def _virtual_polyline_entities(points, elevation: float, extrusion: Vector,
dxfattribs: dict,
doc) -> Iterable[Union['Line', 'Arc']]:
ocs = OCS(extrusion) if extrusion else OCS()
prev_point = None
prev_bulge = None
for x, y, bulge in points:
point = Vector(x, y, elevation)
if prev_point is None:
prev_point = point
prev_bulge = bulge
continue
attribs = dict(dxfattribs)
if prev_bulge != 0:
center, start_angle, end_angle, radius = bulge_to_arc(
prev_point, point, prev_bulge)
attribs['center'] = Vector(center.x, center.y, elevation)
attribs['radius'] = radius
attribs['start_angle'] = math.degrees(start_angle)
attribs['end_angle'] = math.degrees(end_angle)
if extrusion:
attribs['extrusion'] = extrusion
yield Arc.new(doc=doc, dxfattribs=attribs)
else:
attribs['start'] = ocs.to_wcs(prev_point)
attribs['end'] = ocs.to_wcs(point)
yield Line.new(doc=doc, dxfattribs=attribs)
prev_point = point
prev_bulge = bulge
def arc():
return Arc.new(
dxfattribs={
"center": (3, 4, 5),
"radius": 2.0,
"start_angle": 15,
"end_angle": 75,
"extrusion": (0, 0, -1),
})
def test_symmetric_difference(self, base: EntityQuery):
other = base.query("LINE") | EntityQuery(
[Arc.new(dxfattribs={
"layer": "arc",
"color": 4
})])
result = base ^ other
assert len(result) == 3
assert set(e.dxftype() for e in result) == {"CIRCLE", "TEXT", "ARC"}
def arc(radius=1, start=30, end=150, count=8):
arc_ = Arc.new(dxfattribs={
'center': (0, 0, 0),
'radius': radius,
'start_angle': start,
'end_angle': end
},
doc=doc)
control_vertices = list(arc_.vertices(arc_.angles(count)))
return arc_, control_vertices
def test_from_arc():
from ezdxf.entities import Arc
arc = Arc.new(dxfattribs={
'center': (1, 0, 0),
'radius': 1,
'start_angle': 0,
'end_angle': 180,
})
path = Path.from_arc(arc)
assert path.start == (2, 0)
assert path.end == (0, 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 build():
arc = Arc.new(dxfattribs={
'start_angle': random.uniform(0, 360),
'end_angle': random.uniform(0, 360),
})
vertices = list(arc.vertices(arc.angles(vertex_count)))
m = Matrix44.chain(
Matrix44.axis_rotate(axis=Vec3.random(), angle=random.uniform(0, math.tau)),
Matrix44.translate(dx=random.uniform(-2, 2), dy=random.uniform(-2, 2), dz=random.uniform(-2, 2)),
)
return synced_transformation(arc, vertices, m)
def arc(radius=1, start=30, end=150, count=8):
arc_ = Arc.new(
dxfattribs={
"center": (0, 0, 0),
"radius": radius,
"start_angle": start,
"end_angle": end,
},
doc=doc,
)
control_vertices = list(arc_.vertices(arc_.angles(count)))
return arc_, control_vertices
def test_from_arc():
from ezdxf.entities import Arc
spline = Spline.from_arc(Arc.new(dxfattribs={
'center': (1, 1),
'radius': 2,
'start_angle': 30, # degrees
'end_angle': 150,
'layer': 'arc',
}))
assert spline.dxf.layer == 'arc'
assert spline.dxf.degree == 2
assert len(spline.control_points) > 2
assert len(spline.weights) > 2
assert len(spline.fit_points) == 0
assert len(spline.knots) == required_knot_values(len(spline.control_points), spline.dxf.degree + 1)
def test_from_arc():
from ezdxf.entities import Arc
spline = Spline.from_arc(
Arc.new(
dxfattribs={
"center": (1, 1),
"radius": 2,
"start_angle": 30, # degrees
"end_angle": 150,
"layer": "arc",
}))
assert spline.dxf.layer == "arc"
assert spline.dxf.degree == 2
assert len(spline.control_points) > 2
assert len(spline.weights) > 2
assert len(spline.fit_points) == 0
assert len(spline.knots) == required_knot_values(
len(spline.control_points), spline.dxf.degree + 1)
def test_remove_supports_virtual_entities():
result = EntityQuery([Text(), Line(), Arc()]).remove("TEXT")
assert len(result) == 2
