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985c397 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 | # SPDX-License-Identifier: LGPL-2.1-or-later
# ***************************************************************************
# * Copyright (c) 2009, 2010 Yorik van Havre <yorik@uncreated.net> *
# * Copyright (c) 2009, 2010 Ken Cline <cline@frii.com> *
# * *
# * This file is part of the FreeCAD CAx development system. *
# * *
# * This program is free software; you can redistribute it and/or modify *
# * it under the terms of the GNU Lesser General Public License (LGPL) *
# * as published by the Free Software Foundation; either version 2 of *
# * the License, or (at your option) any later version. *
# * for detail see the LICENCE text file. *
# * *
# * FreeCAD is distributed in the hope that it will be useful, *
# * but WITHOUT ANY WARRANTY; without even the implied warranty of *
# * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
# * GNU Library General Public License for more details. *
# * *
# * You should have received a copy of the GNU Library General Public *
# * License along with FreeCAD; if not, write to the Free Software *
# * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 *
# * USA *
# * *
# ***************************************************************************
"""Provides various functions to work with edges."""
## @package edges
# \ingroup draftgeoutils
# \brief Provides various functions to work with edges.
import lazy_loader.lazy_loader as lz
import FreeCAD as App
import DraftVecUtils
from draftgeoutils.general import geomType, vec
# Delay import of module until first use because it is heavy
Part = lz.LazyLoader("Part", globals(), "Part")
## \addtogroup draftgeoutils
# @{
def findEdge(anEdge, aList):
"""Return True if edge is found in list of edges."""
for e in range(len(aList)):
if str(anEdge.Curve) == str(aList[e].Curve):
if DraftVecUtils.equals(anEdge.Vertexes[0].Point, aList[e].Vertexes[0].Point):
if DraftVecUtils.equals(anEdge.Vertexes[-1].Point, aList[e].Vertexes[-1].Point):
return e
return None
def orientEdge(edge, normal=None, make_arc=False):
"""Re-orient the edge such that it is in the XY plane.
Re-orients `edge` such that it is in the XY plane.
If `normal` is passed, this is used as the basis for the rotation,
otherwise the placement of `edge` is used.
"""
# This 'normalizes' the placement to the xy plane
edge = edge.copy()
xyDir = App.Vector(0, 0, 1)
base = App.Vector(0, 0, 0)
if normal:
angle = DraftVecUtils.angle(normal, xyDir) * App.Units.Radian
axis = normal.cross(xyDir)
else:
axis = edge.Placement.Rotation.Axis
angle = -1 * edge.Placement.Rotation.Angle * App.Units.Radian
if axis == App.Vector(0.0, 0.0, 0.0):
axis = App.Vector(0.0, 0.0, 1.0)
if angle:
edge.rotate(base, axis, angle)
if isinstance(edge.Curve, Part.Line):
return Part.LineSegment(edge.Curve, edge.FirstParameter, edge.LastParameter)
elif make_arc and isinstance(edge.Curve, Part.Circle) and not edge.Closed:
return Part.ArcOfCircle(
edge.Curve, edge.FirstParameter, edge.LastParameter, edge.Curve.Axis.z > 0
)
elif make_arc and isinstance(edge.Curve, Part.Ellipse) and not edge.Closed:
return Part.ArcOfEllipse(
edge.Curve, edge.FirstParameter, edge.LastParameter, edge.Curve.Axis.z > 0
)
return edge.Curve
def isSameLine(e1, e2):
"""Return True if the 2 edges are lines and have the same points."""
if not isinstance(e1.Curve, Part.LineSegment):
return False
if not isinstance(e2.Curve, Part.LineSegment):
return False
if DraftVecUtils.equals(e1.Vertexes[0].Point, e2.Vertexes[0].Point) and DraftVecUtils.equals(
e1.Vertexes[-1].Point, e2.Vertexes[-1].Point
):
return True
elif DraftVecUtils.equals(e1.Vertexes[-1].Point, e2.Vertexes[0].Point) and DraftVecUtils.equals(
e1.Vertexes[0].Point, e2.Vertexes[-1].Point
):
return True
return False
def is_line(bspline):
"""Return True if the given BSpline curve is a straight line."""
# previous implementation may fail for a multipole straight spline due
# a second order error in tolerance, which introduce a difference of 1e-14
# in the values of the tangents. Also, may fail on a periodic spline.
# step = bspline.LastParameter/10
# b = bspline.tangent(0)
#
# for i in range(10):
# if bspline.tangent(i * step) != b:
# return False
start_point = bspline.StartPoint
end_point = bspline.EndPoint
dist_start_end = end_point.distanceToPoint(start_point)
if abs(bspline.length() - dist_start_end) < 1e-7:
return True
return False
def invert(shape):
"""Return an inverted copy of the edge or wire contained in the shape."""
if shape.ShapeType == "Wire":
edges = [invert(edge) for edge in shape.OrderedEdges]
edges.reverse()
return Part.Wire(edges)
elif shape.ShapeType == "Edge":
if len(shape.Vertexes) == 1:
return shape
if geomType(shape) == "Line":
return Part.LineSegment(shape.Vertexes[-1].Point, shape.Vertexes[0].Point).toShape()
elif geomType(shape) == "Circle":
mp = findMidpoint(shape)
return Part.Arc(shape.Vertexes[-1].Point, mp, shape.Vertexes[0].Point).toShape()
elif geomType(shape) in ["BSplineCurve", "BezierCurve"]:
if isLine(shape.Curve):
return Part.LineSegment(shape.Vertexes[-1].Point, shape.Vertexes[0].Point).toShape()
print("DraftGeomUtils.invert: unable to invert", shape.Curve)
return shape
else:
print("DraftGeomUtils.invert: unable to handle", shape.ShapeType)
return shape
def findMidpoint(edge):
"""Return the midpoint of an edge."""
if edge.Length == 0:
return None
else:
return edge.valueAt(edge.Curve.parameterAtDistance(edge.Length / 2, edge.FirstParameter))
def getTangent(edge, from_point=None):
"""Return the tangent to an edge, including BSpline and circular arcs.
If from_point is given, it is used to calculate the tangent,
only useful for a circular arc.
"""
if geomType(edge) == "Line":
return vec(edge)
elif geomType(edge) == "BSplineCurve" or geomType(edge) == "BezierCurve":
if not from_point:
return None
cp = edge.Curve.parameter(from_point)
return edge.Curve.tangent(cp)[0]
elif geomType(edge) == "Circle":
if not from_point:
v1 = edge.Vertexes[0].Point.sub(edge.Curve.Center)
else:
v1 = from_point.sub(edge.Curve.Center)
return v1.cross(edge.Curve.Axis)
return None
def get_referenced_edges(property_value):
"""Return the Edges referenced by the value of a App:PropertyLink, App::PropertyLinkList,
App::PropertyLinkSub or App::PropertyLinkSubList property."""
edges = []
if not isinstance(property_value, list):
property_value = [property_value]
for element in property_value:
if hasattr(element, "Shape") and element.Shape:
edges += element.Shape.Edges
elif isinstance(element, tuple) and len(element) == 2:
object, subelement_names = element
if hasattr(object, "Shape") and object.Shape:
if len(subelement_names) == 1 and subelement_names[0] == "":
edges += object.Shape.Edges
else:
for subelement_name in subelement_names:
if subelement_name.startswith("Edge"):
edge_number = int(subelement_name.lstrip("Edge")) - 1
if edge_number < len(object.Shape.Edges):
edges.append(object.Shape.Edges[edge_number])
return edges
# compatibility layer
isLine = is_line
## @}
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