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gui_snapper.py
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gui_snapper.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 *
# * *
# ***************************************************************************
"""Provides the Snapper class to define the snapping tools and modes.
This module provides tools to handle point snapping and
everything that goes with it (toolbar buttons, cursor icons, etc.).
It also creates the Draft grid, which is actually a tracker
defined by `gui_trackers.gridTracker`.
"""
## @package gui_snapper
# \ingroup draftguitools
# \brief Provides the Snapper class to define the snapping tools and modes.
#
# This module provides tools to handle point snapping and
# everything that goes with it (toolbar buttons, cursor icons, etc.).
## \addtogroup draftguitools
# @{
import collections as coll
import inspect
import itertools
import math
import pivy.coin as coin
import PySide.QtCore as QtCore
import PySide.QtGui as QtGui
import FreeCAD as App
import FreeCADGui as Gui
import Part
import Draft
import DraftVecUtils
import DraftGeomUtils
import draftguitools.gui_trackers as trackers
from draftutils.init_tools import get_draft_snap_commands
from draftutils.messages import _msg, _wrn
__title__ = "FreeCAD Draft Snap tools"
__author__ = "Yorik van Havre"
__url__ = "https://www.freecadweb.org"
UNSNAPPABLES = ('Image::ImagePlane',)
class Snapper:
"""Classes to manage snapping in Draft and Arch.
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 individual 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 Gui once the Draft module has been
loaded.
"""
def __init__(self):
self.activeview = None
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.active = True
self.forceGridOff = False
self.lastExtensions = []
# the trackers are stored in lists because there can be several views,
# each with its own set
# view, grid, snap, extline, radius, dim1, dim2, trackLine,
# extline2, crosstrackers
self.trackers = [[], [], [], [], [], [], [], [], [], []]
self.polarAngles = [90, 45]
self.selectMode = False
self.holdTracker = None
self.holdPoints = []
self.running = False
self.callbackClick = None
self.callbackMove = None
self.snapObjectIndex = 0
# snap keys, it's important that they are in this order for
# saving in preferences and for properly restoring the toolbar
self.snaps = ['Lock', # 0
'Near', # 1 former "passive" snap
'Extension', # 2
'Parallel', # 3
'Grid', # 4
"Endpoint", # 5
'Midpoint', # 6
'Perpendicular', # 7
'Angle', # 8
'Center', # 9
'Ortho', # 10
'Intersection', # 11
'Special', # 12
'Dimensions', # 13
'WorkingPlane' # 14
]
self.init_active_snaps()
# the snapmarker has "dot","circle" and "square" available styles
if self.snapStyle:
self.mk = coll.OrderedDict([('passive', 'empty'),
('extension', 'empty'),
('parallel', 'empty'),
('grid', 'quad'),
('endpoint', 'quad'),
('midpoint', 'quad'),
('perpendicular', 'quad'),
('angle', 'quad'),
('center', 'quad'),
('ortho', 'quad'),
('intersection', 'quad'),
('special', 'quad')])
else:
self.mk = coll.OrderedDict([('passive', 'circle'),
('extension', 'circle'),
('parallel', 'circle'),
('grid', 'circle'),
('endpoint', 'dot'),
('midpoint', 'square'),
('perpendicular', 'dot'),
('angle', 'square'),
('center', 'dot'),
('ortho', 'dot'),
('intersection', 'dot'),
('special', 'dot')])
self.cursors = \
coll.OrderedDict([('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'),
('special', ':/icons/Snap_Special.svg')])
def init_active_snaps(self):
"""
set self.active_snaps according to user prefs
"""
self.active_snaps = []
param = App.ParamGet("User parameter:BaseApp/Preferences/Mod/Draft")
snap_modes = param.GetString("snapModes", "100000000000000") # default value: only lock is ON
i = 0
for snap in snap_modes:
if bool(int(snap)):
self.active_snaps.append(self.snaps[i])
i += 1
def cstr(self, lastpoint, constrain, point):
"""Return constraints 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
def snap(self, screenpos,
lastpoint=None, active=True,
constrain=False, noTracker=False):
"""Return a snapped point from the given (x, y) screen position.
