rotated text does not align

[chapochn]

Bug report

Bug summary

rotating different text by 90 degrees give different baseline alignment

Code for reproduction

import matplotlib.pyplot as plt
plt.figure(figsize=(2., 2.))
plt.text(0.5, 0.0, 'yB', fontsize=40, rotation=90)
plt.text(0.5, 0.5, 'By', fontsize=40, rotation=90)
plt.show()

Actual outcome

Expected outcome

Expected 'yB' and 'By' to be aligned

Matplotlib version

• Operating system: CentOS Linux 7
• Matplotlib version: 3.0.3
• Matplotlib backend (print(matplotlib.get_backend())): Qt5Agg
• Python version: 3.6.8

installed via conda

[timhoffm]

A modified version of the text rotation example shows that the bbox is at the correct place but the text is not rendered in the correct position relative to the bbox:

import matplotlib.pyplot as plt
from mpl_toolkits.axes_grid1.axes_grid import ImageGrid


def test_rotation_mode(fig, mode, subplot_location):
    ha_list = ["left", "center", "right"]
    va_list = ["top", "center", "baseline", "bottom"]
    grid = ImageGrid(fig, subplot_location,
                     nrows_ncols=(len(va_list), len(ha_list)),
                     share_all=True, aspect=True, cbar_mode=None)

    # labels and title
    for ha, ax in zip(ha_list, grid.axes_row[-1]):
        ax.axis["bottom"].label.set_text(ha)
    for va, ax in zip(va_list, grid.axes_column[0]):
        ax.axis["left"].label.set_text(va)
    grid.axes_row[0][1].set_title(f"rotation_mode='{mode}'", size="large")

    if mode == "default":
        kw = dict()
    else:
        kw = dict(
            bbox=dict(boxstyle="square,pad=0.", ec="none", fc="C1", alpha=0.3))

    # use a different text alignment in each axes
    texts = {}
    for (va, ha), ax in zip([(x, y) for x in va_list for y in ha_list], grid):
        # prepare axes layout
        for axis in ax.axis.values():
            axis.toggle(ticks=False, ticklabels=False)
        ax.axvline(0.5, color="skyblue", zorder=0)
        ax.axhline(0.5, color="skyblue", zorder=0)
        ax.plot(0.5, 0.5, color="C0", marker="o", zorder=1)

        # add text with rotation and alignment settings
        tx = ax.text(0.5, 0.5, 'yB',
                     size=20, rotation=90,
                     horizontalalignment=ha, verticalalignment=va,
                     rotation_mode=mode, **kw)
        tx2 = ax.text(0.5, 0.515, 'By',
                     size=20, rotation=90,
                     horizontalalignment=ha, verticalalignment=va,
                     rotation_mode=mode, **kw)
        texts[ax] = (tx, tx2)

    if mode == "default":
        # highlight bbox
        fig.canvas.draw()
        for ax, txts in texts.items():
            for tx in txts:
                bb = tx.get_window_extent().transformed(ax.transData.inverted())
                rect = plt.Rectangle((bb.x0, bb.y0), bb.width, bb.height,
                                     facecolor="C1", alpha=0.3, zorder=2)
                ax.add_patch(rect)


fig = plt.figure(figsize=(16, 12))
test_rotation_mode(fig, "default", 121)
test_rotation_mode(fig, "anchor", 122)
plt.show()

Edit: updated the code to run on recent versions.

[github-actions]

This issue has been marked "inactive" because it has been 365 days since the last comment. If this issue is still present in recent Matplotlib releases, or the feature request is still wanted, please leave a comment and this label will be removed. If there are no updates in another 30 days, this issue will be automatically closed, but you are free to re-open or create a new issue if needed. We value issue reports, and this procedure is meant to help us resurface and prioritize issues that have not been addressed yet, not make them disappear. Thanks for your help!

[oscargus]

Related: #23021 #13044

Maybe related: #14177 #21653