8000 Text antialiasing for mathtext (#26376) · matplotlib/matplotlib@98007a5 · GitHub
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Commit 98007a5

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stevezhang1999stevezhang1999
authored
Text antialiasing for mathtext (#26376)
1 parent b5149fd commit 98007a5

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6 files changed

+35
-9
lines changed

6 files changed

+35
-9
lines changed

‎doc/users/next_whats_new/antialiasing_text_annotation.rst

Lines changed: 1 addition & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -12,8 +12,7 @@ Examples:
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plt.text(0.5, 0.5, '6 inches x 2 inches', antialiased=True)
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ax.annotate('local max', xy=(2, 1), xytext=(3, 1.5), antialiased=False)
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15-
If the text contains math expression, then antialiasing will be set by :rc:`text.antialiased`, and *antialiased* will have no effect
16-
This applies to the whole text.
15+
If the text contains math expression, *antialiased* applies to the whole text.
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Examples:
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.. code-block::

‎lib/matplotlib/_mathtext.py

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -106,7 +106,7 @@ def to_vector(self):
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for x1, y1, x2, y2 in self.rects]
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return VectorParse(w, h + d, d, gs, rs)
108108

109-
def to_raster(self):
109+
def to_raster(self, antialiased=None):
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# Metrics y's and mathtext y's are oriented in opposite directions,
111111
# hence the switch between ymin and ymax.
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xmin = min([*[ox + info.metrics.xmin for ox, oy, info in self.glyphs],

‎lib/matplotlib/backends/backend_agg.py

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -175,7 +175,8 @@ def draw_path(self, gc, path, transform, rgbFace=None):
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def draw_mathtext(self, gc, x, y, s, prop, angle):
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"""Draw mathtext using :mod:`matplotlib.mathtext`."""
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ox, oy, width, height, descent, font_image = \
178-
self.mathtext_parser.parse(s, self.dpi, prop)
178+
self.mathtext_parser.parse(s, self.dpi, prop,
179+
antialiased=gc.get_antialiased())
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xd = descent * sin(radians(angle))
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yd = descent * cos(radians(angle))

‎lib/matplotlib/mathtext.py

Lines changed: 7 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -18,6 +18,7 @@
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import functools
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import logging
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21+
import matplotlib as mpl
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from matplotlib import _api, _mathtext
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from matplotlib.ft2font import LOAD_NO_HINTING
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from matplotlib.font_manager import FontProperties
@@ -58,7 +59,7 @@ def __init__(self, output):
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{"path": "vector", "agg": "raster", "macosx": "raster"},
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output=output.lower())
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61-
def parse(self, s, dpi=72, prop=None):
62+
def parse(self, s, dpi=72, prop=None, *, antialiased=None):
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"""
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Parse the given math expression *s* at the given *dpi*. If *prop* is
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provided, it is a `.FontProperties` object specifying the "default"
@@ -74,10 +75,12 @@ def parse(self, s, dpi=72, prop=None):
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# is mutable; key the cache using an internal copy (see
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# text._get_text_metrics_with_cache for a similar case).
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prop = prop.copy() if prop is not None else None
77-
return self._parse_cached(s, dpi, prop)
78+
if antialiased is None:
79+
antialiased = mpl.rcParams['text.antialiased']
80+
return self._parse_cached(s, dpi, prop, antialiased)
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7982
@functools.lru_cache(50)
80-
def _parse_cached(self, s, dpi, prop):
83+
def _parse_cached(self, s, dpi, prop, antialiased):
8184
from matplotlib.backends import backend_agg
8285

8386
if prop is None:
@@ -100,7 +103,7 @@ def _parse_cached(self, s, dpi, prop):
100103
if self._output_type == "vector":
101104
return output.to_vector()
102105
elif self._output_type == "raster":
103-
return output.to_raster()
106+
return output.to_raster(antialiased=antialiased)
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def math_to_image(s, filename_or_obj, prop=None, dpi=None, format=None,

‎lib/matplotlib/mathtext.pyi

Lines changed: 8 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -13,7 +13,14 @@ from matplotlib.typing import ColorType
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1414
class MathTextParser:
1515
def __init__(self, output: Literal["path", "agg", "raster", "macosx"]) -> None: ...
16-
def parse(self, s: str, dpi: float = ..., prop: FontProperties | None = ...): ...
16+
def parse(
17+
self,
18+
s: str,
19+
dpi: float = ...,
20+
prop: FontProperties | None = ...,
21+
*,
22+
antialiased: bool | None = ...
23+
): ...
1724

1825
def math_to_image(
1926
s: str,

‎lib/matplotlib/tests/test_text.py

Lines changed: 16 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -972,3 +972,19 @@ def test_text_antialiased_on_default_vs_manual(fig_test, fig_ref):
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973973
mpl.rcParams['text.antialiased'] = True
974974
fig_ref.text(0.5, 0.5, '6 inches x 2 inches')
975+
976+
977+
@check_figures_equal()
978+
def test_text_math_antialiased_on_default_vs_manual(fig_test, fig_ref):
979+
fig_test.text(0.5, 0.5, r"OutsideMath $I\'m \sqrt{2}$", antialiased=True)
980+
981+
mpl.rcParams['text.antialiased'] = True
982+
fig_ref.text(0.5, 0.5, r"OutsideMath $I\'m \sqrt{2}$")
983+
984+
985+
@check_figures_equal()
986+
def test_text_math_antialiased_off_default_vs_manual(fig_test, fig_ref):
987+
fig_test.text(0.5, 0.5, r"OutsideMath $I\'m \sqrt{2}$", antialiased=False)
988+
989+
mpl.rcParams['text.antialiased'] = False
990+
fig_ref.text(0.5, 0.5, r"OutsideMath $I\'m \sqrt{2}$")

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