# Coverage for pygeodesy/booleans.py : 91%

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1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 | # -*- coding: utf-8 -*- u'''I{Boolean} operations on I{composite} polygons and I{clip}s. Classes L{BooleanFHP} and L{BooleanGH} are I{composites} and provide I{boolean} operations C{intersection}, C{difference}, C{reverse-difference}, C{sum} and C{union}. @note: A I{clip} is defined as a single, usually closed polygon, a I{composite} is a collection of one or more I{clip}s. @see: U{Forster-Hormann-Popa<https://www.ScienceDirect.com/science/ article/pii/S259014861930007X>} and U{Greiner-Hormann <http://www.Inf.USI.CH/hormann/papers/Greiner.1998.ECO.pdf>}. ''' # make sure int/int division yields float quotient, see .basics from __future__ import division as _; del _ # PYCHOK semicolon from pygeodesy.basics import isodd, isscalar, issubclassof from pygeodesy.constants import EPS, EPS2, MAX, _0_0, _0_5, _1_0 from pygeodesy.errors import ClipError, _IsnotError, _TypeError, \ _xkwds, _xkwds_get from pygeodesy.fmath import fabs, favg, hypot, hypot2 from pygeodesy.interns import NN, _BANG_, _clip_, _COMMASPACE_, _DOT_, \ _e_, _ELLIPSIS_, _few_, _height_, _lat_, \ _lon_, _name_, _scalar_, _SPACE_, _too_, \ _X_, _x_, _B_, _d_, _R_ # PYCHOK used! from pygeodesy.lazily import _ALL_LAZY, _ALL_DOCS, _ALL_MODS as _MODS from pygeodesy.named import Fmt, _Named, pairs from pygeodesy.props import Property_RO, property_RO # from pygeodesy.streprs import Fmt, pairs # from .named from pygeodesy.units import Height, HeightX # from math import fabs # from .fmath __all__ = _ALL_LAZY.booleans __version__ = '23.03.12' _0_EPS = EPS # near-zero, positive _EPS_0 = -EPS # near-zero, negative _1_EPS = _1_0 + EPS # over-one _EPS_1 = _1_0 - EPS # near-one _10EPS = EPS * 10 # see ._2Abs _alpha_ = 'alpha' _boolean_ = 'boolean' _clipid_ = 'clipid' _corners_ = 'corners' _open_ = 'open' _P_ = 'P' _Q_ = 'Q' def _Enum(txt, enum): # PYCHOK unused return txt # NN(txt, _TILDE_, str(enum)) class _L(object): # Intersection labels CROSSING = _Enum(_X_, 1) # C++ enum CROSSING_D = _Enum(_X_ + _d_, 8) CROSSINGs = (CROSSING, CROSSING_D) BOUNCING = _Enum(_B_, 2) BOUNCING_D = _Enum(_B_ + _d_, 9) BOUNCINGs = (BOUNCING, BOUNCING_D) + CROSSINGs LEFT_ON = _Enum('Lo', 3) ON_ON = _Enum('oo', 5) ON_LEFT = _Enum('oL', 6) ON_RIGHT = _Enum('oR', 7) RIGHT_ON = _Enum('Ro', 4) RIGHT_LEFT_ON = (RIGHT_ON, LEFT_ON) # Entry/Exit flags ENTRY = _Enum(_e_, 1) EXIT = _Enum(_x_, 0) Toggle = {ENTRY: EXIT, EXIT: ENTRY, None: None} _L = _L() # PYCHOK singleton class _RP(object): # RelativePosition types IS_Pm = _Enum('Pm', 2) # C++ enum IS_Pp = _Enum('Pp', 3) LEFT = _Enum('L', 0) RIGHT = _Enum(_R_, 1) _RP = _RP() # PYCHOK singleton _RP2L = {(_RP.LEFT, _RP.RIGHT): _L.CROSSING, (_RP.RIGHT, _RP.LEFT): _L.CROSSING, (_RP.LEFT, _RP.LEFT): _L.BOUNCING, (_RP.RIGHT, _RP.RIGHT): _L.BOUNCING, # overlapping cases (_RP.RIGHT, _RP.IS_Pp): _L.LEFT_ON, (_RP.IS_Pp, _RP.RIGHT): _L.LEFT_ON, (_RP.LEFT, _RP.IS_Pp): _L.RIGHT_ON, (_RP.IS_Pp, _RP.LEFT): _L.RIGHT_ON, (_RP.IS_Pm, _RP.IS_Pp): _L.ON_ON, (_RP.IS_Pp, _RP.IS_Pm): _L.ON_ON, (_RP.IS_Pm, _RP.RIGHT): _L.ON_LEFT, (_RP.RIGHT, _RP.IS_Pm): _L.ON_LEFT, (_RP.LEFT, _RP.IS_Pm): _L.ON_RIGHT, (_RP.IS_Pm, _RP.LEFT): _L.ON_RIGHT} def _alpha4(a): # Return 4-tuple (alpha, abs(alpha) near 0, 0 < alpha < 1, not 0 < alpha < 1) return (a, False, True, False) if _0_EPS < a < _EPS_1 else ( (a, False, False, True) if _0_EPS < fabs(a) else (a, True, False, False)) def _left_right_bottom_top_eps(p1, p2): '''(INTERNAL) Return 2-tuple C{(left, right), (bottom, top)}, oversized. ''' return (_min_max_eps(p1.x, p2.x), _min_max_eps(p1.y, p2.y)) def _min_max_eps(*xs): '''(INTERNAL) Return 2-tuple C{(min, max)}, oversized. ''' lo, hi = min(xs), max(xs) lo *= _1_EPS if lo < 0 else _EPS_1 hi *= _EPS_1 if hi < 0 else _1_EPS return (lo or _EPS_0), (hi or _0_EPS) def _outside(x1, x2, lo, hi): '''(INTERNAL) Is C{(x1, x2)} outside C{(lo, hi)}? ''' return max(x1, x2) < lo or min(x1, x2) > hi class _LatLonBase(_Named): '''(INTERNAL) Base class for L{LatLonFHP} and L{LatLonGH}. ''' _alpha = None # point AND intersection else length _checked = False # checked in phase 3 iff intersection _clipid = 0 # polygonal clip identifier, number _dupof = None # original of a duplicate # _e_x_str = NN # shut up PyChecker _height = Height(0) # interpolated height, usually meter _linked = None # link to neighbor iff intersection _next = None # link to the next vertex _prev = None # link to the previous vertex def __init__(self, lat_ll, lon=None, height=0, clipid=0, name=NN): '''New C{LatLon[FHP|GH]} from separate C{lat}, C{lon}, C{height} and C{clipid} scalars or from a previous C{LatLon[FHP|GH]}, a C{Clip[FHP|GH]4Tuple} or some other C{LatLon} instance. @arg lat_ll: Latitude (C{scalar}) or a lat/longitude (C{LatLon[FHP|GH]}, aC{Clip[FHP|GH]4Tuple} or some other C{LatLon}). @kwarg lon: Longitude (C{scalar}), iff B{C{lat_ll}} is scalar, ignored otherwise. @kwarg height: Height (C{scalar}), conventionally C{meter}. @kwarg clipid: Clip identifier (C{int}). @kwarg name: Optional name (C{str}). ''' if lon is None: self.y, self.x = lat_ll.lat, lat_ll.lon h = getattr(lat_ll, _height_, height) c = getattr(lat_ll, _clipid_, clipid) else: self.y, self.x = lat_ll, lon h, c = height, clipid # don't override defaults if self._height != h: self._height = h if self._clipid != c: self._clipid = c if name: self.name = name def __abs__(self): return max(fabs(self.x), fabs(self.y)) def __eq__(self, other): return other is self or (other and other.x == self.x and other.y == self.y) def __repr__(self): '''String C{repr} of this lat-/longitude. ''' t = _ELLIPSIS_(self._prev, self._next) return _SPACE_(self, Fmt.ANGLE(t)) def __str__(self): '''String C{str} of this lat-/longitude. ''' t = (_lat_, self.lat), (_lon_, self.lon) if self._height: X = _X_ if self.isintersection else NN t += (_height_ + X, self._height), if self._clipid: t += (_clipid_, self._clipid), if self._alpha is not None: t += (_alpha_, self._alpha), # if self._dupof: # recursion risk # t += (_dupof_, self._dupof.name), t = pairs(t, prec=8, fmt=Fmt.g, ints=True) t = Fmt.PAREN(_COMMASPACE_.join(t)) if self._linked: k = _DOT_ if self._checked else _BANG_ t = NN(t, self._e_x_str(k)) # PYCHOK expected return NN(self.name, t) def __sub__(self, other): return self.