Add Google-style docstrings for RTD API reference

src/palettes/__init__.py

@@ -1,12 +1,24 @@
 # SPDX-FileCopyrightText: 2024 Brad Barnett
 #
 # SPDX-License-Identifier: MIT
-"""
-`palettes`
-====================================================
+"""Color palette toolkit for pydisplay.
+
+Provides named color sets, RGB/HSV wheels, RGB cubes, and Material Design
+swatches. Palettes map integer indices to display-ready color values at
+several bit depths (4, 8, 16, or 24).
+
+Example:
+    >>> from palettes import get_palette
+    >>> palette = get_palette(name="wheel", length=256, saturation=1.0)
+    >>> palette[0]
+    >>> palette.color_name(0)
+
+Attributes:
+    WIN16: Mapping of ``0xRRGGBB`` values to Windows 16-color names. Used as
+        the default name table for :class:`Palette` and
+        :class:`~palettes.wheel.WheelPalette`.
 """
 
-# The 16 colors of the standard Windows 16-color palette
 WIN16 = {
     0x000000: "Black",
     0x000080: "Navy",
@@ -28,6 +40,21 @@
 
 
 def get_palette(name="default", **kwargs):
+    """Construct a palette by logical name.
+
+    Args:
+        name: Palette type. One of ``"default"`` (Windows 16-color),
+            ``"wheel"``, ``"cube"``, or ``"material_design"``. Unknown names
+            fall back to :class:`Palette`.
+        **kwargs: Forwarded to the palette constructor (for example
+            ``color_depth``, ``length``, ``size``, ``saturation``).
+
+    Returns:
+        A :class:`Palette` subclass instance.
+
+    Example:
+        >>> get_palette(name="cube", size=3, color_depth=16)
+    """
     if name == "wheel":
         from .wheel import WheelPalette as MyPalette
     elif name == "material_design":
@@ -40,8 +67,21 @@ def get_palette(name="default", **kwargs):
 
 
 class Palette:
-    """
-    A class to represent a color palette.
+    """Indexed color palette with optional named color attributes.
+
+    Subclasses override :meth:`_get_rgb` to define how each index maps to
+    red, green, and blue components. :meth:`__getitem__` converts those
+    components to the configured ``color_depth``.
+
+    Named colors from the palette's name table (for example ``palette.RED``)
+    are attached as attributes during initialization.
+
+    Args:
+        name: Optional label stored in :attr:`name`.
+        color_depth: Output format for :meth:`__getitem__`: ``4`` (24-bit
+            index), ``8`` (RGB332), ``16`` (RGB565), or ``24`` (``0xRRGGBB``).
+        swapped: If ``True``, byte-swap 16-bit colors (little-endian displays).
+        cached: If ``True``, memoize computed index colors in an internal dict.
     """
 
     def __init__(self, name="", color_depth=16, swapped=False, cached=False):
@@ -69,16 +109,32 @@ def _define_named_colors(self):
 
     @property
     def name(self):
+        """Human-readable palette label."""
         return self._name
 
     def __iter__(self):
+        """Yield each palette entry in index order."""
         for i in range(len(self)):
             yield self[i]
 
     def __len__(self):
+        """Number of colors in the palette."""
         return self._length
 
     def __getitem__(self, index):
+        """Return the color at ``index`` in the configured bit depth.
+
+        Negative indices and indices beyond the palette length wrap around.
+
+        Args:
+            index: Color index (supports negative and out-of-range values).
+
+        Returns:
+            Color value as an integer (format depends on ``color_depth``).
+
+        Raises:
+            ValueError: If ``color_depth`` is not 4, 8, 16, or 24.
+        """
         index = self._normalize(index)
 
         if self._cache is not None and index in self._cache:
@@ -101,6 +157,17 @@ def _normalize(self, index):
         return index
 
     def color565(self, r, g=None, b=None):
+        """Convert RGB to a 16-bit RGB565 value.
+
+        Args:
+            r: Red component (0–255), a 24-bit ``0xRRGGBB`` integer, or an
+                ``(r, g, b)`` sequence.
+            g: Green component when ``r`` is passed separately.
+            b: Blue component when ``r`` is passed separately.
+
+        Returns:
+            16-bit color, optionally byte-swapped when ``swapped`` is ``True``.
+        """
         if isinstance(r, (tuple, list)):
             # r is a tuple or list
             r, g, b = r
@@ -115,6 +182,17 @@ def color565(self, r, g=None, b=None):
             return color
 
