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DraftSnap.py
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DraftSnap.py
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#***************************************************************************
#* *
#* Copyright (c) 2011 *
#* Yorik van Havre <yorik@uncreated.net> *
#* *
#* This program is free software; you can redistribute it and/or modify *
#* it under the terms of the GNU Lesser General Public License (LGPL) *
#* as published by the Free Software Foundation; either version 2 of *
#* the License, or (at your option) any later version. *
#* for detail see the LICENCE text file. *
#* *
#* This program 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 program; if not, write to the Free Software *
#* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 *
#* USA *
#* *
#***************************************************************************
__title__="FreeCAD Draft Snap tools"
__author__ = "Yorik van Havre"
__url__ = "http://www.freecadweb.org"
import FreeCAD, FreeCADGui, math, Draft, DraftGui, DraftTrackers, DraftVecUtils
from FreeCAD import Vector
from pivy import coin
from PySide import QtCore,QtGui
class Snapper:
"""The Snapper objects contains all the functionality used by draft
and arch module to manage object snapping. It is responsible for
finding snap points and displaying snap markers. Usually You
only need to invoke it's snap() function, all the rest is taken
care of.
3 functions are useful for the scriptwriter: snap(), constrain()
or getPoint() which is an all-in-one combo.
The indivudual snapToXXX() functions return a snap definition in
the form [real_point,marker_type,visual_point], and are not
meant to be used directly, they are all called when necessary by
the general snap() function.
The Snapper lives inside FreeCADGui once the Draft module has been
loaded.
"""
def __init__(self):
self.lastObj = [None,None]
self.maxEdges = 0
self.radius = 0
self.constraintAxis = None
self.basepoint = None
self.affinity = None
self.mask = None
self.cursorMode = None
if Draft.getParam("maxSnap",0):
self.maxEdges = Draft.getParam("maxSnapEdges",0)
self.snapStyle = Draft.getParam("snapStyle",0)
# we still have no 3D view when the draft module initializes
self.tracker = None
self.extLine = None
self.grid = None
self.constrainLine = None
self.trackLine = None
self.extLine2 = None
self.radiusTracker = None
self.dim1 = None
self.dim2 = None
self.snapInfo = None
self.lastSnappedObject = None
self.lastArchPoint = None
self.active = True
self.forceGridOff = False
self.lastExtensions = []
# the trackers are stored in lists because there can be several views, each with its own set
self.trackers = [[],[],[],[],[],[],[],[],[]] # view, grid, snap, extline, radius, dim1, dim2, trackLine, extline2
self.polarAngles = [90,45]
self.selectMode = False
# the snapmarker has "dot","circle" and "square" available styles
if self.snapStyle:
self.mk = {'passive':'empty',
'extension':'empty',
'parallel':'empty',
'grid':'quad',
'endpoint':'quad',
'midpoint':'quad',
'perpendicular':'quad',
'angle':'quad',
'center':'quad',
'ortho':'quad',
'intersection':'quad'}
else:
self.mk = {'passive':'circle',
'extension':'circle',
'parallel':'circle',
'grid':'circle',
'endpoint':'dot',
'midpoint':'square',
'perpendicular':'dot',
'angle':'square',
'center':'dot',
'ortho':'dot',
'intersection':'dot'}
self.cursors = {'passive':':/icons/Snap_Near.svg',
'extension':':/icons/Snap_Extension.svg',
'parallel':':/icons/Snap_Parallel.svg',
'grid':':/icons/Snap_Grid.svg',
'endpoint':':/icons/Snap_Endpoint.svg',
'midpoint':':/icons/Snap_Midpoint.svg',
'perpendicular':':/icons/Snap_Perpendicular.svg',
'angle':':/icons/Snap_Angle.svg',
'center':':/icons/Snap_Center.svg',
'ortho':':/icons/Snap_Ortho.svg',
'intersection':':/icons/Snap_Intersection.svg'}
def snap(self,screenpos,lastpoint=None,active=True,constrain=False,noTracker=False):
"""snap(screenpos,lastpoint=None,active=True,constrain=False,noTracker=False): returns a snapped
point from the given (x,y) screenpos (the position of the mouse cursor), active is to
activate active point snapping or not (passive), lastpoint is an optional
other point used to draw an imaginary segment and get additional snap locations. Constrain can
be True to constrain the point against the closest working plane axis.
