367 lines
17 KiB
Python
367 lines
17 KiB
Python
#***************************************************************************
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#* Copyright (c) 2023 Werner Mayer <wmayer[at]users.sourceforge.net> *
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#* Copyright (c) 2023 <bgbsww@gmail.com> *
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#* *
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#* This file is part of FreeCAD. *
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#* *
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#* FreeCAD is free software: you can redistribute it and/or modify it *
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#* under the terms of the GNU Lesser General Public License as *
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#* published by the Free Software Foundation, either version 2.1 of the *
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#* License, or (at your option) any later version. *
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#* *
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#* FreeCAD is distributed in the hope that it will be useful, but *
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#* WITHOUT ANY WARRANTY; without even the implied warranty of *
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#* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
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#* Lesser General Public License for more details. *
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#* *
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#* You should have received a copy of the GNU Lesser General Public *
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#* License along with FreeCAD. If not, see *
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#* <https://www.gnu.org/licenses/>. *
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#* *
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#***************************************************************************
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from math import pi
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import unittest
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import FreeCAD
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from FreeCAD import Base
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import Part
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import Sketcher
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import TestSketcherApp
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""" Test various helixes """
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class TestHelix(unittest.TestCase):
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""" Test various helixes """
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def setUp(self):
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self.Doc = FreeCAD.newDocument("PartDesignTestHelix")
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def testHelicalTubeCase(self):
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body = self.Doc.addObject('PartDesign::Body','Body')
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sketch = body.newObject('Sketcher::SketchObject','Sketch')
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sketch.AttachmentSupport = (self.Doc.getObject('XY_Plane'),[''])
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sketch.MapMode = 'FlatFace'
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geoList = []
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geoList.append(Part.Circle(Base.Vector(-40.0, 0.0, 0.0), Base.Vector(0.0, 0.0, 1.0), 7.5))
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geoList.append(Part.Circle(Base.Vector(-40.0, 0.0, 0.0), Base.Vector(0.0, 0.0, 1.0), 10.0))
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sketch.addGeometry(geoList, False)
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del geoList
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sketch.addConstraint(Sketcher.Constraint('PointOnObject', 0, 3, -1))
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sketch.addConstraint(Sketcher.Constraint('Coincident', 1, 3, 0, 3))
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self.Doc.recompute()
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helix = body.newObject('PartDesign::AdditiveHelix','AdditiveHelix')
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helix.Profile = sketch
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helix.ReferenceAxis = (sketch, ['V_Axis'])
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helix.Mode = 0
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helix.Pitch = 35
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helix.Height = 100
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helix.Turns = 3
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helix.Angle = 0
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helix.Growth = 0
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helix.LeftHanded = 0
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helix.Reversed = 0
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self.Doc.recompute()
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self.assertEqual(len(helix.Shape.Solids), 1)
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def testCircleQ1(self):
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""" Test helix based on circle in Quadrant 1 """
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body = self.Doc.addObject('PartDesign::Body','Body')
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profileSketch = self.Doc.addObject('Sketcher::SketchObject', 'ProfileSketch')
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body.addObject(profileSketch)
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TestSketcherApp.CreateCircleSketch(profileSketch, (2, 0), 1)
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self.Doc.recompute()
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helix = self.Doc.addObject("PartDesign::AdditiveHelix","AdditiveHelix")
