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WIP: for non-interactive backends make fig.canvas.draw() force the render #16573

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2 changes: 2 additions & 0 deletions azure-pipelines.yml
Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,8 @@
# Create and test a Python package on multiple Python versions.
# Add steps that analyze code, save the dist with the build record, publish to a PyPI-compatible index, and more:
# https://docs.microsoft.com/azure/devops/pipelines/languages/python
pr: none
trigger: none

strategy:
matrix:
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6 changes: 6 additions & 0 deletions lib/matplotlib/backends/backend_pgf.py
Original file line number Diff line number Diff line change
Expand Up @@ -870,6 +870,12 @@ def _print_pgf_to_fh(self, fh, *,
writeln(fh, r"\makeatother")
writeln(fh, r"\endgroup")


def draw(self):
# docstring inherited
self.figure.draw(self.get_renderer())


def print_pgf(self, fname_or_fh, *args, **kwargs):
"""
Output pgf macros for drawing the figure so it can be included and
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13 changes: 13 additions & 0 deletions lib/matplotlib/tests/test_backend_pgf.py
Original file line number Diff line number Diff line change
Expand Up @@ -324,3 +324,16 @@ def test_bbox_inches_tight(tmpdir):
ax.imshow([[0, 1], [2, 3]])
fig.savefig(os.path.join(tmpdir, "test.pdf"), backend="pgf",
bbox_inches="tight")


@needs_pdflatex
@pytest.mark.style('default')
@pytest.mark.backend('pgf')
def test_draw():
mpl.rcParams['pgf.texsystem'] = 'pdflatex'
fig, ax = plt.subplots()
ax.plot(np.arange(10))
old_Nticks = len(ax.yaxis.majorTicks)
fig.canvas.draw()
new_Nticks = len(ax.yaxis.majorTicks)
assert old_Nticks != new_Nticks