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feat: support passing custom fonts to imgui #978

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feat: support passing custom fonts to imgui #978

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8b19f81
feat: support passing custom fonts to imgui
mokurin000 Jan 14, 2026
3583140
docs: comment on custom_fonts usage
mokurin000 Jan 14, 2026
62fce4a
feat: allow to override default fonts
mokurin000 Jan 14, 2026
087f1a4
fix: set font merge mode
mokurin000 Jan 14, 2026
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7 changes: 7 additions & 0 deletions fastplotlib/layouts/_figure.py
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Original file line number Diff line number Diff line change
Expand Up @@ -53,6 +53,8 @@ def __init__(
size: tuple[int, int] = (500, 300),
names: list | np.ndarray = None,
show_tooltips: bool = False,
custom_fonts: list[tuple[str, float]] = None,
override_default_font: bool = False,
):
"""
Create a Figure containing Subplots.
Expand Down Expand Up @@ -127,6 +129,11 @@ def __init__(
show_tooltips: bool, default False
show tooltips on graphics

custom_fonts: list[tuple[str, float]], optional
Custom font file path and pixel sizes, TrueType/OpenType are supported.

override_default_font: bool, default False
Load custom fonts before default fonts
"""

if rects is not None:
Expand Down
34 changes: 23 additions & 11 deletions fastplotlib/layouts/_imgui_figure.py
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Original file line number Diff line number Diff line change
Expand Up @@ -45,6 +45,8 @@ def __init__(
size: tuple[int, int] = (500, 300),
names: list | np.ndarray = None,
show_tooltips: bool = False,
custom_fonts: list[tuple[str, float]] = None,
override_default_font: bool = False,
):
self._guis: dict[str, EdgeWindow] = {k: None for k in GUI_EDGES}

Expand All @@ -62,6 +64,8 @@ def __init__(
size=size,
names=names,
show_tooltips=show_tooltips,
custom_fonts=custom_fonts,
override_default_font=override_default_font,
)

self._imgui_renderer = ImguiRenderer(self.renderer.device, self.canvas)
Expand All @@ -82,18 +86,26 @@ def __init__(

io = imgui.get_io()

self._default_imgui_font = io.fonts.add_font_from_file_ttf(
sans_serif_font, 14, imgui.ImFontConfig()
)

font_config = imgui.ImFontConfig()
font_config.merge_mode = True
default_fonts = [(sans_serif_font, 14), (fa_6_fonts_path, 14.0)]
custom_fonts = custom_fonts if custom_fonts is not None else []

self._default_imgui_font = io.fonts.add_font_from_file_ttf(
fa_6_fonts_path,
14,
font_config,
)
if override_default_font:
font_list = custom_fonts + default_fonts
else:
font_list = default_fonts + custom_fonts

first_font = True
for font_path, font_size in font_list:
font_config = imgui.ImFontConfig()
font_config.merge_mode = not first_font
if first_font:
first_font = False

self._default_imgui_font = io.fonts.add_font_from_file_ttf(
font_path,
font_size,
font_config,
)

imgui.push_font(self._default_imgui_font, self._default_imgui_font.legacy_size)

Expand Down