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.
"""
if self.running:
# do not allow concurrent runs
return None
self.running = True
global Part, DraftGeomUtils
import Part, DraftGeomUtils
self.spoint = None
if not hasattr(self, "toolbar"):
self.makeSnapToolBar()
mw = Gui.getMainWindow()
bt = mw.findChild(QtGui.QToolBar,"Draft Snap")
if not bt:
mw.addToolBar(self.toolbar)
else:
if Draft.getParam("showSnapBar", True):
bt.show()
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):
_wrn("Snap needs valid screen position (list, tuple or sbvec2s)")
self.running = False
return None
# Setup trackers if needed
self.setTrackers()
# Get current snap radius
self.radius = self.getScreenDist(Draft.getParam("snapRange", 8),
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.extLine2:
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])
# Set up a track line if we got a last point
if lastpoint and self.trackLine:
self.trackLine.p1(lastpoint)
# Check if parallel to one of the edges of the last objects
# or to a polar direction
eline = None
if active:
point, eline = self.snapToPolar(point, lastpoint)
point, eline = self.snapToExtensions(point, lastpoint,
constrain, eline)
# Check if we have an object under the cursor and try to
# snap to it
_view = Draft.get3DView()
objectsUnderCursor = _view.getObjectsInfo((screenpos[0], screenpos[1]))
if objectsUnderCursor:
if self.snapObjectIndex >= len(objectsUnderCursor):
self.snapObjectIndex = 0
self.snapInfo = objectsUnderCursor[self.snapObjectIndex]
if self.snapInfo and "Component" in self.snapInfo:
osnap = self.snapToObject(lastpoint, active, constrain,
eline, point, oldActive)
if osnap:
return osnap
# 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 = self.cstr(lastpoint, constrain, point)
if self.trackLine and lastpoint and (not noTracker):
self.trackLine.p2(fp)
self.trackLine.color.rgb = Gui.draftToolBar.getDefaultColor("line")
self.trackLine.on()
# Set the arch point tracking
if lastpoint:
self.setArchDims(lastpoint, fp)
self.spoint = fp
self.running = False
return fp
def cycleSnapObject(self):
"""Increase the index of the snap object by one."""
self.snapObjectIndex = self.snapObjectIndex + 1
def snapToObject(self, lastpoint, active, constrain,
eline, point, oldActive):
"""Snap to an object."""
parent = self.snapInfo.get('ParentObject', None)
if parent:
subname = self.snapInfo['SubName']
obj = parent.getSubObject(subname, retType=1)
else:
obj = App.ActiveDocument.getObject(self.snapInfo['Object'])
parent = obj
subname = self.snapInfo['Component']
if not obj:
self.spoint = self.cstr(point)
self.running = False
return self.spoint
snaps = []
self.lastSnappedObject = obj
if obj and (Draft.getType(obj) in UNSNAPPABLES):
return []
if hasattr(obj.ViewObject, "Selectable"):
if not obj.ViewObject.Selectable:
self.spoint = self.cstr(lastpoint, constrain, point)
self.running = False
return self.spoint
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']
shape = Part.getShape(parent, subname,
needSubElement=True,
noElementMap=True)
if not shape.isNull():
snaps.extend(self.snapToSpecials(obj, lastpoint, eline))
if Draft.getType(obj) == "Polygon":
# Special snapping for polygons: add the center
snaps.extend(self.snapToPolygon(obj))
elif (Draft.getType(obj) == "BuildingPart"
and self.isEnabled("Center")):
# snap to the base placement of empty BuildingParts
snaps.append([obj.Placement.Base, 'center',
self.toWP(obj.Placement.Base)])
if (not self.maxEdges) or (len(shape.Edges) <= self.maxEdges):
if "Edge" in comp:
# we are snapping to an edge
if shape.ShapeType == "Edge":
edge = shape
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))
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 "Face" in comp:
# we are snapping to a face
if shape.ShapeType == "Face":
face = shape
snaps.extend(self.snapToFace(face))
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
snaps = [self.snapToVertex(self.snapInfo)]
elif Draft.getType(obj) == "Dimension":
# for dimensions we snap to their 2 points:
snaps.extend(self.snapToDim(obj))
