Unexpected behavior when rotating x-axis text

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Valutazione

Difficoltà
3/5
Tempo stimato
Mezza giornata
Idoneità per principianti
55/100
Tipo di issue
Bug
Chiarezza
Abbastanza chiara
Stato di attività
Attiva
Stack tecnologico
matplotlib, python
Ambito
data-visualization

Direzione di ricerca

Start by reading the axis text positioning and rotation code in plotnine, then check how element_text passes alignment and rotation_mode to Matplotlib. Reproduce the reported combinations from the issue with the supplied example and compare label anchors against tick positions. Done means the rotated labels can be aligned as described without shifting too far left or down.

Scritto dal modello di indicizzazione a partire dal testo della issue.

Descrizione

Enhancement

First off, I'm really grateful for plotnine because for a long time, my biggest complaint with python was not having a good implementation of the grammar of graphics like R's ggplot2. In my opinion, plotnine has filled that space beautifully. That being said, I'm currently struggling with positioning tick labels on a plot I'm working on. Here's a small example to illustrate the issue I'm having:

With default parameters, everything looks as expected:

import plotnine as pn
import polars as pl


data = pl.DataFrame(
    {
        "x": ["aaaaa", "bbbbb", "ccccc"],
        "y": [1, 1, 1]
    }
)

plot = (
    pn.ggplot(data, pn.aes("x", "y"))
    + pn.geom_point()
)

Output:

Image

I can then rotate the x-axis labels just fine:

plot = (
    pn.ggplot(data, pn.aes("x", "y"))
    + pn.geom_point()
    + pn.theme(
        axis_text_x=pn.element_text(rotation=45)
    )
)

Output:

Image

What I'd like to achieve is shift the rotated x-axis labels to the left such that the end of the label falls directly below the corresponding tick mark. I first tried setting ha="right" but this moved the labels too far (i.e., if you trace along the center axis of the letters in each label, you get to the end of the label before you reach the x-position of the tick):

plot = (
    pn.ggplot(data, pn.aes("x", "y"))
    + pn.geom_point()
    + pn.theme(
        axis_text_x=pn.element_text(rotation=45, ha="right")
    )
)

Output:

Image

I figure that what I'm going for is anchoring the center-right point of the label to a point just below the tick, and then rotating around that anchor. If I set ha="right" and va="center" without rotating, it appears that the anchor point is in the correct location (i.e., directly below the tick):

plot = (
    pn.ggplot(data, pn.aes("x", "y"))
    + pn.geom_point()
    + pn.theme(
        axis_text_x=pn.element_text(ha="right", va="center")
    )
)

Output:

Image

But then when I rotate, it does not appear to be rotating around that anchor point. Instead the labels shift way down and also still end up positioned too far to the left:

plot = (
    pn.ggplot(data, pn.aes("x", "y"))
    + pn.geom_point()
    + pn.theme(
        axis_text_x=pn.element_text(rotation=45, ha="right", va="center", rotation_mode="anchor")
    )
)

Output:

Image

I've also tried lots of other combinations of values for ha, va, and rotation_mode, but can't seem to get the labels in the right position. Any help would be appreciated.

  • Plotnine version: 0.15.8
  • Matplotlib version: 3.11.1
  • Python version: 3.11.14
Lingua principale
Python
Stelle
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Fork
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Merge medio
2g 12h
PR unite (30g)
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