     def color332(self, r, g=None, b=None):
+        """Convert RGB to an 8-bit RGB332 value.
+
+        Args:
+            r: Red component (0–255), a 24-bit ``0xRRGGBB`` integer, or an
+                ``(r, g, b)`` sequence.
+            g: Green component when ``r`` is passed separately.
+            b: Blue component when ``r`` is passed separately.
+
+        Returns:
+            8-bit RGB332 color.
+        """
         # Convert r, g, b to 8-bit
         if isinstance(r, (tuple, list)):
             # r is a tuple or list
@@ -127,8 +205,14 @@ def color332(self, r, g=None, b=None):
         return color
 
     def color_rgb(self, color):
-        """
-        color can be an 16-bit integer or a tuple, list or bytearray of length 2 or 3.
+        """Expand a packed color to an ``(r, g, b)`` tuple.
+
+        Args:
+            color: A 16-bit integer, or a 2- or 3-byte sequence in display
+                byte order.
+
+        Returns:
+            ``(red, green, blue)`` with each component in ``0``–``255``.
         """
         if isinstance(color, int):
             # convert 16-bit int color to 2 bytes
@@ -142,18 +226,53 @@ def color_rgb(self, color):
         return (r, g, b)
 
     def color_name(self, index):
+        """Return the name of the color at ``index``.
+
+        Args:
+            index: Palette index (supports wrapping).
+
+        Returns:
+            A name from the palette name table, or a ``"#RRGGBB"`` hex string
+            when no name matches.
+        """
         return self.rgb_name(self._get_rgb(self._normalize(index)))
 
     def rgb_name(self, r, g=None, b=None):
+        """Look up a color name from RGB components.
+
+        Args:
+            r: Red (0–255), a 24-bit integer, or an ``(r, g, b)`` sequence.
+            g: Green when ``r`` is passed separately.
+            b: Blue when ``r`` is passed separately.
+
+        Returns:
+            Matching name from :attr:`_names`, or ``"#RRGGBB"`` if unknown.
+        """
         if isinstance(r, (tuple, list)):
             r, g, b = r
         return self._names.get(r << 16 | g << 8 | b, f"#{r:02X}{g:02X}{b:02X}")
 
     def luminance(self, index):
+        """Perceived brightness of the color at ``index`` (ITU-R BT.601).
+
+        Args:
+            index: Palette index.
+
+        Returns:
+            Luminance in ``0.0``–``255.0``.
+        """
         r, g, b = self._get_rgb(index)
         return 0.299 * r + 0.587 * g + 0.114 * b
 
     def brightness(self, index):
+        """Average channel brightness of the color at ``index``.
+
+        Args:
+            index: Palette index.
+
+        Returns:
+            Normalized brightness in ``0.0``–``1.0``.
+        """
         r, g, b = self._get_rgb(index)
         return (r + g + b) / 3 / 255
 
@@ -163,8 +282,17 @@ def _get_rgb(self, index):
 
 
 class MappedPalette(Palette):
-    """
-    A class to represent a color palette with a color map.
+    """Palette backed by a flat RGB byte map.
+
+    Each color occupies three consecutive bytes ``(r, g, b)`` in
+    ``color_map``. Subclasses such as :class:`~palettes.material_design.MDPalette`
+    supply a pre-built map and named-color attributes.
+
+    Args:
+        name: Optional label stored in :attr:`name`.
+        color_depth: Output format for :meth:`Palette.__getitem__`.
+        swapped: Byte-swap 16-bit colors when ``True``.
+        color_map: ``bytes`` or buffer of RGB triplets, length ``3 * n_colors``.
     """
 
     def __init__(self, name, color_depth, swapped, color_map):

