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Add overset/underset whatsnew entry #19497

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Merged
merged 4 commits into from
Feb 11, 2021
Merged

Add overset/underset whatsnew entry #19497

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9649d83
Add overset/underset whatsnew entry
aitikgupta Feb 11, 2021
2913f08
Exchange variable names
aitikgupta Feb 11, 2021
d891481
Simplify whatsnew entry
aitikgupta Feb 11, 2021
c82cadd
One more exchange
aitikgupta Feb 11, 2021
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11 changes: 11 additions & 0 deletions doc/users/next_whats_new/mathtext.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,11 @@
``matplotlib.mathtext`` now supports *overset* and *underset* LaTeX symbols
---------------------------------------------------------------------------

`.mathtext` now supports *overset* and *underset*, called as
``\overset{annotation}{body}`` or ``\underset{annotation}{body}``, where
*annotation* is the text "above" or "below" the *body*.

.. plot::

math_expr = r"$ x \overset{f}{\rightarrow} y \underset{f}{\leftarrow} z $"
plt.text(0.4, 0.5, math_expr, usetex=False)
34 changes: 17 additions & 17 deletions lib/matplotlib/_mathtext.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2859,32 +2859,32 @@ def binom(self, s, loc, toks):
return self._genfrac('(', ')', 0.0, self._MathStyle.TEXTSTYLE,
num, den)

def _genset(self, state, body, annotation, overunder):
def _genset(self, state, annotation, body, overunder):
thickness = state.font_output.get_underline_thickness(
state.font, state.fontsize, state.dpi)

body.shrink()
annotation.shrink()

cbody = HCentered([body])
cannotation = HCentered([annotation])
width = max(cbody.width, cannotation.width)
cbody.hpack(width, 'exactly')
cbody = HCentered([body])
width = max(cannotation.width, cbody.width)
cannotation.hpack(width, 'exactly')
cbody.hpack(width, 'exactly')

vgap = thickness * 3
if overunder == "under":
vlist = Vlist([cannotation, # annotation
Vbox(0, vgap), # space
cbody # body
vlist = Vlist([cbody, # body
Vbox(0, vgap), # space
cannotation # annotation
])
# Shift so the annotation sits in the same vertical position
shift_amount = cannotation.depth + cbody.height + vgap
# Shift so the body sits in the same vertical position
shift_amount = cbody.depth + cannotation.height + vgap

vlist.shift_amount = shift_amount
else:
vlist = Vlist([cbody, # body
Vbox(0, vgap), # space
cannotation # annotation
vlist = Vlist([cannotation, # annotation
Vbox(0, vgap), # space
cbody # body
])

# To add horizontal gap between symbols: wrap the Vlist into
Expand Down Expand Up @@ -2956,18 +2956,18 @@ def overset(self, s, loc, toks):
assert len(toks[0]) == 2

state = self.get_state()
body, annotation = toks[0]
annotation, body = toks[0]

return self._genset(state, body, annotation, overunder="over")
return self._genset(state, annotation, body, overunder="over")

def underset(self, s, loc, toks):
assert len(toks) == 1
assert len(toks[0]) == 2

state = self.get_state()
body, annotation = toks[0]
annotation, body = toks[0]

return self._genset(state, body, annotation, overunder="under")
return self._genset(state, annotation, body, overunder="under")

def _auto_sized_delimiter(self, front, middle, back):
state = self.get_state()
Expand Down