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Add support for overriding x tick with non arithmetic progression values #5262

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674d40e
Add support for overriding x tick with non arithmetic progression values
robertoffmoura Jun 15, 2025
85745d7
Run ruff format
robertoffmoura Aug 12, 2025
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Add support for overriding x tick with non arithmetic progression values
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@robertoffmoura
robertoffmoura committed Oct 9, 2025
commit 674d40eec54f37357517ebe6f0567fea5d116fdd
13 changes: 11 additions & 2 deletions plotly/matplotlylib/mpltools.py
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Original file line number Diff line number Diff line change
Expand Up @@ -451,9 +451,9 @@ def prep_ticks(ax, index, ax_type, props):
tick0 = tickvalues[0]
dticks = [
round(tickvalues[i] - tickvalues[i - 1], 12)
for i in range(1, len(tickvalues) - 1)
for i in range(1, len(tickvalues))
]
if all([dticks[i] == dticks[i - 1] for i in range(1, len(dticks) - 1)]):
if all([dticks[i] == dticks[i - 1] for i in range(1, len(dticks))]):
dtick = tickvalues[1] - tickvalues[0]
else:
warnings.warn(
Expand All @@ -463,6 +463,8 @@ def prep_ticks(ax, index, ax_type, props):
raise TypeError
except (IndexError, TypeError):
axis_dict["nticks"] = props["axes"][index]["nticks"]
if props["axes"][index]["tickvalues"] is not None:
axis_dict["tickvals"] = props["axes"][index]["tickvalues"]
else:
axis_dict["tick0"] = tick0
axis_dict["dtick"] = dtick
Expand Down Expand Up @@ -511,6 +513,13 @@ def prep_ticks(ax, index, ax_type, props):

if formatter == "LogFormatterMathtext":
axis_dict["exponentformat"] = "e"
elif formatter == "FuncFormatter" and props["axes"][index]["tickformat"] is not None:
to_remove = ["dtick" "tickmode"]
for key in to_remove:
if key in axis_dict:
axis_dict.pop(key)
axis_dict["ticktext"] = props["axes"][index]["tickformat"]
axis_dict["tickvals"] = props["axes"][index]["tickvalues"]
return axis_dict


Expand Down
23 changes: 23 additions & 0 deletions plotly/matplotlylib/tests/test_renderer.py
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Expand Up @@ -84,3 +84,26 @@ def test_multiple_traces_native_legend():
assert plotly_fig.data[0].mode == "lines"
assert plotly_fig.data[1].mode == "markers"
assert plotly_fig.data[2].mode == "lines+markers"


def test_non_arithmetic_progression_xtickvals():
xticks = [0.01, 0.53, 0.75]
plt.figure()
plt.plot([0, 1], [0, 1])
plt.xticks(xticks)

plotly_fig = tls.mpl_to_plotly(plt.gcf())

assert plotly_fig.layout.xaxis.tickvals == tuple(xticks)

def test_non_arithmetic_progression_xticktext():
xtickvals = [0.01, 0.53, 0.75]
xticktext = ["Baseline", "param = 1", "param = 2"]
plt.figure()
plt.plot([0, 1], [0, 1])
plt.xticks(xtickvals, xticktext)

plotly_fig = tls.mpl_to_plotly(plt.gcf())

assert plotly_fig.layout.xaxis.tickvals == tuple(xtickvals)
assert plotly_fig.layout.xaxis.ticktext == tuple(xticktext)