#
# Copyright (c) 2002, 2003, 2004, 2005, 2006 Art Haas
#
# This file is part of PythonCAD.
#
# PythonCAD is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# PythonCAD 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with PythonCAD; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
#
# single point construction lines at an arbitrary angle
#
from __future__ import generators
import math
from PythonCAD.Generic import conobject
from PythonCAD.Generic import tolerance
from PythonCAD.Generic import util
from PythonCAD.Generic import point
from PythonCAD.Generic import quadtree
_dtr = math.pi/180.0
class ACLine(conobject.ConstructionObject):
"""A class for single point construction lines at a specified angle.
A ACLine object is derived from an Spcline,so it has
all that objects properties.
There is one additional attribute for an ACLine:
angle: A float value listing the angle at which this line rises or declines
The limits of the float value: -90.0 < value < 90.0. Any values outside
that range are adjusted to fall between those limits.
A ACLine has the following addtional methods:
{get/set}Angle(): Get/Set the angle of the ACLine.
mapCoords(): Test if a coordinate pair is within some distance to an ACLine.
inRegion(): Return whether or not a ACLine passes through a bounded region.
clone(): Return an identical copy of an ACLine.
"""
__messages = {
'moved' : True,
'keypoint_changed' : True,
'rotated' : True
}
def __init__(self, p, a, **kw):
"""Initialize an ACLine object.
ACLine(p, a)
p: A Point object the line passes through
a: The angle at which the line rises or declines
"""
_a = util.make_angle(a)
_p = p
if not isinstance(p, point.Point):
_p = point.Point(p)
super(ACLine, self).__init__(**kw)
self.__keypoint = _p
self.__angle = _a
_p.storeUser(self)
_p.connect('moved', self.__movePoint)
_p.connect('change_pending', self.__pointChangePending)
_p.connect('change_complete', self.__pointChangeComplete)
def __eq__(self, obj):
"""Compare one ACLine to another for equality.
"""
if not isinstance(obj, ACLine):
return False
if obj is self:
return True
_as = self.__angle
_ao = obj.getAngle()
_xs, _ys = self.getLocation().getCoords()
_xo, _yo = obj.getLocation().getCoords()
_val = False
if (self.isVertical() and
obj.isVertical() and
abs(_xs - _xo) < 1e-10):
_val = True
elif (self.isHorizontal() and
obj.isHorizontal() and
abs(_ys - _yo) < 1e-10):
_val = True
else:
if abs(_as - _ao) < 1e-10: # same angle
_ms = math.tan(_as * _dtr)
_bs = _ys - (_ms * _xs)
_y = (_ms * _xo) + _bs
if abs(_y - _yo) < 1e-10:
_val = True
return _val
def __ne__(self, obj):
"""Compare one ACLine to another for inequality.
"""
if not isinstance(obj, ACLine):
return False
if obj is self:
return False
_as = self.__angle
_ao = obj.getAngle()
_xs, _ys = self.getLocation().getCoords()
_xo, _yo = obj.getLocation().getCoords()
_val = True
if (self.isVertical() and
obj.isVertical() and
abs(_xs - _xo) < 1e-10):
_val = False
elif (self.isHorizontal() and
obj.isHorizontal() and
abs(_ys - _yo) < 1e-10):
_val = False
else:
if abs(_as - _ao) < 1e-10: # same angle
_ms = math.tan(_as * _dtr)
_bs = _ys - (_ms * _xs)
_y = (_ms * _xo) + _bs
if abs(_y - _yo) < 1e-10:
_val = False
return _val
def __str__(self):
_point = self.getLocation()
_angle = self.__angle
return "Angled construction line through %s at %g degrees" % (_point, _angle)
def finish(self):
self.__keypoint.disconnect(self)
self.__keypoint.freeUser(self)
self.__keypoint = self.__angle = None
super(ACLine, self).finish()
def getValues(self):
_data = super(ACLine, self).getValues()
_data.setValue('type', 'acline')
_data.setValue('keypoint', self.__keypoint.getID())
_data.setValue('angle', self.__angle)
return _data
def getAngle(self):
"""Return the angle of the ACLine.
getAngle()
"""
return self.__angle
def setAngle(self, angle):
"""
setAngle(angle)
The argument a should be a float representing the angle
of the ACLine in degrees.
