib. below are the error details.
Traceback (most recent call last):
File "C:\Python35\lib\site-packages\slackbot\dispatcher.py", line 55, in _dispatch_msg_handler
func(Message(self._client, msg), *args)
File "C:\PycharmProjects\SlackBot\src\plugins\bot_response.py", line 248, in checkmarx
draw_chart.riskscore_bar(top_riskscore, project_name, "output_files", "riskscore_bar.png")
File "C:\PycharmProjects\SlackBot\src\drawchart.py", line 111, in riskscore_bar
fig, ax = plt.subplots()
File "C:\Python35\lib\site-packages\matplotlib\pyplot.py", line 1202, in subplots
fig = figure(**fig_kw)
File "C:\Python35\lib\site-packages\matplotlib\pyplot.py", line 535, in figure
**kwargs)
File "C:\Python35\lib\site-packages\matplotlib\backends\backend_tkagg.py", line 81, in new_figure_manager
return new_figure_manager_given_figure(num, figure)
File "C:\Python35\lib\site-packages\matplotlib\backends\backend_tkagg.py", line 98, in new_figure_manager_given_figure
icon_img = Tk.PhotoImage(file=icon_fname)
File "C:\Python35\lib\tkinter\__init__.py", line 3403, in __init__
Image.__init__(self, 'photo', name, cnf, master, **kw)
File "C:\Python35\lib\tkinter\__init__.py", line 3359, in __init__
self.tk.call(('image', 'create', imgtype, name,) + options)
RuntimeError: main thread is not in main loop
I have tried looking into other cases from stackoverflow with same error messages, but it didnt help me fix this. Below is my code snippet that invokes an error.
def riskscore_bar(self, top_riskscore, project_id, output_folder, output_filename):
logger.debug("Inside method plotgraph in drawchart.py.")
y_pos = np.arange(len(project_id))
width = .4
fig, ax = plt.subplots()
graph = ax.bar(y_pos+1, top_riskscore, width, color='#feb308')
ax.set_ylabel('Risk Score')
ax.set_title('Summary')
ax.set_xticks(y_pos + 1)
ax.set_xticklabels(project_id,fontsize=5, rotation=45 )
def autolabel(rects):
for rect in rects:
height = rect.get_height()
ax.text(rect.get_x() + rect.get_width()/2., 1.001*height,
'%d' % int(height),
ha='center', va='bottom')
autolabel(graph)
pylab.savefig(os.path.join(os.path.abspath(os.path.dirname(__file__)), '..', output_folder,output_filename))
The error seems to occur at "fig, ax = plt.subplots()". any ideas on how this can be fixed?
this can be solved by adding plt.switch_backend('agg') below right after you import matplotlib.pyplot as plt. As shown below
import matplotlib.pyplot as plt
plt.switch_backend('agg')
I'm trying to create an animation of my clustering where each cluster is a different color on a scatter plot and there are several clusters per plot. The next plot to show has the same clusters and colors but a different location.
I've searched around and so far have this (timePeriodData refers to a list of cluster objects. Each list contains the clusters for that time/plot and the cluster object has the x, y, and color data.):
plt.ion()
fig,ax = subplots(1,1)
ax.set_aspect('equal')
fig.canvas.draw()
background = fig.canvas.copy_from_bbox(ax.bbox)
for timeData in timePeriodData:
plt.clf()
#print timeperiod
for cluster in timeData:
#ax.scatter(cluster.dataX,cluster.dataY, color = cluster.color)
# restore background
plt.scatter(cluster.dataX,cluster.dataY, color = cluster.color)
#plt.show()
#fig.canvas.restore_region(background)
# redraw just the points
#ax.draw_artist()
# fill in the axes rectangle
#fig.canvas.blit(ax.bbox)
plt.draw()
time.sleep(1)
But the plot window eventually hangs and doesn't continue plotting after about 5 plots. You can see in the comments I also tried to save the background and update that, but I am doing something wrong there. What exactly needs to be updated confuses me and I can't find good documentation on what needs to be passed to draw_artist.
