[REQUEST] When I use animation.FuncAnimation to make animation of source, including move and rotation in real time, the history info of source will keep all time by using display

[caimingxue]

Is your feature request related to some problem? If yes, please describe.
A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]

Describe the feature you'd like
A clear and concise description of what you want to happen.

Describe alternatives or solutions you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Add any other context or screenshots about the feature request here.

[OrtnerMichael]

sorry thats too vague. Please describe the problem in more detail.

[caimingxue]

sorry thats too vague. Please describe the problem in more detail.
this is a part of the code to show an animation of coil rotation. The problem is the display function, which can not eliminate the trajectory of the coil
def animate(simData):
# ax.collections = [] # clear lines streamplot
# ax.patches = [] # clear arrowheads streamplot
coil_c.rotate_from_angax(np.rad2deg(simData[3]), 'x', anchor=COIL_C.GetCoilOrigin(coil_c))
print('=========================================', np.rad2deg(simData[1]),
np.rad2deg(simData[2]), np.rad2deg(simData[3]))

coil_c.display(axis=ax, markers=[COIL_A.GetCoilOrigin(coil_a)])

anim = animation.FuncAnimation(fig, animate, simData, interval=200, blit=False,
repeat=True)

plt.show()
this is the animation result when rotating a coil

[lucasgcb]

Hi caimingxue,

I'm not able to run the code you've provided. Please provide a code snippet anyone can run so more people can understand your situation.

[OrtnerMichael]

The problem is that you create a Matplotlib plotting canvas ax. Then you use the magpy.display(axis=ax) function to plot on that canvas repeated times. As a result you see multiple plots on top of each other. The same will happen when you use simple ax.plot(something) repeated times.

You have to create a new, empty figure every time before you add it to your animation - or you delete what you already put there in the step before.

[Alexboiboi]

closing this, as it is not really a magpylib issue and more a matplotlib related one ;)

Feel free to reopen it if there is more to it