__class__(self.y - other.y, self.x - other.x) def _2A(self, p2, p3): # I{Signed} area of a triangle, I{doubled}. x, y = self.x, self.y return (p2.x - x) * (p3.y - y) - \ (p3.x - x) * (p2.y - y) def _2Abs(self, p2, p3, eps=_10EPS): # I{Unsigned} area of a triangle, I{doubled} # or 0 if below the given threshold C{eps}. a = fabs(self._2A(p2, p3)) return 0 if a < eps else a @property_RO def clipid(self): '''Get the I{clipid} (C{int} or C{0}). ''' return self._clipid @property_RO def height(self): '''Get the I{height} (C{Height} or C{int}). ''' h = self._height return HeightX(h) if self.isintersection else ( Height(h) if h else h) @property_RO def isintersection(self): '''Is this an intersection? ''' return bool(self._linked) @property_RO def ispoint(self): '''Is this an original (boolean) point? ''' return self._alpha is None @property_RO def lat(self): '''Get the latitude (C{scalar}). ''' return self.y def _link(self, other): # Make this and an other point are neighbors. # assert isinstance(other, self.__class__) self._linked = other other._linked = self @property_RO def lon(self): '''Get the longpitude (C{scalar}). ''' return self.x def _toClas(self, Clas, clipid): # Return this vertex as a C{Clas} instance # (L{Clip[FHP|GH]4Tuple} or L{LatLon[FHP|GH]}). return Clas(self.lat, self.lon, self.height, clipid) class LatLonFHP(_LatLonBase): '''A point or intersection in a L{BooleanFHP} clip. ''' _en_ex = None _label = None # _prep2 = None, None # shup up PyChecker _2split = None # or C{._Clip} _2xing = False def __init__(self, lat_ll, *lon_h_clipid, **name): '''New C{LatLonFHP} from separate C{lat}, C{lon}, C{h}eight and C{clipid} scalars, or from a previous L{LatLonFHP}, a L{ClipFHP4Tuple} or some other C{LatLon} instance. @arg lat_ll: Latitude (C{scalar}) or a lat/longitude (L{LatLonFHP}, C{LatLon} or L{ClipFHP4Tuple}). @arg lon_h_clipid: Longitude (C{scalar}), C{h}eight and C{clipid} iff B{C{lat_ll}} is scalar, ignored otherwise. @kwarg name: Optional name (C{str}). ''' _LatLonBase.__init__(self, lat_ll, *lon_h_clipid, **name) def __add__(self, other): return self.__class__(self.y + other.y, self.x + other.x) def __mod__(self, other): # cross product return self.x * other.y - self.y * other.x def __mul__(self, other): # dot product if not isinstance(other, self.__class__): raise _IsnotError(self.__class__.__name__, other=other) return self.x * other.x + self.y * other.y def __rmul__(self, other): # scalar product if not isscalar(other): raise _IsnotError(_scalar_, other=other) return self.__class__(self.y * other, self.x * other) def _e_x_str(self, t): if self._label: t = NN(self._label, t) if self._en_ex: t = NN(t, self._en_ex) return t @property_RO def _isduplicate(self): # Is this point a I{duplicate} intersection? p = self._dupof return bool(p and self._linked and p is not self and p == self # and p._alpha in (None, self._alpha) and self._alpha in (_0_0, p._alpha)) # @property_RO # def _isduplicated(self): # # Return the number of I{duplicates}? # d, v = 0, self # while v: # if v._dupof is self: # d += 1 # v = v._next # if v is self: # break # return d def _isinside(self, composite, *excluded): # Is this point inside a composite, # excluding certain C{_Clip}s. x, y, i = self.x, self.y, False for c in composite._clips: if c not in excluded: w = 0 for p1, p2 in c._edges2(): # edge [p1,p2] must straddle y if (p1.y < y) is not (p2.y < y): r = p2.x > x s = p2.y > p1.y if p1.x < x: b = r and (s is (p1._2A(p2, self) > 0)) else: b = r or (s is (p1._2A(p2, self) > 0)) if b: w += 1 if s else -1 if isodd(w): i = not i return i def isinside(self, *composites): '''Is this point inside I{combined} composites based on C{winding number}? @arg composites: One or more iterables or composites of clips and points (L{ClipFHP4Tuple}, L{ClipGH4Tuple}, L{LatLonFHP}, L{LatLonGH}, L{LatLon_} or any other C{LatLon}). @see: U{Algorithm 6<https://www.ScienceDirect.com/science/article/pii/ S0925772101000128>}. ''' self._isinside(_CompositeEdges(self.__class__, composites)) @property_RO def isintersection(self): '''Is this an intersection? May be C{ispoint} too! ''' return bool(self._linked) @property_RO def ispoint(self): '''Is this an I{original} point? May be C{isintersection} too! ''' return self._alpha is None @property_RO def _prev_next2(self): # Adjust 2-tuple (._prev, ._next) iff a I{duplicate} intersection p, n = self._prev, self._next if self._isduplicate: p = self._dupof while p._isduplicate: p = p._dupof p = p._prev while n._isduplicate: n = n._next return p, n # def _edge2(self): # # Return the start and end point of the # # edge containing I{intersection} C{v}. # n = p = self # while p.isintersection: # p = p._prev # if p is self: # break # while n.isintersection: # n = n._next # if n is self: # break # # assert p == self or not p._2Abs(self, n) # return p, n def _RPoracle(self, p1, p2, p3): # Relative Position oracle if p1._linked is self: # or p1._linked2(self): T = _RP.IS_Pm elif p3._linked is self: # or p3._linked2(self): T = _RP.IS_Pp elif p1._2A(p2, p3) > 0: # left turn T = _RP.LEFT if self._2A(p1, p2) > 0 and \ self._2A(p2, p3) > 0 else \ _RP.RIGHT # PYCHOK indent else: # right turn (or straight) T = _RP.RIGHT if self._2A(p1, p2) < 0 and \ self._2A(p2, p3) < 0 else \ _RP.LEFT # PYCHOK indent return T class LatLonGH(_LatLonBase): '''A point or intersection in a L{BooleanGH} clip. ''' _entry = None # entry or exit iff intersection _extend = False def __init__(self, lat_ll, *lon_h_clipid, **name): '''New C{LatLonGH} from separate C{lat}, C{lon}, C{h}eight and C{clipid} scalars, or from a previous L{LatLonGH}, a L{ClipGH4Tuple} or some other C{LatLon} instance. @arg lat_ll: Latitude (C{scalar}) or a lat/longitude (L{LatLonGH}, C{LatLon} or L{ClipGH4Tuple}). @arg lon_h_clipid: Longitude (C{scalar}), C{h}eight and C{clipid} iff B{C{lat_ll}} is scalar, ignored otherwise. @kwarg name: Optional name (C{str}). ''' _LatLonBase.