Fix handling of infinite line

Fixes #222

constraint.py

@@ -180,8 +180,8 @@ def _l(solver,partInfo,subname,shape,retAll=False):
         system.log('cache {}: {}',key,h)
     else:
         nameTag = partInfo.PartName + '.' + key
+        v = utils.getVertexes(shape)
         if utils.isDraftWire(part):
-            v = shape.Edge1.Vertexes
             vname1,vname2 = utils.edge2VertexIndex(part,subname)
             if not vname1:
                 raise RuntimeError('Invalid draft subname {} or {}'.format(
@@ -189,9 +189,12 @@ def _l(solver,partInfo,subname,shape,retAll=False):
             tp0 = _p(solver,partInfo,vname1,v[0])
             tp1 = _p(solver,partInfo,vname2,v[1])
         else:
-            v = shape.Edge1.Vertexes
             system.NameTag = nameTag + 'p0'
+            try:
                 p0 = system.addPoint3dV(*v[0].Point)
+            except Exception:
+                logger.info(system.NameTag)
+                raise
             system.NameTag = nameTag + 'p0t'
             tp0 = system.addTransform(p0,*partInfo.Params,group=partInfo.Group)
             system.NameTag = nameTag + 'p1'
@@ -873,7 +876,7 @@ class Locked(Base):
 
         nameTag = partInfo.PartName + '.' + info.Subname
 
-        for i,v in enumerate(info.Shape.Vertexes):
+        for i,v in enumerate(utils.getVertexes(info.Shape)):
             surfix = '.fp{}'.format(i)
             system.NameTag = nameTag + surfix
 

utils.py

@@ -62,10 +62,7 @@ def objName(obj):
         return '?'
 
 def isLine(param):
-    if hasattr(Part,"LineSegment"):
     return isinstance(param,(Part.Line,Part.LineSegment))
-    else:
-        return isinstance(param,Part.Line)
 
 def deduceSelectedElement(obj,subname):
     shape = obj.getSubObject(subname)
@@ -278,6 +275,16 @@ def isSphericalSurface(obj):
         return False
     return str( face.Surface ).startswith('Sphere ')
 
+def getVertexes(shape):
+    v = shape.Vertexes
+    if v or shape.countElement('Edge')!=1:
+        return v
+    curve = shape.Edge1.Curve
+    if isinstance(curve,Part.Line):
+        return [Part.Vertex(curve.Location),
+                Part.Vertex(curve.Location+curve.Direction)]
+    return []
+
 def getElementPos(obj):
     vertex = getElementShape(obj,Part.Vertex)
     if vertex:
@@ -308,7 +315,9 @@ def getElementPos(obj):
         edge = getElementShape(obj,Part.Edge)
         if not edge:
             return FreeCAD.Vector()
-        if isLine(edge.Curve):
+        if isinstance(edge.Curve,Part.Line):
+            return edge.Curve.Location
+        elif isinstance(edge.Curve,Part.LineSegment):
             #  pos = edge.Vertexes[-1].Point
             return (edge.Vertex1.Point+edge.Vertex2.Point)*0.5
         elif hasattr( edge.Curve, 'Center'): #circular curve