Screenpos can be a list, a tuple or a coin.SbVec2s object. If noTracker is True,
the tracking line is not displayed."""
global Part, DraftGeomUtils
import Part, DraftGeomUtils
if not hasattr(self,"toolbar"):
self.makeSnapToolBar()
mw = FreeCADGui.getMainWindow()
bt = mw.findChild(QtGui.QToolBar,"Draft Snap")
if not bt:
mw.addToolBar(self.toolbar)
else:
if Draft.getParam("showSnapBar",True):
bt.show()
def cstr(point):
"constrains if needed"
if constrain or self.mask:
fpt = self.constrain(point,lastpoint)
else:
self.unconstrain()
fpt = point
if self.radiusTracker:
self.radiusTracker.update(fpt)
return fpt
snaps = []
self.snapInfo = None
# type conversion if needed
if isinstance(screenpos,list):
screenpos = tuple(screenpos)
elif isinstance(screenpos,coin.SbVec2s):
screenpos = tuple(screenpos.getValue())
elif not isinstance(screenpos,tuple):
print("snap needs valid screen position (list, tuple or sbvec2s)")
return None
# setup trackers if needed
self.setTrackers()
# getting current snap Radius
self.radius = self.getScreenDist(Draft.getParam("snapRange",5),screenpos)
if self.radiusTracker:
self.radiusTracker.update(self.radius)
self.radiusTracker.off()
# activate snap
oldActive = False
if Draft.getParam("alwaysSnap",True):
oldActive = active
active = True
if not self.active:
active = False
self.setCursor('passive')
if self.tracker:
self.tracker.off()
if self.extLine:
self.extLine2.off()
if self.extLine:
self.extLine.off()
if self.trackLine:
self.trackLine.off()
if self.dim1:
self.dim1.off()
if self.dim2:
self.dim2.off()
point = self.getApparentPoint(screenpos[0],screenpos[1])
# setup a track line if we got a last point
if lastpoint:
if self.trackLine:
self.trackLine.p1(lastpoint)
# check if we snapped to something
self.snapInfo = Draft.get3DView().getObjectInfo((screenpos[0],screenpos[1]))
# checking if parallel to one of the edges of the last objects or to a polar direction
if active:
eline = None
point,eline = self.snapToPolar(point,lastpoint)
point,eline = self.snapToExtensions(point,lastpoint,constrain,eline)
if not self.snapInfo:
# nothing has been snapped
# check for grid snap and ext crossings
if active:
epoint = self.snapToCrossExtensions(point)
if epoint:
point = epoint
else:
point = self.snapToGrid(point)
fp = cstr(point)
if self.trackLine and lastpoint and (not noTracker):
self.trackLine.p2(fp)
self.trackLine.on()
# set the arch point tracking
if self.lastArchPoint:
self.setArchDims(self.lastArchPoint,fp)
return fp
else:
# we have an object to snap to
obj = FreeCAD.ActiveDocument.getObject(self.snapInfo['Object'])
if not obj:
return cstr(point)
self.lastSnappedObject = obj
if hasattr(obj.ViewObject,"Selectable"):
if not obj.ViewObject.Selectable:
return cstr(point)
if not active:
# passive snapping
snaps = [self.snapToVertex(self.snapInfo)]
else:
# first stick to the snapped object
s = self.snapToVertex(self.snapInfo)
if s:
point = s[0]
snaps = [s]
# active snapping
comp = self.snapInfo['Component']
archSnap = FreeCAD.ParamGet("User parameter:BaseApp/Preferences/Mod/Arch").GetBool("ArchSnapToBase",True)
if (Draft.getType(obj) == "Wall") and (not oldActive) and archSnap:
# special snapping for wall: only to its base shape (except when CTRL is pressed)
edges = []
for o in [obj]+obj.Additions:
if Draft.getType(o) == "Wall":
if o.Base:
edges.extend(o.Base.Shape.Edges)
for edge in edges:
snaps.extend(self.snapToEndpoints(edge))
snaps.extend(self.snapToMidpoint(edge))
snaps.extend(self.snapToPerpendicular(edge,lastpoint))
snaps.extend(self.snapToIntersection(edge))
