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Customizable subplot title font #5393

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Customizable subplot title font #5393

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3 changes: 3 additions & 0 deletions CHANGELOG.md
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,9 @@ This project adheres to [Semantic Versioning](http://semver.org/).

## Unreleased

### Added
- Add optional `font` parameter for `make_subplots` [[#5393](https://github.com/plotly/plotly.py/pull/5393)]

## [6.4.0] - 2025-11-02

### Updated
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22 changes: 15 additions & 7 deletions plotly/_subplots.py
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Expand Up @@ -58,6 +58,7 @@ def make_subplots(
x_title=None,
y_title=None,
figure=None,
font=None,
**kwargs,
):
"""
Expand Down Expand Up @@ -235,6 +236,9 @@ def make_subplots(
layout of this figure and this figure will be returned. If the figure
already contains axes, they will be overwritten.

font: dict (default None)
Font used by any title of the subplots.

Examples
--------

Expand Down Expand Up @@ -814,7 +818,7 @@ def _check_hv_spacing(dimsize, spacing, name, dimvarname, dimname):

# Add subplot titles
plot_title_annotations = _build_subplot_title_annotations(
subplot_titles, list_of_domains
subplot_titles, list_of_domains, font=font
)

layout["annotations"] = plot_title_annotations
Expand All @@ -835,7 +839,7 @@ def _check_hv_spacing(dimsize, spacing, name, dimvarname, dimname):

# Add subplot titles
column_title_annotations = _build_subplot_title_annotations(
column_titles, domains_list
column_titles, domains_list, font=font
)

layout["annotations"] += tuple(column_title_annotations)
Expand All @@ -849,7 +853,7 @@ def _check_hv_spacing(dimsize, spacing, name, dimvarname, dimname):

# Add subplot titles
column_title_annotations = _build_subplot_title_annotations(
row_titles, domains_list, title_edge="right"
row_titles, domains_list, title_edge="right", font=font
)

layout["annotations"] += tuple(column_title_annotations)
Expand All @@ -859,7 +863,7 @@ def _check_hv_spacing(dimsize, spacing, name, dimvarname, dimname):

# Add subplot titles
column_title_annotations = _build_subplot_title_annotations(
[x_title], domains_list, title_edge="bottom", offset=30
[x_title], domains_list, title_edge="bottom", offset=30, font=font
)

layout["annotations"] += tuple(column_title_annotations)
Expand All @@ -869,7 +873,7 @@ def _check_hv_spacing(dimsize, spacing, name, dimvarname, dimname):

# Add subplot titles
column_title_annotations = _build_subplot_title_annotations(
[y_title], domains_list, title_edge="left", offset=40
[y_title], domains_list, title_edge="left", offset=40, font=font
)

layout["annotations"] += tuple(column_title_annotations)
Expand Down Expand Up @@ -1163,7 +1167,7 @@ def _get_cartesian_label(x_or_y, r, c, cnt):


def _build_subplot_title_annotations(
subplot_titles, list_of_domains, title_edge="top", offset=0
subplot_titles, list_of_domains, title_edge="top", offset=0, font=None
):
# If shared_axes is False (default) use list_of_domains
# This is used for insets and irregular layouts
Expand All @@ -1173,6 +1177,10 @@ def _build_subplot_title_annotations(
subtitle_pos_x = []
subtitle_pos_y = []

# If no font size is provided, use this fallback
if font is None:
font = dict(size=16)

if title_edge == "top":
text_angle = 0
xanchor = "center"
Expand Down Expand Up @@ -1236,7 +1244,7 @@ def _build_subplot_title_annotations(
"yref": "paper",
"text": subplot_titles[index],
"showarrow": False,
"font": dict(size=16),
"font": font,
"xanchor": xanchor,
"yanchor": yanchor,
}
Expand Down