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252 lines
8.0 KiB
Python
252 lines
8.0 KiB
Python
from typing import Self
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import copy
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import numpy
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from numpy import pi, nan
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from numpy.typing import NDArray, ArrayLike
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from . import Shape, Polygon, normalized_shape_tuple
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from ..error import PatternError
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from ..repetition import Repetition
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from ..traits import RotatableImpl
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from ..utils import is_scalar, get_bit, annotations_t
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# Loaded on use:
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# from freetype import Face
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# from matplotlib.path import Path
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class Text(RotatableImpl, Shape):
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"""
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Text (to be printed e.g. as a set of polygons).
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This is distinct from non-printed Label objects.
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"""
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__slots__ = (
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'_string', '_height', '_mirrored', 'font_path',
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# Inherited
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'_offset', '_repetition', '_annotations', '_rotation',
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)
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_string: str
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_height: float
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_mirrored: bool
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font_path: str
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# vertices property
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@property
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def string(self) -> str:
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return self._string
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@string.setter
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def string(self, val: str) -> None:
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self._string = val
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# Height property
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@property
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def height(self) -> float:
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return self._height
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@height.setter
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def height(self, val: float) -> None:
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if not is_scalar(val):
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raise PatternError('Height must be a scalar')
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self._height = val
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@property
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def mirrored(self) -> bool: # mypy#3004, should be bool
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return self._mirrored
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@mirrored.setter
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def mirrored(self, val: bool) -> None:
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self._mirrored = bool(val)
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def __init__(
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self,
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string: str,
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height: float,
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font_path: str,
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*,
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offset: ArrayLike = (0.0, 0.0),
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rotation: float = 0.0,
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repetition: Repetition | None = None,
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annotations: annotations_t | None = None,
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raw: bool = False,
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) -> None:
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if raw:
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assert isinstance(offset, numpy.ndarray)
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self._offset = offset
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self._string = string
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self._height = height
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self._rotation = rotation
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self._repetition = repetition
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self._annotations = annotations if annotations is not None else {}
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else:
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self.offset = offset
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self.string = string
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self.height = height
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self.rotation = rotation
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self.repetition = repetition
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self.annotations = annotations if annotations is not None else {}
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self.font_path = font_path
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def __deepcopy__(self, memo: dict | None = None) -> Self:
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memo = {} if memo is None else memo
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new = copy.copy(self)
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new._offset = self._offset.copy()
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new._annotations = copy.deepcopy(self._annotations)
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return new
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def to_polygons(
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self,
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num_vertices: int | None = None, # unused
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max_arclen: float | None = None, # unused
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) -> list[Polygon]:
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all_polygons = []
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total_advance = 0.0
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for char in self.string:
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raw_polys, advance = get_char_as_polygons(self.font_path, char)
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# Move these polygons to the right of the previous letter
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for xys in raw_polys:
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poly = Polygon(xys)
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if self.mirrored:
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poly.mirror()
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poly.scale_by(self.height)
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poly.offset = self.offset + [total_advance, 0]
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poly.rotate_around(self.offset, self.rotation)
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all_polygons += [poly]
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# Update the list of all polygons and how far to advance
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total_advance += advance * self.height
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return all_polygons
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def mirror(self, axis: int = 0) -> Self:
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self.mirrored = not self.mirrored
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if axis == 1:
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self.rotation += pi
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return self
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def scale_by(self, c: float) -> Self:
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self.height *= c
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return self
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def normalized_form(self, norm_value: float) -> normalized_shape_tuple:
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rotation = self.rotation % (2 * pi)
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return ((type(self), self.string, self.font_path),
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(self.offset, self.height / norm_value, rotation, bool(self.mirrored)),
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lambda: Text(
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string=self.string,
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height=self.height * norm_value,
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font_path=self.font_path,
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rotation=rotation,
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).mirror2d(across_x=self.mirrored),
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)
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def get_bounds_single(self) -> NDArray[numpy.float64]:
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# rotation makes this a huge pain when using slot.advance and glyph.bbox(), so
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# just convert to polygons instead
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polys = self.to_polygons()
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pbounds = numpy.full((len(polys), 2, 2), nan)
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for pp, poly in enumerate(polys):
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pbounds[pp] = poly.get_bounds_nonempty()
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bounds = numpy.vstack((
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numpy.min(pbounds[: 0, :], axis=0),
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numpy.max(pbounds[: 1, :], axis=0),
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))
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return bounds
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def get_char_as_polygons(
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font_path: str,
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char: str,
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resolution: float = 48 * 64,
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) -> tuple[list[list[list[float]]], float]:
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from freetype import Face # type: ignore
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from matplotlib.path import Path # type: ignore
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"""
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Get a list of polygons representing a single character.
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The output is normalized so that the font size is 1 unit.
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Args:
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font_path: File path specifying a font loadable by freetype
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char: Character to convert to polygons
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resolution: Internal resolution setting (used for freetype
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`Face.set_font_size(resolution))`. Modify at your own peril!
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Returns:
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List of polygons `[[[x0, y0], [x1, y1], ...], ...]` and
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'advance' distance (distance from the start of this glyph to the start of the next one)
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"""
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if len(char) != 1:
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raise Exception('get_char_as_polygons called with non-char')
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face = Face(font_path)
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face.set_char_size(resolution)
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face.load_char(char)
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slot = face.glyph
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outline = slot.outline
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start = 0
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all_verts_list, all_codes = [], []
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for end in outline.contours:
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points = outline.points[start:end + 1]
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points.append(points[0])
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tags = outline.tags[start:end + 1]
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tags.append(tags[0])
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segments: list[list[list[float]]] = []
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for j, point in enumerate(points):
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# If we already have a segment, add this point to it
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if j > 0:
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segments[-1].append(point)
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# If not bezier control point, start next segment
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if get_bit(tags[j], 0) and j < (len(points) - 1):
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segments.append([point])
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verts = [points[0]]
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codes = [Path.MOVETO]
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for segment in segments:
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if len(segment) == 2:
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verts.extend(segment[1:])
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codes.extend([Path.LINETO])
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elif len(segment) == 3:
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verts.extend(segment[1:])
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codes.extend([Path.CURVE3, Path.CURVE3])
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else:
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verts.append(segment[1])
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codes.append(Path.CURVE3)
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for i in range(1, len(segment) - 2):
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a, b = segment[i], segment[i + 1]
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c = ((a[0] + b[0]) / 2.0, (a[1] + b[1]) / 2.0)
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verts.extend([c, b])
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codes.extend([Path.CURVE3, Path.CURVE3])
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verts.append(segment[-1])
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codes.append(Path.CURVE3)
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all_verts_list.extend(verts)
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all_codes.extend(codes)
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start = end + 1
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all_verts = numpy.array(all_verts_list) / resolution
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advance = slot.advance.x / resolution
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if len(all_verts) == 0:
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polygons = []
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else:
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path = Path(all_verts, all_codes)
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path.should_simplify = False
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polygons = path.to_polygons()
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return polygons, advance
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def __repr__(self) -> str:
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rotation = f' r°{numpy.rad2deg(self.rotation):g}' if self.rotation != 0 else ''
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mirrored = ' m{:d}' if self.mirrored else ''
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return f'<TextShape "{self.string}" o{self.offset} h{self.height:g}{rotation}{mirrored}>'
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