snaps.extend(self.snapToElines(edge,eline))
elif (Draft.getType(obj) == "Structure") and (not oldActive) and archSnap:
# special snapping for struct: only to its base point (except when CTRL is pressed)
if obj.Base:
for edge in obj.Base.Shape.Edges:
snaps.extend(self.snapToEndpoints(edge))
snaps.extend(self.snapToMidpoint(edge))
snaps.extend(self.snapToPerpendicular(edge,lastpoint))
snaps.extend(self.snapToIntersection(edge))
snaps.extend(self.snapToElines(edge,eline))
else:
b = obj.Placement.Base
snaps.append([b,'endpoint',self.toWP(b)])
elif obj.isDerivedFrom("Part::Feature"):
if Draft.getType(obj) == "Polygon":
# special snapping for polygons: add the center
snaps.extend(self.snapToPolygon(obj))
if (not self.maxEdges) or (len(obj.Edges) <= self.maxEdges):
if "Edge" in comp:
# we are snapping to an edge
en = int(comp[4:])-1
if len(obj.Shape.Edges) > en:
edge = obj.Shape.Edges[en]
snaps.extend(self.snapToEndpoints(edge))
snaps.extend(self.snapToMidpoint(edge))
snaps.extend(self.snapToPerpendicular(edge,lastpoint))
#snaps.extend(self.snapToOrtho(edge,lastpoint,constrain)) # now part of snapToPolar
snaps.extend(self.snapToIntersection(edge))
snaps.extend(self.snapToElines(edge,eline))
et = DraftGeomUtils.geomType(edge)
if et == "Circle":
# the edge is an arc, we have extra options
snaps.extend(self.snapToAngles(edge))
snaps.extend(self.snapToCenter(edge))
elif et == "Ellipse":
# extra ellipse options
snaps.extend(self.snapToCenter(edge))
elif "Vertex" in comp:
# directly snapped to a vertex
snaps.append(self.snapToVertex(self.snapInfo,active=True))
elif comp == '':
# workaround for the new view provider
snaps.append(self.snapToVertex(self.snapInfo,active=True))
else:
# all other cases (face, etc...) default to passive snap
snapArray = [self.snapToVertex(self.snapInfo)]
elif Draft.getType(obj) == "Dimension":
# for dimensions we snap to their 2 points:
if obj.ViewObject:
if hasattr(obj.ViewObject.Proxy,"p2") and hasattr(obj.ViewObject.Proxy,"p3"):
snaps.append([obj.ViewObject.Proxy.p2,'endpoint',self.toWP(obj.ViewObject.Proxy.p2)])
snaps.append([obj.ViewObject.Proxy.p3,'endpoint',self.toWP(obj.ViewObject.Proxy.p3)])
#for pt in [obj.Start,obj.End,obj.Dimline]:
# snaps.append([pt,'endpoint',self.toWP(pt)])
elif Draft.getType(obj) == "Axis":
for edge in obj.Shape.Edges:
snaps.extend(self.snapToEndpoints(edge))
elif Draft.getType(obj) == "Mesh":
# for meshes we only snap to vertices
snaps.extend(self.snapToEndpoints(obj.Mesh))
elif Draft.getType(obj) == "Points":
# for points we only snap to points
snaps.extend(self.snapToEndpoints(obj.Points))
# updating last objects list
if not self.lastObj[1]:
self.lastObj[1] = obj.Name
elif self.lastObj[1] != obj.Name:
self.lastObj[0] = self.lastObj[1]
self.lastObj[1] = obj.Name
if not snaps:
return cstr(point)
# calculating the nearest snap point
shortest = 1000000000000000000
origin = Vector(self.snapInfo['x'],self.snapInfo['y'],self.snapInfo['z'])
winner = None
fp = point
for snap in snaps:
if (not snap) or (snap[0] == None):
pass
#print("debug: Snapper: invalid snap point: ",snaps)
else:
delta = snap[0].sub(origin)
if delta.Length < shortest:
shortest = delta.Length
winner = snap
if winner:
# see if we are out of the max radius, if any
if self.radius:
dv = point.sub(winner[2])
if (dv.Length > self.radius):
if (not oldActive) and self.isEnabled("passive"):
winner = self.snapToVertex(self.snapInfo)
# setting the cursors
if self.tracker and not self.selectMode:
self.tracker.setCoords(winner[2])
