Merge branch 'master' of https://github.com/dcowden/cadquery

CadQuery/Libs/cadquery-lib/.travis.yml

@@ -1,6 +1,6 @@
 language: python
 before_install:
-- sudo add-apt-repository -y ppa:freecad-maintainers/freecad-daily
+- sudo add-apt-repository -y ppa:freecad-maintainers/freecad-stable
 - sudo apt-get update -qq
 install:
 - sudo apt-get install -y freecad freecad-doc
@@ -11,6 +11,7 @@ install:
 - pip install coveralls
 - pip install Sphinx==1.3.2
 - pip install travis-sphinx
+- pip install pyparsing
 script:
 - coverage run --source=cadquery ./runtests.py
 - travis-sphinx --nowarn --source=doc build

CadQuery/Libs/cadquery-lib/cadquery/cq.py

@@ -1967,7 +1967,7 @@ class Workplane(CQ):
         if clean: newS = newS.clean()
         return newS
 
-    def extrude(self, distance, combine=True, clean=True):
+    def extrude(self, distance, combine=True, clean=True, both=False):
         """
         Use all un-extruded wires in the parent chain to create a prismatic solid.
 
@@ -1975,6 +1975,7 @@ class Workplane(CQ):
         :type distance: float, negative means opposite the normal direction
         :param boolean combine: True to combine the resulting solid with parent solids if found.
         :param boolean clean: call :py:meth:`clean` afterwards to have a clean shape
+        :param boolean both: extrude in both directions symmetrically
         :return: a CQ object with the resulting solid selected.
 
         extrude always *adds* material to a part.
@@ -1990,8 +1991,9 @@ class Workplane(CQ):
             Support for non-prismatic extrusion ( IE, sweeping along a profile, not just
             perpendicular to the plane extrude to surface. this is quite tricky since the surface
             selected may not be planar
-        """
-        r = self._extrude(distance)  # returns a Solid (or a compound if there were multiple)
+        """               
+        r = self._extrude(distance,both=both)  # returns a Solid (or a compound if there were multiple)
+            
         if combine:
             newS = self._combineWithBase(r)
         else:
@@ -2254,11 +2256,12 @@ class Workplane(CQ):
 
         return self.newObject([r])
 
-    def _extrude(self, distance):
+    def _extrude(self, distance, both=False):
         """
         Make a prismatic solid from the existing set of pending wires.
 
         :param distance: distance to extrude
+        :param boolean both: extrude in both directions symmetrically
         :return: a FreeCAD solid, suitable for boolean operations.
 
         This method is a utility method, primarily for plugin and internal use.
@@ -2305,6 +2308,10 @@ class Workplane(CQ):
         for ws in wireSets:
             thisObj = Solid.extrudeLinear(ws[0], ws[1:], eDir)
             toFuse.append(thisObj)
+            
+            if both:
+                thisObj = Solid.extrudeLinear(ws[0], ws[1:], eDir.multiply(-1.))
+                toFuse.append(thisObj)
 
         return Compound.makeCompound(toFuse)
 

CadQuery/Libs/cadquery-lib/cadquery/selectors.py

@@ -20,6 +20,8 @@
 import re
 import math
 from cadquery import Vector,Edge,Vertex,Face,Solid,Shell,Compound
+from pyparsing import Literal,Word,nums,Optional,Combine,oneOf,\
+                      upcaseTokens,CaselessLiteral,Group
 
 
 class Selector(object):
@@ -306,15 +308,66 @@ class DirectionMinMaxSelector(Selector):
             #    pnt = tShape.Center()
             #return pnt.dot(self.vector)
 
+        # import OrderedDict
+        from collections import OrderedDict
+        #make and distance to object dict
+        objectDict = {distance(el) : el for el in objectList}
+        #transform it into an ordered dict
+        objectDict = OrderedDict(sorted(objectDict.items(),
+                                        key=lambda x: x[0]))
+
         # find out the max/min distance
         if self.directionMax:
-            d = max(map(distance, objectList))
+            d = objectDict.keys()[-1]
         else:
-            d = min(map(distance, objectList))
-
+            d = objectDict.keys()[0]
+            
         # return all objects at the max/min distance (within a tolerance)
         return filter(lambda o: abs(d - distance(o)) < self.TOLERANCE, objectList)
 
