def test_from_spline():
from ezdxf.entities import Spline
spline = Spline.new()
spline.fit_points = [(2, 0), (4, 1), (6, -1), (8, 0)]
path = Path.from_spline(spline)
assert path.start == (2, 0)
assert path.end == (8, 0)
def _virtual_edge_path(path: EdgePath, dxfattribs: Dict, ocs: OCS,
elevation: float) -> List["DXFGraphic"]:
from ezdxf.entities import Line, Arc, Ellipse, Spline
def pnt_to_wcs(v):
return ocs.to_wcs(Vec3(v).replace(z=elevation))
def dir_to_wcs(v):
return ocs.to_wcs(v)
edges: List["DXFGraphic"] = []
for edge in path.edges:
attribs = dict(dxfattribs)
if isinstance(edge, LineEdge):
attribs["start"] = pnt_to_wcs(edge.start)
attribs["end"] = pnt_to_wcs(edge.end)
edges.append(Line.new(dxfattribs=attribs))
elif isinstance(edge, ArcEdge):
attribs["center"] = edge.center
attribs["radius"] = edge.radius
attribs["elevation"] = elevation
# Arcs angles are always stored in counter clockwise orientation
# around the extrusion vector!
attribs["start_angle"] = edge.start_angle
attribs["end_angle"] = edge.end_angle
attribs["extrusion"] = ocs.uz
edges.append(Arc.new(dxfattribs=attribs))
elif isinstance(edge, EllipseEdge):
attribs["center"] = pnt_to_wcs(edge.center)
attribs["major_axis"] = dir_to_wcs(edge.major_axis)
attribs["ratio"] = edge.ratio
# Ellipse angles are always stored in counter clockwise orientation
# around the extrusion vector!
attribs["start_param"] = edge.start_param
attribs["end_param"] = edge.end_param
attribs["extrusion"] = ocs.uz
edges.append(Ellipse.new(dxfattribs=attribs))
elif isinstance(edge, SplineEdge):
spline = Spline.new(dxfattribs=attribs)
spline.dxf.degree = edge.degree
spline.knots = edge.knot_values
spline.control_points = [
pnt_to_wcs(v) for v in edge.control_points
]
if edge.weights:
spline.weights = edge.weights
if edge.fit_points:
spline.fit_points = [pnt_to_wcs(v) for v in edge.fit_points]
if edge.start_tangent is not None:
spline.dxf.start_tangent = dir_to_wcs(edge.start_tangent)
if edge.end_tangent is not None:
spline.dxf.end_tangent = dir_to_wcs(edge.end_tangent)
edges.append(spline)
return edges
def test_issue_494_make_path_from_spline_defined_by_fit_points_and_tangents():
from ezdxf.entities import Spline
spline = Spline.new(dxfattribs={
"degree":
3,
"start_tangent": (0.9920663924871818, 0.1257150464243202, 0.0),
"end_tangent": (0.9999448476387669, -0.0105024606965807, 0.0),
}, )
spline.fit_points = [
(209.5080107190219, 206.963463282597, 0.0),
(209.55254921431026, 206.96662062623636, 0.0),
]
p = make_path(spline)
assert len(p) > 0
def to_splines_and_polylines(
paths: Iterable[Path],
*,
g1_tol: float = G1_TOL,
dxfattribs: Optional[Dict] = None
) -> Iterable[Union[Spline, Polyline]]:
""" Convert the given `paths` into :class:`~ezdxf.entities.Spline` and 3D
:class:`~ezdxf.entities.Polyline` entities.
Args:
paths: iterable of :class:`Path` objects
g1_tol: tolerance for G1 continuity check
dxfattribs: additional DXF attribs
Returns:
iterable of :class:`~ezdxf.entities.Line` objects
.. versionadded:: 0.16
"""
if isinstance(paths, Path):
paths = [paths]
dxfattribs = dxfattribs or {}
for path in paths:
for data in to_bsplines_and_vertices(path, g1_tol):
if isinstance(data, BSpline):
spline = Spline.new(dxfattribs=dxfattribs)
spline.apply_construction_tool(data)
yield spline
else:
attribs = dict(dxfattribs)
attribs['flags'] = const.POLYLINE_3D_POLYLINE
polyline = Polyline.new(dxfattribs=dxfattribs)
polyline.append_vertices(data)
yield polyline