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Hide fully transparent text in PS output. #10166

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Merged
merged 1 commit into from
Jan 6, 2018
Merged

Hide fully transparent text in PS output. #10166

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5 changes: 4 additions & 1 deletion lib/matplotlib/backends/backend_ps.py
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Original file line number Diff line number Diff line change
Expand Up @@ -631,13 +631,16 @@ def draw_tex(self, gc, x, y, s, prop, angle, ismath='TeX!', mtext=None):

def draw_text(self, gc, x, y, s, prop, angle, ismath=False, mtext=None):
"""
draw a Text instance
Draw a Text instance.
"""
# local to avoid repeated attribute lookups
write = self._pswriter.write
if debugPS:
write("% text\n")

if len(gc.get_rgb()) == 4 and gc.get_rgb()[3] == 0:
return # Special handling for fully transparent.

if ismath=='TeX':
return self.draw_tex(gc, x, y, s, prop, angle)

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Binary file added lib/matplotlib/tests/baseline_images/test_backend_ps/empty.pdf
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9 changes: 9 additions & 0 deletions lib/matplotlib/tests/test_backend_ps.py
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Expand Up @@ -12,6 +12,7 @@
import matplotlib
import matplotlib.pyplot as plt
from matplotlib import patheffects
from matplotlib.testing.decorators import image_comparison
from matplotlib.testing.determinism import (_determinism_source_date_epoch,
_determinism_check)

Expand Down Expand Up @@ -148,3 +149,11 @@ def test_determinism_all():
def test_determinism_all_tex():
"""Test for reproducible PS/tex output"""
_determinism_check(format="ps", usetex=True)


@image_comparison(baseline_images=["empty"], extensions=["eps"])
def test_transparency():
fig, ax = plt.subplots()
ax.set_axis_off()
ax.plot([0, 1], color="r", alpha=0)
ax.text(.5, .5, "foo", color="r", alpha=0)