+class DirectionNthSelector(ParallelDirSelector):
+    """
+        Selects nth object parallel (or normal) to the specified direction
+        Used for faces and edges
+
+        Applicability:
+            Linear Edges
+            Planar Faces
+    """
+    def __init__(self, vector, n, directionMax=True, tolerance=0.0001):
+        self.direction = vector
+        self.max = max
+        self.directionMax = directionMax
+        self.TOLERANCE = tolerance
+        if directionMax:
+            self.N = n #do we want indexing from 0 or from 1?
+        else:
+            self.N = -n
+            
+    def filter(self,objectList):
+        #select first the objects that are normal/parallel to a given dir
+        objectList = super(DirectionNthSelector,self).filter(objectList)
+
+        def distance(tShape):
+            return tShape.Center().dot(self.direction)
+            #if tShape.ShapeType == 'Vertex':
+            #    pnt = tShape.Point
+            #else:
+            #    pnt = tShape.Center()
+            #return pnt.dot(self.vector)
+
+        #make and distance to object dict
+        objectDict = {distance(el) : el for el in objectList}
+        #calculate how many digits of precision do we need
+        digits = int(1/self.TOLERANCE)
+        # create a rounded distance to original distance mapping (implicitly perfroms unique operation)
+        dist_round_dist = {round(d,digits) : d for d in objectDict.keys()}
+        # choose the Nth unique rounded distance
+        nth_d = dist_round_dist[sorted(dist_round_dist.keys())[self.N]]
+            
+        # map back to original objects and return
+        return [objectDict[d] for d in objectDict.keys() if abs(d-nth_d) < self.TOLERANCE] 
+
 class BinarySelector(Selector):
     """
     Base class for selectors that operates with two other
@@ -367,6 +420,62 @@ class InverseSelector(Selector):
         # note that Selector() selects everything
         return SubtractSelector(Selector(), self.selector).filter(objectList)
 
+
+def _makeGrammar():
+    """
+    Define the string selector grammar using PyParsing
+    """
+    
+    #float definition
+    point = Literal('.')
+    plusmin = Literal('+') | Literal('-')
+    number = Word(nums)
+    integer = Combine(Optional(plusmin) + number)
+    floatn = Combine(integer + Optional(point + Optional(number)))
+    
+    #vector definition
+    lbracket = Literal('(')
+    rbracket = Literal(')')
+    comma = Literal(',')
+    vector = Combine(lbracket + floatn('x') + comma + \
+                     floatn('y') + comma + floatn('z') + rbracket)
+    
+    #direction definition
+    simple_dir = oneOf(['X','Y','Z','XY','XZ','YZ'])
+    direction = simple_dir('simple_dir') | vector('vector_dir')
+    
+    #CQ type definition
+    cqtype = oneOf(['Plane','Cylinder','Sphere','Cone','Line','Circle','Arc'],
+                   caseless=True)
+    cqtype = cqtype.setParseAction(upcaseTokens)
+    
+    #type operator        
+    type_op = Literal('%')
+    
+    #direction operator
+    direction_op = oneOf(['>','<'])
+    
+    #index definition
+    ix_number = Group(Optional('-')+Word(nums))
+    lsqbracket = Literal('[').suppress()
+    rsqbracket = Literal(']').suppress()
+    
+    index = lsqbracket + ix_number('index') + rsqbracket
+    
+    #other operators
+    other_op = oneOf(['|','#','+','-'])
+    
+    #named view
+    named_view = oneOf(['front','back','left','right','top','bottom'])
+    
+    return direction('only_dir') | \
+           (type_op('type_op') + cqtype('cq_type')) | \
+           (direction_op('dir_op') + direction('dir') + Optional(index)) | \
+           (other_op('other_op') + direction('dir')) | \
+           named_view('named_view')
+
+_grammar = _makeGrammar() #make a grammar instance
+
 class StringSyntaxSelector(Selector):
     """
         Filter lists objects using a simple string syntax. All of the filters available in the string syntax
@@ -414,58 +523,70 @@ class StringSyntaxSelector(Selector):
             'XZ': Vector(1,0,1)
         }
 