__init__(self, lat_ll, *lon_h_clipid, **name) def _check(self): # Check-mark this vertex and its link. self._checked = True b = self._linked if b and not b._checked: b._checked = True def _e_x_str(self, t): return t if self._entry is None else NN(t, (_e_ if self._entry else _x_)) def _isinside(self, composite, *bottom_top): # Is this vertex inside the composite? I{Odd-even rule}. # The I{odd-even} rule counts the number of edges # intersecting a ray emitted East-bound from this # point to infinity. When I{odd} this point lies # inside, if I{even} outside. r, y = False, self.y if not (bottom_top and _outside(y, y, *bottom_top)): e = self.__class__(MAX, y, clipid=self.clipid) _i4 = _EdgeGH(self, e)._intersect4 for p1, p2, _ in composite._edges3(): for _ in _i4(p1, p2, False): r = not r return r def isinside(self, *composites): '''Is this point inside I{combined} composites based on C{odd-even rule}? @arg composites: One or more iterables or composites of clips and points (L{ClipFHP4Tuple}, L{ClipGH4Tuple}, L{LatLonFHP}, L{LatLonGH}, L{LatLon_} or any other C{LatLon}). ''' self._isinside(_CompositeEdges(self.__class__, composites)) class _Clip(_Named): '''(INTERNAL) A I{doubly-linked} list representing a I{closed} polygon of L{LatLonFHP} or L{LatLonGH} points, duplicates and intersections with other C{_Clip}s. ''' _composite = None _dups = 0 _first = None _id = 0 _identical = False _noInters = False _last = None _LL = None _len = 0 _pushback = False _Xs = 0 # number of intersections def __init__(self, composite, clipid=0): # assert isinstance(composite, _CompositeBase) self._composite = composite self._id = clipid self._LL = composite._LL composite._clips = composite._clips + (self,) def __contains__(self, p): # Is C{p} one of this clip's vertices? for v in self: if v is p: # or ==? return True return False def __iter__(self): # Yield all points and intersections. v = f = self._first while v: yield v v = v._next if v is f: break def __len__(self): # Return the number of LatLons. return self._len _all = __iter__ @property_RO def _all_ON_ON(self): # Check whether all verices are ON_ON. L_ON_ON = _L.ON_ON for v in self: if v._label is not L_ON_ON: return False return True def _append(self, y_v, *x_h_clipid): # Append a point given as C{y}, C{x}, C{h}eight and C{clipid} # args or as a C{LatLon[FHP|GH]} or C{Clip[FHP|GH}4Tuple}. self._last = v = self._LL(y_v, *x_h_clipid) if x_h_clipid else y_v self._len += 1 # assert v._clipid == self._id v._next = n = self._first if n is None: # set _first self._first = p = n = v else: # insert before _first v._prev = p = n._prev p._next = n._prev = v return v # def _appendedup(self, v, clipid=0): # # Like C{._append}, but only append C{v} if not a # # duplicate of the one previously append[edup]'ed. # y, x, p = v.y, v.x, self._last # if p is None or y != p.y or x != p.x or clipid != p._clipid: # p = self._append(y, x, v.height, clipid) # if v._linked: # p._linked = True # to force errors # return p def _closed(self, raiser): # PYCHOK unused # End a clip, close it and check length. p, f = self._last, self._first if f and f._prev is p and p == f and \ p._next is f and p is not f: # "un-close" the clip f._prev = p = p._prev p._next = f self._len -= 1 # elif f and raiser: # raise self._OpenClipError(p, f) if len(self) < 3: raise self._Error(_too_(_few_)) def _dup(self, q): # Duplicate a point (or intersection) as intersection. v = self._insert(q.x, q.y, q, q._next) v._alpha = q._alpha or _0_0 # _0_0 replaces None v._dupof = q._dupof or q # assert v._prev is q # assert q._next is v return v def _edges2(self, raiser=False, **unused): # Yield each I{original} edge as a 2-tuple # C{(LatLon[FHP|GH], LatLon[FHP|GH])}. p1 = p2 = f = self._first while p2: p2 = p2._next if p2.ispoint: yield p1, p2 p1 = p2 if p2 is f: break if raiser and p2 is not f: raise self._OpenClipError(p2, f) def _Error(self, txt): # PYCHOK no cover # Build a C{ClipError} instance kwds = dict(len=len(self), txt=txt) if self._dups: kwds.update(dups=self._dups) cp = self._composite if self._id: try: i = cp._clips.index(self) if i != self._id: kwds[_clip_] = i except ValueError: pass kwds[_clipid_] = self._id return ClipError(cp.name, cp._kind, **kwds) def _insert(self, x, y, start, end, *alpha): # insertVertex between points C{start} and # C{end}, ordered by C{alpha} iff given. v = self._LL(y, x, start._height, start._clipid) n = start._next if alpha: v._alpha = alpha = alpha[0] v._height = favg(v.height, end.height, f=alpha) # assert start is not end while n is not end and n._alpha < alpha: n = n._next v._next = n v._prev = p = n._prev p._next = n._prev = v self._len += 1 return v def _intersection(self, unused, q, *p1_p2_alpha): # insert an intersection or make a point both if p1_p2_alpha: # intersection on edge v = self._insert(q.x, q.y, *p1_p2_alpha) else: # intersection at point v = q # assert not v._linked # assert v._alpha is None return v def _intersections(self): # Yield all intersections. for v in self: if v.isintersection: yield v @Property_RO