606 lines
25 KiB
Python
606 lines
25 KiB
Python
#***************************************************************************
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#* *
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#* Copyright (c) 2011 *
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#* Yorik van Havre <yorik@uncreated.net> *
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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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__title__="FreeCAD Draft Snap tools"
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__author__ = "Yorik van Havre"
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__url__ = "http://free-cad.sourceforge.net"
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import FreeCAD, FreeCADGui, math, Draft, DraftGui, DraftTrackers
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from DraftGui import todo
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from draftlibs import fcvec
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from FreeCAD import Vector
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from pivy import coin
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from PyQt4 import QtCore,QtGui
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class Snapper:
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"""The Snapper objects contains all the functionality used by draft
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and arch module to manage object snapping. It is responsible for
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finding snap points and displaying snap markers. Usually You
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only need to invoke it's snap() function, all the rest is taken
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care of.
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3 functions are useful for the scriptwriter: snap(), constrain()
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or getPoint() which is an all-in-one combo.
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The indivudual snapToXXX() functions return a snap definition in
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the form [real_point,marker_type,visual_point], and are not
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meant to be used directly, they are all called when necessary by
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the general snap() function.
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"""
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def __init__(self):
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self.lastObj = [None,None]
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self.views = []
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self.maxEdges = 0
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self.radius = 0
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self.constraintAxis = None
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self.basepoint = None
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self.affinity = None
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self.cursorMode = None
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if Draft.getParam("maxSnap"):
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self.maxEdges = Draft.getParam("maxSnapEdges")
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# we still have no 3D view when the draft module initializes
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self.tracker = None
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self.extLine = None
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self.grid = None
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self.constrainLine = None
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self.trackLine = None
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# the snapmarker has "dot","circle" and "square" available styles
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self.mk = {'passive':'circle',
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'extension':'circle',
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'parallel':'circle',
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'grid':'circle',
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'endpoint':'dot',
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'midpoint':'dot',
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'perpendicular':'dot',
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'angle':'dot',
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'center':'dot',
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'ortho':'dot',
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'intersection':'dot'}
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self.cursors = {'passive':None,
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'extension':':/icons/Constraint_Parallel.svg',
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'parallel':':/icons/Constraint_Parallel.svg',
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'grid':':/icons/Constraint_PointOnPoint.svg',
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'endpoint':':/icons/Constraint_PointOnEnd.svg',
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'midpoint':':/icons/Constraint_PointOnObject.svg',
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'perpendicular':':/icons/Constraint_PointToObject.svg',
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'angle':':/icons/Constraint_ExternalAngle.svg',
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'center':':/icons/Constraint_Concentric.svg',
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'ortho':':/icons/Constraint_Perpendicular.svg',
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'intersection':':/icons/Constraint_Tangent.svg'}
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def snap(self,screenpos,lastpoint=None,active=True,constrain=False):
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"""snap(screenpos,lastpoint=None,active=True,constrain=False): returns a snapped
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point from the given (x,y) screenpos (the position of the mouse cursor), active is to
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activate active point snapping or not (passive), lastpoint is an optional
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other point used to draw an imaginary segment and get additional snap locations. Constrain can
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be True to constrain the point against the closest working plane axis.
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Screenpos can be a list, a tuple or a coin.SbVec2s object."""
