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Added "justify" align for multiline text

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This commit is contained in:
Andrew Murray 2025-01-29 20:12:45 +11:00
parent 7093de46a7
commit 10eaff8ac7
4 changed files with 35 additions and 12 deletions
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3
Tests/test_imagefont.py
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@ -254,7 +254,8 @@ def test_render_multiline_text(font: ImageFont.FreeTypeFont) -> None:
@pytest.mark.parametrize( @pytest.mark.parametrize(
"align, ext", (("left", ""), ("center", "_center"), ("right", "_right")) "align, ext",
(("left", ""), ("center", "_center"), ("right", "_right"), ("justify", "_justify")),
) )
def test_render_multiline_text_align( def test_render_multiline_text_align(
font: ImageFont.FreeTypeFont, align: str, ext: str font: ImageFont.FreeTypeFont, align: str, ext: str

20
docs/reference/ImageDraw.rst
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@ -387,8 +387,9 @@ Methods
the number of pixels between lines. the number of pixels between lines.
:param align: If the text is passed on to :param align: If the text is passed on to
:py:meth:`~PIL.ImageDraw.ImageDraw.multiline_text`, :py:meth:`~PIL.ImageDraw.ImageDraw.multiline_text`,
``"left"``, ``"center"`` or ``"right"``. Determines the relative alignment of lines. ``"left"``, ``"center"``, ``"right"`` or ``"justify"``. Determines
Use the ``anchor`` parameter to specify the alignment to ``xy``. the relative alignment of lines. Use the ``anchor`` parameter to
specify the alignment to ``xy``.
:param direction: Direction of the text. It can be ``"rtl"`` (right to :param direction: Direction of the text. It can be ``"rtl"`` (right to
left), ``"ltr"`` (left to right) or ``"ttb"`` (top to bottom). left), ``"ltr"`` (left to right) or ``"ttb"`` (top to bottom).
Requires libraqm. Requires libraqm.
@ -455,8 +456,9 @@ Methods
of Pillow, but implemented only in version 8.0.0. of Pillow, but implemented only in version 8.0.0.
:param spacing: The number of pixels between lines. :param spacing: The number of pixels between lines.
:param align: ``"left"``, ``"center"`` or ``"right"``. Determines the relative alignment of lines. :param align: ``"left"``, ``"center"``, ``"right"`` or ``"justify"``. Determines
Use the ``anchor`` parameter to specify the alignment to ``xy``. the relative alignment of lines. Use the ``anchor`` parameter to
specify the alignment to ``xy``.
:param direction: Direction of the text. It can be ``"rtl"`` (right to :param direction: Direction of the text. It can be ``"rtl"`` (right to
left), ``"ltr"`` (left to right) or ``"ttb"`` (top to bottom). left), ``"ltr"`` (left to right) or ``"ttb"`` (top to bottom).
Requires libraqm. Requires libraqm.
@ -599,8 +601,9 @@ Methods
the number of pixels between lines. the number of pixels between lines.
:param align: If the text is passed on to :param align: If the text is passed on to
:py:meth:`~PIL.ImageDraw.ImageDraw.multiline_textbbox`, :py:meth:`~PIL.ImageDraw.ImageDraw.multiline_textbbox`,
``"left"``, ``"center"`` or ``"right"``. Determines the relative alignment of lines. ``"left"``, ``"center"``, ``"right"`` or ``"justify"``. Determines
Use the ``anchor`` parameter to specify the alignment to ``xy``. the relative alignment of lines. Use the ``anchor`` parameter to
specify the alignment to ``xy``.
:param direction: Direction of the text. It can be ``"rtl"`` (right to :param direction: Direction of the text. It can be ``"rtl"`` (right to
left), ``"ltr"`` (left to right) or ``"ttb"`` (top to bottom). left), ``"ltr"`` (left to right) or ``"ttb"`` (top to bottom).
Requires libraqm. Requires libraqm.
@ -650,8 +653,9 @@ Methods
vertical text. See :ref:`text-anchors` for details. vertical text. See :ref:`text-anchors` for details.
This parameter is ignored for non-TrueType fonts. This parameter is ignored for non-TrueType fonts.
:param spacing: The number of pixels between lines. :param spacing: The number of pixels between lines.
:param align: ``"left"``, ``"center"`` or ``"right"``. Determines the relative alignment of lines. :param align: ``"left"``, ``"center"``, ``"right"`` or ``"justify"``. Determines
Use the ``anchor`` parameter to specify the alignment to ``xy``. the relative alignment of lines. Use the ``anchor`` parameter to
specify the alignment to ``xy``.
:param direction: Direction of the text. It can be ``"rtl"`` (right to :param direction: Direction of the text. It can be ``"rtl"`` (right to
left), ``"ltr"`` (left to right) or ``"ttb"`` (top to bottom). left), ``"ltr"`` (left to right) or ``"ttb"`` (top to bottom).
Requires libraqm. Requires libraqm.

24
src/PIL/ImageDraw.py
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@ -761,17 +761,35 @@ class ImageDraw:
left -= width_difference left -= width_difference
# then align by align parameter # then align by align parameter
if align == "left": if align in ("left", "justify"):
pass pass
elif align == "center": elif align == "center":
left += width_difference / 2.0 left += width_difference / 2.0
elif align == "right": elif align == "right":
left += width_difference left += width_difference
else: else:
msg = 'align must be "left", "center" or "right"' msg = 'align must be "left", "center", "right" or "justify"'
raise ValueError(msg) raise ValueError(msg)
parts.append(((left, top), line)) if align == "justify" and width_difference != 0:
words = line.split(" " if isinstance(text, str) else b" ")
word_widths = [
self.textlength(
word,
font,
direction=direction,
features=features,
language=language,
embedded_color=embedded_color,
)
for word in words
]
width_difference = max_width - sum(word_widths)
for i, word in enumerate(words):
parts.append(((left, top), word))
left += word_widths[i] + width_difference / (len(words) - 1)
else:
parts.append(((left, top), line))
top += line_spacing top += line_spacing