def _ishole(self): # Is this clip a hole inside its composite? v = self._first return v._isinside(self._composite, self) if v else False def _noXings(self, Union): # Are all intersections non-CROSSINGs? Ls = _L.BOUNCINGs if Union else _L.CROSSINGs for v in self._intersections(): if v._label in Ls: return False return True def _OpenClipError(self, s, e): # PYCHOK no cover # Return a C{CloseError} instance t = NN(s, _ELLIPSIS_(_COMMASPACE_, e)) return self._Error(_SPACE_(_open_, t)) def _point2(self, insert): # getNonIntersectionPoint and -Vertex if not (insert and self._noInters): for p in self._points(): if not p.isintersection: # or p._isduplicated? return p, None for n in self._intersections(): p, _ = n._prev_next2 k = p._linked if k: if n._linked not in k._prev_next2: # create a pseudo-point k = _0_5 * (p + n) if insert: k = self._insert(k.x, k.y, n._prev, n) r = k # to remove later else: # no ._prev, ._next k._clipid = n._clipid r = None return k, r return None, None def _points(self): # Yield all points in original order. for v in self: if v.ispoint: yield v def _remove2(self, v): # Remove vertex C{v}. # assert not v._isduplicated if len(self) > 1: p = v._prev p._next = n = v._next n._prev = p if self._first is v: self._first = n if self._last is v: self._last = p self._len -= 1 else: n = self._last = \ p = self._first = None self._len = 0 return p, n def _Xings(self): # Yield all I{un-checked} CROSSING intersections. CROSSING = _L.CROSSING for v in self._intersections(): if v._label is CROSSING and not v._checked: yield v class _ClipEdges(_Clip): # PYCHOK no cover # Wrapper yielding edges, eliminating # null edges and adding closing edge. def __init__(self, cps, LL): # PYCHOK signature self._cps = cps # _CompositeEdges self._LL = LL def _edges2(self, *unused): # PYCHOK signature # Yield C{LatLon[FHP|GH]} point pairs. for cp in self._cps: self._composite = cp p2 = s = None for ll in cp: p1, p2 = p2, self._LL(ll) if s is None: s = p1 = p2 elif p1._clipid != p2._clipid: if p1 != s: yield p1, s s = p1 = p2 elif p1 != p2: yield p1, p2 self._id = p2._clipid if p1 != s: yield p1, s class _CompositeBase(_Named): '''(INTERNAL) Base class for C{_CompositeFHP} and C{_CompositeGH}. ''' _clips = () # tuple of C{_Clips} _eps = EPS # null edges _kind = _corners_ _LL = _LatLonBase # shut up PyChecker _raiser = False _xtend = False def __init__(self, lls, name=NN, kind=NN, eps=EPS): # New L{_CompositeFHP} or L{_CompositeGH}. n = name or getattr(lls, _name_, NN) if n: self.name = n if kind: self._kind = kind if self._eps < eps: self._eps = eps c = _Clip(self) lp = None for ll in lls: ll = self._LL(ll) if lp is None: c._id = ll._clipid # keep clipid lp = c._append(ll) elif ll._clipid != lp._clipid: # new clip c._closed(self._raiser) c = _Clip(self, ll._clipid) lp = c._append(ll) elif abs(ll - lp) > eps: # PYCHOK lp lp = c._append(ll) else: c._dups += 1 c._closed(self._raiser) def __contains__(self, v): # PYCHOK no cover # Is C{p} one of the clips' points? for c in self._clips: if v in c: return True return False def __iter__(self): # Yield all points and intersections. for c in self._clips: for v in c: yield v def __len__(self): # Return the total number of latlons. return sum(map(len, self._clips)) if self._clips else 0 def __repr__(self): '''String C{repr} of this composite. ''' c = len(self._clips) c = Fmt.SQUARE(c) if c > 1 else NN n = Fmt.SQUARE(len(self)) t = Fmt.PAREN(self) return NN(self.__class__.__name__, c, n, t) def __str__(self): '''String C{str} of this composite. ''' return _COMMASPACE_.join(map(str, self)) @property_RO def _bottom_top_eps(self): # Get the bottom and top C{y} bounds, oversized. return _min_max_eps(min(v.y for v in self), max(v.y for v in self)) def _class(self, corners, kwds, **dflts): # Return a new instance _g = kwds.get kwds = dict((n, _g(n, v)) for n, v in dflts.items()) return self.__class__(corners or (), **kwds) @property_RO def _clipids(self): # PYCHOK no cover for c in self._clips: yield c._id def clipids(self): '''Return a tuple with all C{clipid}s, I{ordered}. ''' return tuple(self._clipids) def _edges3(self, **raiser): # Yield each I{original} edge as a 3-tuple # C{(LatLon[FHP|GH], LatLon[FHP|GH], _Clip)}. for c in self._clips: for p1, p2 in c._edges2(**raiser): yield p1, p2, c @property def eps(self): '''Get the null edges tolerance (C{degrees}, usually). ''' return self._eps @eps.setter # PYCHOK setter! def eps(self, eps): '''Set the null edges tolerance (C{degrees}, usually). ''' self._eps = eps def _10eps(self, **eps): # Get eps for _LatLonBase._2Abs e = _xkwds_get(eps, eps=self._eps) if e != EPS: e *= _10EPS / EPS else: e = _10EPS return e def _intersections(self): # Yield all intersections. for c in self._clips: for v in c._intersections(): yield v @property_RO def _left_right_eps(self): # Get the left and right C{x} bounds, oversized. return _min_max_eps(min(v.x for v in self), max(v.x for v in self)) def _kwds(self, op, **more): # Get the kwds C{dict}. kwds = dict(raiser=self.raiser, eps=self.eps, name=self.name or op.