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body.addObject(helix)
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helix.Profile = profileSketch
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helix.ReferenceAxis = (profileSketch,"V_Axis")
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helix.Placement = FreeCAD.Placement(FreeCAD.Vector(0,0,0),
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FreeCAD.Rotation(FreeCAD.Vector(0,0,1),0),
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FreeCAD.Vector(0,0,0))
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helix.Pitch = 3
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helix.Height = 9
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helix.Turns = 2
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helix.Angle = 0
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helix.Mode = 1
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self.Doc.recompute()
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self.assertAlmostEqual(helix.Shape.Volume, 78.957,places=3)
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helix.Angle = 25
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self.Doc.recompute()
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self.assertAlmostEqual(helix.Shape.Volume, 134.17,places=2)
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profileSketch.addGeometry(Part.Circle(FreeCAD.Vector(2, 0, 0), FreeCAD.Vector(0,0,1), 0.5) )
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self.Doc.recompute()
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self.assertAlmostEqual(helix.Shape.Volume, 100.63,places=2)
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def testRectangle(self):
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""" Test helix based on a rectangle """
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body = self.Doc.addObject('PartDesign::Body','GearBody')
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gearSketch = self.Doc.addObject('Sketcher::SketchObject', 'GearSketch')
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body.addObject(gearSketch)
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TestSketcherApp.CreateRectangleSketch(gearSketch, (0, 0), (5, 5))
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self.Doc.recompute()
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# xz_plane = body.Origin.OriginFeatures[4]
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# coneSketch.AttachmentSupport = xz_plane
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# coneSketch.MapMode = 'FlatFace'
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helix = self.Doc.addObject("PartDesign::AdditiveHelix","AdditiveHelix")
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body.addObject(helix)
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helix.Profile = gearSketch
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helix.ReferenceAxis = (gearSketch,"V_Axis")
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helix.Placement = FreeCAD.Placement(FreeCAD.Vector(0,0,0), FreeCAD.Rotation(FreeCAD.Vector(0,0,1),0), FreeCAD.Vector(0,0,0))
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helix.Pitch = 50
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helix.Height = 150
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helix.Turns = 3
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helix.Angle = 0
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helix.Mode = 0
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self.Doc.recompute()
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bbox = helix.Shape.BoundBox
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self.assertAlmostEqual(bbox.YMin,0)
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# Computed exact value
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# with r = radius, l = length of square, t = turns
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# pi * r**2 * l * t
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expected = pi * 25 * 5 * 3
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self.assertAlmostEqual(helix.Shape.Volume, expected, places=2)
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def testGiantHelix(self):
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""" Test giant helix """
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_OCC_VERSION=[ int(v) for v in Part.OCC_VERSION.split('.') ]
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if _OCC_VERSION[0]>7 or (_OCC_VERSION[0]==7 and _OCC_VERSION[1]>3):
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mine=-1
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maxe=10
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else:
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mine=-1
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maxe=9
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for iexponent in range(mine,maxe):
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exponent = float(iexponent)
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body = self.Doc.addObject('PartDesign::Body','GearBody')
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gearSketch = self.Doc.addObject('Sketcher::SketchObject', 'GearSketch')
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body.addObject(gearSketch)
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TestSketcherApp.CreateRectangleSketch(gearSketch, (10*(10**exponent), 0), (1*(10**exponent), 1*(10**exponent)))
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xz_plane = body.Origin.OriginFeatures[4]
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gearSketch.AttachmentSupport = xz_plane
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gearSketch.MapMode = 'FlatFace'
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self.Doc.recompute()
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helix = self.Doc.addObject("PartDesign::AdditiveHelix","AdditiveHelix")
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body.addObject(helix)
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helix.Profile = gearSketch