elif Draft.getType(obj) == "Axis":
for edge in obj.Shape.Edges:
snaps.extend(self.snapToEndpoints(edge))
snaps.extend(self.snapToIntersection(edge))
elif Draft.getType(obj).startswith("Mesh::"):
# for meshes we only snap to vertices
snaps.extend(self.snapToEndpoints(obj.Mesh))
elif Draft.getType(obj).startswith("Points::"):
# for points we only snap to points
snaps.extend(self.snapToEndpoints(obj.Points))
elif (Draft.getType(obj) in ("WorkingPlaneProxy", "BuildingPart")
and self.isEnabled("Center")):
# snap to the center of WPProxies or to the base
# placement of no empty BuildingParts
snaps.append([obj.Placement.Base, 'center',
self.toWP(obj.Placement.Base)])
elif Draft.getType(obj) == "SectionPlane":
# snap to corners of section planes
snaps.extend(self.snapToEndpoints(obj.Shape))
if not snaps:
return None
# 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
# calculating the nearest snap point
shortest = 1000000000000000000
origin = App.Vector(self.snapInfo['x'],
self.snapInfo['y'],
self.snapInfo['z'])
winner = None
fp = point
for snap in snaps:
if (not snap) or (snap[0] is 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("Near"):
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 = self.cstr(lastpoint, constrain, winner[2])
if self.trackLine and lastpoint:
self.trackLine.p2(fp)
self.trackLine.color.rgb = Gui.draftToolBar.getDefaultColor("line")
self.trackLine.on()
# set the cursor
self.setCursor(winner[1])
# set the arch point tracking
if lastpoint:
self.setArchDims(lastpoint, fp)
# return the final point
self.spoint = fp
self.running = False
return self.spoint
def toWP(self, point):
"""Project the given point on the working plane, if needed."""
if self.isEnabled("WorkingPlane"):
if hasattr(App, "DraftWorkingPlane"):
return App.DraftWorkingPlane.projectPoint(point)
return point
def getApparentPoint(self, x, y):
"""Return a 3D point, projected on the current working plane."""
view = Draft.get3DView()
pt = view.getPoint(x, y)
if self.mask != "z":
if hasattr(App,"DraftWorkingPlane"):
if view.getCameraType() == "Perspective":
camera = view.getCameraNode()
p = camera.getField("position").getValue()
dv = pt.sub(App.Vector(p[0], p[1], p[2]))
else:
dv = view.getViewDirection()
return App.DraftWorkingPlane.projectPoint(pt, dv)
return pt
def snapToDim(self, obj):
snaps = []
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)])
return snaps
def snapToExtensions(self, point, last, constrain, eline):
"""Return a point snapped to extension or parallel line.
The parallel line of the last object, if any.
"""
tsnap = self.snapToHold(point)
if tsnap:
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.p1(tsnap[0])
self.extLine.p2(tsnap[2])
self.extLine.color.rgb = Gui.draftToolBar.getDefaultColor("line")
self.extLine.on()
self.setCursor(tsnap[1])
return tsnap[2], eline
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.color.rgb = Gui.draftToolBar.getDefaultColor("line")
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.color.rgb = Gui.draftToolBar.getDefaultColor("line")
self.extLine.on()
self.setCursor(tsnap[1])
return tsnap[2], eline
for o in (self.lastObj[1], self.lastObj[0]):
if o and (self.isEnabled('Extension')
or self.isEnabled('Parallel')):
ob = App.ActiveDocument.getObject(o)
if not ob:
continue
if not ob.isDerivedFrom("Part::Feature"):
continue
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":
continue
np = self.getPerpendicular(e,point)
if DraftGeomUtils.isPtOnEdge(np,e):
continue
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.color.rgb = Gui.draftToolBar.getDefaultColor("line")
self.extLine.on()
self.setCursor('extension')
ne = Part.LineSegment(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.LineSegment(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):
"""Snap 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.extLine.color.rgb = Gui.draftToolBar.getDefaultColor("line")
self.extLine2.on()
return p
return None
def snapToPolar(self,point,last):
"""Snap to polar lines from the given point."""