-        namedViews = {
-            'front': ('>','Z' ),
-            'back': ('<','Z'),
-            'left':('<', 'X'),
-            'right': ('>', 'X'),
-            'top': ('>','Y'),
-            'bottom': ('<','Y')
+        self.namedViews = {
+            'front' : (Vector(0,0,1),True),
+            'back'  : (Vector(0,0,1),False),
+            'left'  : (Vector(1,0,0),False),
+            'right' : (Vector(1,0,0),True),
+            'top'   : (Vector(0,1,0),True),
+            'bottom': (Vector(0,1,0),False)
         }
+        
+        self.operatorMinMax = {
+            '>' : True,
+            '<' : False,
+            '+' : True,
+            '-' : False
+        }
+        
+        self.operator = {
+            '+' : DirectionSelector,
+            '-' : DirectionSelector,
+            '#' : PerpendicularDirSelector,
+            '|' : ParallelDirSelector}
+        
         self.selectorString = selectorString
-        r = re.compile("\s*([-\+<>\|\%#])*\s*(\w+)\s*",re.IGNORECASE)
-        m = r.match(selectorString)
-
-        if m != None:
-            if namedViews.has_key(selectorString):
-                (a,b) = namedViews[selectorString]
-                self.mySelector = self._chooseSelector(a,b )
-            else:
-                self.mySelector = self._chooseSelector(m.groups()[0],m.groups()[1])
-        else:
-            raise ValueError ("Selector String format must be [-+<>|#%] X|Y|Z ")
-
-
-    def _chooseSelector(self,selType,selAxis):
-        """Sets up the underlying filters accordingly"""
-
-        if selType == "%":
-            return TypeSelector(selAxis)
-
-        #all other types need to select axis as a vector
-        #get the axis vector first, will throw an except if an unknown axis is used
-        try:
-            vec = self.axes[selAxis]
-        except KeyError:
-            raise ValueError ("Axis value %s not allowed: must be one of %s" % (selAxis, str(self.axes)))
-
-        if selType in (None, "+"):
-            #use direction filter
+        parsing_result = _grammar.parseString(selectorString)
+        self.mySelector = self._chooseSelector(parsing_result)
+        
+    def _chooseSelector(self,pr):
+        """
+        Sets up the underlying filters accordingly
+        """
+        if 'only_dir' in pr:
+            vec = self._getVector(pr)
             return DirectionSelector(vec)
-        elif selType == '-':
-            #just use the reverse of the direction vector
-            return DirectionSelector(vec.multiply(-1.0))
-        elif selType == "|":
-            return ParallelDirSelector(vec)
-        elif selType == ">":
-            return DirectionMinMaxSelector(vec,True)
-        elif selType == "<":
-            return DirectionMinMaxSelector(vec,False)
-        elif selType == '#':
-            return PerpendicularDirSelector(vec)
+        
+        elif 'type_op' in pr:
+            return TypeSelector(pr.cq_type) 
+        
+        elif 'dir_op' in pr:
+            vec = self._getVector(pr)
+            minmax = self.operatorMinMax[pr.dir_op]
+            
+            if 'index' in pr:
+                return DirectionNthSelector(vec,int(''.join(pr.index.asList())),minmax)
+            else:
+                return DirectionMinMaxSelector(vec,minmax)
+        
+        elif 'other_op' in pr:
+            vec = self._getVector(pr)
+            return self.operator[pr.other_op](vec)
+        
         else:
-            raise ValueError ("Selector String format must be [-+<>|] X|Y|Z ")
-
+            args = self.namedViews[pr.named_view]
+            return DirectionMinMaxSelector(*args)
+            
+    def _getVector(self,pr):
+        """
+        Translate parsed vector string into a CQ Vector
+        """
+        if 'vector_dir' in pr:
+            vec = pr.vector_dir
+            return Vector(float(vec.x),float(vec.y),float(vec.z))
+        else:
+            return self.axes[pr.simple_dir]
+            
     def filter(self,objectList):
         """
             selects minimum, maximum, positive or negative values relative to a direction

CadQuery/Libs/cadquery-lib/changes.md

@@ -84,3 +84,12 @@ v0.5.1
 ------
    * Mirroring fixes (thanks @huskier)
    * Added a mirroring example (thanks @huskier)
+
+v0.5.2
+------
+   * Added the sweep operation #33
+
+v1.0.0 (unreleased)
+------
+   * Added an option to do symmetric extrusion about the workplane (thanks @adam-urbanczyk)
+   * Extended selector syntax to include Nth selector and re-implemented selectors using pyparsing (thanks @adam-urbanczyk)