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helix.ReferenceAxis = (gearSketch,"V_Axis")
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helix.Placement = FreeCAD.Placement(FreeCAD.Vector(0,0,0), FreeCAD.Rotation(FreeCAD.Vector(0,0,1),0), FreeCAD.Vector(0,0,0))
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helix.Pitch = 2*(10**exponent)
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helix.Turns = 2
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helix.Height = helix.Turns* helix.Pitch
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helix.Angle = 0
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helix.Mode = 0
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self.Doc.recompute()
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self.assertTrue(helix.Shape.isValid())
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bbox = helix.Shape.BoundBox
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self.assertAlmostEqual(bbox.ZMin/((10**exponent)**3),0,places=4)
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# Computed exact value
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# with r = radius, l = length of square, t = turns
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# pi * r**2 * l * t
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expected = pi * ( ((11*(10**exponent))**2) - ((10*(10**exponent))**2) ) * 1*(10**exponent) * helix.Turns
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self.assertAlmostEqual(helix.Shape.Volume/ ((10**exponent)**3),expected/ ((10**exponent)**3),places=2)
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def testGiantHelixAdditive(self):
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""" Test giant helix added to Cylinder """
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_OCC_VERSION=[ int(v) for v in Part.OCC_VERSION.split('.') ]
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if _OCC_VERSION[0]>7 or (_OCC_VERSION[0]==7 and _OCC_VERSION[1]>3):
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mine=-1
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maxe=8
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else:
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mine=-1
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maxe=6
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for iexponent in range(mine,maxe):
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exponent = float(iexponent)
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body = self.Doc.addObject('PartDesign::Body','GearBody')
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gearSketch = self.Doc.addObject('Sketcher::SketchObject', 'GearSketch')
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body.addObject(gearSketch)
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TestSketcherApp.CreateRectangleSketch(gearSketch, (10*(10**exponent), 0), (1*(10**exponent), 1*(10**exponent)))
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xz_plane = body.Origin.OriginFeatures[4]
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gearSketch.AttachmentSupport = xz_plane
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gearSketch.MapMode = 'FlatFace'
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self.Doc.recompute()
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cylinder = self.Doc.addObject('PartDesign::AdditiveCylinder','Cylinder')
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cylinder.Radius = 10*(10**exponent)
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cylinder.Height = 8*(10**exponent)
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cylinder.Angle = 360
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body.addObject(cylinder)
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self.Doc.recompute()
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helix = self.Doc.addObject("PartDesign::AdditiveHelix","AdditiveHelix")
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body.addObject(helix)
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helix.Profile = gearSketch
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helix.ReferenceAxis = (gearSketch,"V_Axis")
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helix.Placement = FreeCAD.Placement(FreeCAD.Vector(0,0,0), FreeCAD.Rotation(FreeCAD.Vector(0,0,1),0), FreeCAD.Vector(0,0,0))
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helix.Pitch = 2*(10**exponent)
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helix.Turns = 2.5 # workaround for OCCT bug with very large helices - full turns truncate the cylinder due to seam alignment
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helix.Height = helix.Turns* helix.Pitch
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helix.Angle = 0
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helix.Mode = 0
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self.Doc.recompute()
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self.assertTrue(helix.Shape.isValid())
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bbox = helix.Shape.BoundBox
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self.assertAlmostEqual(bbox.ZMin/((10**exponent)**3),0,places=4)
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# Computed exact value
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# with r = radius, l = length of square, t = turns
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# pi * r**2 * l * t
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cyl = pi * ((10*(10**exponent))**2) * 8*(10**exponent)
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expected = cyl + (pi * ( ((11*(10**exponent))**2) - ((10*(10**exponent))**2) ) * 1*(10**exponent) * helix.Turns )
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self.assertAlmostEqual(helix.Shape.Volume/ ((10**exponent)**3),expected/ ((10**exponent)**3),places=2)
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def testGiantHelixSubtractive(self):
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""" Test giant helix subtracted from Cylinder """
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_OCC_VERSION=[ int(v) for v in Part.OCC_VERSION.split('.') ]