self.tracker.setMarker(self.mk[winner[1]])
self.tracker.on()
# setting the trackline
fp = cstr(winner[2])
if self.trackLine and lastpoint:
self.trackLine.p2(fp)
self.trackLine.on()
# set the cursor
self.setCursor(winner[1])
# set the arch point tracking
if self.lastArchPoint:
self.setArchDims(self.lastArchPoint,fp)
if Draft.getType(obj) in ["Wall","Structure"]:
self.lastArchPoint = winner[2]
else:
self.lastArchPoint = None
# return the final point
return fp
def toWP(self,point):
"projects the given point on the working plane, if needed"
if self.isEnabled("WorkingPlane"):
if hasattr(FreeCAD,"DraftWorkingPlane"):
return FreeCAD.DraftWorkingPlane.projectPoint(point)
return point
def getApparentPoint(self,x,y):
"returns a 3D point, projected on the current working plane"
view = Draft.get3DView()
pt = view.getPoint(x,y)
if self.mask != "z":
if hasattr(FreeCAD,"DraftWorkingPlane"):
if view.getCameraType() == "Perspective":
camera = view.getCameraNode()
p = camera.getField("position").getValue()
dv = pt.sub(Vector(p[0],p[1],p[2]))
else:
dv = view.getViewDirection()
return FreeCAD.DraftWorkingPlane.projectPoint(pt,dv)
return pt
def snapToExtensions(self,point,last,constrain,eline):
"returns a point snapped to extension or parallel line to last object, if any"
if self.isEnabled("extension"):
tsnap = self.snapToExtOrtho(last,constrain,eline)
if tsnap:
if (tsnap[0].sub(point)).Length < self.radius:
if self.tracker and not self.selectMode:
self.tracker.setCoords(tsnap[2])
self.tracker.setMarker(self.mk[tsnap[1]])
self.tracker.on()
if self.extLine:
self.extLine.p2(tsnap[2])
self.extLine.on()
self.setCursor(tsnap[1])
return tsnap[2],eline
else:
tsnap = self.snapToExtPerpendicular(last)
if tsnap:
if (tsnap[0].sub(point)).Length < self.radius:
if self.tracker and not self.selectMode:
self.tracker.setCoords(tsnap[2])
self.tracker.setMarker(self.mk[tsnap[1]])
self.tracker.on()
if self.extLine:
self.extLine.p2(tsnap[2])
self.extLine.on()
self.setCursor(tsnap[1])
return tsnap[2],eline
for o in [self.lastObj[1],self.lastObj[0]]:
if o:
ob = FreeCAD.ActiveDocument.getObject(o)
if ob:
if ob.isDerivedFrom("Part::Feature"):
edges = ob.Shape.Edges
if Draft.getType(ob) == "Wall":
for so in [ob]+ob.Additions:
if Draft.getType(so) == "Wall":
if so.Base:
edges.extend(so.Base.Shape.Edges)
edges.reverse()
if (not self.maxEdges) or (len(edges) <= self.maxEdges):
for e in edges:
if DraftGeomUtils.geomType(e) == "Line":
np = self.getPerpendicular(e,point)
if not DraftGeomUtils.isPtOnEdge(np,e):
if (np.sub(point)).Length < self.radius:
if self.isEnabled('extension'):
if np != e.Vertexes[0].Point:
p0 = e.Vertexes[0].Point
if self.tracker and not self.selectMode:
self.tracker.setCoords(np)
self.tracker.setMarker(self.mk['extension'])
self.tracker.on()
if self.extLine:
if self.snapStyle:
dv = np.sub(p0)
self.extLine.p1(p0.add(dv.multiply(0.5)))
else:
self.extLine.p1(p0)
self.extLine.p2(np)
self.extLine.on()
self.setCursor('extension')
ne = Part.Line(p0,np).toShape()
# storing extension line for intersection calculations later
if len(self.lastExtensions) == 0:
self.lastExtensions.append(ne)
elif len(self.lastExtensions) == 1:
if not DraftGeomUtils.areColinear(ne,self.lastExtensions[0]):
self.lastExtensions.append(self.lastExtensions[0])
self.lastExtensions[0] = ne
else:
if (not DraftGeomUtils.areColinear(ne,self.lastExtensions[0])) and \
(not DraftGeomUtils.areColinear(ne,self.lastExtensions[1])):
self.lastExtensions[1] = self.lastExtensions[0]
self.lastExtensions[0] = ne
return np,ne
else:
if self.isEnabled('parallel'):
