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from __future__ import annotations
from typing import TYPE_CHECKING, cast
import numpy as np
from contourpy._contourpy import FillType, LineType
import contourpy.array as arr
from contourpy.enum_util import as_fill_type, as_line_type
from contourpy.typecheck import check_filled, check_lines
from contourpy.types import MOVETO, offset_dtype
if TYPE_CHECKING:
import contourpy._contourpy as cpy
def _convert_filled_from_OuterCode(
filled: cpy.FillReturn_OuterCode,
fill_type_to: FillType,
) -> cpy.FillReturn:
if fill_type_to == FillType.OuterCode:
return filled
elif fill_type_to == FillType.OuterOffset:
return (filled[0], [arr.offsets_from_codes(codes) for codes in filled[1]])
if len(filled[0]) > 0:
points = arr.concat_points(filled[0])
codes = arr.concat_codes(filled[1])
else:
points = None
codes = None
if fill_type_to == FillType.ChunkCombinedCode:
return ([points], [codes])
elif fill_type_to == FillType.ChunkCombinedOffset:
return ([points], [None if codes is None else arr.offsets_from_codes(codes)])
elif fill_type_to == FillType.ChunkCombinedCodeOffset:
outer_offsets = None if points is None else arr.offsets_from_lengths(filled[0])
ret1: cpy.FillReturn_ChunkCombinedCodeOffset = ([points], [codes], [outer_offsets])
return ret1
elif fill_type_to == FillType.ChunkCombinedOffsetOffset:
if codes is None:
ret2: cpy.FillReturn_ChunkCombinedOffsetOffset = ([None], [None], [None])
else:
offsets = arr.offsets_from_codes(codes)
outer_offsets = arr.outer_offsets_from_list_of_codes(filled[1])
ret2 = ([points], [offsets], [outer_offsets])
return ret2
else:
raise ValueError(f"Invalid FillType {fill_type_to}")
def _convert_filled_from_OuterOffset(
filled: cpy.FillReturn_OuterOffset,
fill_type_to: FillType,
) -> cpy.FillReturn:
if fill_type_to == FillType.OuterCode:
separate_codes = [arr.codes_from_offsets(offsets) for offsets in filled[1]]
return (filled[0], separate_codes)
elif fill_type_to == FillType.OuterOffset:
return filled
if len(filled[0]) > 0:
points = arr.concat_points(filled[0])
offsets = arr.concat_offsets(filled[1])
else:
points = None
offsets = None
if fill_type_to == FillType.ChunkCombinedCode:
return ([points], [None if offsets is None else arr.codes_from_offsets(offsets)])
elif fill_type_to == FillType.ChunkCombinedOffset:
return ([points], [offsets])
elif fill_type_to == FillType.ChunkCombinedCodeOffset:
if offsets is None:
ret1: cpy.FillReturn_ChunkCombinedCodeOffset = ([None], [None], [None])
else:
codes = arr.codes_from_offsets(offsets)
outer_offsets = arr.offsets_from_lengths(filled[0])
ret1 = ([points], [codes], [outer_offsets])
return ret1
elif fill_type_to == FillType.ChunkCombinedOffsetOffset:
if points is None:
ret2: cpy.FillReturn_ChunkCombinedOffsetOffset = ([None], [None], [None])
else:
outer_offsets = arr.outer_offsets_from_list_of_offsets(filled[1])
ret2 = ([points], [offsets], [outer_offsets])
return ret2
else:
raise ValueError(f"Invalid FillType {fill_type_to}")
def _convert_filled_from_ChunkCombinedCode(
filled: cpy.FillReturn_ChunkCombinedCode,
fill_type_to: FillType,
) -> cpy.FillReturn:
if fill_type_to == FillType.ChunkCombinedCode:
return filled
elif fill_type_to == FillType.ChunkCombinedOffset:
codes = [None if codes is None else arr.offsets_from_codes(codes) for codes in filled[1]]
return (filled[0], codes)
else:
raise ValueError(
f"Conversion from {FillType.ChunkCombinedCode} to {fill_type_to} not supported")
def _convert_filled_from_ChunkCombinedOffset(
filled: cpy.FillReturn_ChunkCombinedOffset,
fill_type_to: FillType,
) -> cpy.FillReturn:
if fill_type_to == FillType.ChunkCombinedCode:
chunk_codes: list[cpy.CodeArray | None] = []
for points, offsets in zip(*filled):
if points is None:
chunk_codes.append(None)
else:
if TYPE_CHECKING:
assert offsets is not None
chunk_codes.append(arr.codes_from_offsets_and_points(offsets, points))
return (filled[0], chunk_codes)
elif fill_type_to == FillType.ChunkCombinedOffset:
return filled
else:
raise ValueError(
f"Conversion from {FillType.ChunkCombinedOffset} to {fill_type_to} not supported")