__name__) kwds.update(more) return kwds def _points(self): # PYCHOK no cover # Yield all I{original} points, # some may be intersection too. for c in self._clips: for v in c._points(): yield v @property def raiser(self): '''Get the option to throw L{ClipError} exceptions (C{bool}). ''' return self._raiser @raiser.setter # PYCHOK setter! def raiser(self, throw): '''Set the option to throw L{ClipError} exceptions (C{bool}). ''' self._raiser = bool(throw) def _results(self, _presults, Clas, closed=False, inull=False, **eps): # Yield the dedup'd results, as L{ClipFHP4Tuple}s C = self._LL if Clas is None else Clas e = self._10eps(**eps) for clipid, ns in enumerate(_presults): f = p = v = None for n in ns: if f is None: yield n._toClas(C, clipid) f = p = n elif v is None: v = n # got f, p, v elif inull or p._2Abs(v, n, eps=e): yield v._toClas(C, clipid) p, v = v, n else: # null, colinear, ... skipped v = n if v and (inull or p._2Abs(v, f, eps=e)): yield v._toClas(C, clipid) p = v if f and p != f and closed: # close clip yield f._toClas(C, clipid) def toLatLon(self, LatLon, **LatLon_kwds): '''Yield all (non-duplicate) points and intersections as an instance of B{C{LatLon}}. @kwarg LatLon: Class to use (C{LatLon}). @kwarg LatLon_kwds: Optional, additional B{C{LatLon}} keyword arguments. @raise TypeError: Invalid B{C{LatLon}}. @note: For intersections, C{height} is an instance of L{HeightX}, otherwise of L{Height}. ''' if not issubclassof(LatLon, _MODS.latlonBase.LatLonBase): raise _TypeError(LatLon=LatLon) if LatLon_kwds: _kwds = _xkwds else: def _kwds(unused, **kwds): return kwds for i, c in enumerate(self._clips): for v in c: if not v._dupof: v = LatLon(v.lat, v.lon, **_kwds(LatLon_kwds, height=v.height)) if v._clipid != i: v._clipid = i yield v class _CompositeEdges(_CompositeBase): # PYCHOK no cover # Polygon wrapper yielding clips and edges, # eliminating duplicates and closing open clips. def __init__(self, LL, composites): # PYCHOK signature self._cps = composites self._LL = LL @property_RO def _clips(self): # Use one C{_Clip}. return (_ClipEdges(self._cps, self._LL),) class _CompositeFHP(_CompositeBase): '''(INTERNAL) A list of C{_Clips} representing a I{composite} of L{LatLonFHP} points, duplicates and intersections. ''' _LL = LatLonFHP _Union = False def __init__(self, lls, raiser=False, **name_kind_eps): # New L{_CompositeFHP}. if raiser: self._raiser = True _CompositeBase.__init__(self, lls, **name_kind_eps) def _classify(self): # 2) Classify intersection chains. L = _L for v in self._intersections(): n, b = v, v._label if b in L.RIGHT_LEFT_ON: # next chain while True: # n.__dict__.pop('_label') n._label = None n = n._next if n is v or n._label is not L.ON_ON: # n._label and ... break a = L.LEFT_ON if n._label is L.ON_LEFT else L.RIGHT_ON v._label = n._label = L.BOUNCING_D if a is b else L.CROSSING_D # 3) Copy labels for v in self._intersections(): v._linked._label = v._label def _clip(self, corners, Union=False, Clas=None, **closed_inull_raiser_eps): # Clip this polygon with another one, C{corners}, # using the Foster/Hormann/Popa's algorithm. P = self Q = self._class(corners, closed_inull_raiser_eps, eps=P._eps, raiser=False) P._reset(Union, name=_P_) Q._reset(Union, name=_Q_) bt = Q._bottom_top_eps lr = Q._left_right_eps # compute and insert intersections for p1, p2, Pc in P._edges3(**closed_inull_raiser_eps): if not (_outside(p1.x, p2.x, *lr) or _outside(p1.y, p2.y, *bt)): e = _EdgeFHP(p1, p2) if e._dp2 > EPS2: # non-null edge for q1, q2, Qc in Q._edges3(**closed_inull_raiser_eps): for T, p, q in e._intersect3(q1, q2): p = Pc._intersection(T, *p) q = Qc._intersection(T, *q) # assert not p._linked # assert not q._linked p._link(q) # label and classify intersections P._labelize() P._classify() # check for special cases P._special_cases(Q) Q._special_cases(P) # handle identicals P._special_identicals(Q) # set Entry/Exit flags P._set_entry_exits(Q) Q._set_entry_exits(P) # handle splits and crossings P._splits_xings(Q) # yield the results return P._results(P._presults(Q), Clas, **closed_inull_raiser_eps) @property_RO def _identicals(self): # Yield all clips marked C{._identical}. for c in self._clips: if c._identical: yield c def _labelize(self): # 1) Intersections classification for p in self._intersections(): q = p._linked # determine local configuration at this intersection # and positions of Q- and Q+ relative to (P-, I, P+) p1, p3 = p._prev_next2 q1, q3 = q._prev_next2 t = (q1._RPoracle(p1, p, p3), q3._RPoracle(p1, p, p3)) # check intersecting and overlapping cases p._label = _RP2L.get(t, None) def _presults(self, other): # Yield the result clips, each as # a generator of L{_LatLonFHP}s for cp in (self, other): for c in cp._clips: if c._pushback: yield c._all() for c in self._clips: for X in c._Xings(): yield self._resultX(X) def _reset(self, Union=False, **unused): if Union: self._Union = True def _resultX(self, X): # Yield the result from an unchecked CROSSING. L, U, v = _L, self._Union, X while v: v._checked = True r = v # in P or Q s = L.Toggle[v._en_ex] e = (s is L.EXIT) ^ U while True: v = v._next if e else v._prev yield v v._checked = True if v._en_ex is s or v is X: break if v is r: # full circle raise ClipError(full_circle=v, clipid=v._clipid) if v is not X: v = v._linked if v is X: break def _set_entry_exits(self, other): # MCCABE 14 # 4) Set entry/exit flags L, U = _L, self._Union for c in self._clips: n, k = c._point2(True) if n: f = n s = L.EXIT if n._isinside(other) else L.ENTRY t = L.EXIT # first_chain_vertex = True while True: if n.isintersection: b = n._label if b is L.CROSSING: n._en_ex = s s = L.Toggle[s] elif b is L.BOUNCING and ((s is L.EXIT) ^ U): n._2split = c # see ._splits_xings elif b is L.CROSSING_D: n._en_ex = s if (s is t) ^ U: n._label = L.CROSSING t = L.Toggle[t] if t is L.EXIT: s = L.Toggle[s] elif b is L.BOUNCING_D: n._en_ex = s if (s is t) ^ U: n._2xing = c # see ._splits_xings s = L.Toggle[s] t = L.Toggle[t] n = n._next # _, n = n._prev_next2 if n is f: break # PYCHOK attr? if k: c._remove2(k) def _special_cases(self, other): # 3.5) Check special cases U = self._Union for c in self._clips: if c._noXings(U): c._noInters = True if c._all_ON_ON: c._identical = True else: p, _ = c._point2(False) if p and (p._isinside(other) ^ U): c._pushback = True def _special_identicals(self, other): # 3.5) Handle identicals cds = dict((c._id, c) for c in other._identicals) if cds: for c in self._identicals: for v in c._intersections(): d = cds.get(v._linked._clipid, None) if d and d._ishole is c._ishole: c._pushback = True break # next clip @property_RO def _2splits(self): # Yield all intersections marked C{._2split} for p in self._intersections(): if p._2split: # assert isinstance(p._2split, _Clip) yield p def _splits_xings(self, other): # MCCABE 15 # 5) Handle split pairs and 6) crossing candidates def _2A_dup2(p, P): p1, p2 = p._prev_next2 a2 = p1._2A(p, p2) Pc = p._2split # assert Pc in P._clips return a2, Pc._dup(p) def _links2(ps, qs): # PYCHOK P unused? # Yield each link as a 2-tuple(p, q) id_qs = set(map(id, qs)) if id_qs: for p in ps: q = p._linked if id(q) in id_qs: yield p, q L = _L E = L.ENTRY if self._Union else L.EXIT X = L.Toggle[E] for p, q in _links2(self._2splits, other._2splits): ap, pp = _2A_dup2(p, self) aq, qq = _2A_dup2(q, other) if (ap * aq) > 0: # overwrites p-q link p._link(qq) q._link(pp) else: pp._link(qq) p._en_ex = q._en_ex = E pp._en_ex = qq._en_ex = X p._label = pp._label = \ q._label = qq._label = L.CROSSING for p, q in _links2(self._2xings, other._2xings): p._label = q._label = L.CROSSING @property_RO def _2xings(self): # Yield all intersections marked C{._2xing} for p in self._intersections(): if p._2xing: yield p class _CompositeGH(_CompositeBase): '''(INTERNAL) A list of C{_Clips} representing a I{composite} of L{LatLonGH} points, duplicates and intersections. ''' _LL = LatLonGH _xtend = False def __init__(self, lls, raiser=False, xtend=False, **name_kind_eps): # New L{_CompositeGH}. if xtend: self._xtend = True elif raiser: self._raiser = True _CompositeBase.__init__(self, lls, **name_kind_eps) def _clip(self, corners, s_entry, c_entry, Clas=None, **closed_inull_raiser_xtend_eps): # Clip this polygon with another one, C{corners}. # Core of Greiner/Hormann's algorithm, enhanced U{Correia's # <https://GitHub.com/helderco/univ-polyclip>} implementation*** # and extended to optionally handle so-called "degenerate cases" S = self C = self._class(corners, closed_inull_raiser_xtend_eps, raiser=False, xtend=False) bt = C._bottom_top_eps lr = C._left_right_eps # 1. find intersections for s1, s2, Sc in S._edges3(**closed_inull_raiser_xtend_eps): if not (_outside(s1.x, s2.x, *lr) or _outside(s1.y, s2.y, *bt)): e = _EdgeGH(s1, s2, **closed_inull_raiser_xtend_eps) if e._hypot2 > EPS2: # non-null edge for c1, c2, Cc in C._edges3(**closed_inull_raiser_xtend_eps): for x, y, sa, ca in e._intersect4(c1, c2): s = Sc._insert(x, y, s1, s2, sa) c = Cc._insert(x, y, c1, c2, ca) s._link(c) # 2. identify entry/exit intersections if S._first: s_entry ^= S._first._isinside(C, *bt) for v in S._intersections(): v._entry = s_entry = not s_entry if C._first: c_entry ^= C._first._isinside(S) for v in C._intersections(): v._entry = c_entry = not c_entry # 3. yield the result(s) return S._results(S._presults(), Clas, **closed_inull_raiser_xtend_eps) @property_RO def _first(self): # Get the very first vertex for v in self: return v return None def _kwds(self, op, **more): # Get the kwds C{dict}. return _CompositeBase._kwds(self, op, xtend=self.xtend, **more) def _presults(self): # Yield the unchecked intersection(s). for c in self._clips: for v in c._intersections(): if not v._checked: yield self._resultU(v) def _resultU(self, v): # Yield the result from an un-checked intersection. while v and not v._checked: v._check() yield v r = v e = v._entry while True: v = v._next if e else v._prev yield v if v._linked: break if v is r: raise ClipError(full_circle=v, clipid=v._clipid) v = v._linked # switch @property def xtend(self): '''Get the attempt to handle I{degenerate cases} (C{bool}). ''' return self._xtend @xtend.setter # PYCHOK setter! def xtend(self, xtend): '''Set the attempt to handle I{degenerate cases} (C{bool}). ''' self._xtend = bool(xtend) class _EdgeFHP(object): # An edge between two L{LatLonFHP} points. X_INTERSECT = _Enum('Xi', 1) # C++ enum X_OVERLAP = _Enum('Xo', 5) P_INTERSECT = _Enum('Pi', 3) P_OVERLAP = _Enum('Po', 7) Ps = (P_INTERSECT, P_OVERLAP, X_OVERLAP) Q_INTERSECT = _Enum('Qi', 2) Q_OVERLAP = _Enum('Qo', 6) Qs = (Q_INTERSECT, Q_OVERLAP, X_OVERLAP) V_INTERSECT = _Enum('Vi', 4) V_OVERLAP = _Enum('Vo', 8) Vs = (V_INTERSECT, V_OVERLAP) def __init__(self, p1, p2, **unused): # New edge between points C{p1} and C{p2}, each a L{LatLonFHP}. self._p1_p2 = p1, p2 self._dp = dp = p2 - p1 self._dp2 = dp * dp # dot product, hypot2 self._lr, \ self._bt = _left_right_bottom_top_eps(p1, p2) def _intersect3(self, q1, q2): # Return intersection Type or C{None} if not (_outside(q1.x, q2.x, *self._lr) or _outside(q1.y, q2.y, *self._bt)): T, E = None, _EdgeFHP # self.__class__ dq = q2 - q1 dq2 = dq * dq # dot product, hypot2 if dq2 > EPS2: # like ._clip p1, p2 = self._p1_p2 ap1 = p1._2A(q1, q2) ap2_1 = p2._2A(q1, q2) - ap1 if fabs(ap2_1) > _0_EPS: # non-parallel edges aq1 = q1._2A(p1, p2) aq2_1 = q2._2A(p1, p2) - aq1 if fabs(aq2_1) > _0_EPS: # compute and classify alpha and beta a, a_0, a_0_1, _ = _alpha4(-ap1 / ap2_1) b, b_0, b_0_1, _ = _alpha4(-aq1 / aq2_1) # distinguish intersection types T = E.X_INTERSECT if a_0_1 and b_0_1 else ( E.P_INTERSECT if a_0_1 and b_0 else ( E.Q_INTERSECT if a_0 and b_0_1 else ( E.V_INTERSECT if a_0 and b_0 else None))) elif fabs(ap1) < _0_EPS: # parallel or colinear edges dp = self._dp d1 = q1 - p1 # compute and classify alpha and beta a, a_0, a_0_1, _a_0_1 = _alpha4((d1 * dp) / self._dp2) b, b_0, b_0_1, _b_0_1 = _alpha4((d1 * dq) / (-dq2)) # distinguish overlap type T = E.X_OVERLAP if a_0_1 and b_0_1 else ( E.P_OVERLAP if a_0_1 and _b_0_1 else ( E.Q_OVERLAP if _a_0_1 and b_0_1 else ( E.V_OVERLAP if a_0 and b_0 else None))) if T: if T is E.X_INTERSECT: v = p1 + a * self._dp yield T, (v, p1, p2, a), (v, q1, q2, b) elif T in E.Vs: yield T, (p1,), (q1,) else: if T in E.Qs: yield