if last:
ve = DraftGeomUtils.vec(e)
if not DraftVecUtils.isNull(ve):
de = Part.Line(last,last.add(ve)).toShape()
np = self.getPerpendicular(de,point)
if (np.sub(point)).Length < self.radius:
if self.tracker and not self.selectMode:
self.tracker.setCoords(np)
self.tracker.setMarker(self.mk['parallel'])
self.tracker.on()
self.setCursor('parallel')
return np,de
return point,eline
def snapToCrossExtensions(self,point):
"snaps to the intersection of the last 2 extension lines"
if self.isEnabled('extension'):
if len(self.lastExtensions) == 2:
np = DraftGeomUtils.findIntersection(self.lastExtensions[0],self.lastExtensions[1],True,True)
if np:
for p in np:
dv = point.sub(p)
if (self.radius == 0) or (dv.Length <= self.radius):
if self.tracker and not self.selectMode:
self.tracker.setCoords(p)
self.tracker.setMarker(self.mk['intersection'])
self.tracker.on()
self.setCursor('intersection')
if self.extLine and self.extLine2:
if DraftVecUtils.equals(self.extLine.p1(),self.lastExtensions[0].Vertexes[0].Point):
p0 = self.lastExtensions[1].Vertexes[0].Point
else:
p0 = self.lastExtensions[0].Vertexes[0].Point
if self.snapStyle:
dv = p.sub(p0)
self.extLine2.p1(p0.add(dv.multiply(0.5)))
else:
self.extLine2.p1(p0)
self.extLine2.p2(p)
self.extLine.p2(p)
self.extLine2.on()
return p
return None
def snapToPolar(self,point,last):
"snaps to polar lines from the given point"
if self.isEnabled('ortho') and (not self.mask):
if last:
vecs = []
if hasattr(FreeCAD,"DraftWorkingPlane"):
ax = [FreeCAD.DraftWorkingPlane.u,
FreeCAD.DraftWorkingPlane.v,
FreeCAD.DraftWorkingPlane.axis]
else:
ax = [FreeCAD.Vector(1,0,0),
FreeCAD.Vector(0,1,0),
FreeCAD.Vector(0,0,1)]
for a in self.polarAngles:
if a == 90:
vecs.extend([ax[0],ax[0].negative()])
vecs.extend([ax[1],ax[1].negative()])
else:
v = DraftVecUtils.rotate(ax[0],math.radians(a),ax[2])
vecs.extend([v,v.negative()])
v = DraftVecUtils.rotate(ax[1],math.radians(a),ax[2])
vecs.extend([v,v.negative()])
for v in vecs:
if not DraftVecUtils.isNull(v):
try:
de = Part.Line(last,last.add(v)).toShape()
except Part.OCCError:
return point,None
np = self.getPerpendicular(de,point)
if ((self.radius == 0) and (point.sub(last).getAngle(v) < 0.087)) \
or ((np.sub(point)).Length < self.radius):
if self.tracker and not self.selectMode:
self.tracker.setCoords(np)
self.tracker.setMarker(self.mk['parallel'])
self.tracker.on()
self.setCursor('ortho')
return np,de
return point,None
def snapToGrid(self,point):
"returns a grid snap point if available"
if self.grid:
if self.grid.Visible:
if self.isEnabled("grid"):
np = self.grid.getClosestNode(point)
if np:
dv = point.sub(np)
if (self.radius == 0) or (dv.Length <= self.radius):
if self.tracker and not self.selectMode:
self.tracker.setCoords(np)
self.tracker.setMarker(self.mk['grid'])
self.tracker.on()
self.setCursor('grid')
return np
return point
def snapToEndpoints(self,shape):
"returns a list of enpoints snap locations"
snaps = []
if self.isEnabled("endpoint"):
if hasattr(shape,"Vertexes"):
for v in shape.Vertexes:
snaps.append([v.Point,'endpoint',self.toWP(v.Point)])
elif hasattr(shape,"Point"):
snaps.append([shape.Point,'endpoint',self.toWP(shape.Point)])
elif hasattr(shape,"Points"):
if len(shape.Points) and hasattr(shape.Points[0],"Vector"):
for v in shape.Points:
snaps.append([v.Vector,'endpoint',self.toWP(v.Vector)])
else:
for v in shape.Points:
snaps.append([v,'endpoint',self.toWP(v)])
return snaps
def snapToMidpoint(self,shape):
"returns a list of midpoints snap locations"
snaps = []
