def _get_extra_transform(text: AnyText) -> Matrix44:
extra_transform = Matrix44()
if isinstance(text, Text):
# ALIGNED: scaled to fit in the text box (aspect ratio preserved). Does not have to be handled specially.
# FIT: scaled to fit in the text box (aspect ratio *not* preserved). Handled by dxf.width
scale_x = text.dxf.width # 'width' is the width *scale factor* so 1.0 by default
scale_y = 1
if text.dxf.text_generation_flag & DXFConstants.MIRROR_X:
scale_x *= -1
if text.dxf.text_generation_flag & DXFConstants.MIRROR_Y:
scale_y *= -1
# magnitude of extrusion does not have any effect. An extrusion of (0, 0, 0) acts like (0, 0, 1)
scale_x *= sign(text.dxf.extrusion.z)
if scale_x != 1 or scale_y != 1:
extra_transform = Matrix44.scale(scale_x, scale_y)
elif isinstance(text, MText):
# not sure about the rationale behind this but it does match AutoCAD behavior...
scale_y = sign(text.dxf.extrusion.z)
if scale_y != 1:
extra_transform = Matrix44.scale(1, scale_y)
return extra_transform
def transform_thickness_and_extrusion_without_ocs(entity: 'DXFGraphic', m: Matrix44) -> None:
if entity.dxf.hasattr('thickness'):
thickness = entity.dxf.thickness
reflection = sign(thickness)
thickness = m.transform_direction(entity.dxf.extrusion * thickness)
entity.dxf.thickness = thickness.magnitude * reflection
entity.dxf.extrusion = thickness.normalize()
elif entity.dxf.hasattr('extrusion'): # without thickness?
extrusion = m.transform_direction(entity.dxf.extrusion)
entity.dxf.extrusion = extrusion.normalize()
def _get_extra_transform(text: AnyText, line_width: float) -> Matrix44:
extra_transform = Matrix44()
if isinstance(text, Text): # Attrib and AttDef are sub-classes of Text
# 'width' is the width *scale factor* so 1.0 by default:
scale_x = text.dxf.width
scale_y = 1.0
# Calculate text stretching for FIT and ALIGNED:
alignment = text.get_align_enum()
line_width = abs(line_width)
if (
alignment in (TextEntityAlignment.FIT, TextEntityAlignment.ALIGNED)
and line_width > 1e-9
):
defined_length = (text.dxf.align_point - text.dxf.insert).magnitude
stretch_factor = defined_length / line_width
scale_x = stretch_factor
if alignment == TextEntityAlignment.ALIGNED:
scale_y = stretch_factor
if text.dxf.text_generation_flag & DXFConstants.MIRROR_X:
scale_x *= -1.0
if text.dxf.text_generation_flag & DXFConstants.MIRROR_Y:
scale_y *= -1.0
# Magnitude of extrusion does not have any effect.
# An extrusion of (0, 0, 0) acts like (0, 0, 1)
scale_x *= sign(text.dxf.extrusion.z)
if scale_x != 1.0 or scale_y != 1.0:
extra_transform = Matrix44.scale(scale_x, scale_y)
elif isinstance(text, MText):
# Not sure about the rationale behind this but it does match AutoCAD
# behavior...
scale_y = sign(text.dxf.extrusion.z)
if scale_y != 1.0:
extra_transform = Matrix44.scale(1.0, scale_y)
return extra_transform
def transform_length(self, length: 'Vertex', reflection=1.0) -> float:
""" Returns magnitude of `length` direction vector transformed from
old OCS into new OCS including `reflection` correction applied.
"""
return self.m.transform_direction(
self.old_ocs.to_wcs(length)).magnitude * sign(reflection)