T, (p1,), (p1, q1, q2, b) if T in E.Ps: yield T, (q1, p1, p2, a), (q1,) class _EdgeGH(object): # An edge between two L{LatLonGH} points. _raiser = False _xtend = False def __init__(self, s1, s2, raiser=False, xtend=False, **unused): # New edge between points C{s1} and C{s2}, each a L{LatLonGH}. self._s1, self._s2 = s1, s2 self._x_sx_y_sy = (s1.x, s2.x - s1.x, s1.y, s2.y - s1.y) self._lr, \ self._bt = _left_right_bottom_top_eps(s1, s2) if xtend: self._xtend = True elif raiser: self._raiser = True def __str__(self): return 'edge(%s, %s)' % (self._s1, self._s2) def _alpha1(self, alpha): a = max(_0_0, min(alpha, _1_0)) if fabs(a - alpha) < _0_EPS: return a raise ClipError('alpha outside [0..1]: %.3f' % (alpha,)) def _alpha2(self, x, y, dx, dy): # Return C{(alpha)}, see .points.nearestOn5 a = (y * dy + x * dx) / self._hypot2 d = (y * dx - x * dy) / self._hypot0 return a, fabs(d) def _error(self, n, c1, c2): t = _SPACE_(self._intersect4.__name__, _EdgeGH(c1, c2)) raise ClipError('unhandled case %s' % (n,), txt=t) @Property_RO def _hypot0(self): _, sx, _, sy = self._x_sx_y_sy return hypot(sx, sy) * _0_EPS @Property_RO def _hypot2(self): _, sx, _, sy = self._x_sx_y_sy return hypot2(sx, sy) def _intersect4(self, c1, c2, parallel=True): # MCCABE 14 # Yield the intersections of this and another edge. # @return: None, 1 or 2 intersections, each a 4-Tuple # (x, y, s_alpha, c_alpha) with intersection # x, y and both alphas. # @raise ClipError: Intersection unhandled. # @see: U{Intersection point of two line segments # <http://PaulBourke.net/geometry/pointlineplane/>}. c1_x, c1_y = c1.x, c1.y if not (_outside(c1_x, c2.x, *self._lr) or _outside(c1_y, c2.y, *self._bt)): x, sx, \ y, sy = self._x_sx_y_sy cx = c2.x - c1_x cy = c2.y - c1_y d = cy * sx - cx * sy if fabs(d) > _0_EPS: # non-parallel edges dx = x - c1_x dy = y - c1_y ca = (sx * dy - sy * dx) / d if _0_EPS < ca < _EPS_1 or (self._xtend and _EPS_0 < ca < _1_EPS): sa = (cx * dy - cy * dx) / d if _0_EPS < sa < _EPS_1 or (self._xtend and _EPS_0 < sa < _1_EPS): yield (x + sa * sx), (y + sa * sy), sa, ca # unhandled, "degenerate" cases 1, 2 or 3 elif self._raiser and not (sa < _EPS_0 or sa > _1_EPS): self._error(1, c1, c2) # intersection at s1 or s2 elif self._raiser and not (ca < _EPS_0 or ca > _1_EPS): # intersection at c1 or c2 or at c1 or c2 and s1 or s2 sa = (cx * dy - cy * dx) / d e = 2 if sa < _EPS_0 or sa > _1_EPS else 3 self._error(e, c1, c2) elif parallel and (sx or sy) and (cx or cy): # PYCHOK no cover # non-null, parallel or colinear edges sa1, d1 = self._alpha2(c1_x - x, c1_y - y, sx, sy) sa2, d2 = self._alpha2(c2.x - x, c2.y - y, sx, sy) if max(d1, d2) < _0_EPS: if self._xtend and not _outside(sa1, sa2, _EPS_0, _1_EPS): if sa1 > sa2: # anti-parallel sa1, sa2 = sa2, sa1 ca1, ca2 = _1_0, _0_0 else: # parallel ca1, ca2 = _0_0, _1_0 ca = fabs((sx / cx) if cx else (sy / cy)) # = hypot(sx, sy) / hypot(cx, cy) if sa1 < 0: # s1 is between c1 and c2 ca *= ca1 + sa1 yield x, y, ca1, self._alpha1(ca) else: # c1 is between s1 and s2 yield (x + sa1 * sx), (y + sa1 * sy), sa1, ca1 if sa2 > 1: # s2 is between c1 and c2 ca *= sa2 - _1_0 yield (x + sx), (y + sy), ca2, self._alpha1(ca2 - ca) else: # c2 is between s1 and s2 yield (x + sa2 * sx), (y + sa2 * sy), sa2, ca2 elif self._raiser and not _outside(sa1, sa2, _0_0, _1_EPS): self._error(4, c1, c2) # def _intersect4(self, c1, c2, **unused): # # Intersect this and another edge. # # # @return: 4-Tuple (x, y, s_alpha, c_alpha) with the # # intersection point x, y and both alphas. # # # @raise ClipError: Intersection unhandled. # # # @see: U{Intersection point of two line segments # # <http://PaulBourke.net/geometry/pointlineplane/>}. # # if _outside(c1.x, c2.x, *self._left_right_eps) or \ # _outside(c1.y, c2.y, *self._bottom_top_eps): # sa = ca = None # else: # x, sx, \ # y, sy = self._x_sx_y_sy # # cx = c2.x - c1.x # cy = c2.y - c1.y # d = cy * sx - cx * sy # # if fabs(d) > _0_EPS: # non-parallel edges # dx = x - c1.x # dy = y - c1.y # sa = (cx * dy - cy * dx) / d # ca = (sx * dy - sy * dx) / d # if _0_EPS < ca < _EPS_1: # if _0_EPS < sa < _EPS_1: # yield (x + sa * sx), (y + sa * sy), sa, ca # # # unhandled, "degenerate" cases 1, 2 or 3 # elif self.raiser and not (sa < _EPS_0 or sa > _1_EPS): # self._error(1, c1, c2) # insection at s1 or s2 # # elif self.raiser and not (ca < _EPS_0 or ca > _1_EPS): # # intersection at c1 or c2 or at c1 or c2 and s1 or s2 # self._error(2 if sa < _EPS_0 or sa > _1_EPS else 3, c1, c2) # # elif self.raiser and (sx or sy) and (cx or cy): # # null, parallel or colinear edges # h = hypot(sx, sy) * _0_EPS # if min(_perpendicular(c1.x - x, c1.y - y, sx, sy), # _perpendicular(c2.x - x, c2.y - y, sx, sy)) < h: # self._error(4, c1, c2) # colinear, overlapping class _BooleanBase(object): # Shared C{Boolean[FHP|GH]} methods. _kwds = {} # shut up PyChecker def __add__(self, other): '''Sum: C{this + other} clips. ''' kwds = self._kwds(self.__add__) bc = self.__class__(self, **kwds) LL = bc._LL for c in self._other(other)._clips: b = _Clip(bc, c._id) for v in c: b._append(LL(v)) return bc def __and__(self, other): '''Intersection: C{this & other}. ''' return self._boolean(other, False, False, self.__and__) # PYCHOK OK def __iadd__(self, other): '''In-place sum: C{this += other}. ''' return self._inplace(self.__add__(other)) def __iand__(self, other): '''In-place intersection: C{this &= other}. ''' return self._inplace(self.__and__(other)) def __ior__(self, other): '''In-place union: C{this |= other}. ''' return self._inplace(self.__or__(other)) def __or__(self, other): '''Union: C{this | other}. ''' return self._boolean(other, True, True, self.__or__) # PYCHOK OK def __radd__(self, other): '''Reverse sum: C{other + this}. ''' return self._other(other).