if self.isEnabled("midpoint"):
if isinstance(shape,Part.Edge):
mp = DraftGeomUtils.findMidpoint(shape)
if mp:
snaps.append([mp,'midpoint',self.toWP(mp)])
return snaps
def snapToPerpendicular(self,shape,last):
"returns a list of perpendicular snap locations"
snaps = []
if self.isEnabled("perpendicular"):
if last:
if isinstance(shape,Part.Edge):
if DraftGeomUtils.geomType(shape) == "Line":
np = self.getPerpendicular(shape,last)
elif DraftGeomUtils.geomType(shape) == "Circle":
dv = last.sub(shape.Curve.Center)
dv = DraftVecUtils.scaleTo(dv,shape.Curve.Radius)
np = (shape.Curve.Center).add(dv)
elif DraftGeomUtils.geomType(shape) == "BSplineCurve":
try:
pr = shape.Curve.parameter(last)
np = shape.Curve.value(pr)
except:
return snaps
else:
return snaps
snaps.append([np,'perpendicular',self.toWP(np)])
return snaps
def snapToOrtho(self,shape,last,constrain):
"returns a list of ortho snap locations"
snaps = []
if self.isEnabled("ortho"):
if constrain:
if isinstance(shape,Part.Edge):
if last:
if DraftGeomUtils.geomType(shape) == "Line":
if self.constraintAxis:
tmpEdge = Part.Line(last,last.add(self.constraintAxis)).toShape()
# get the intersection points
pt = DraftGeomUtils.findIntersection(tmpEdge,shape,True,True)
if pt:
for p in pt:
snaps.append([p,'ortho',self.toWP(p)])
return snaps
def snapToExtOrtho(self,last,constrain,eline):
"returns an ortho X extension snap location"
if self.isEnabled("extension") and self.isEnabled("ortho"):
if constrain and last and self.constraintAxis and self.extLine:
tmpEdge1 = Part.Line(last,last.add(self.constraintAxis)).toShape()
tmpEdge2 = Part.Line(self.extLine.p1(),self.extLine.p2()).toShape()
# get the intersection points
pt = DraftGeomUtils.findIntersection(tmpEdge1,tmpEdge2,True,True)
if pt:
return [pt[0],'ortho',pt[0]]
if eline:
try:
tmpEdge2 = Part.Line(self.extLine.p1(),self.extLine.p2()).toShape()
# get the intersection points
pt = DraftGeomUtils.findIntersection(eline,tmpEdge2,True,True)
if pt:
return [pt[0],'ortho',pt[0]]
except:
return None
return None
def snapToExtPerpendicular(self,last):
"returns a perpendicular X extension snap location"
if self.isEnabled("extension") and self.isEnabled("perpendicular"):
if last and self.extLine:
if self.extLine.p1() != self.extLine.p2():
tmpEdge = Part.Line(self.extLine.p1(),self.extLine.p2()).toShape()
np = self.getPerpendicular(tmpEdge,last)
return [np,'perpendicular',np]
return None
def snapToElines(self,e1,e2):
"returns a snap location at the infinite intersection of the given edges"
snaps = []
if self.isEnabled("intersection") and self.isEnabled("extension"):
if e1 and e2:
# get the intersection points
pts = DraftGeomUtils.findIntersection(e1,e2,True,True)
if pts:
for p in pts:
snaps.append([p,'intersection',self.toWP(p)])
return snaps
def snapToAngles(self,shape):
"returns a list of angle snap locations"
snaps = []
if self.isEnabled("angle"):
rad = shape.Curve.Radius
pos = shape.Curve.Center
for i in [0,30,45,60,90,120,135,150,180,210,225,240,270,300,315,330]:
ang = math.radians(i)
cur = Vector(math.sin(ang)*rad+pos.x,math.cos(ang)*rad+pos.y,pos.z)
snaps.append([cur,'angle',self.toWP(cur)])
return snaps
def snapToCenter(self,shape):
"returns a list of center snap locations"
snaps = []
if self.isEnabled("center"):
pos = shape.Curve.Center
c = self.toWP(pos)
if hasattr(shape.Curve,"Radius"):
rad = shape.Curve.Radius
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]:
ang = math.radians(i)
cur = Vector(math.sin(ang)*rad+pos.x,math.cos(ang)*rad+pos.y,pos.z)
snaps.append([cur,'center',c])
