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system: improve auto relax multiple PlaneCoincidence

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This commit is contained in:
Zheng, Lei 2020-11-12 20:58:36 +08:00
parent c3380e602d
commit 6bb16b5550
1 changed files with 19 additions and 16 deletions
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35
freecad/asm3/system.py
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@ -125,6 +125,7 @@ class SystemExtension(object):
self.firstInfo = None
self.secondInfo = None
self.relax = False
self.coincidences = {}
def checkRedundancy(self,obj,firstInfo,secondInfo):
self.cstrObj,self.firstInfo,self.secondInfo=obj,firstInfo,secondInfo
@ -189,6 +190,10 @@ class SystemExtension(object):
if count < 0:
return
if count == 1:
self.coincidences[(self.firstInfo.Part, self.secondInfo.Part)] = pln1
self.coincidences[(self.secondInfo.Part, self.firstInfo.Part)] = pln2
if d or dx or dy:
dx,dy,d = pln2.normal.rot.multVec(FreeCAD.Vector(dx,dy,d))
v = pln2.origin.vector+FreeCAD.Vector(dx,dy,d)
@ -200,23 +205,21 @@ class SystemExtension(object):
if not lockAngle and count==2:
# if there is already some other plane coincident constraint set for
# this pair of parts, we reduce this second constraint to either a
# points horizontal or vertical constraint, i.e. reduce the
# constraining DOF down to 1.
# this pair of parts, we reduce this second constraint to a 2D
# PointOnLine. The line is formed by the first part's two elements
# in the previous and the current constraint. The point is taken
# from the element of the second part of the current constraint.
# The projection plane is taken from the element of the first part
# of the current constraint.
#
# We project the initial points to the first element plane, and
# check for differences in x and y components of the points to
# determine whether to use horizontal or vertical constraint.
rot = pln1.normal.pla.Rotation.multiply(pln1.normal.rot)
v1 = pln1.normal.pla.multVec(pln1.origin.vector)
v2 = pln2.normal.pla.multVec(v)
v1,v2 = project2D(rot, v1, v2)
if abs(v1.x-v2.x) < abs(v1.y-v2.y):
h.append(self.addPointsHorizontal(
pln1.origin.entity, e, pln1.entity, group=group))
else:
h.append(self.addPointsVertical(
pln1.origin.entity, e, pln1.entity, group=group))
# This 2D PointOnLine effectively reduce the second PlaneCoincidence
# constraining DOF down to 1.
prev = self.coincidences.get(
(self.firstInfo.Part, self.secondInfo.Part))
ln = self.addLineSegment(prev.origin.entity,
pln1.origin.entity, group=self.firstInfo.Group)
h.append(self.addPointOnLine(
pln2.origin.entity, ln, pln1.entity, group=group))
return h
h.append(self.addPointsCoincident(pln1.origin.entity, e, group=group))