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global Part,fcgeo
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import Part, SketcherGui
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from draftlibs import fcgeo
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def cstr(point):
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"constrains if needed"
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if constrain:
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return self.constrain(point,lastpoint)
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else:
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self.unconstrain()
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return point
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snaps = []
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# type conversion if needed
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if isinstance(screenpos,list):
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screenpos = tuple(screenpos)
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elif isinstance(screenpos,coin.SbVec2s):
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screenpos = tuple(screenpos.getValue())
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elif not isinstance(screenpos,tuple):
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print "snap needs valid screen position (list, tuple or sbvec2s)"
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return None
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# setup trackers if needed
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if not self.tracker:
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self.tracker = DraftTrackers.snapTracker()
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if not self.extLine:
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self.extLine = DraftTrackers.lineTracker(dotted=True)
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if (not self.grid) and Draft.getParam("grid"):
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self.grid = DraftTrackers.gridTracker()
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# getting current snap Radius
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if not self.radius:
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self.radius = self.getScreenDist(Draft.getParam("snapRange"),screenpos)
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# set the grid
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if self.grid and Draft.getParam("grid"):
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self.grid.set()
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# checking if alwaySnap setting is on
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oldActive = False
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if Draft.getParam("alwaysSnap"):
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oldActive = active
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active = True
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self.setCursor('passive')
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if self.tracker:
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self.tracker.off()
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if self.extLine:
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self.extLine.off()
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point = FreeCADGui.ActiveDocument.ActiveView.getPoint(screenpos[0],screenpos[1])
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# check if we snapped to something
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info = FreeCADGui.ActiveDocument.ActiveView.getObjectInfo((screenpos[0],screenpos[1]))
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# checking if parallel to one of the edges of the last objects
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point = self.snapToExtensions(point,lastpoint,constrain)
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if not info:
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# nothing has been snapped, check fro grid snap
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point = self.snapToGrid(point)
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return cstr(point)
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else:
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# we have an object to snap to
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obj = FreeCAD.ActiveDocument.getObject(info['Object'])
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if not obj:
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return cstr(point)
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if hasattr(obj.ViewObject,"Selectable"):
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if not obj.ViewObject.Selectable:
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return cstr(point)
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if not active:
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# passive snapping
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snaps = [self.snapToVertex(info)]
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else:
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# active snapping
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comp = info['Component']
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if obj.isDerivedFrom("Part::Feature"):
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if (not self.maxEdges) or (len(obj.Edges) <= self.maxEdges):
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if "Edge" in comp:
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# we are snapping to an edge
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edge = obj.Shape.Edges[int(comp[4:])-1]
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snaps.extend(self.snapToEndpoints(edge))
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snaps.extend(self.snapToMidpoint(edge))
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snaps.extend(self.snapToPerpendicular(edge,lastpoint))
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snaps.extend(self.snapToOrtho(edge,lastpoint,constrain))
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snaps.extend(self.snapToIntersection(edge))
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if isinstance (edge.Curve,Part.Circle):
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# the edge is an arc, we have extra options
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snaps.extend(self.snapToAngles(edge))
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snaps.extend(self.snapToCenter(edge))
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elif "Vertex" in comp:
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# directly snapped to a vertex
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snaps.append(self.snapToVertex(info,active=True))
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elif comp == '':
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# workaround for the new view provider
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snaps.append(self.snapToVertex(info,active=True))
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else:
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# all other cases (face, etc...) default to passive snap
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snapArray = [self.snapToVertex(info)]
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elif Draft.getType(obj) == "Dimension":
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# for dimensions we snap to their 3 points
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for pt in [obj.Start,obj.End,obj.Dimline]:
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snaps.append([pt,'endpoint',pt])
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elif Draft.getType(obj) == "Mesh":
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# for meshes we only snap to vertices
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snaps.extend(self.snapToEndpoints(obj.Mesh))
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# updating last objects list
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if not self.lastObj[1]:
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self.lastObj[1] = obj.Name
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elif self.lastObj[1] != obj.Name:
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self.lastObj[0] = self.lastObj[1]
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self.lastObj[1] = obj.Name
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if not snaps:
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return point
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# calculating the nearest snap point
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shortest = 1000000000000000000
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origin = Vector(info['x'],info['y'],info['z'])
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winner = [Vector(0,0,0),None,Vector(0,0,0)]
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for snap in snaps:
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# if snap[0] == None: print "debug: Snapper: 'i[0]' is 'None'"
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delta = snap[0].sub(origin)
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if delta.Length < shortest:
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shortest = delta.Length
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winner = snap