else:
snaps.append([c,'center',c])
return snaps
def snapToIntersection(self,shape):
"returns a list of intersection snap locations"
snaps = []
if self.isEnabled("intersection"):
# get the stored objects to calculate intersections
if self.lastObj[0]:
obj = FreeCAD.ActiveDocument.getObject(self.lastObj[0])
if obj:
if obj.isDerivedFrom("Part::Feature"):
if (not self.maxEdges) or (len(obj.Shape.Edges) <= self.maxEdges):
for e in obj.Shape.Edges:
# get the intersection points
pt = DraftGeomUtils.findIntersection(e,shape)
if pt:
for p in pt:
snaps.append([p,'intersection',self.toWP(p)])
return snaps
def snapToPolygon(self,obj):
"returns a list of polygon center snap locations"
snaps = []
if self.isEnabled("center"):
c = obj.Placement.Base
for edge in obj.Shape.Edges:
p1 = edge.Vertexes[0].Point
p2 = edge.Vertexes[-1].Point
v1 = p1.add((p2-p1).scale(.25,.25,.25))
v2 = p1.add((p2-p1).scale(.75,.75,.75))
snaps.append([v1,'center',self.toWP(c)])
snaps.append([v2,'center',self.toWP(c)])
return snaps
def snapToVertex(self,info,active=False):
p = Vector(info['x'],info['y'],info['z'])
if active:
if self.isEnabled("passive"):
return [p,'endpoint',p]
else:
return []
elif self.isEnabled("passive"):
return [p,'passive',p]
else:
return []
def getScreenDist(self,dist,cursor):
"returns a distance in 3D space from a screen pixels distance"
view = Draft.get3DView()
p1 = view.getPoint(cursor)
p2 = view.getPoint((cursor[0]+dist,cursor[1]))
return (p2.sub(p1)).Length
def getPerpendicular(self,edge,pt):
"returns a point on an edge, perpendicular to the given point"
dv = pt.sub(edge.Vertexes[0].Point)
nv = DraftVecUtils.project(dv,DraftGeomUtils.vec(edge))
np = (edge.Vertexes[0].Point).add(nv)
return np
def setArchDims(self,p1,p2):
"show arch dimensions between 2 points"
if self.isEnabled("Dimensions"):
if not self.dim1:
self.dim1 = DraftTrackers.archDimTracker(mode=2)
if not self.dim2:
self.dim1 = DraftTrackers.archDimTracker(mode=3)
self.dim1.p1(p1)
self.dim2.p1(p1)
self.dim1.p2(p2)
self.dim2.p2(p2)
if self.dim1.Distance:
self.dim1.on()
if self.dim2.Distance:
self.dim2.on()
def setCursor(self,mode=None):
"setCursor(self,mode=None): sets or resets the cursor to the given mode or resets"
if self.selectMode:
mw = FreeCADGui.getMainWindow()
for w in mw.findChild(QtGui.QMdiArea).findChildren(QtGui.QWidget):
if w.metaObject().className() == "SIM::Coin3D::Quarter::QuarterWidget":
w.unsetCursor()
self.cursorMode = None
elif not mode:
mw = FreeCADGui.getMainWindow()
for w in mw.findChild(QtGui.QMdiArea).findChildren(QtGui.QWidget):
if w.metaObject().className() == "SIM::Coin3D::Quarter::QuarterWidget":
w.unsetCursor()
self.cursorMode = None
else:
if mode != self.cursorMode:
baseicon = QtGui.QPixmap(":/icons/Draft_Cursor.svg")
newicon = QtGui.QPixmap(32,24)
newicon.fill(QtCore.Qt.transparent)
qp = QtGui.QPainter()
qp.begin(newicon)
qp.drawPixmap(0,0,baseicon)
if not (mode == 'passive'):
tp = QtGui.QPixmap(self.cursors[mode]).scaledToWidth(16)
qp.drawPixmap(QtCore.QPoint(16, 8), tp);
qp.end()
cur = QtGui.QCursor(newicon,8,8)
mw = FreeCADGui.getMainWindow()
for w in mw.findChild(QtGui.QMdiArea).findChildren(QtGui.QWidget):
if w.metaObject().className() == "SIM::Coin3D::Quarter::QuarterWidget":
w.setCursor(cur)
self.cursorMode = mode
def restack(self):
if self.grid:
self.grid.lowerTracker()
def off(self):
"finishes snapping"
if self.tracker:
self.tracker.off()
if self.trackLine:
self.trackLine.off()
if self.extLine:
self.extLine.off()
if self.extLine2:
self.extLine2.off()
if self.radiusTracker:
