|
| 1 | +""" |
| 2 | +================================== |
| 3 | +Parameterized animation function |
| 4 | +================================== |
| 5 | +
|
| 6 | +
|
| 7 | +Create an `.FuncAnimation` animation updating function that takes as input the frame, |
| 8 | +objects being animated, and data set. |
| 9 | +""" |
| 10 | + |
| 11 | +importfunctools |
| 12 | + |
| 13 | +importmatplotlib.pyplotasplt |
| 14 | +importnumpyasnp |
| 15 | + |
| 16 | +importmatplotlib.animationasanimation |
| 17 | + |
| 18 | + |
| 19 | +defupdate(frame,line,text,decades,widgets_data): |
| 20 | +# frame (int): The current frame number. |
| 21 | +# line (Line2D): The line object to update. |
| 22 | +# text (Text): The text annotation object to update. |
| 23 | +# decades (numpy.ndarray): Array of decades. |
| 24 | +# widgets_data (numpy.ndarray): Array of widgets data. |
| 25 | + |
| 26 | +current_decade=decades[frame] |
| 27 | +current_widgets=int(widgets_data[frame]) |
| 28 | + |
| 29 | +line.set_data(decades[:frame+1],widgets_data[:frame+1]) |
| 30 | +text.set_text(f'Decade:{current_decade}\nNumber of Widgets:{current_widgets}') |
| 31 | + |
| 32 | +returnline,text |
| 33 | + |
| 34 | +# Set up the animation |
| 35 | + |
| 36 | +# Constants |
| 37 | +decades=np.arange(1940,2020,10) |
| 38 | +initial_widgets=10000# Rough estimate of the no. of widgets in the 1950s |
| 39 | + |
| 40 | +# Generate rough growth data |
| 41 | +growth_rate=np.random.uniform(1.02,3.10,size=len(decades)) |
| 42 | +widgets_data=np.cumprod(growth_rate)*initial_widgets |
| 43 | + |
| 44 | +# Set up the initial plot |
| 45 | +fig,ax=plt.subplots() |
| 46 | + |
| 47 | +# create an empty line |
| 48 | +line,=ax.plot([], []) |
| 49 | + |
| 50 | +# display the current decade |
| 51 | +text=ax.text(0.5,0.85,'',transform=ax.transAxes, |
| 52 | +fontsize=12,ha='center',va='center') |
| 53 | + |
| 54 | +ax.set(xlabel='Decade',ylabel='Number of Widgets', |
| 55 | +xlim=(1940,2020), |
| 56 | +ylim=(0,max(widgets_data)+100000)) |
| 57 | + |
| 58 | + |
| 59 | +ani=animation.FuncAnimation( |
| 60 | +fig, |
| 61 | +# bind arguments to the update function, leave only frame unbound |
| 62 | +functools.partial(update,line=line,text=text, |
| 63 | +decades=decades,widgets_data=widgets_data), |
| 64 | +frames=len(decades), |
| 65 | +interval=1000, |
| 66 | +) |
| 67 | + |
| 68 | +plt.show() |