CadQuery/Libs/cadquery-lib/tests/TestCQSelectors.py

@@ -166,7 +166,51 @@ class TestCQSelectors(BaseTest):
         # test the case of multiple objects at the same distance
         el = c.edges("<Z").vals()
         self.assertEqual(4, len(el))
-
+        
+    def testNthDistance(self):
+        c = Workplane('XY').pushPoints([(-2,0),(2,0)]).box(1,1,1)
+        
+        #2nd face
+        val = c.faces(selectors.DirectionNthSelector(Vector(1,0,0),1)).val()
+        self.assertAlmostEqual(val.Center().x,-1.5)
+        
+        #2nd face with inversed selection vector
+        val = c.faces(selectors.DirectionNthSelector(Vector(-1,0,0),1)).val()
+        self.assertAlmostEqual(val.Center().x,1.5)
+        
+        #2nd last face
+        val = c.faces(selectors.DirectionNthSelector(Vector(1,0,0),-2)).val()
+        self.assertAlmostEqual(val.Center().x,1.5)
+        
+        #Last face
+        val = c.faces(selectors.DirectionNthSelector(Vector(1,0,0),-1)).val()
+        self.assertAlmostEqual(val.Center().x,2.5)
+        
+        #check if the selected face if normal to the specified Vector
+        self.assertAlmostEqual(val.normalAt().cross(Vector(1,0,0)).Length,0.0)
+        
+        #repeat the test using string based selector
+        
+        #2nd face
+        val = c.faces('>(1,0,0)[1]').val()
+        self.assertAlmostEqual(val.Center().x,-1.5)
+        
+        #2nd face with inversed selection vector
+        val = c.faces('>(-1,0,0)[1]').val()
+        self.assertAlmostEqual(val.Center().x,1.5)
+        
+        #2nd last face
+        val = c.faces('>X[-2]').val()
+        self.assertAlmostEqual(val.Center().x,1.5)
+        
+        #Last face
+        val = c.faces('>X[-1]').val()
+        self.assertAlmostEqual(val.Center().x,2.5)
+        
+        #check if the selected face if normal to the specified Vector
+        self.assertAlmostEqual(val.normalAt().cross(Vector(1,0,0)).Length,0.0)
+        
+        
     def testNearestTo(self):
         c = CQ(makeUnitCube())
 
@@ -356,3 +400,30 @@ class TestCQSelectors(BaseTest):
         #make sure the vertex is the right one
 
         self.assertTupleAlmostEquals((0.0,0.0,1.0),v2.val().toTuple() ,3)
+        
+    def testGrammar(self):
+        """
+        Test if reasonable string selector expressions parse without an error
+        """
+        
+        gram = selectors._makeGrammar()
+
+        expressions = ['+X ',
+                       '-Y',
+                       '|(1,0,0)',
+                       '#(1.,1.4114,-0.532)',
+                       '%Plane',
+                       '>XZ',
+                       '<Z[-2]',
+                       '>(1,4,55.)[20]',
+                       '|XY',
+                       '<YZ[0]',
+                       'front',
+                       'back',
+                       'left',
+                       'right',
+                       'top',
+                       'bottom']
+        
+        for e in expressions: gram.parseString(e)
+        

CadQuery/Libs/cadquery-lib/tests/TestCadQuery.py

@@ -1387,3 +1387,27 @@ class TestCadQuery(BaseTest):
         result =topOfLid.union(bottom)
 
         self.saveModel(result)
+        
+    def testExtrude(self):
+        """
+        Test symmetric extrude
+        """
+        r = 1.
+        h = 1.
+        decimal_places = 9.
+        
+        #extrude symmetrically
+        s = Workplane("XY").circle(r).extrude(h,both=True)
+        
+        top_face = s.faces(">Z")
+        bottom_face = s.faces("<Z")
+        
+        #calculate the distance between the top and the bottom face        
+        delta = top_face.val().Center().sub(bottom_face.val().Center())
+
+        self.assertTupleAlmostEquals(delta.toTuple(),
+                                     (0.,0.,2.*h),
+                                     decimal_places)
+        
+        
+