I've also tried to use the animation feature of matplotlib, but can't seem to get it working with what I am trying to do.
timeperiods = 4
fig, ax = plt.subplots()
#fig = plt.figure()
def update(timePeriod, *args):
clusterNum = 0
for cluster in args[timePeriod]:
scat = ax.scatter(cluster.dataX,cluster.dataY, color = cluster.color)
clusterNum +=1
#scat = ax.scatter(dataX, dataY, c = scalarMap.to_rgba(values[clusterNum]))
return scat
ani = animation.FuncAnimation(fig, update, frames=xrange(timeperiods),
fargs=(timePeriodData), blit = True)
plt.show()
It says something is not iterable, but I'm sure what part it is referring to. I'm also not sure if I can continually assign scat to ax.scatter and it will add the points or not. but I assume so. Error message is:
Exception in Tkinter callback
Traceback (most recent call last):
File "C:\Python27\lib\lib-tk\Tkinter.py", line 1470, in __call__
return self.func(*args)
File "C:\Python27\lib\site-packages\matplotlib\backends\backend_tkagg.py", line 276, in resize
self.show()
File "C:\Python27\lib\site-packages\matplotlib\backends\backend_tkagg.py", line 348, in draw
FigureCanvasAgg.draw(self)
File "C:\Python27\lib\site-packages\matplotlib\backends\backend_agg.py", line 451, in draw
self.figure.draw(self.renderer)
File "C:\Python27\lib\site-packages\matplotlib\artist.py", line 55, in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File "C:\Python27\lib\site-packages\matplotlib\figure.py", line 1040, in draw
self.canvas.draw_event(renderer)
File "C:\Python27\lib\site-packages\matplotlib\backend_bases.py", line 1693, in draw_event
self.callbacks.process(s, event)
File "C:\Python27\lib\site-packages\matplotlib\cbook.py", line 527, in process
proxy(*args, **kwargs)
File "C:\Python27\lib\site-packages\matplotlib\cbook.py", line 405, in __call__
return mtd(*args, **kwargs)
File "C:\Python27\lib\site-packages\matplotlib\animation.py", line 832, in _end_redraw
self._post_draw(None, self._blit)
File "C:\Python27\lib\site-packages\matplotlib\animation.py", line 778, in _post_draw
self._blit_draw(self._drawn_artists, self._blit_cache)
File "C:\Python27\lib\site-packages\matplotlib\animation.py", line 787, in _blit_draw
for a in artists:
TypeError: 'PathCollection' object is not iterable
Any help getting a working system would be great!
I am writing a program in Python, using matplotlib to (among other things) run an animation showing a numerical solution to the time-dependent Schrodinger Equation.
Everything is working fine, but once an animation has finished running, I would like the window it was in to close itself. My way of doing this (shown below) works, but exceptions are thrown up which I cant seem to catch. It works fine for what I need it to do, but the error looks very messy.
I have an alternative method which works without throwing an error, but requires the user to manually close the window (unacceptable for my purposes). Can someone please point out what I am doing wrong, or suggest a better option?
A simplified version of the relevant parts of my code follows:
from matplotlib import animation as ani
from matplotlib import pyplot as plt
multiplier = 0
def get_data(): # some dummy data to animate
x = range(-10, 11)
global multiplier
y = [multiplier * i for i in x]
multiplier += 0.005
return x, y
class Schrodinger_Solver(object):
def __init__(self, xlim = (-10, 10), ylim = (-10, 10), num_frames = 200):
self.num_frames = num_frames
self.fig = plt.figure()
self.ax = self.fig.add_subplot(111, xlim = xlim, ylim = ylim)
self.p_line, = self.ax.plot([], [])
self.ani = ani.FuncAnimation(self.fig, self.animate_frame,
init_func = self.init_func,
interval = 1, frames = self.num_frames,
repeat = False, blit = True)
plt.show()
def animate_frame(self, framenum):
data = get_data()
self.p_line.set_data(data[0], data[1])
if framenum == self.num_frames - 1:
plt.close()
# closes the window when the last frame is reached,
# but exception is thrown. Comment out to avoid the error,
# but then the window needs manual closing
return self.p_line,
def init_func(self):
self.p_line.set_data([], [])
return self.p_line,
Schrodinger_Solver()
I am running Python 2.7.2 on windows 7, with matplotlib 1.1.0
Thanks in advance
EDIT:
exception and traceback as follows:
Exception in Tkinter callback
Traceback (most recent call last):
File "C:\Python27\lib\lib-tk\Tkinter.py", line 1410, in __call__
return self.func(*args)
File "C:\Python27\lib\lib-tk\Tkinter.py", line 495, in callit
func(*args)
