def to_ellipse(self, replace=True) -> 'Ellipse':
""" Convert CIRCLE/ARC to an :class:`~ezdxf.entities.Ellipse` entity.
Adds the new ELLIPSE entity to the entity database and to the
same layout as the source entity.
Args:
replace: replace (delete) source entity by ELLIPSE entity if ``True``
.. versionadded:: 0.13
"""
from ezdxf.entities import Ellipse
ellipse = Ellipse.from_arc(self)
if replace:
replace_entity(self, ellipse)
else:
add_entity(self, ellipse)
return ellipse
def to_ellipse(self, replace=True) -> "Ellipse":
"""Convert CIRCLE/ARC to an :class:`~ezdxf.entities.Ellipse` entity.
Adds the new ELLIPSE entity to the entity database and to the
same layout as the source entity.
Args:
replace: replace (delete) source entity by ELLIPSE entity if ``True``
"""
from ezdxf.entities import Ellipse
layout = self.get_layout()
if layout is None:
raise DXFValueError("valid layout required")
ellipse = Ellipse.from_arc(self)
if replace:
replace_entity(self, ellipse, layout)
else:
add_entity(ellipse, layout)
return ellipse
def virtual_block_reference_entities(
block_ref: 'Insert') -> Iterable['DXFGraphic']:
"""
Yields 'virtual' parts of block reference `block_ref`. This method is meant to examine the the block reference
entities without the need to explode the block reference.
This entities are located at the 'exploded' positions, but are not stored in the entity database, have no handle
and are not assigned to any layout.
Args:
block_ref: Block reference entity (INSERT)
.. warning::
**Non uniform scaling** returns incorrect results for text entities (TEXT, MTEXT, ATTRIB) and
some other entities like ELLIPSE, SHAPE, HATCH with arc or ellipse path segments and
POLYLINE/LWPOLYLINE with arc segments.
(internal API)
"""
assert block_ref.dxftype() == 'INSERT'
brcs = block_ref.brcs()
# Non uniform scaling will produce incorrect results for some entities!
xscale = block_ref.dxf.xscale
yscale = block_ref.dxf.yscale
uniform_scaling = max(abs(xscale), abs(yscale))
non_uniform_scaling = xscale != yscale
block_layout = block_ref.block()
if block_layout is None:
raise DXFStructureError(
f'Required block definition for "{block_ref.dxf.name}" does not exist.'
)
for entity in block_layout:
dxftype = entity.dxftype()
if dxftype == 'ATTDEF': # do not explode ATTDEF entities
continue
# Copy entity with all DXF attributes
try:
copy = entity.copy()
except DXFTypeError:
continue # non copyable entities will be ignored
if non_uniform_scaling and dxftype in {'ARC', 'CIRCLE'}:
from ezdxf.entities import Ellipse
copy = Ellipse.from_arc(entity)
dxftype = copy.dxftype()
# Basic transformation from BRCS to WCS
try:
copy.transform_to_wcs(brcs)
except NotImplementedError: # entities without 'transform_to_ucs' support will be ignored
continue
# Apply DXF attribute scaling:
# 1. simple entities without properties to scale
if dxftype in {
'LINE', 'POINT', 'LWPOLYLINE', 'POLYLINE', 'MESH', 'HATCH',
'SPLINE', 'SOLID', '3DFACE', 'TRACE', 'IMAGE', 'WIPEOUT',
'XLINE', 'RAY', 'LIGHT', 'HELIX'
}:
pass # nothing else to do
elif dxftype in {'CIRCLE', 'ARC'}:
# simple uniform scaling of radius
# Non uniform scaling: ARC, CIRCLE -> ELLIPSE
copy.dxf.radius = entity.dxf.radius * uniform_scaling
elif dxftype == 'ELLIPSE':
if non_uniform_scaling:
if entity.dxftype(
) == 'ELLIPSE': # original entity is an ELLIPSE
ellipse = cast('Ellipse', entity)
# transform axis
conjugated_major_axis = brcs.direction_to_wcs(
ellipse.dxf.major_axis)
conjugated_minor_axis = brcs.direction_to_wcs(
ellipse.minor_axis)
major_axis, _, ratio = rytz_axis_construction(
conjugated_major_axis, conjugated_minor_axis)
copy.dxf.major_axis = major_axis
copy.dxf.ratio = max(ratio, 1e-6)
# adjusting start- and end parameter
center = copy.dxf.center # transformed center point
start_point, end_point = ellipse.vertices(
(ellipse.dxf.start_param, ellipse.dxd.end_param))
start_vec = brcs.to_wcs(start_point) - center
end_vec = brcs.to_wcs(end_point) - center
# The dot product (scalar product) is the angle between two vectors.
# https://en.wikipedia.org/wiki/Dot_product
# Not sure if this is the correct way to adjust start- and end parameter
copy.dxf.start_param = normalize_angle(
major_axis.dot(start_vec))
copy.dxf.end_param = normalize_angle(
major_axis.dot(end_vec))
if copy.dxf.ratio > 1:
copy.swap_axis()
else: # converted from ARC to ELLIPSE
ellipse = cast('Ellipse', copy)
ellipse.dxf.ratio = max(yscale / xscale, 1e-6)
if ellipse.dxf.ratio > 1:
ellipse.swap_axis()
elif dxftype == 'MTEXT':
# Scale MTEXT height/width just by uniform_scaling, how to handle non uniform scaling?
copy.dxf.char_height *= uniform_scaling
copy.dxf.width *= uniform_scaling
elif dxftype in {'TEXT', 'ATTRIB'}:
# Scale TEXT height just by uniform_scaling, how to handle non uniform scaling?
copy.dxf.height *= uniform_scaling
elif dxftype == 'INSERT':
# Set scaling of child INSERT to scaling of parent INSERT
for scale in ('xscale', 'yscale', 'zscale'):
if block_ref.dxf.hasattr(scale):
original_scale = copy.dxf.get_default(scale)
block_ref_scale = block_ref.dxf.get(scale)
copy.dxf.set(scale, original_scale * block_ref_scale)
if uniform_scaling != 1:
# Scale attached ATTRIB entities:
# Scale height just by uniform_scaling, how to handle non uniform scaling?
for attrib in copy.attribs:
attrib.dxf.height *= uniform_scaling
elif dxftype == 'SHAPE':
# Scale SHAPE size just by uniform_scaling, how to handle non uniform scaling?
copy.dxf.size *= uniform_scaling
else: # unsupported entity will be ignored
continue
yield copy