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if _OCC_VERSION[0]>7 or (_OCC_VERSION[0]==7 and _OCC_VERSION[1]>3):
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mine=-1
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maxe=8
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else:
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mine=-1
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maxe=6
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for iexponent in range(mine,maxe):
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exponent = float(iexponent)
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body = self.Doc.addObject('PartDesign::Body','GearBody')
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gearSketch = self.Doc.addObject('Sketcher::SketchObject', 'GearSketch')
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body.addObject(gearSketch)
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TestSketcherApp.CreateRectangleSketch(gearSketch, (10*(10**exponent), 0), (1*(10**exponent), 1*(10**exponent)))
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xz_plane = body.Origin.OriginFeatures[4]
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gearSketch.AttachmentSupport = xz_plane
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gearSketch.MapMode = 'FlatFace'
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self.Doc.recompute()
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cylinder = self.Doc.addObject('PartDesign::AdditiveCylinder','Cylinder')
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cylinder.Radius = 11*(10**exponent)
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cylinder.Height = 8*(10**exponent)
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cylinder.Angle = 360
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body.addObject(cylinder)
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self.Doc.recompute()
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helix = self.Doc.addObject("PartDesign::SubtractiveHelix","SubtractiveHelix")
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body.addObject(helix)
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helix.Profile = gearSketch
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helix.ReferenceAxis = (gearSketch,"V_Axis")
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helix.Placement = FreeCAD.Placement(FreeCAD.Vector(0,0,0), FreeCAD.Rotation(FreeCAD.Vector(0,0,1),0), FreeCAD.Vector(0,0,0))
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helix.Pitch = 2*(10**exponent)
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helix.Turns = 2.5 # workaround for OCCT bug with very large helices - full turns truncate the cylinder due to seam alignment
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helix.Height = helix.Turns* helix.Pitch
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helix.Angle = 0
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helix.Mode = 0
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self.Doc.recompute()
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self.assertTrue(helix.Shape.isValid())
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bbox = helix.Shape.BoundBox
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self.assertAlmostEqual(bbox.ZMin/((10**exponent)**3),0,places=4)
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# Computed exact value
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# with r = radius, l = length of square, t = turns
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# pi * r**2 * l * t
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cyl = pi * ((11*(10**exponent))**2) * 8*(10**exponent)
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expected = cyl - (pi * ( ((11*(10**exponent))**2) - ((10*(10**exponent))**2) ) * 1*(10**exponent) * helix.Turns )
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self.assertAlmostEqual(helix.Shape.Volume/ ((10**exponent)**3),expected/ ((10**exponent)**3),places=2)
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def testCone(self):
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""" Test helix following a cone """
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body = self.Doc.addObject('PartDesign::Body','ConeBody')
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coneSketch = self.Doc.addObject('Sketcher::SketchObject', 'ConeSketch')
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body.addObject(coneSketch)
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geoList = []
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geoList.append(Part.LineSegment(FreeCAD.Vector(-5, -5, 0), FreeCAD.Vector(-3, 0, 0)) )
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geoList.append(Part.LineSegment(FreeCAD.Vector(-3, 0, 0), FreeCAD.Vector(-2, 0, 0)) )
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geoList.append(Part.LineSegment(FreeCAD.Vector(-2, 0, 0), FreeCAD.Vector(-4, -5, 0)) )
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geoList.append(Part.LineSegment(FreeCAD.Vector(-4, -5, 0), FreeCAD.Vector(-5, -5, 0)))
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(l1, l2, l3, l4) = coneSketch.addGeometry(geoList)
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conList = []
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conList.append(Sketcher.Constraint("Coincident", 0, 2, 1, 1))
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conList.append(Sketcher.Constraint("Coincident", 1, 2, 2, 1))
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conList.append(Sketcher.Constraint("Coincident", 2, 2, 3, 1))
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conList.append(Sketcher.Constraint("Coincident", 3, 2, 0, 1))
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conList.append(Sketcher.Constraint("Horizontal", 1))
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conList.append(Sketcher.Constraint("Angle", l3, 1, -2, 2, FreeCAD.Units.Quantity("30.000000 deg")))
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conList.append(Sketcher.Constraint("DistanceX", 1, 2, -5))