File "C:\Python27\lib\site-packages\matplotlib\backends\backend_tkagg.py", line 116, in _on_timer
TimerBase._on_timer(self)
File "C:\Python27\lib\site-packages\matplotlib\backend_bases.py", line 1092, in _on_timer
ret = func(*args, **kwargs)
File "C:\Python27\lib\site-packages\matplotlib\animation.py", line 315, in _step
still_going = Animation._step(self, *args)
File "C:\Python27\lib\site-packages\matplotlib\animation.py", line 177, in _step
self._draw_next_frame(framedata, self._blit)
File "C:\Python27\lib\site-packages\matplotlib\animation.py", line 197, in _draw_next_frame
self._post_draw(framedata, blit)
File "C:\Python27\lib\site-packages\matplotlib\animation.py", line 220, in _post_draw
self._blit_draw(self._drawn_artists, self._blit_cache)
File "C:\Python27\lib\site-packages\matplotlib\animation.py", line 240, in _blit_draw
ax.figure.canvas.blit(ax.bbox)
File "C:\Python27\lib\site-packages\matplotlib\backends\backend_tkagg.py", line 244, in blit
tkagg.blit(self._tkphoto, self.renderer._renderer, bbox=bbox, colormode=2)
File "C:\Python27\lib\site-packages\matplotlib\backends\tkagg.py", line 19, in blit
tk.call("PyAggImagePhoto", photoimage, id(aggimage), colormode, id(bbox_array))
TclError: this isn't a Tk application
Traceback (most recent call last):
File "C:\Python27\quicktest.py", line 44, in <module>
Schrodinger_Solver()
File "C:\Python27\quicktest.py", line 26, in __init__
plt.show()
File "C:\Python27\lib\site-packages\matplotlib\pyplot.py", line 139, in show
_show(*args, **kw)
File "C:\Python27\lib\site-packages\matplotlib\backend_bases.py", line 109, in __call__
self.mainloop()
File "C:\Python27\lib\site-packages\matplotlib\backends\backend_tkagg.py", line 69, in mainloop
Tk.mainloop()
File "C:\Python27\lib\lib-tk\Tkinter.py", line 325, in mainloop
_default_root.tk.mainloop(n)
AttributeError: 'NoneType' object has no attribute 'tk'
I can catch the second exception, the AttributeError, by a small change:
try: plt.show()
except AttributeError: pass
but the first part, the TclError, remains no matter what I try
I had the same problem a few minutes before... The reason was a very low interval-value in FuncAnimation. Your code tries to update the graphics evere 1 millisecond - quite fast! (1000 fps might not be needed). I tried interval=200 and the error was gone...
HTH
try with:
if framenum == self.num_frames - 1:
exit()
it works for me...
I am facing the exact same problem, and I managed to solve the issue by creating another Animation class. Essentially, I made two changes:
Write a custom class that overwrites the _stop and _step methods.
Riase an StopIteration error in the update function, instead of using plt.close. The exception will be caught and won't break the script.
Here is the code.
from matplotlib import animation as ani
from matplotlib import pyplot as plt
class FuncAnimationDisposable(ani.FuncAnimation):
def __init__(self, fig, func, **kwargs):
super().__init__(fig, func, **kwargs)
def _step(self, *args):
still_going = ani.Animation._step(self, *args)
if not still_going and self.repeat:
super()._init_draw()
self.frame_seq = self.new_frame_seq()
self.event_source.interval = self._repeat_delay
return True
elif (not still_going) and (not self.repeat):
plt.close() # this code stopped the window
return False
else:
self.event_source.interval = self._interval
return still_going
def _stop(self, *args):
# On stop we disconnect all of our events.
if self._blit:
self._fig.canvas.mpl_disconnect(self._resize_id)
self._fig.canvas.mpl_disconnect(self._close_id)
multiplier = 0
def get_data(): # some dummy data to animate
x = range(-10, 11)
global multiplier
y = [multiplier * i for i in x]
multiplier += 0.005
return x, y
class Schrodinger_Solver(object):
def __init__(self, xlim = (-10, 10), ylim = (-10, 10), num_frames = 200):
self.num_frames = num_frames
self.fig = plt.figure()
self.ax = self.fig.add_subplot(111, xlim = xlim, ylim = ylim)
self.p_line, = self.ax.plot([], [])
self.ani = FuncAnimationDisposable(self.fig, self.animate_frame,
init_func = self.init_func,
interval = 1, frames = self.num_frames,
repeat = False, blit = True)
plt.show()
def animate_frame(self, framenum):
data = get_data()
self.p_line.set_data(data[0], data[1])
if framenum == self.num_frames - 1:
raise StopIteration # instead of plt.close()
return self.p_line,
def init_func(self):
self.p_line.set_data([], [])
return self.p_line,
Schrodinger_Solver()
Schrodinger_Solver()
print(multiplier)
(The code snippet was tested with Python 3.7 and matplotlib 3.4.2.)