"""
if self.isLocked():
raise RuntimeError, "Setting angle not allowed - object locked."
_a = util.make_angle(angle)
_oa = self.__angle
if abs(_a - _oa) > 1e-10:
self.startChange('rotated')
self.__angle = _a
self.endChange('rotated')
self.sendMessage('rotated', _oa)
_x, _y = self.__keypoint.getCoords()
self.sendMessage('moved', _x, _y, _oa)
self.modified()
angle = property(getAngle, setAngle, None, "Angle of inclination.")
def isVertical(self):
return abs(abs(self.__angle) - 90.0) < 1e-10
def isHorizontal(self):
return abs(self.__angle) < 1e-10
def getLocation(self):
return self.__keypoint
def setLocation(self, p):
if self.isLocked():
raise RuntimeError, "Setting keypoint not allowed - object locked."
if not isinstance(p, point.Point):
raise TypeError, "Unexpected type for point: " + `type(p)`
_kp = self.__keypoint
if p is not _kp:
_x, _y = _kp.getCoords()
_kp.disconnect(self)
_kp.freeUser(self)
self.startChange('keypoint_changed')
self.__keypoint = p
self.endChange('keypoint_changed')
self.sendMessage('keypoint_changed', _kp)
p.connect('moved', self.__movePoint)
p.connect('change_pending', self.__pointChangePending)
p.connect('change_complete', self.__pointChangeComplete)
p.storeUser(self)
_px, _py = p.getCoords()
if abs(_px - _x) > 1e-10 or abs(_py - _y) > 1e-10:
self.sendMessage('moved', _x, _y, self.getAngle())
self.modified()
def mapCoords(self, x, y, tol=tolerance.TOL):
"""Return the nearest Point on the ACLine to a coordinate pair.
mapCoords(x, y[, tol])
The function has two required arguments:
x: A Float value giving the x-coordinate
y: A Float value giving the y-coordinate
There is a single optional argument:
tol: A float value equal or greater than 0.0
This function is used to map a possibly near-by coordinate pair to
an actual Point on the ACLine. If the distance between the actual
Point and the coordinates used as an argument is less than the tolerance,
the actual Point is returned. Otherwise, this function returns None.
"""
_x = util.get_float(x)
_y = util.get_float(y)
_t = tolerance.toltest(tol)
_xs, _ys = self.getLocation().getCoords()
_angle = self.__angle
#
# the second point is 1 unit away - this simplifies things ...
#
if self.isHorizontal():
_x2 = _xs + 1.0
_y2 = _ys
elif self.isVertical():
_x2 = _xs
_y2 = _ys + 1.0
else:
_x2 = _xs + math.cos(_angle * _dtr)
_y2 = _ys + math.sin(_angle * _dtr)
_r = ((_x - _xs)*(_x2 - _xs) + (_y - _ys)*(_y2 - _ys))
_px = _xs + (_r * (_x2 - _xs))
_py = _ys + (_r * (_y2 - _ys))
if abs(_px - _x) < _t and abs(_py - _y) < _t:
return _px, _py
return None
def getProjection(self, x, y):
"""Find the projection point of some coordinates on the ACLine.
getProjection(x, y)
Arguments 'x' and 'y' should be float values.
"""
_x = util.get_float(x)
_y = util.get_float(y)
_x1, _y1 = self.getLocation().getCoords()
_angle = self.__angle
if self.isHorizontal():
_px = _x
_py = _y1
elif self.isVertical():
_px = _x1
_py = _y
else:
_rangle = _angle * _dtr
_dx = math.cos(_rangle)
_dy = math.sin(_rangle)
_sqlen = pow(_dx, 2) + pow(_dy, 2)
_rn = ((_x - _x1) * _dx) + ((_y - _y1) * _dy)
_r = _rn/_sqlen
_px = _x1 + (_r * _dx)
_py = _y1 + (_r * _dy)
return _px, _py
def inRegion(self, xmin, ymin, xmax, ymax, fully=False):
"""Return whether or not an ACLine passes through a region.
inRegion(xmin, ymin, xmax, ymax)
The first four arguments define the boundary. The method
will return True if the ACLine passes through the boundary.
Otherwise the function will return False.