def _convert_filled_from_ChunkCombinedCodeOffset(
filled: cpy.FillReturn_ChunkCombinedCodeOffset,
fill_type_to: FillType,
) -> cpy.FillReturn:
if fill_type_to == FillType.OuterCode:
separate_points = []
separate_codes = []
for points, codes, outer_offsets in zip(*filled):
if points is not None:
if TYPE_CHECKING:
assert codes is not None
assert outer_offsets is not None
separate_points += arr.split_points_by_offsets(points, outer_offsets)
separate_codes += arr.split_codes_by_offsets(codes, outer_offsets)
return (separate_points, separate_codes)
elif fill_type_to == FillType.OuterOffset:
separate_points = []
separate_offsets = []
for points, codes, outer_offsets in zip(*filled):
if points is not None:
if TYPE_CHECKING:
assert codes is not None
assert outer_offsets is not None
separate_points += arr.split_points_by_offsets(points, outer_offsets)
separate_codes = arr.split_codes_by_offsets(codes, outer_offsets)
separate_offsets += [arr.offsets_from_codes(codes) for codes in separate_codes]
return (separate_points, separate_offsets)
elif fill_type_to == FillType.ChunkCombinedCode:
ret1: cpy.FillReturn_ChunkCombinedCode = (filled[0], filled[1])
return ret1
elif fill_type_to == FillType.ChunkCombinedOffset:
all_offsets = [None if codes is None else arr.offsets_from_codes(codes)
for codes in filled[1]]
ret2: cpy.FillReturn_ChunkCombinedOffset = (filled[0], all_offsets)
return ret2
elif fill_type_to == FillType.ChunkCombinedCodeOffset:
return filled
elif fill_type_to == FillType.ChunkCombinedOffsetOffset:
chunk_offsets: list[cpy.OffsetArray | None] = []
chunk_outer_offsets: list[cpy.OffsetArray | None] = []
for codes, outer_offsets in zip(*filled[1:]):
if codes is None:
chunk_offsets.append(None)
chunk_outer_offsets.append(None)
else:
if TYPE_CHECKING:
assert outer_offsets is not None
offsets = arr.offsets_from_codes(codes)
outer_offsets = np.array([np.nonzero(offsets == oo)[0][0] for oo in outer_offsets],
dtype=offset_dtype)
chunk_offsets.append(offsets)
chunk_outer_offsets.append(outer_offsets)
ret3: cpy.FillReturn_ChunkCombinedOffsetOffset = (
filled[0], chunk_offsets, chunk_outer_offsets,
)
return ret3
else:
raise ValueError(f"Invalid FillType {fill_type_to}")
def _convert_filled_from_ChunkCombinedOffsetOffset(
filled: cpy.FillReturn_ChunkCombinedOffsetOffset,
fill_type_to: FillType,
) -> cpy.FillReturn:
if fill_type_to == FillType.OuterCode:
separate_points = []
separate_codes = []
for points, offsets, outer_offsets in zip(*filled):
if points is not None:
if TYPE_CHECKING:
assert offsets is not None
assert outer_offsets is not None
codes = arr.codes_from_offsets_and_points(offsets, points)
outer_offsets = offsets[outer_offsets]
separate_points += arr.split_points_by_offsets(points, outer_offsets)
separate_codes += arr.split_codes_by_offsets(codes, outer_offsets)
return (separate_points, separate_codes)
elif fill_type_to == FillType.OuterOffset:
separate_points = []
separate_offsets = []
for points, offsets, outer_offsets in zip(*filled):
if points is not None:
if TYPE_CHECKING:
assert offsets is not None
assert outer_offsets is not None
if len(outer_offsets) > 2:
separate_offsets += [offsets[s:e+1] - offsets[s] for s, e in
zip(outer_offsets[:-1], outer_offsets[1:])]
else:
separate_offsets.append(offsets)
separate_points += arr.split_points_by_offsets(points, offsets[outer_offsets])
return (separate_points, separate_offsets)
elif fill_type_to == FillType.ChunkCombinedCode:
chunk_codes: list[cpy.CodeArray | None] = []
for points, offsets, outer_offsets in zip(*filled):
if points is None:
chunk_codes.append(None)
else:
if TYPE_CHECKING:
assert offsets is not None
assert outer_offsets is not None
chunk_codes.append(arr.codes_from_offsets_and_points(offsets, points))
ret1: cpy.FillReturn_ChunkCombinedCode = (filled[0], chunk_codes)
return ret1
elif fill_type_to == FillType.ChunkCombinedOffset:
return (filled[0], filled[1])
elif fill_type_to == FillType.ChunkCombinedCodeOffset:
chunk_codes = []
chunk_outer_offsets: list[cpy.OffsetArray | None] = []
for points, offsets, outer_offsets in zip(*filled):
if points is None:
chunk_codes.append(None)
chunk_outer_offsets.append(None)
else:
if TYPE_CHECKING:
assert offsets is not None
assert outer_offsets is not None
chunk_codes.append(arr.codes_from_offsets_and_points(offsets, points))
chunk_outer_offsets.append(offsets[outer_offsets])
ret2: cpy.FillReturn_ChunkCombinedCodeOffset = (filled[0], chunk_codes, chunk_outer_offsets)
return ret2
elif fill_type_to == FillType.ChunkCombinedOffsetOffset:
return filled
else:
raise ValueError(f"Invalid FillType {fill_type_to}")
def convert_filled(
filled: cpy.FillReturn,
fill_type_from: FillType | str,
fill_type_to: FillType | str,
) -> cpy.FillReturn:
"""Return the specified filled contours converted to a different :class:`~contourpy.FillType`.
Args:
filled (sequence of arrays): Filled contour polygons to convert.
fill_type_from (FillType or str): :class:`~contourpy.FillType` to convert from as enum or
string equivalent.
fill_type_to (FillType or str): :class:`~contourpy.FillType` to convert to as enum or string
equivalent.
Return:
Converted filled contour polygons.
When converting non-chunked fill types (``FillType.OuterCode`` or ``FillType.OuterOffset``) to
chunked ones, all polygons are placed in the first chunk. When converting in the other
direction, all chunk information is discarded. Converting a fill type that is not aware of the
relationship between outer boundaries and contained holes (``FillType.ChunkCombinedCode`` or)
``FillType.ChunkCombinedOffset``) to one that is will raise a ``ValueError``.
.. versionadded:: 1.2.0
"""
fill_type_from = as_fill_type(fill_type_from)
fill_type_to = as_fill_type(fill_type_to)
check_filled(filled, fill_type_from)
if fill_type_from == FillType.OuterCode:
if TYPE_CHECKING:
filled = cast(cpy.FillReturn_OuterCode, filled)
return _convert_filled_from_OuterCode(filled, fill_type_to)
elif fill_type_from == FillType.OuterOffset:
if TYPE_CHECKING:
filled = cast(cpy.FillReturn_OuterOffset, filled)
return _convert_filled_from_OuterOffset(filled, fill_type_to)
elif fill_type_from == FillType.ChunkCombinedCode:
if TYPE_CHECKING:
filled = cast(cpy.FillReturn_ChunkCombinedCode, filled)
return _convert_filled_from_ChunkCombinedCode(filled, fill_type_to)
elif fill_type_from == FillType.ChunkCombinedOffset:
if TYPE_CHECKING:
filled = cast(cpy.FillReturn_ChunkCombinedOffset, filled)
return _convert_filled_from_ChunkCombinedOffset(filled, fill_type_to)
elif fill_type_from == FillType.ChunkCombinedCodeOffset:
if TYPE_CHECKING:
filled = cast(cpy.FillReturn_ChunkCombinedCodeOffset, filled)
return _convert_filled_from_ChunkCombinedCodeOffset(filled, fill_type_to)
elif fill_type_from == FillType.ChunkCombinedOffsetOffset:
if TYPE_CHECKING:
filled = cast(cpy.FillReturn_ChunkCombinedOffsetOffset, filled)
return _convert_filled_from_ChunkCombinedOffsetOffset(filled, fill_type_to)
else:
raise ValueError(f"Invalid FillType {fill_type_from}")
def _convert_lines_from_Separate(
lines: cpy.LineReturn_Separate,
line_type_to: LineType,
) -> cpy.LineReturn:
if line_type_to == LineType.Separate:
return lines
elif line_type_to == LineType.SeparateCode:
separate_codes = [arr.codes_from_points(line) for line in lines]
return (lines, separate_codes)
elif line_type_to == LineType.ChunkCombinedCode:
if not lines:
ret1: cpy.LineReturn_ChunkCombinedCode = ([None], [None])
else:
points = arr.concat_points(lines)
offsets = arr.offsets_from_lengths(lines)
codes = arr.codes_from_offsets_and_points(offsets, points)
ret1 = ([points], [codes])
return ret1
elif line_type_to == LineType.ChunkCombinedOffset:
if not lines:
ret2: cpy.LineReturn_ChunkCombinedOffset = ([None], [None])
else:
ret2 = ([arr.concat_points(lines)], [arr.offsets_from_lengths(lines)])
return ret2
elif line_type_to == LineType.ChunkCombinedNan:
if not lines:
ret3: cpy.LineReturn_ChunkCombinedNan = ([None],)
else:
ret3 = ([arr.concat_points_with_nan(lines)],)
return ret3
else:
raise ValueError(f"Invalid LineType {line_type_to}")
def _convert_lines_from_SeparateCode(
lines: cpy.LineReturn_SeparateCode,
line_type_to: LineType,
) -> cpy.LineReturn:
if line_type_to == LineType.Separate:
# Drop codes.
return lines[0]
elif line_type_to == LineType.SeparateCode:
return lines
elif line_type_to == LineType.ChunkCombinedCode:
if not lines[0]:
ret1: cpy.LineReturn_ChunkCombinedCode = ([None], [None])
else:
ret1 = ([arr.concat_points(lines[0])], [arr.concat_codes(lines[1])])
return ret1
elif line_type_to == LineType.ChunkCombinedOffset:
if not lines[0]:
ret2: cpy.LineReturn_ChunkCombinedOffset = ([None], [None])
else:
ret2 = ([arr.concat_points(lines[0])], [arr.offsets_from_lengths(lines[0])])
return ret2
elif line_type_to == LineType.ChunkCombinedNan:
if not lines[0]:
ret3: cpy.LineReturn_ChunkCombinedNan = ([None],)
else:
ret3 = ([arr.concat_points_with_nan(lines[0])],)
return ret3
else:
raise ValueError(f"Invalid LineType {line_type_to}")
def _convert_lines_from_ChunkCombinedCode(
lines: cpy.LineReturn_ChunkCombinedCode,
line_type_to: LineType,
) -> cpy.LineReturn:
if line_type_to in (LineType.Separate, LineType.SeparateCode):
separate_lines = []
for points, codes in zip(*lines):
if points is not None:
if TYPE_CHECKING:
assert codes is not None
split_at = np.nonzero(codes == MOVETO)[0]
if len(split_at) > 1:
separate_lines += np.split(points, split_at[1:])
else:
separate_lines.append(points)
if line_type_to == LineType.Separate:
return separate_lines
else:
separate_codes = [arr.codes_from_points(line) for line in separate_lines]
return (separate_lines, separate_codes)
elif line_type_to == LineType.ChunkCombinedCode:
return lines
elif line_type_to == LineType.ChunkCombinedOffset:
chunk_offsets = [None if codes is None else arr.offsets_from_codes(codes)
for codes in lines[1]]
return (lines[0], chunk_offsets)
elif line_type_to == LineType.ChunkCombinedNan:
points_nan: list[cpy.PointArray | None] = []
for points, codes in zip(*lines):
if points is None:
points_nan.append(None)
else:
if TYPE_CHECKING:
assert codes is not None
offsets = arr.offsets_from_codes(codes)
points_nan.append(arr.insert_nan_at_offsets(points, offsets))
return (points_nan,)
else:
raise ValueError(f"Invalid LineType {line_type_to}")
def _convert_lines_from_ChunkCombinedOffset(
lines: cpy.LineReturn_ChunkCombinedOffset,
line_type_to: LineType,
) -> cpy.LineReturn:
if line_type_to in (LineType.Separate, LineType.SeparateCode):
separate_lines = []
for points, offsets in zip(*lines):
if points is not None:
if TYPE_CHECKING:
assert offsets is not None
separate_lines += arr.split_points_by_offsets(points, offsets)
if line_type_to == LineType.Separate:
return separate_lines
else:
separate_codes = [arr.codes_from_points(line) for line in separate_lines]
return (separate_lines, separate_codes)
elif line_type_to == LineType.ChunkCombinedCode:
chunk_codes: list[cpy.CodeArray | None] = []
for points, offsets in zip(*lines):
if points is None:
chunk_codes.append(None)
else:
if TYPE_CHECKING:
assert offsets is not None
chunk_codes.append(arr.codes_from_offsets_and_points(offsets, points))
return (lines[0], chunk_codes)
elif line_type_to == LineType.ChunkCombinedOffset:
return lines
elif line_type_to == LineType.ChunkCombinedNan:
points_nan: list[cpy.PointArray | None] = []
for points, offsets in zip(*lines):
if points is None:
points_nan.append(None)
else:
if TYPE_CHECKING:
assert offsets is not None
points_nan.append(arr.insert_nan_at_offsets(points, offsets))
return (points_nan,)
else:
raise ValueError(f"Invalid LineType {line_type_to}")
def _convert_lines_from_ChunkCombinedNan(
lines: cpy.LineReturn_ChunkCombinedNan,
line_type_to: LineType,
) -> cpy.LineReturn:
if line_type_to in (LineType.Separate, LineType.SeparateCode):
separate_lines = []
for points in lines[0]:
if points is not None:
separate_lines += arr.split_points_at_nan(points)
if line_type_to == LineType.Separate:
return separate_lines
else:
separate_codes = [arr.codes_from_points(points) for points in separate_lines]
return (separate_lines, separate_codes)
elif line_type_to == LineType.ChunkCombinedCode:
chunk_points: list[cpy.PointArray | None] = []
chunk_codes: list[cpy.CodeArray | None] = []
for points in lines[0]:
if points is None:
chunk_points.append(None)
chunk_codes.append(None)
else:
points, offsets = arr.remove_nan(points)
chunk_points.append(points)
chunk_codes.append(arr.codes_from_offsets_and_points(offsets, points))
return (chunk_points, chunk_codes)
elif line_type_to == LineType.ChunkCombinedOffset:
chunk_points = []
chunk_offsets: list[cpy.OffsetArray | None] = []
for points in lines[0]:
if points is None:
chunk_points.append(None)
chunk_offsets.append(None)
else:
points, offsets = arr.remove_nan(points)
chunk_points.append(points)
chunk_offsets.append(offsets)
return (chunk_points, chunk_offsets)
elif line_type_to == LineType.ChunkCombinedNan:
return lines
else:
raise ValueError(f"Invalid LineType {line_type_to}")
def convert_lines(
lines: cpy.LineReturn,
line_type_from: LineType | str,
line_type_to: LineType | str,
) -> cpy.LineReturn:
"""Return the specified contour lines converted to a different :class:`~contourpy.LineType`.
Args:
lines (sequence of arrays): Contour lines to convert.
line_type_from (LineType or str): :class:`~contourpy.LineType` to convert from as enum or
string equivalent.
line_type_to (LineType or str): :class:`~contourpy.LineType` to convert to as enum or string
equivalent.
Return:
Converted contour lines.
When converting non-chunked line types (``LineType.Separate`` or ``LineType.SeparateCode``) to
chunked ones (``LineType.ChunkCombinedCode``, ``LineType.ChunkCombinedOffset`` or
``LineType.ChunkCombinedNan``), all lines are placed in the first chunk. When converting in the
other direction, all chunk information is discarded.
.. versionadded:: 1.2.0
"""
line_type_from = as_line_type(line_type_from)
line_type_to = as_line_type(line_type_to)
check_lines(lines, line_type_from)
if line_type_from == LineType.Separate:
if TYPE_CHECKING:
lines = cast(cpy.LineReturn_Separate, lines)
return _convert_lines_from_Separate(lines, line_type_to)
elif line_type_from == LineType.SeparateCode:
if TYPE_CHECKING:
lines = cast(cpy.LineReturn_SeparateCode, lines)
return _convert_lines_from_SeparateCode(lines, line_type_to)
elif line_type_from == LineType.ChunkCombinedCode:
if TYPE_CHECKING:
lines = cast(cpy.LineReturn_ChunkCombinedCode, lines)
return _convert_lines_from_ChunkCombinedCode(lines, line_type_to)
elif line_type_from == LineType.ChunkCombinedOffset:
if TYPE_CHECKING:
lines = cast(cpy.LineReturn_ChunkCombinedOffset, lines)
return _convert_lines_from_ChunkCombinedOffset(lines, line_type_to)
elif line_type_from == LineType.ChunkCombinedNan:
if TYPE_CHECKING:
lines = cast(cpy.LineReturn_ChunkCombinedNan, lines)
return _convert_lines_from_ChunkCombinedNan(lines, line_type_to)
else:
raise ValueError(f"Invalid LineType {line_type_from}")
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