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# see if we are out of the max radius, if any
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if self.radius:
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dv = point.sub(winner[2])
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if (dv.Length > self.radius):
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if not oldActive:
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winner = self.snapToVertex(info)
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# setting the cursors
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if self.tracker:
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self.tracker.setCoords(winner[2])
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self.tracker.setMarker(self.mk[winner[1]])
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self.tracker.on()
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self.setCursor(winner[1])
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# return the final point
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return cstr(winner[2])
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def snapToExtensions(self,point,last,constrain):
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"returns a point snapped to extension or parallel line to last object, if any"
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tsnap = self.snapToExtOrtho(last,constrain)
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if tsnap:
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if (tsnap[0].sub(point)).Length < self.radius:
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if self.tracker:
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self.tracker.setCoords(tsnap[2])
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self.tracker.setMarker(self.mk[tsnap[1]])
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self.tracker.on()
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if self.extLine:
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self.extLine.p2(tsnap[2])
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self.extLine.on()
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self.setCursor(tsnap[1])
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return tsnap[2]
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for o in [self.lastObj[1],self.lastObj[0]]:
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if o:
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ob = FreeCAD.ActiveDocument.getObject(o)
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if ob:
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if ob.isDerivedFrom("Part::Feature"):
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edges = ob.Shape.Edges
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if (not self.maxEdges) or (len(edges) <= self.maxEdges):
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for e in edges:
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if isinstance(e.Curve,Part.Line):
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np = self.getPerpendicular(e,point)
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if not fcgeo.isPtOnEdge(np,e):
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if (np.sub(point)).Length < self.radius:
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if self.tracker:
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self.tracker.setCoords(np)
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self.tracker.setMarker(self.mk['extension'])
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self.tracker.on()
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if self.extLine:
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self.extLine.p1(e.Vertexes[0].Point)
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self.extLine.p2(np)
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self.extLine.on()
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self.setCursor('extension')
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return np
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else:
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if last:
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de = Part.Line(last,last.add(fcgeo.vec(e))).toShape()
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np = self.getPerpendicular(de,point)
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if (np.sub(point)).Length < self.radius:
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if self.tracker:
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self.tracker.setCoords(np)
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self.tracker.setMarker(self.mk['parallel'])
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self.tracker.on()
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self.setCursor('extension')
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return np
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return point
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def snapToGrid(self,point):
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"returns a grid snap point if available"
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if self.grid:
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np = self.grid.getClosestNode(point)
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if np:
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if self.radius != 0:
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dv = point.sub(np)
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if dv.Length <= self.radius:
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if self.tracker:
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self.tracker.setCoords(np)
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self.tracker.setMarker(self.mk['grid'])
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self.tracker.on()
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self.setCursor('grid')
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return np
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return point
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def snapToEndpoints(self,shape):
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"returns a list of enpoints snap locations"
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snaps = []
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if hasattr(shape,"Vertexes"):
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for v in shape.Vertexes:
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snaps.append([v.Point,'endpoint',v.Point])
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elif hasattr(shape,"Point"):
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snaps.append([shape.Point,'endpoint',shape.Point])
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elif hasattr(shape,"Points"):
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for v in shape.Points:
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snaps.append([v.Vector,'endpoint',v.Vector])
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return snaps
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def snapToMidpoint(self,shape):
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"returns a list of midpoints snap locations"
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snaps = []
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if isinstance(shape,Part.Edge):
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mp = fcgeo.findMidpoint(shape)
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if mp:
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snaps.append([mp,'midpoint',mp])
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return snaps
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def snapToPerpendicular(self,shape,last):
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"returns a list of perpendicular snap locations"
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snaps = []
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if last:
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if isinstance(shape,Part.Edge):
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if isinstance(shape.Curve,Part.Line):
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np = self.getPerpendicular(shape,last)
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elif isinstance(shape.Curve,Part.Circle):
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dv = last.sub(shape.Curve.Center)
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dv = fcvec.scaleTo(dv,shape.Curve.Radius)
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np = (shape.Curve.Center).add(dv)
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else:
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return snaps
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snaps.append([np,'perpendicular',np])
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return snaps
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def snapToOrtho(self,shape,last,constrain):
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"returns a list of ortho snap locations"
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snaps = []
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if constrain:
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if isinstance(shape,Part.Edge):
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if last:
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if isinstance(shape.Curve,Part.Line):
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if self.constraintAxis:
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tmpEdge = Part.Line(last,last.add(self.constraintAxis)).toShape()
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# get the intersection points
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pt = fcgeo.findIntersection(tmpEdge,shape,True,True)
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if pt:
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for p in pt:
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snaps.append([p,'ortho',p])
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return snaps
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def snapToExtOrtho(self,last,constrain):
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"returns an ortho X extension snap location"
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if constrain and last and self.constraintAxis and self.extLine:
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tmpEdge1 = Part.Line(last,last.add(self.constraintAxis)).toShape()
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tmpEdge2 = Part.Line(self.extLine.p1(),self.extLine.p2()).toShape()
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# get the intersection points
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pt = fcgeo.findIntersection(tmpEdge1,tmpEdge2,True,True)
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if pt:
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return [pt[0],'ortho',pt[0]]
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return None
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def snapToAngles(self,shape):
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"returns a list of angle snap locations"
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snaps = []
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rad = shape.Curve.Radius
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pos = shape.Curve.Center
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for i in [0,30,45,60,90,120,135,150,180,210,225,240,270,300,315,330]:
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ang = math.radians(i)
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cur = Vector(math.sin(ang)*rad+pos.x,math.cos(ang)*rad+pos.y,pos.z)
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snaps.append([cur,'angle',cur])
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return snaps
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def snapToCenter(self,shape):
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"returns a list of center snap locations"
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snaps = []
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rad = shape.Curve.Radius
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pos = shape.Curve.Center
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for i in [15,37.5,52.5,75,105,127.5,142.5,165,195,217.5,232.5,255,285,307.5,322.5,345]:
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ang = math.radians(i)
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cur = Vector(math.sin(ang)*rad+pos.x,math.cos(ang)*rad+pos.y,pos.z)
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snaps.append([cur,'center',pos])
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return snaps
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def snapToIntersection(self,shape):
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"returns a list of intersection snap locations"
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snaps = []
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# get the stored objects to calculate intersections
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if self.lastObj[0]:
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obj = FreeCAD.ActiveDocument.getObject(self.lastObj[0])
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if obj:
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if obj.isDerivedFrom("Part::Feature"):
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if (not self.maxEdges) or (len(obj.Shape.Edges) <= self.maxEdges):
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for e in obj.Shape.Edges:
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# get the intersection points
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pt = fcgeo.findIntersection(e,shape)
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if pt:
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for p in pt:
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snaps.append([p,'intersection',p])
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return snaps
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def snapToVertex(self,info,active=False):
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p = Vector(info['x'],info['y'],info['z'])
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if active:
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return [p,'endpoint',p]
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else:
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return [p,'passive',p]
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def getScreenDist(self,dist,cursor):
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"returns a distance in 3D space from a screen pixels distance"
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p1 = FreeCADGui.ActiveDocument.ActiveView.getPoint(cursor)
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p2 = FreeCADGui.ActiveDocument.ActiveView.getPoint((cursor[0]+dist,cursor[1]))
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return (p2.sub(p1)).Length
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def getPerpendicular(self,edge,pt):
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"returns a point on an edge, perpendicular to the given point"
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dv = pt.sub(edge.Vertexes[0].Point)
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nv = fcvec.project(dv,fcgeo.vec(edge))
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np = (edge.Vertexes[0].Point).add(nv)
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return np
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def setCursor(self,mode=None):
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"setCursor(self,mode=None): sets or resets the cursor to the given mode or resets"
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if not mode:
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for v in self.views:
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v.unsetCursor()
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self.views = []
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else:
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if mode != self.cursorMode:
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if not self.views:
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mw = DraftGui.getMainWindow()
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self.views = mw.findChildren(QtGui.QWidget,"QtGLArea")
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baseicon = QtGui.QPixmap(":/icons/Draft_Cursor.svg")
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newicon = QtGui.QPixmap(32,24)
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newicon.fill(QtCore.Qt.transparent)
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qp = QtGui.QPainter()
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qp.begin(newicon)
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qp.drawPixmap(0,0,baseicon)
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if not (mode == 'passive'):
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tp = QtGui.QPixmap(self.cursors[mode]).scaledToWidth(16)
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qp.drawPixmap(QtCore.QPoint(16, 8), tp);
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qp.end()
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cur = QtGui.QCursor(newicon,8,8)
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for v in self.views:
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v.setCursor(cur)
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self.cursorMode = mode
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def off(self):
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"finishes snapping"
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if self.tracker:
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self.tracker.off()
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if self.extLine:
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self.extLine.off()
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if self.grid:
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self.grid.off()
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if self.constrainLine:
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self.constrainLine.off()
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self.radius = 0
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self.setCursor()
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self.cursorMode = None
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def constrain(self,point,basepoint=None,axis=None):
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'''constrain(point,basepoint=None,axis=None: Returns a
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constrained point. Axis can be "x","y" or "z" or a custom vector. If None,
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the closest working plane axis will be picked.
