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PPTX: a column plot's category labels seat 12.3pt below native, past the chart frame's bottom edge #1868
Description
Activity
- added a commit that references this issue
on Sep 24, 2026 The wrapped regime of #1675 landed in #1877, and this seat is what it leaves
behind on the same frame. Posting the numbers so the magnitude this issue
carries covers the wrapped case too, since #1877's committed cluster
dispositions cite them.Same probe frame,
scripts/probes/issue-1675-column-label-wrap.jsonvariant
two words—tests/fixtures/pptx/bar-chart.pptxrepackaged as a 36pt column
chart on the deck's own 480 x 320pt graphic frame. Reference: the native
PowerPoint 16.113.1 export of that package,mutool draw -F trace, page points
measured down from the page top.plot bottom first label baseline below the plot second line baseline native PowerPoint 16.113.1 312.760 369.600 56.840 413.520 office2pdf after #1877 312.758 387.331 74.573 431.276 The band is now native to 0.002pt and the two lines advance 43.945pt against
the native 43.92, so the block is the right size and breaks where PowerPoint
breaks it. It is seated 17.733pt too low inside that band, and the second line
inherits the same error (17.756pt), which is this issue's rule rather than the
band's.The one-line figure in the body above is 12.294pt at an 18pt axis; this is the
same defect at 36pt over two lines, so whatever share of the face is measured
has to fit both.
Summary
A framed PowerPoint column plot's flat category labels are seated against the
bottom of the band rather than against the plot, so they sit about 12.3pt lower
than native PowerPoint puts them. On a chart whose band is the native size the
label baseline now falls below the chart frame's own bottom edge.
Measured
tests/fixtures/pptx/bar-chart.pptxrepackaged as an Arial column chart byscripts/probes/issue-1674-column-plot-face.json, on the deck's own480 x 320pt graphic frame at (120, 110)pt. Reference: the native PowerPoint
16.113.1 export of that variant package,
mutool draw -F trace, page pointsmeasured down from the page top.
1st QtrbaselineThe 12.294pt difference is the same on all four labels (
1st Qtr…4th Qtr),and it is unchanged by #1674's band fix: before that fix our plot bottom sat
2.497pt higher and our label sat 2.497pt higher with it, so the distance below
the plot was 39.05pt in both builds. The band's size is native; the label's
seat inside it is not.
The band is 37.473pt for this 18pt category axis, and native spends 26.753pt of
it getting to the baseline — leaving room for the descender and a little more.
We spend 39.047pt, which is more than the whole band.
Expected
The category label's baseline is seated against the plot's bottom edge on a
measured share of the face, the way
[
ChartFaceLineBox::category_band_pt] sizes the band itself. A one-factor faceand size sweep of the same three probe specs settles the share; the band's own
5/3 ascent + 1 descentcomposition (#1674) suggests the label's own lineoccupies the lower part of it, but that is a hypothesis until measured.
Related: #1674