"""
_xmin = util.get_float(xmin)
_ymin = util.get_float(ymin)
_xmax = util.get_float(xmax)
if _xmax < _xmin:
raise ValueError, "Illegal values: xmax < xmin"
_ymax = util.get_float(ymax)
if _ymax < _ymin:
raise ValueError, "Illegal values: ymax < ymin"
util.test_boolean(fully)
if fully:
return False
_x, _y = self.getLocation().getCoords()
_angle = self.__angle
_val = False
if _xmin < _x < _xmax and _ymin < _y < _ymax:
_val = True
elif self.isHorizontal() and _ymin < _y < _ymax:
_val = True
elif self.isVertical() and _xmin < _x < _xmax:
_val = True
else:
#
# the ACLine can be parameterized as
#
# x = u * (x2 - x1) + x1
# y = u * (y2 - y1) + y1
#
# for u = 0, x => x1, y => y1
# for u = 1, x => x2, y => y2
#
# if the ACLine passes through the region then there
# will be valid u occuring at the region boundary
#
_rangle = _angle * _dtr
_dx = math.cos(_rangle)
_dy = math.sin(_rangle)
#
# x = xmin
#
_u = (_xmin - _x)/_dx
_yt = (_u * _dy) + _y
if (_ymin - 1e-10) < _yt < (_ymax + 1e-10): # catch endpoints
_val = True
if not _val:
#
# x = xmax
#
_u = (_xmax - _x)/_dx
_yt = (_u * _dy) + _y
if (_ymin - 1e-10) < _yt < (_ymax + 1e-10): # catch endpoints
_val = True
if not _val:
#
# y = ymin
#
# if this fails there is no way the ACLine can be in
# region because it cannot pass through only one side
#
_u = (_ymin - _y)/_dy
_xt = (_u * _dx) + _x
if _xmin < _xt < _xmax:
_val = True
return _val
def move(self, dx, dy):
"""Move an ACLine
move(dx, dy)
The first argument gives the x-coordinate displacement,
and the second gives the y-coordinate displacement. Both
values should be floats.
"""
if self.isLocked() or self.__keypoint.isLocked():
raise RuntimeError, "Moving ACLine not allowed - object locked."
_dx = util.get_float(dx)
_dy = util.get_float(dy)
if abs(_dx) > 1e-10 or abs(_dy) > 1e-10:
_x, _y = self.__keypoint.getCoords()
self.ignore('moved')
try:
self.__keypoint.move(_dx, _dy)
finally:
self.receive('moved')
self.sendMessage('moved', _x, _y, self.getAngle())
def __pointChangePending(self, p, *args):
_alen = len(args)
if _alen < 1:
raise ValueError, "Invalid argument count: %d" % _alen
if args[0] == 'moved':
self.startChange('moved')
def __pointChangeComplete(self, p, *args):
_alen = len(args)
if _alen < 1:
raise ValueError, "Invalid argument count: %d" % _alen
if args[0] == 'moved':
self.endChange('moved')
def __movePoint(self, p, *args):
_plen = len(args)
if _plen < 2:
raise ValueError, "Invalid argument count: %d" % _plen
_x = util.get_float(args[0])
_y = util.get_float(args[1])
if p is not self.__keypoint:
raise ValueError, "Invalid point for ACLine::movePoint()" + `p`
_px, _py = p.getCoords()
if abs(_px - _x) > 1e-10 or abs(_py - _y) > 1e-10:
self.sendMessage('moved', _x, _y, self.getAngle())
def clipToRegion(self, xmin, ymin, xmax, ymax):
_xmin = util.get_float(xmin)
_ymin = util.get_float(ymin)
_xmax = util.get_float(xmax)
if _xmax < _xmin:
raise ValueError, "Illegal values: xmax < xmin"
_ymax = util.get_float(ymax)
if _ymax < _ymin:
raise ValueError, "Illegal values: ymax < ymin"
_x, _y = self.getLocation().getCoords()
_angle = self.__angle
_coords = None
if self.isVertical() and _xmin < _x < _xmax:
_coords = (_x, _ymin, _x, _ymax)
elif self.isHorizontal() and _ymin < _y < _ymax:
_coords = (_xmin, _y, _xmax, _y)
else:
#
# the ACLine can be parameterized as
#
# x = u * (x2 - x1) + x1
# y = u * (y2 - y1) + y1
#
# for u = 0, x => x1, y => y1
# for u = 1, x => x2, y => y2
#
# The following is the Liang-Barsky Algorithm
# for segment clipping modified slightly for
# construction lines
#
_rangle = _angle * _dtr
_dx = math.cos(_rangle)
_dy = math.sin(_rangle)
_P = [-_dx, _dx, -_dy, _dy]
_q = [(_x - _xmin), (_xmax - _x), (_y - _ymin), (_ymax - _y)]
_u1 = None
_u2 = None
_valid = True
for _i in range(4):
_pi = _P[_i]
_qi = _q[_i]
if abs(_pi) < 1e-10: # this should be caught earlier ...