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Basepoint is the base point used to figure out from where the point
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must be constrained. If no basepoint is given, the current point is
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used as basepoint.'''
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point = Vector(point)
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# setup trackers if needed
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if not self.constrainLine:
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self.constrainLine = DraftTrackers.lineTracker(dotted=True)
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# setting basepoint
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if not basepoint:
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if not self.basepoint:
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self.basepoint = point
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else:
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self.basepoint = basepoint
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delta = point.sub(self.basepoint)
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# setting constraint axis
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self.affinity = FreeCAD.DraftWorkingPlane.getClosestAxis(delta)
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if isinstance(axis,FreeCAD.Vector):
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self.constraintAxis = axis
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elif axis == "x":
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self.constraintAxis = FreeCAD.DraftWorkingPlane.u
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elif axis == "y":
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self.constraintAxis = FreeCAD.DraftWorkingPlane.v
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elif axis == "z":
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self.constraintAxis = FreeCAD.DraftWorkingPlane.axis
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else:
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if self.affinity == "x":
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self.constraintAxis = FreeCAD.DraftWorkingPlane.u
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elif self.affinity == "y":
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self.constraintAxis = FreeCAD.DraftWorkingPlane.v
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else:
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self.constraintAxis = FreeCAD.DraftWorkingPlane.axis
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# calculating constrained point
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cdelta = fcvec.project(delta,self.constraintAxis)
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npoint = self.basepoint.add(cdelta)
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# setting constrain line
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if self.constrainLine:
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if point != npoint:
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self.constrainLine.p1(point)
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self.constrainLine.p2(npoint)
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self.constrainLine.on()
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else:
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self.constrainLine.off()
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return npoint
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def unconstrain(self):
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self.basepoint = None
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self.affinity = None
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if self.constrainLine:
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self.constrainLine.off()
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def getPoint(self,last=None,callback=None):
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"""getPoint([last],[callback]) : gets a 3D point from the screen. You can provide an existing point,
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in that case additional snap options and a tracker are available. You can also passa function as
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callback, which will get called with the resulting point as argument, when a point is clicked:
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def cb(point):
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print "got a 3D point: ",point
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FreeCADGui.Snapper.getPoint(callback=cb)
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"""
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self.pt = None
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self.ui = FreeCADGui.draftToolBar
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self.view = FreeCADGui.ActiveDocument.ActiveView
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# setting a track line if we got an existing point
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if last:
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if not self.trackLine:
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self.trackLine = DraftTrackers.lineTracker()
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self.trackLine.p1(last)
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self.trackLine.on()
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def move(event_cb):
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event = event_cb.getEvent()
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mousepos = event.getPosition()
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ctrl = event.wasCtrlDown()
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shift = event.wasShiftDown()
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self.pt = FreeCADGui.Snapper.snap(mousepos,lastpoint=last,active=ctrl,constrain=shift)
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self.ui.displayPoint(self.pt,last,plane=FreeCAD.DraftWorkingPlane,mask=FreeCADGui.Snapper.affinity)
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if self.trackLine:
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self.trackLine.p2(self.pt)
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def click(event_cb):
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event = event_cb.getEvent()
|
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if event.getState() == coin.SoMouseButtonEvent.DOWN:
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self.view.removeEventCallbackPivy(coin.SoMouseButtonEvent.getClassTypeId(),self.callbackClick)
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self.view.removeEventCallbackPivy(coin.SoLocation2Event.getClassTypeId(),self.callbackMove)
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FreeCADGui.Snapper.off()
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self.ui.offUi()
|
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if self.trackLine:
|
|
self.trackLine.off()
|
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if callback:
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|
callback(self.pt)
|
|
self.pt = None
|
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|
|
# adding 2 callback functions
|
|
self.ui.pointUi()
|
|
self.callbackClick = self.view.addEventCallbackPivy(coin.SoMouseButtonEvent.getClassTypeId(),click)
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|
self.callbackMove = self.view.addEventCallbackPivy(coin.SoLocation2Event.getClassTypeId(),move)
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|
|
if not hasattr(FreeCADGui,"Snapper"):
|
|
FreeCADGui.Snapper = Snapper()
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