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# * Copyright (c) 2012 Jan Rheinländer <jrheinlaender@users.sourceforge.net> *
# * *
# * This file is part of the FreeCAD CAx development system. *
# * *
# * This library is free software; you can redistribute it and/or *
# * modify it under the terms of the GNU Library General Public *
# * License as published by the Free Software Foundation; either *
# * version 2 of the License, or (at your option) any later version. *
# * *
# * This library 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 this library; see the file COPYING.LIB. If not, *
# * write to the Free Software Foundation, Inc., 59 Temple Place, *
# * Suite 330, Boston, MA 02111-1307, USA *
# * *
# ******************************************************************************/
import FreeCAD, FreeCADGui
import Part, Sketcher
class ShaftFeature:
"Creates and updates the feature of the shaft"
App = FreeCAD
Gui = FreeCADGui
def __init__(self, doc):
"Create new feature"
self.Doc = doc
# TODO: Discover existing sketch and get data from it
self.sketch = self.Doc.addObject("Sketcher::SketchObject", "SketchShaft")
self.sketch.Placement = self.App.Placement(
self.App.Vector(0, 0, 0), self.App.Rotation(0, 0, 0, 1)
)
self.feature = 0
self.segments = 0 # number of segments
self.totalLength = 0 # total length of all segments
self.lastRadius = 0 # radius of last segment (required for adding segments)
def addSegment(self, length, diameter, innerdiameter):
"Add a segment at the end of the shaft"
# Find constraint indices of vertical line constraint, horizontal line constraint
# FIXME: Should have a unique id instead of indices that might change with user editing
# 0-3 belong to the centerline
# 4-6 to the first vertical section
# 7-9 to the first horizontal section
# 10-12 to the second vertical section
# etc. etc.
constrRadius = 4 + self.segments * 6
constrLength = 7 + self.segments * 6
constrInnerRadius = 1 + self.segments * 6
# Find line index of vertical segment, horizontal segment, last shaft segment
# FIXME: Should have a unique id instead of indices that might change with user editing
segRadius = 1 + self.segments * 2
segLength = 2 + self.segments * 2
prevSegLength = 0 + self.segments * 2
prevSegEnd = 3 + (self.segments - 1) * 2
segEnd = prevSegEnd + 2
radius = diameter / 2
innerradius = innerdiameter / 2
oldLength = self.totalLength
self.totalLength += length
self.segments += 1
if oldLength == 0:
# First segment of shaft
# Create centerline
self.sketch.addGeometry(
Part.LineSegment(self.App.Vector(0, 0, 0), self.App.Vector(self.totalLength, 0, 0))
)
self.sketch.addConstraint(
Sketcher.Constraint("DistanceX", 0, self.totalLength)
) # Constraint1
self.sketch.addConstraint(
Sketcher.Constraint("DistanceY", -1, 1, 0, 1, innerradius)
) # Constraint2
self.sketch.addConstraint(Sketcher.Constraint("PointOnObject", 0, 1, -2)) # Constraint3
self.sketch.addConstraint(Sketcher.Constraint("Horizontal", 0)) # Constraint4
# Create first segment
self.sketch.addGeometry(
Part.LineSegment(self.App.Vector(0, innerradius, 0), self.App.Vector(0, radius, 0))
)
self.sketch.addConstraint(
Sketcher.Constraint("DistanceY", -1, 1, 1, 2, radius)
) # Constraint5
self.sketch.addConstraint(Sketcher.Constraint("Coincident", 0, 1, 1, 1)) # Constraint6
self.sketch.addConstraint(Sketcher.Constraint("Vertical", 1)) # Constraint7
self.sketch.addGeometry(
Part.LineSegment(self.App.Vector(0, radius, 0), self.App.Vector(length, radius, 0))
)
self.sketch.addConstraint(Sketcher.Constraint("DistanceX", 2, length)) # Constraint8
self.sketch.addConstraint(Sketcher.Constraint("Coincident", 2, 1, 1, 2)) # Constraint9
self.sketch.addConstraint(Sketcher.Constraint("Horizontal", 2)) # Constraint10
else:
# remove line that closes the shaft
self.sketch.delGeometry(prevSegEnd)
# TODO: Delete the two constraints? Or will they disappear automatically?
# Adjust length of centerline
self.sketch.setDatum(0, self.totalLength)
# Add segment at the end
self.sketch.addGeometry(
Part.LineSegment(
self.App.Vector(oldLength, self.lastRadius, 0),
self.App.Vector(oldLength, radius, 0),
)
)
self.sketch.addConstraint(Sketcher.Constraint("DistanceY", -1, 1, segRadius, 2, radius))
self.sketch.addConstraint(
Sketcher.Constraint("Coincident", segRadius, 1, prevSegLength, 2)
)
self.sketch.addConstraint(Sketcher.Constraint("Vertical", segRadius))
self.sketch.addGeometry(
Part.LineSegment(
self.App.Vector(oldLength, radius, 0),
self.App.Vector(oldLength + length, radius, 0),
)
)
self.sketch.addConstraint(Sketcher.Constraint("DistanceX", segLength, length))
self.sketch.addConstraint(Sketcher.Constraint("Coincident", segLength, 1, segRadius, 2))
self.sketch.addConstraint(Sketcher.Constraint("Horizontal", segLength))
# close the sketch
self.sketch.addGeometry(
Part.LineSegment(
self.App.Vector(oldLength + length, radius, 0),
self.App.Vector(oldLength + length, innerradius, 0),
)
)
self.sketch.addConstraint(Sketcher.Constraint("Coincident", 0, 2, segEnd, 2))
self.sketch.addConstraint(Sketcher.Constraint("Coincident", segEnd, 1, segLength, 2))
self.lastRadius = radius
if oldLength == 0:
# create feature
self.feature = self.Doc.addObject("PartDesign::Revolution", "RevolutionShaft")
self.feature.Profile = self.sketch
self.feature.ReferenceAxis = (self.sketch, ["H_Axis"])
self.feature.Angle = 360.0
self.Doc.recompute()
self.Gui.hide("SketchShaft")
else:
self.Doc.recompute()
# FIXME: Will give a warning in the console if the active window is not the feature
self.Gui.SendMsgToActiveView("ViewFit")
def updateSegment(self, segment, oldLength, length, diameter, innerdiameter):
constrRadius = 4 + segment * 6
constrLength = 7 + segment * 6
constrInnerRadius = 1 # Currently we don't allow multiple different innner diameters
# update total length
self.totalLength = self.totalLength - oldLength + length
# Adjust length of centerline
self.sketch.setDatum(0, self.totalLength)
# Adjust segment length
self.sketch.setDatum(constrLength, length)
# Adjust diameter
self.sketch.setDatum(constrRadius, diameter / 2)
# Adjust inner diameter
self.sketch.setDatum(constrInnerRadius, innerdiameter / 2)
# Update feature
self.Doc.recompute()
self.Gui.SendMsgToActiveView("ViewFit")
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