Plot ellipse with arrow showing rotation #25477

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1. photoniker

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   on Mar 16, 2023
2. jklymak commented on Mar 16, 2023

   

   jklymak

   on Mar 16, 2023

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   I don't think we would add this to a low level patch like ellipse. It's certainly possible to get the effect you want with an annotation arrow and a basic ellipses. If you need help with that discourse.Matplotlib.org is a good place to ask.
3. tacaswell commented on Mar 16, 2023

   

   tacaswell

   on Mar 16, 2023

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   I agree that this is probably too specific to put into the core library, but I would be open to a PR adding that as an example or tutorial (I think there is a way to build up that figure step-by-step that would fit in the divio "tutorial" definition).

   👍React with 👍2Reacted by Jody Klymak and photoniker
4. photoniker commented on Mar 16, 2023

   

   photoniker

   on Mar 16, 2023

   Last edited by photoniker

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   Here is an example I created.

   import matplotlib.pyplot as plt
   import numpy as np
   
   fig, ax = plt.subplots(1, 1, subplot_kw={"aspect": "equal"})
   
   ax.axvline(c="grey", lw=1)
   ax.axhline(c="grey", lw=1)
   
   xVec = 0.5+0.5j
   yVec = 0.2+0.5j
   
   sampling = 101
   n = np.linspace(0, sampling, sampling)
   
   x = np.real(xVec * np.exp(1j * 2 * np.pi * n / sampling))
   y = np.real(yVec * np.exp(1j * 2 * np.pi * n / sampling))
   ax.plot(x, y)
   
   dx = x[-1] - x[-2]
   dy = y[-1] - y[-2]
   ax.arrow(x=x[-1], y=y[-1], dx=dx, dy=dy, head_width=0.05)
   
   ax.grid()
   ax.set_xlim((-1, 1))
   ax.set_ylim((-1, 1))
   plt.show()
   
5. jklymak

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   on Mar 16, 2023
6. tacaswell

   added this to the future releases milestone on Mar 16, 2023
7. photoniker

   added a commit that references this issue on Apr 27, 2023

   Adding ellipse_arrow.py example and fix matplotlib#25477

   This issue will close once commit eeed6fc is merged into the 'main' branch.

   eeed6fc
8. ksunden

   closed this as completedin #25779on Jun 12, 2023
9. ksunden

   added a commit that references this issue on Jun 12, 2023

   Merge pull request #25779 from photoniker/add_Ellipse_Arrow_Example

   ...

   This issue will close once commit c3a2794 is merged into the 'main' branch.

   c3a2794
10. QuLogic

    modified the milestones: future releases, v3.8.0 on Jun 12, 2023
11. melissawm

    added a commit that references this issue on Jun 15, 2023

    Adding ellipse_arrow.py example and fix matplotlib#25477

    This issue will close once commit 5b65397 is merged into the 'main' branch.

    5b65397