self.radiusTracker.off()
if self.dim1:
self.dim1.off()
if self.dim2:
self.dim2.off()
if self.grid:
if not Draft.getParam("alwaysShowGrid",True):
self.grid.off()
self.unconstrain()
self.radius = 0
self.setCursor()
if Draft.getParam("hideSnapBar",False):
self.toolbar.hide()
self.mask = None
self.lastArchPoint = None
self.selectMode = False
def setSelectMode(self,mode):
"sets the snapper into select mode (hides snapping temporarily)"
self.selectMode = mode
if not mode:
self.setCursor()
else:
if self.trackLine:
self.trackLine.off()
def setAngle(self,delta=None):
"keeps the current angle"
if delta:
self.mask = delta
elif isinstance(self.mask,FreeCAD.Vector):
self.mask = None
elif self.trackLine:
if self.trackLine.Visible:
self.mask = self.trackLine.p2().sub(self.trackLine.p1())
def constrain(self,point,basepoint=None,axis=None):
'''constrain(point,basepoint=None,axis=None: Returns a
constrained point. Axis can be "x","y" or "z" or a custom vector. If None,
the closest working plane axis will be picked.
Basepoint is the base point used to figure out from where the point
must be constrained. If no basepoint is given, the current point is
used as basepoint.'''
# without the Draft module fully loaded, no axes system!"
if not hasattr(FreeCAD,"DraftWorkingPlane"):
return point
point = Vector(point)
# setup trackers if needed
if not self.constrainLine:
if self.snapStyle:
self.constrainLine = DraftTrackers.lineTracker(scolor=FreeCADGui.draftToolBar.getDefaultColor("snap"))
else:
self.constrainLine = DraftTrackers.lineTracker(dotted=True)
# setting basepoint
if not basepoint:
if not self.basepoint:
self.basepoint = point
else:
self.basepoint = basepoint
delta = point.sub(self.basepoint)
# setting constraint axis
if self.mask:
self.affinity = self.mask
if not self.affinity:
self.affinity = FreeCAD.DraftWorkingPlane.getClosestAxis(delta)
if isinstance(axis,FreeCAD.Vector):
self.constraintAxis = axis
elif axis == "x":
self.constraintAxis = FreeCAD.DraftWorkingPlane.u
elif axis == "y":
self.constraintAxis = FreeCAD.DraftWorkingPlane.v
elif axis == "z":
self.constraintAxis = FreeCAD.DraftWorkingPlane.axis
else:
if self.affinity == "x":
self.constraintAxis = FreeCAD.DraftWorkingPlane.u
elif self.affinity == "y":
self.constraintAxis = FreeCAD.DraftWorkingPlane.v
elif self.affinity == "z":
self.constraintAxis = FreeCAD.DraftWorkingPlane.axis
elif isinstance(self.affinity,FreeCAD.Vector):
self.constraintAxis = self.affinity
else:
self.constraintAxis = None
if not self.constraintAxis:
return point
# calculating constrained point
cdelta = DraftVecUtils.project(delta,self.constraintAxis)
npoint = self.basepoint.add(cdelta)
# setting constrain line
if self.constrainLine:
if point != npoint:
self.constrainLine.p1(point)
self.constrainLine.p2(npoint)
self.constrainLine.on()
else:
self.constrainLine.off()
return npoint
def unconstrain(self):
self.basepoint = None
self.affinity = None
if self.constrainLine:
self.constrainLine.off()
def getPoint(self,last=None,callback=None,movecallback=None,extradlg=None):
"""
getPoint([last],[callback],[movecallback],[extradlg]) : gets a 3D point
from the screen. You can provide an existing point, in that case additional
snap options and a tracker are available.
You can also pass a function as callback, which will get called
with the resulting point as argument, when a point is clicked, and optionally
another callback which gets called when the mouse is moved.
If the operation gets cancelled (the user pressed Escape), no point is returned.