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Commit1d8d991

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Merge pull request#20518 from takimata/pgf_sketch_path
ENH: Support sketch_params in pgf backend
2 parentse70f5b6 +0e5783f commit1d8d991

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‎lib/matplotlib/artist.py

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@@ -690,6 +690,9 @@ def set_sketch_params(self, scale=None, length=None, randomness=None):
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The scale factor by which the length is shrunken or
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expanded (default 16.0)
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The PGF backend uses this argument as an RNG seed and not as
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described above. Using the same seed yields the same random shape.
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.. ACCEPTS: (scale: float, length: float, randomness: float)
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"""
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ifscaleisNone:

‎lib/matplotlib/backends/backend_pgf.py

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@@ -600,6 +600,30 @@ def _print_pgf_path(self, gc, path, transform, rgbFace=None):
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r"{\pgfqpoint{%fin}{%fin}}"
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%coords)
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# apply pgf decorators
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sketch_params=gc.get_sketch_params()ifgcelseNone
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ifsketch_paramsisnotNone:
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# Only "length" directly maps to "segment length" in PGF's API.
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# PGF uses "amplitude" to pass the combined deviation in both x-
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# and y-direction, while matplotlib only varies the length of the
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# wiggle along the line ("randomness" and "length" parameters)
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# and has a separate "scale" argument for the amplitude.
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# -> Use "randomness" as PRNG seed to allow the user to force the
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# same shape on multiple sketched lines
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scale,length,randomness=sketch_params
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ifscaleisnotNone:
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# make matplotlib and PGF rendering visually similar
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length*=0.5
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scale*=2
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# PGF guarantees that repeated loading is a no-op
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writeln(self.fh,r"\usepgfmodule{decorations}")
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writeln(self.fh,r"\usepgflibrary{decorations.pathmorphing}")
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writeln(self.fh,r"\pgfkeys{/pgf/decoration/.cd, "
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f"segment length ={(length*f):f}in, "
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f"amplitude ={(scale*f):f}in}}")
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writeln(self.fh,f"\\pgfmathsetseed{{{int(randomness)}}}")
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writeln(self.fh,r"\pgfdecoratecurrentpath{random steps}")
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def_pgf_path_draw(self,stroke=True,fill=False):
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actions= []
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ifstroke:

‎lib/matplotlib/tests/test_backend_pgf.py

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@@ -337,3 +337,30 @@ def test_minus_signs_with_tex(fig_test, fig_ref, texsystem):
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mpl.rcParams["pgf.texsystem"]=texsystem
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fig_test.text(.5,.5,"$-1$")
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fig_ref.text(.5,.5,"$\N{MINUS SIGN}1$")
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@pytest.mark.backend("pgf")
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deftest_sketch_params():
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fig,ax=plt.subplots(figsize=(3,3))
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ax.set_xticks([])
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ax.set_yticks([])
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ax.set_frame_on(False)
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handle,=ax.plot([0,1])
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handle.set_sketch_params(scale=5,length=30,randomness=42)
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withBytesIO()asfd:
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fig.savefig(fd,format='pgf')
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buf=fd.getvalue().decode()
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baseline=r"""\pgfpathmoveto{\pgfqpoint{0.375000in}{0.300000in}}%
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\pgfpathlineto{\pgfqpoint{2.700000in}{2.700000in}}%
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\usepgfmodule{decorations}%
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\usepgflibrary{decorations.pathmorphing}%
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\pgfkeys{/pgf/decoration/.cd, """ \
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r"""segment length = 0.150000in, amplitude = 0.100000in}%
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\pgfmathsetseed{42}%
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\pgfdecoratecurrentpath{random steps}%
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\pgfusepath{stroke}%"""
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# \pgfdecoratecurrentpath must be after the path definition and before the
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# path is used (\pgfusepath)
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assertbaselineinbuf

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