if _qi < 0.0:
_valid = False
break
else:
_r = _qi/_pi
if _pi < 0.0:
if _u2 is not None and _r > _u2:
_valid = False
break
if _u1 is None or _r > _u1:
_u1 = _r
else:
if _u1 is not None and _r < _u1:
_valid = False
break
if _u2 is None or _r < _u2:
_u2 = _r
if _valid:
_coords = (((_u1 * _dx) + _x),
((_u1 * _dy) + _y),
((_u2 * _dx) + _x),
((_u2 * _dy) + _y))
return _coords
def clone(self):
"""Create an identical copy of an ACLine.
clone()
"""
return ACLine(self.__keypoint.clone(), self.__angle)
def sendsMessage(self, m):
if m in ACLine.__messages:
return True
return super(ACLine, self).sendsMessage(m)
def intersect_region(acl, xmin, ymin, xmax, ymax):
if not isinstance(acl, ACLine):
raise TypeError, "Argument not an ACLine: " + `type(acl)`
_xmin = util.get_float(xmin)
_ymin = util.get_float(ymin)
_xmax = util.get_float(xmax)
if _xmax < _xmin:
raise ValueError, "Illegal values: xmax < xmin"
_ymax = util.get_float(ymax)
if _ymax < _ymin:
raise ValueError, "Illegal values: ymax < ymin"
_x, _y = acl.getLocation().getCoords()
_x1 = _y1 = _x2 = _y2 = None
if acl.isVertical() and _xmin < _x < _xmax:
_x1 = _x
_y1 = _ymin
_x2 = _x
_y2 = _ymax
elif acl.isHorizontal() and _ymin < _y < _ymax:
_x1 = _xmin
_y1 = _y
_x2 = _xmax
_y2 = _y
else:
_angle = acl.getAngle()
_slope = math.tan(_angle * _dtr)
_yint = _y - (_x * _slope)
_xt = _x + math.cos(_angle * _dtr)
_yt = _y + math.sin(_angle * _dtr)
#
# find y for x = xmin
#
_yt = (_slope * _xmin) + _yint
if _ymin < _yt < _ymax:
# print "hit at y for x=xmin"
_x1 = _xmin
_y1 = _yt
#
# find y for x = xmax
#
_yt = (_slope * _xmax) + _yint
if _ymin < _yt < _ymax:
# print "hit at y for x=xmax"
if _x1 is None:
_x1 = _xmax
_y1 = _yt
else:
_x2 = _xmax
_y2 = _yt
if _x2 is None:
#
# find x for y = ymin
#
_xt = (_ymin - _yint)/_slope
if _xmin < _xt < _xmax:
# print "hit at x for y=ymin"
if _x1 is None:
_x1 = _xt
_y1 = _ymin
else:
_x2 = _xt
_y2 = _ymin
if _x2 is None:
#
# find x for y = ymax
#
_xt = (_ymax - _yint)/_slope
if _xmin < _xt < _xmax:
# print "hit at x for y=ymax"
if _x1 is None:
_x1 = _xt
_y1 = _ymax
else:
_x2 = _xt
_y2 = _ymax
return _x1, _y1, _x2, _y2
#
# Quadtree ACLine storage
#
class ACLineQuadtree(quadtree.Quadtree):
def __init__(self):
super(ACLineQuadtree, self).__init__()
def getNodes(self, *args):
_alen = len(args)
if _alen != 3:
raise ValueError, "Expected 3 arguments, got %d" % _alen
_x = util.get_float(args[0])
_y = util.get_float(args[1])
_angle = util.get_float(args[2])
_v = abs(abs(_angle) - 90.0) < 1e-10
_h = abs(_angle) < 1e-10
_nodes = [self.getTreeRoot()]
while len(_nodes):
_node = _nodes.pop()
_xmin, _ymin, _xmax, _ymax = _node.getBoundary()
if _node.hasSubnodes():
_ne = _nw = _sw = _se = False
if _v:
if _x < _xmin or _x > _xmax:
continue
_xmid = (_xmin + _xmax)/2.0
if _x < _xmid: # left of midpoint
_nw = _sw = True
else:
_se = _ne = True
elif _h:
if _y < _ymin or _y > _ymax:
continue
_ymid = (_ymin + _ymax)/2.0
if _y < _ymid: # below midpoint
_sw = _se = True
else:
_nw = _ne = True
else:
_ne = _nw = _sw = _se = True
if _ne:
_nodes.append(_node.getSubnode(quadtree.QTreeNode.NENODE))
if _nw:
_nodes.append(_node.getSubnode(quadtree.QTreeNode.NWNODE))
if _sw:
_nodes.append(_node.getSubnode(quadtree.QTreeNode.SWNODE))
if _se:
_nodes.append(_node.getSubnode(quadtree.QTreeNode.SENODE))
else:
yield _node
def addObject(self, obj):
if not isinstance(obj, ACLine):
raise TypeError, "Argument not an ACLine: " + `type(obj)`
if obj in self:
return
_x, _y = obj.getLocation().getCoords()
_angle = obj.getAngle()
_bounds = self.getTreeRoot().getBoundary()
_xmin = _ymin = _xmax = _ymax = None
_resize = False
if _bounds is None: # first node in tree
_resize = True
_xmin = _x - 1.0
_ymin = _y - 1.0
_xmax = _x + 1.0
_ymax = _y + 1.0
else:
_xmin, _ymin, _xmax, _ymax = _bounds
if _x < _xmin:
_xmin = _x - 1.0
_resize = True
if _x > _xmax:
_xmax = _x + 1.0
_resize = True
if _y < _ymin:
_ymin = _y - 1.0
_resize = True
if _y > _ymax:
_ymax = _y + 1.0
_resize = True
if _resize:
self.resize(_xmin, _ymin, _xmax, _ymax)
for _node in self.getNodes(_x, _y, _angle):
_xmin, _ymin, _xmax, _ymax = _node.getBoundary()
if obj.inRegion(_xmin, _ymin, _xmax, _ymax):
_node.addObject(obj)
super(ACLineQuadtree, self).addObject(obj)
obj.connect('moved', self._moveACLine)
def delObject(self, obj):
if obj not in self:
return
_x, _y = obj.getLocation().getCoords()
_angle = obj.getAngle()
_pdict = {}
for _node in self.getNodes(_x, _y, _angle):
_node.delObject(obj)
_parent = _node.getParent()
if _parent is not None:
_pid = id(_parent)
if _pid not in _pdict:
_pdict[_pid] = _parent
super(ACLineQuadtree, self).delObject(obj)
obj.disconnect(self)
for _parent in _pdict.values():
self.purgeSubnodes(_parent)
def find(self, *args):
_alen = len(args)
if _alen < 3:
raise ValueError, "Invalid argument count: %d" % _alen
_x = util.get_float(args[0])
_y = util.get_float(args[1])
_angle = util.make_angle(args[2])
_t = tolerance.TOL
if _alen > 3:
_t = tolerance.toltest(args[3])
_xmin = _x - _t
_xmax = _x + _t
_ymin = _y - _t
_ymax = _y + _t
_aclines = []
for _acl in self.getInRegion(_xmin, _ymin, _xmax, _ymax):
_ax, _ay = _acl.getLocation().getCoords()
if ((abs(_ax - _x) < _t) and
(abs(_ay - _y) < _t) and
(abs(_acl.getAngle() - _angle) < 1e-10)):
_aclines.append(_acl)
return _aclines
def _moveACLine(self, obj, *args):
if obj not in self:
raise ValueError, "ACLine not stored in Quadtree: " + `obj`
_alen = len(args)
if _alen < 3:
raise ValueError, "Invalid argument count: %d" % _alen
_x = util.get_float(args[0])
_y = util.get_float(args[1])
_angle = util.get_float(args[2])
for _node in self.getNodes(_x, _y, _angle):
_node.delObject(obj) # acline may not be in node
super(ACLineQuadtree, self).delObject(obj)
obj.disconnect(self)
self.addObject(obj)
def getClosest(self, x, y, tol=tolerance.TOL):
_x = util.get_float(x)
_y = util.get_float(y)
_t = tolerance.toltest(tol)
_acline = _tsep = None
_adict = {}
_nodes = [self.getTreeRoot()]
while len(_nodes):
_node = _nodes.pop()
if _node.hasSubnodes():
_nodes.extend(_node.getSubnodes())
else:
for _a in _node.getObjects():
_aid = id(_a)
if _aid not in _adict:
_ax, _ay = _a.getProjection(_x, _y)
if abs(_ax - _x) < _t and abs(_ay - _y) < _t:
_sep = math.hypot((_ax - _x), (_ay - _y))
if _tsep is None:
_tsep = _sep
_acline = _a
else:
if _sep < _tsep:
_tsep = _sep
_acline = _a
return _acline
def getInRegion(self, xmin, ymin, xmax, ymax):
_xmin = util.get_float(xmin)
_ymin = util.get_float(ymin)
_xmax = util.get_float(xmax)
if _xmax < _xmin:
raise ValueError, "Illegal values: xmax < xmin"
_ymax = util.get_float(ymax)
if _ymax < _ymin:
raise ValueError, "Illegal values: ymax < ymin"
_acls = []
if not len(self):
return _acls
_nodes = [self.getTreeRoot()]
_adict = {}
while len(_nodes):
_node = _nodes.pop()
if _node.hasSubnodes():
_nodes.extend(_node.getSubnodes())
else:
for _acl in _node.getObjects():
_aid = id(_acl)
if _aid not in _adict:
if _acl.inRegion(_xmin, _ymin, _xmax, _ymax):
_acls.append(_acl)
_adict[_aid] = True
return _acls
#
# ACLine history class
#
class ACLineLog(conobject.ConstructionObjectLog):
def __init__(self, a):
if not isinstance(a, ACLine):
raise TypeError, "Argument not an ACLine: " + `type(a)`
super(ACLineLog, self).__init__(a)
a.connect('keypoint_changed', self._keypointChange)
a.connect('rotated', self._rotateACLine)
def _rotateACLine(self, a, *args):
_alen = len(args)
if _alen < 1:
raise ValueError, "Invalid argument count: %d" % _alen
_angle = args[0]
if not isinstance(_angle, float):
raise TypeError, "Unexpected type for angle: " + `type(_angle)`
self.saveUndoData('rotated', _angle)
def _keypointChange(self, a, *args):
_alen = len(args)
if _alen < 1:
raise ValueError, "Invalid argument count: %d" % _alen
_old = args[0]
if not isinstance(_old, point.Point):
raise TypeError, "Argument not a Point: " + `type(_old)`
self.saveUndoData('keypoint_changed', _old.getID())
def execute(self, undo, *args):
util.test_boolean(undo)
_alen = len(args)
if _alen == 0:
raise ValueError, "No arguments to execute()"
_a = self.getObject()
_p = _a.getLocation()
_op = args[0]
if _op == 'rotated':
if len(args) < 2:
raise ValueError, "Invalid argument count: %d" % _alen
_angle = args[1]
if not isinstance(_angle, float):
raise TypeError, "Unexpected type for angle: " + `type(_angle)`
_sdata = _a.getAngle()
self.ignore(_op)
try:
if undo:
_a.startUndo()
try:
_a.setAngle(_angle)
finally:
_a.endUndo()
else:
_a.startRedo()
try:
_a.setAngle(_angle)
finally:
_a.endRedo()
finally:
self.receive(_op)
self.saveData(undo, _op, _sdata)
elif _op == 'keypoint_changed':
if _alen < 2:
raise ValueError, "Invalid argument count: %d" % _alen
_oid = args[1]
_parent = _a.getParent()
if _parent is None:
raise ValueError, "ACLine has no parent - cannot undo"
_pt = _parent.getObject(_oid)
if _pt is None or not isinstance(_pt, point.Point):
raise ValueError, "Keypoint missing: id=%d" % _oid
_sdata = _p.getID()
self.ignore(_op)
try:
if undo:
_a.startUndo()
try:
_a.setLocation(_pt)
finally:
_a.endUndo()
else:
_a.startRedo()
try:
_a.setLocation(_pt)
finally:
_a.endRedo()
finally:
self.receive(_op)
self.saveData(undo, _op, _sdata)
else:
super(ACLineLog, self).execute(undo, *args)
