135 lines
4.1 KiB
Python
135 lines
4.1 KiB
Python
# Copyright (c) 2019-2021 Manfred Moitzi
|
|
# License: MIT License
|
|
from __future__ import annotations
|
|
from typing import Iterable, TYPE_CHECKING, Optional
|
|
|
|
from ezdxf.lldxf.tags import Tags, group_tags
|
|
from ezdxf.math import Vec2, UVec
|
|
from ezdxf.tools import pattern
|
|
|
|
if TYPE_CHECKING:
|
|
from ezdxf.lldxf.tagwriter import AbstractTagWriter
|
|
|
|
__all__ = ["Pattern", "PatternLine"]
|
|
|
|
|
|
class Pattern:
|
|
def __init__(self, lines: Optional[Iterable[PatternLine]] = None):
|
|
self.lines: list[PatternLine] = list(lines) if lines else []
|
|
|
|
@classmethod
|
|
def load_tags(cls, tags: Tags) -> Pattern:
|
|
grouped_line_tags = group_tags(tags, splitcode=53)
|
|
return cls(
|
|
PatternLine.load_tags(line_tags) for line_tags in grouped_line_tags
|
|
)
|
|
|
|
def clear(self) -> None:
|
|
"""Delete all pattern definition lines."""
|
|
self.lines = []
|
|
|
|
def add_line(
|
|
self,
|
|
angle: float = 0,
|
|
base_point: UVec = (0, 0),
|
|
offset: UVec = (0, 0),
|
|
dash_length_items: Optional[Iterable[float]] = None,
|
|
) -> None:
|
|
"""Create a new pattern definition line and add the line to the
|
|
:attr:`Pattern.lines` attribute.
|
|
|
|
"""
|
|
assert (
|
|
dash_length_items is not None
|
|
), "argument 'dash_length_items' is None"
|
|
self.lines.append(
|
|
PatternLine(angle, base_point, offset, dash_length_items)
|
|
)
|
|
|
|
def export_dxf(self, tagwriter: AbstractTagWriter, force=False) -> None:
|
|
if len(self.lines) or force:
|
|
tagwriter.write_tag2(78, len(self.lines))
|
|
for line in self.lines:
|
|
line.export_dxf(tagwriter)
|
|
|
|
def __str__(self) -> str:
|
|
return "[" + ",".join(str(line) for line in self.lines) + "]"
|
|
|
|
def as_list(self) -> list:
|
|
return [line.as_list() for line in self.lines]
|
|
|
|
def scale(self, factor: float = 1, angle: float = 0) -> None:
|
|
"""Scale and rotate pattern.
|
|
|
|
Be careful, this changes the base pattern definition, maybe better use
|
|
:meth:`Hatch.set_pattern_scale` or :meth:`Hatch.set_pattern_angle`.
|
|
|
|
Args:
|
|
factor: scaling factor
|
|
angle: rotation angle in degrees
|
|
|
|
"""
|
|
scaled_pattern = pattern.scale_pattern(
|
|
self.as_list(), factor=factor, angle=angle
|
|
)
|
|
self.clear()
|
|
for line in scaled_pattern:
|
|
self.add_line(*line)
|
|
|
|
|
|
class PatternLine:
|
|
def __init__(
|
|
self,
|
|
angle: float = 0,
|
|
base_point: UVec = (0, 0),
|
|
offset: UVec = (0, 0),
|
|
dash_length_items: Optional[Iterable[float]] = None,
|
|
):
|
|
self.angle: float = float(angle) # in degrees
|
|
self.base_point: Vec2 = Vec2(base_point)
|
|
self.offset: Vec2 = Vec2(offset)
|
|
self.dash_length_items: list[float] = (
|
|
[] if dash_length_items is None else list(dash_length_items)
|
|
)
|
|
# dash_length_items = [item0, item1, ...]
|
|
# item > 0 is line, < 0 is gap, 0.0 = dot;
|
|
|
|
@staticmethod
|
|
def load_tags(tags: Tags) -> PatternLine:
|
|
p = {53: 0, 43: 0, 44: 0, 45: 0, 46: 0}
|
|
dash_length_items = []
|
|
for tag in tags:
|
|
code, value = tag
|
|
if code == 49:
|
|
dash_length_items.append(value)
|
|
else:
|
|
p[code] = value
|
|
return PatternLine(
|
|
p[53], (p[43], p[44]), (p[45], p[46]), dash_length_items
|
|
)
|
|
|
|
def export_dxf(self, tagwriter: AbstractTagWriter) -> None:
|
|
write_tag = tagwriter.write_tag2
|
|
write_tag(53, self.angle)
|
|
write_tag(43, self.base_point.x)
|
|
write_tag(44, self.base_point.y)
|
|
write_tag(45, self.offset.x)
|
|
write_tag(46, self.offset.y)
|
|
write_tag(79, len(self.dash_length_items))
|
|
for item in self.dash_length_items:
|
|
write_tag(49, item)
|
|
|
|
def __str__(self):
|
|
return (
|
|
f"[{self.angle}, {self.base_point}, {self.offset}, "
|
|
f"{self.dash_length_items}]"
|
|
)
|
|
|
|
def as_list(self) -> list:
|
|
return [
|
|
self.angle,
|
|
self.base_point,
|
|
self.offset,
|
|
self.dash_length_items,
|
|
]
|