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conList.append(Sketcher.Constraint("DistanceY", 1, 2, 0))
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conList.append(Sketcher.Constraint("Equal", 0, 2))
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conList.append(Sketcher.Constraint("Equal", 1, 3))
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conList.append(Sketcher.Constraint("DistanceY", 0, 50))
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conList.append(Sketcher.Constraint("DistanceX", 1, 10))
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coneSketch.addConstraint(conList)
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xz_plane = body.Origin.OriginFeatures[4]
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coneSketch.AttachmentSupport = xz_plane
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coneSketch.MapMode = 'FlatFace'
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helix = self.Doc.addObject("PartDesign::AdditiveHelix","AdditiveHelix")
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body.addObject(helix)
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helix.Profile = coneSketch
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helix.ReferenceAxis = (coneSketch,"V_Axis")
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helix.Placement = FreeCAD.Placement(FreeCAD.Vector(0,0,0), FreeCAD.Rotation(FreeCAD.Vector(0,0,1),0), FreeCAD.Vector(0,0,0))
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helix.Pitch = 50
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helix.Height = 110
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helix.Turns = 2.2
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helix.Angle = 30
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helix.Mode = 0
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helix.Reversed = True
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self.Doc.recompute()
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self.assertAlmostEqual(helix.Shape.Volume/1e5, 3.8828,places=4)
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def testNegativeCone(self):
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""" Test helix following a cone with a negative angle """
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body = self.Doc.addObject('PartDesign::Body','ConeBody')
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coneSketch = self.Doc.addObject('Sketcher::SketchObject', 'ConeSketch')
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body.addObject(coneSketch)
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geoList = []
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geoList.append(Part.LineSegment(FreeCAD.Vector(5, 5, 0), FreeCAD.Vector(3, 0, 0)))
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geoList.append(Part.LineSegment(FreeCAD.Vector(3, 0, 0), FreeCAD.Vector(2, 0, 0)))
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geoList.append(Part.LineSegment(FreeCAD.Vector(2, 0, 0), FreeCAD.Vector(4, 5, 0)))
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geoList.append(Part.LineSegment(FreeCAD.Vector(4, 5, 0), FreeCAD.Vector(5, 5, 0)))
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(l1, l2, l3, l4) = coneSketch.addGeometry(geoList)
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conList = []
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conList.append(Sketcher.Constraint("Coincident", 0, 2, 1, 1))
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conList.append(Sketcher.Constraint("Coincident", 1, 2, 2, 1))
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conList.append(Sketcher.Constraint("Coincident", 2, 2, 3, 1))
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conList.append(Sketcher.Constraint("Coincident", 3, 2, 0, 1))
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conList.append(Sketcher.Constraint("Horizontal", 1))
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conList.append(Sketcher.Constraint("Angle", l3, 1, -2, 2, FreeCAD.Units.Quantity("30 deg")))
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conList.append(Sketcher.Constraint("DistanceX", 1, 2, -100))
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conList.append(Sketcher.Constraint("DistanceY", 1, 2, 0))
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conList.append(Sketcher.Constraint("Equal", 0, 2))
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conList.append(Sketcher.Constraint("Equal", 1, 3))
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conList.append(Sketcher.Constraint("DistanceY", 0, 50))
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conList.append(Sketcher.Constraint("DistanceX", 1, 10))
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coneSketch.addConstraint(conList)
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xz_plane = body.Origin.OriginFeatures[4]
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coneSketch.AttachmentSupport = xz_plane
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coneSketch.MapMode = 'FlatFace'
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helix = self.Doc.addObject("PartDesign::AdditiveHelix", "AdditiveHelix")
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body.addObject(helix)
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helix.Profile = coneSketch
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helix.ReferenceAxis = (coneSketch, "V_Axis")
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helix.Pitch = 50
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helix.Height = 110
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helix.Angle = -30
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helix.Mode = 0
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helix.Reversed = False
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self.Doc.recompute()
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self.assertAlmostEqual(helix.Shape.Volume/1e5, 6.0643, places=4)
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def tearDown(self):
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FreeCAD.closeDocument("PartDesignTestHelix")
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