__add__(self) def __rand__(self, other): '''Reverse intersection: C{other & this} ''' return self._other(other).__and__(self) def __ror__(self, other): '''Reverse union: C{other | this} ''' return self._other(other).__or__(self) def _inplace(self, r): # Replace this with a L{Boolean*} result. self._clips, r._clips = r._clips, None # if self._raiser != r._raiser: # self._raiser = r._raiser # if self._xtend != r._xtend: # self._xtend = r._xtend # if self._eps != r._eps: # self._eps = r._eps return self def _other(self, other): B = self.__class__ if isinstance(other, B): return other raise TypeError('not %s: %r' % (B.__name__, other)) class BooleanFHP(_CompositeFHP, _BooleanBase): '''I{Composite} polygon class providing I{boolean} operations between two I{composite} polygons using the U{Forster-Hormann-Popa <https://www.ScienceDirect.com/science/article/pii/S259014861930007X>}'s C++ implementation, transcoded to pure Python. The supported operations between (composite) polygon A and B are: - C = A & B or A &= B, intersection of A and B - C = A + B or A += B, sum of the A and B clips - C = A | B or A |= B, union of A and B @see: Function L{clipFHP4} and class L{BooleanGH}. ''' _kind = _boolean_ def __init__(self, lls, raiser=False, eps=EPS, name=NN): '''New L{BooleanFHP} operand for I{boolean} operation. @arg lls: The polygon points and clips (iterable of L{LatLonFHP}s, L{ClipFHP4Tuple}s or other C{LatLon}s). @kwarg raiser: If C{True}, throw L{ClipError} exceptions (C{bool}). @kwarg esp: Tolerance for eliminating null edges (C{degrees}, same units as the B{C{lls}} coordinates). @kwarg name: Optional name (C{str}). ''' _CompositeFHP.__init__(self, lls, raiser=raiser, eps=eps, name=name) def _boolean(self, other, Union, unused, op): k = self._kwds(op) P = BooleanFHP(self, **k) Q = self._other(other) r = P._clip(Q, Union=Union, **k) return BooleanFHP(r, **k) def _ErrorOp(self, op): return NotImplementedError(_DOT_(self.named2, op.__name__)) def __isub__(self, unused): '''In-place difference: C{this -= other}. ''' raise self._ErrorOp(self.__isub__) def __rsub__(self, unused): ''' Reverse difference: C{other - this} ''' raise self._ErrorOp(self.__rsub__) def __sub__(self, unused): '''Difference: C{this - other}. ''' raise self._ErrorOp(self.__sub__) class BooleanGH(_CompositeGH, _BooleanBase): '''I{Composite} polygon class providing I{boolean} operations between two I{composite} polygons using the U{Greiner-Hormann <http://www.Inf.USI.CH/hormann/papers/Greiner.1998.ECO.pdf>} algorithm, U{Correia<https://GitHub.com/helderco/univ-polyclip>}'s implementation, modified and extended. The supported operations between (composite) polygon A and B are: - C = A - B or A -= B, difference A less B - C = B - A or B -= A, difference B less B - C = A & B or A &= B, intersection of A and B - C = A + B or A += B, sum of the A and B clips - C = A | B or A |= B, union of A and B @note: To handle I{degenerate cases} like C{point-edge} and C{point-point} intersections, use class L{BooleanFHP}. @see: Function L{clipGH4} and class L{BooleanFHP}. ''' _kind = _boolean_ def __init__(self, lls, raiser=True, xtend=False, eps=EPS, name=NN): '''New L{BooleanFHP} operand for I{boolean} operation. @arg lls: The polygon points and clips (iterable of L{LatLonGH}s, L{ClipGH4Tuple}s or other C{LatLon}s). @kwarg raiser: If C{True}, throw L{ClipError} exceptions (C{bool}). @kwarg xtend: If C{True}, extend edges of I{degenerate cases}, an attempt to handle the latter (C{bool}). @kwarg esp: Tolerance for eliminating null edges (C{degrees}, same units as the B{C{lls}} coordinates). @kwarg name: Optional name (C{str}). ''' _CompositeGH.__init__(self, lls, raiser=raiser, xtend=xtend, eps=eps, name=name) def _boolean(self, other, s_entry, c_entry, op): k = self._kwds(op) S = BooleanGH(self, **k) C = self._other(other) r = S._clip(C, s_entry, c_entry, **k) return BooleanGH(r, **k) def __isub__(self, other): '''In-place difference: C{this -= other}. ''' return self._inplace(self.__sub__(other)) def __rsub__(self, other): ''' Reverse difference: C{other - this} ''' return self._other(other).__sub__(self) def __sub__(self, other): '''Difference: C{this - other}. ''' return self._boolean(other, True, False, self.__sub__) __all__ += _ALL_DOCS(_Clip, _CompositeBase, _CompositeFHP, _CompositeGH, _LatLonBase) # **) MIT License # # Copyright (C) 2018-2023 -- mrJean1 at Gmail -- All Rights Reserved. # # Permission is hereby granted, free of charge, to any person obtaining a # copy of this software and associated documentation files (the "Software"), # to deal in the Software without restriction, including without limitation # the rights to use, copy, modify, merge, publish, distribute, sublicense, # and/or sell copies of the Software, and to permit persons to whom the # Software is furnished to do so, subject to the following conditions: # # The above copyright notice and this permission notice shall be included # in all copies or substantial portions of the Software. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS # OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL # THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR # OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, # ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR # OTHER DEALINGS IN THE SOFTWARE. # ***) GNU GPL 3 # # Copyright (C) 2011-2012 Helder Correia <Helder.MC@Gmail.com> # # This program 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 3 of # the License, or any later version. # # 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 General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see <http://www.GNU.org/licenses/>. # # You should have received the README file along with this program. # If not, see <https://GitHub.com/helderco/univ-polyclip>.