src/palettes/cube.py

@@ -1,32 +1,34 @@
-# SPDIX:# SPDX-FileCopyrightText: 2024 Brad Barnett
+# SPDX-FileCopyrightText: 2024 Brad Barnett
 #
 # SPDX-License-Identifier: MIT
-"""
-`palettes.cube`
-====================================================
-Makes a color cube palette.
-
-Usage:
-    from palettes import get_palette
-    palette = get_palette(name="cube", size=5, color_depth=16, swapped=False)
-    # OR
-    palette = get_palette(name="cube")
-
-    # OR
-    from palettes.cube import CubePalette
-    palette = CubePalette(size=5, color_depth=24)
-
-    print(f"Palette: {palette.name}, Length: {len(palette)}")
-    for i, color in enumerate(palette):
-        for i, color in enumerate(palette):  print(f"{i}. {color:#06X} {palette.color_name(i)}")
+"""RGB color-cube palettes.
+
+Samples the RGB cube at evenly spaced points. Supported cube sizes are
+2, 3, 4, and 5 (8, 27, 64, or 125 colors). Each size uses a built-in
+name table for :meth:`~palettes.Palette.color_name`.
+
+Example:
+    >>> from palettes import get_palette
+    >>> palette = get_palette(name="cube", size=5, color_depth=16)
+    >>> len(palette)
+    125
 """
 
 from . import Palette as _Palette
 
 
 class CubePalette(_Palette):
-    """
-    A color cube palette.  The size of the cube is determined by the size parameter.
+    """Evenly spaced RGB cube palette.
+
+    Indices traverse the cube in ``x``, then ``y``, then ``z`` order. Channel
+    values are spaced from ``0`` to ``255`` inclusive.
+
+    Args:
+        name: Prefix for :attr:`~palettes.Palette.name` (length suffix is added).
+        color_depth: Output format; see :class:`~palettes.Palette`.
+        swapped: Byte-swap 16-bit colors when ``True``.
+        cached: Memoize index lookups when ``True`` (default).
+        size: Cube edge length. Must be ``2``, ``3``, ``4``, or ``5``.
     """
 
     def __init__(self, name="", color_depth=16, swapped=False, cached=True, size=5):

src/palettes/material_design.py

@@ -1,50 +1,39 @@
 # SPDX-FileCopyrightText: 2024 Brad Barnett
 #
 # SPDX-License-Identifier: MIT
-"""
-`palettes.material_design`
-====================================================
-This module contains the Material Design color palette as a class object.
-
-
-Usage:
-    from palettes import get_palette
-    palette = get_palette(name="material_design", color_depth=16, swapped=False)
-    # OR
-    palette = get_palette("material_design")
-
-    # OR
-    from palettes.material_design import MDPalette
-    palette = MDPalette(size=5, color_depth=24)
-
-    # to access the primary variant of a color family by name:
-    x = palette.RED
-    x = palette.BLACK
+"""Material Design color palette.
 
-    # to access all 256 colors directly:
-    x = palette[127]  # color at index 127
+256 swatches from the Material Design spec, exposed as indexed colors and
+named attributes. Each hue family includes shades ``S50``–``S900``; most
+families also provide accent colors ``A100``, ``A200``, ``A400``, and
+``A700``.
 
-    # to access a shade by name:
-    x = palette.RED_S500  # shade 500
-    x = palette.RED_S900  # shade 900
-    x = palette.RED_S50  # shade 50
-
-    # to access an accent of a color family by name:
-    x = palette.RED_A100
-    x = palette.RED_A700
-
-    # to iterate over all 256 colors:
-        for x in palette:
-            pass
+Example:
+    >>> from palettes import get_palette
+    >>> palette = get_palette(name="material_design", color_depth=16)
+    >>> palette.RED
+    >>> palette.RED_S900
+    >>> palette[127]
 """
 
 from . import MappedPalette
 from ._material_design import COLORS, FAMILIES, LENGTHS
 
 
 class MDPalette(MappedPalette):
-    """
-    A class to represent the Material Design color palette.
+    """Material Design swatch palette.
+
+    Colors are stored in a flat RGB map. During initialization, named
+    attributes are created for each family and shade (for example
+    ``RED``, ``RED_S500``, ``RED_A700``). The unsuffixed name always
+    refers to the ``S500`` primary shade.
+
+    Args:
+        name: Label for :attr:`~palettes.Palette.name`; defaults to
+            ``"MaterialDesign"`` when empty.
+        color_depth: Output format; see :class:`~palettes.Palette`.
+        swapped: Byte-swap 16-bit colors when ``True``.
+        color_map: RGB byte map; defaults to the built-in Material Design table.
     """
 
     _shades = [