if self.isEnabled('Ortho') and (not self.mask):
if last:
vecs = []
if hasattr(App,"DraftWorkingPlane"):
ax = [App.DraftWorkingPlane.u,
App.DraftWorkingPlane.v,
App.DraftWorkingPlane.axis]
else:
ax = [App.Vector(1, 0, 0),
App.Vector(0, 1, 0),
App.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.LineSegment(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):
"""Return 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):
"""Return a list of endpoints 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):
"""Return 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):
"""Return 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 Exception:
return snaps
else:
return snaps
snaps.append([np, 'perpendicular', self.toWP(np)])
return snaps
def snapToOrtho(self, shape, last, constrain):
"""Return 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.LineSegment(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):
"""Return 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.LineSegment(last, last.add(self.constraintAxis)).toShape()
tmpEdge2 = Part.LineSegment(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.LineSegment(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 Exception:
return None
return None
def snapToHold(self, point):
"""Return a snap location that is orthogonal to hold points.
Or if possible at crossings.
"""
if not self.holdPoints:
return None
if hasattr(App, "DraftWorkingPlane"):
u = App.DraftWorkingPlane.u
v = App.DraftWorkingPlane.v
else:
u = App.Vector(1, 0, 0)
v = App.Vector(0, 1, 0)
if len(self.holdPoints) > 1:
# first try mid points
if self.isEnabled("Midpoint"):
l = list(self.holdPoints)
for p1, p2 in itertools.combinations(l, 2):
p3 = p1.add((p2.sub(p1)).multiply(0.5))
if (p3.sub(point)).Length < self.radius:
return [p1, 'midpoint', p3]
# then try int points
ipoints = []
l = list(self.holdPoints)
while len(l) > 1:
p1 = l.pop()
for p2 in l:
i1 = DraftGeomUtils.findIntersection(p1, p1.add(u), p2, p2.add(v), True, True)
if i1:
ipoints.append([p1, i1[0]])
i2 = DraftGeomUtils.findIntersection(p1, p1.add(v), p2, p2.add(u), True, True)
if i2:
ipoints.append([p1, i2[0]])
for p in ipoints:
if (p[1].sub(point)).Length < self.radius:
return [p[0], 'ortho', p[1]]
# then try to stick to a line
for p in self.holdPoints:
d = DraftGeomUtils.findDistance(point, [p, p.add(u)])
if d:
if d.Length < self.radius:
fp = point.add(d)
return [p, 'extension', fp]
d = DraftGeomUtils.findDistance(point, [p, p.add(v)])
if d:
if d.Length < self.radius:
fp = point.add(d)
return [p, 'extension', fp]
return None
def snapToExtPerpendicular(self, last):
"""Return 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.LineSegment(self.extLine.p1(), self.extLine.p2()).toShape()
np = self.getPerpendicular(tmpEdge, last)
return [np, 'perpendicular', np]
return None
def snapToElines(self, e1, e2):
"""Return a snap 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):
"""Return 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 = App.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):
"""Return 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 = App.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 snapToFace(self, shape):
"""Return a face center snap location."""
snaps = []
if self.isEnabled("Center"):
pos = shape.CenterOfMass
c = self.toWP(pos)
snaps.append([pos, 'center', c])
return snaps
def snapToIntersection(self, shape):
"""Return a list of intersection snap locations."""
snaps = []
if self.isEnabled("Intersection"):
# get the stored objects to calculate intersections
if self.lastObj[0]:
obj = App.ActiveDocument.getObject(self.lastObj[0])
if obj: