matplotlib / matplotlib/ipympl
MPL Event Handling Doc Example not fully functioning
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Description
I tried the example from the MPL event handling docs: a bar chart with draggable bars ("extra credit" version). This works fine in QT5Agg backend, but doesn't fully work in Jupyter Lab (v3.0.7) with ipympl (v0.7.0). The plot displays fine, and I can see that click and drag events are being received by the widget, but during drag, the bars vanish. In fact, if in the click handler I include a color change:
self.rect.set(animated=True,color='red')
Then I can see a faint red outline after the bar is "dropped" in the correct location (see below). So clearly the click/drag/release events are working, but the bar drawing during and after drag via draw_artist and blit are not.
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First steps
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Research direction
Reproduce the draggable rectangle exercise from the MPL event handling documentation with JupyterLab 3.0.7 and ipympl 0.7.0, then compare it with QT5Agg. Trace the draw_artist and blit calls during dragging; done means the bars remain visible and draggable in the Jupyter environment.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- jupyter, python
- Domain
- frontend
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100