145 lines
6.1 KiB
Python
145 lines
6.1 KiB
Python
# ***************************************************************************
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# * Copyright (c) 2009, 2010 Yorik van Havre <yorik@uncreated.net> *
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# * Copyright (c) 2009, 2010 Ken Cline <cline@frii.com> *
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# * Copyright (c) 2020 FreeCAD Developers *
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# * *
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# * This program is free software; you can redistribute it and/or modify *
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# * it under the terms of the GNU Lesser General Public License (LGPL) *
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# * as published by the Free Software Foundation; either version 2 of *
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# * the License, or (at your option) any later version. *
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# * for detail see the LICENCE text file. *
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# * *
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# * This program is distributed in the hope that it will be useful, *
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# * but WITHOUT ANY WARRANTY; without even the implied warranty of *
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# * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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# * GNU Library General Public License for more details. *
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# * *
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# * You should have received a copy of the GNU Library General Public *
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# * License along with this program; if not, write to the Free Software *
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# * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 *
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# * USA *
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# * *
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# ***************************************************************************
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"""Provides the object code for the BSpline object."""
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## @package bspline
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# \ingroup draftobjects
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# \brief Provides the object code for the BSpline object.
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## \addtogroup draftobjects
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# @{
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from PySide.QtCore import QT_TRANSLATE_NOOP
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import FreeCAD as App
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from draftobjects.base import DraftObject
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from draftutils import params
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class BSpline(DraftObject):
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"""The BSpline object"""
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def __init__(self, obj):
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super(BSpline, self).__init__(obj, "BSpline")
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_tip = QT_TRANSLATE_NOOP("App::Property",
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"The points of the B-spline")
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obj.addProperty("App::PropertyVectorList","Points", "Draft", _tip)
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_tip = QT_TRANSLATE_NOOP("App::Property",
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"If the B-spline is closed or not")
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obj.addProperty("App::PropertyBool","Closed", "Draft", _tip)
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_tip = QT_TRANSLATE_NOOP("App::Property",
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"Create a face if this spline is closed")
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obj.addProperty("App::PropertyBool","MakeFace", "Draft",_tip)
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_tip = QT_TRANSLATE_NOOP("App::Property", "The area of this object")
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obj.addProperty("App::PropertyArea","Area", "Draft", _tip)
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obj.MakeFace = params.get_param("fillmode")
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obj.Closed = False
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obj.Points = []
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self.assureProperties(obj)
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def assureProperties(self, obj): # for Compatibility with older versions
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if not hasattr(obj, "Parameterization"):
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_tip = QT_TRANSLATE_NOOP("App::Property","Parameterization factor")
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obj.addProperty("App::PropertyFloat", "Parameterization", "Draft", _tip)
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obj.Parameterization = 1.0
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self.knotSeq = []
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def parameterization (self, pts, a, closed):
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"""Computes a knot Sequence for a set of points.
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fac (0-1) : parameterization factor
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fac = 0 -> Uniform / fac=0.5 -> Centripetal / fac=1.0 -> Chord-Length
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"""
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if closed: # we need to add the first point as the end point
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pts.append(pts[0])
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params = [0]
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for i in range(1,len(pts)):
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p = pts[i].sub(pts[i-1])
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pl = pow(p.Length,a)
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params.append(params[-1] + pl)
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return params
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def onChanged(self, fp, prop):
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self.props_changed_store(prop)
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if prop == "Parameterization":
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if fp.Parameterization < 0.:
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fp.Parameterization = 0.
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if fp.Parameterization > 1.0:
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fp.Parameterization = 1.0
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def execute(self, obj):
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if self.props_changed_placement_only() \
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or not obj.Points:
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obj.positionBySupport()
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self.props_changed_clear()
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return
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import Part
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self.assureProperties(obj)
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self.knotSeq = self.parameterization(obj.Points, obj.Parameterization, obj.Closed)
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plm = obj.Placement
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if obj.Closed and (len(obj.Points) > 2):
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if obj.Points[0] == obj.Points[-1]: # should not occur, but OCC will crash
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_err = QT_TRANSLATE_NOOP('Draft', "_BSpline.createGeometry: "
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"Closed with same first/last Point. Geometry not updated.")
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App.Console.PrintError(_err+"\n")
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return
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spline = Part.BSplineCurve()
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spline.interpolate(obj.Points, PeriodicFlag = True, Parameters = self.knotSeq)
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# DNC: bug fix: convert to face if closed
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shape = Part.Wire(spline.toShape())
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# Creating a face from a closed spline cannot be expected to always work
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# Usually, if the spline is not flat the call of Part.Face() fails
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try:
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if hasattr(obj,"MakeFace"):
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if obj.MakeFace:
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shape = Part.Face(shape)
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else:
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shape = Part.Face(shape)
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except Part.OCCError:
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pass
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obj.Shape = shape
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if hasattr(obj,"Area") and hasattr(shape,"Area"):
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obj.Area = shape.Area
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else:
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spline = Part.BSplineCurve()
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spline.interpolate(obj.Points, PeriodicFlag = False, Parameters = self.knotSeq)
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shape = spline.toShape()
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obj.Shape = shape
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if hasattr(obj,"Area") and hasattr(shape,"Area"):
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obj.Area = shape.Area
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obj.Placement = plm
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obj.positionBySupport()
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self.props_changed_clear()
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# Alias for compatibility with v0.18 and earlier
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_BSpline = BSpline
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## @}
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