From: Danielle Bolan Date: Tue, 15 Jul 2014 16:20:38 +0000 (+0200) Subject: 3d Plot working X-Git-Tag: 1.0~109 X-Git-Url: https://scm.cri.ensmp.fr/git/linpy.git/commitdiff_plain/1695c920d030869b3a842736fe5bcf963f2ffc52 3d Plot working --- diff --git a/examples/diamond.py b/examples/diamond.py index 5d0de4e..e82581e 100755 --- a/examples/diamond.py +++ b/examples/diamond.py @@ -2,7 +2,17 @@ from pypol import * -x, y = symbols('x y') +x, y, z = symbols('x y z') diam = Ge(y, x - 1) & Le(y, x + 1) & Ge(y, -x - 1) & Le(y, -x + 1) print('diamond:', diam) -print('projected on x:', diam.project([y])) +print() +rhom1 = Le(0, x) & Le(x, 3) & Le(0, y) & Le(y, 3) & Le(0, z) & Le(z, 3) \ +& Le(z - 2, x) & Ge(z + 2, x) & Ge(z - 1, -x) & Le(z - 5, -x) \ +& Le(z - 2, y) & Ge(z + 2, y) & Ge(z - 1, -y) & Le(z - 5, -y) \ +& Le(y - 2, x) & Ge(y + 2, x) & Ge(y - 1, -x) & Le(y - 5, -x) +rhom1.plot() +rhom2 = rhom1 & Le(x + y + z, 7) & Ge(-2, -x - y - z ) \ +& Le(x + y - z, 4) & Ge(x + y - z, -1) \ +& Le(x - y + z, 4) & Ge(x - y + z, -1) \ +& Le(-x + y + z, 4) & Ge(-x + y + z, -1) +rhom2.plot() diff --git a/pypol/domains.py b/pypol/domains.py index 10d12c5..28ce533 100644 --- a/pypol/domains.py +++ b/pypol/domains.py @@ -67,11 +67,17 @@ class Domain(GeometricObject): return self._dimension def disjoint(self): + """ + Returns this set as disjoint. + """ islset = self._toislset(self.polyhedra, self.symbols) islset = libisl.isl_set_make_disjoint(mainctx, islset) return self._fromislset(islset, self.symbols) def isempty(self): + """ + Returns true if this set is an Empty set. + """ islset = self._toislset(self.polyhedra, self.symbols) empty = bool(libisl.isl_set_is_empty(islset)) libisl.isl_set_free(islset) @@ -81,18 +87,27 @@ class Domain(GeometricObject): return not self.isempty() def isuniverse(self): + """ + Returns true if this set is the Universe set. + """ islset = self._toislset(self.polyhedra, self.symbols) universe = bool(libisl.isl_set_plain_is_universe(islset)) libisl.isl_set_free(islset) return universe def isbounded(self): + """ + Returns true if this set is bounded. + """ islset = self._toislset(self.polyhedra, self.symbols) bounded = bool(libisl.isl_set_is_bounded(islset)) libisl.isl_set_free(islset) return bounded def __eq__(self, other): + """ + Returns true if two sets are equal. + """ symbols = self._xsymbols([self, other]) islset1 = self._toislset(self.polyhedra, symbols) islset2 = other._toislset(other.polyhedra, symbols) @@ -102,6 +117,9 @@ class Domain(GeometricObject): return equal def isdisjoint(self, other): + """ + Return True if two sets have a null intersection. + """ symbols = self._xsymbols([self, other]) islset1 = self._toislset(self.polyhedra, symbols) islset2 = self._toislset(other.polyhedra, symbols) @@ -111,6 +129,9 @@ class Domain(GeometricObject): return equal def issubset(self, other): + """ + Report whether another set contains this set. + """ symbols = self._xsymbols([self, other]) islset1 = self._toislset(self.polyhedra, symbols) islset2 = self._toislset(other.polyhedra, symbols) @@ -120,9 +141,15 @@ class Domain(GeometricObject): return equal def __le__(self, other): + """ + Returns true if this set is less than or equal to another set. + """ return self.issubset(other) def __lt__(self, other): + """ + Returns true if this set is less than another set. + """ symbols = self._xsymbols([self, other]) islset1 = self._toislset(self.polyhedra, symbols) islset2 = self._toislset(other.polyhedra, symbols) @@ -132,23 +159,31 @@ class Domain(GeometricObject): return equal def complement(self): + """ + Returns the complement of this set. + """ islset = self._toislset(self.polyhedra, self.symbols) islset = libisl.isl_set_complement(islset) return self._fromislset(islset, self.symbols) def __invert__(self): + """ + Returns the complement of this set. + """ return self.complement() def simplify(self): - #does not change anything in any of the examples - #isl seems to do this naturally + """ + Returns a set without redundant constraints. + """ islset = self._toislset(self.polyhedra, self.symbols) islset = libisl.isl_set_remove_redundancies(islset) return self._fromislset(islset, self.symbols) def aspolyhedron(self): - # several types of hull are available - # polyhedral seems to be the more appropriate, to be checked + """ + Returns polyhedral hull of set. + """ from .polyhedra import Polyhedron islset = self._toislset(self.polyhedra, self.symbols) islbset = libisl.isl_set_polyhedral_hull(islset) @@ -158,7 +193,9 @@ class Domain(GeometricObject): return self def project(self, dims): - # use to remove certain variables + """ + Return new set with given dimensions removed. + """ islset = self._toislset(self.polyhedra, self.symbols) n = 0 for index, symbol in reversed(list(enumerate(self.symbols))): @@ -173,6 +210,9 @@ class Domain(GeometricObject): return Domain._fromislset(islset, dims) def sample(self): + """ + Returns a single subset of the input. + """ islset = self._toislset(self.polyhedra, self.symbols) islpoint = libisl.isl_set_sample_point(islset) if bool(libisl.isl_point_is_void(islpoint)): @@ -188,6 +228,9 @@ class Domain(GeometricObject): return point def intersection(self, *others): + """ + Return the intersection of two sets as a new set. + """ if len(others) == 0: return self symbols = self._xsymbols((self,) + others) @@ -198,9 +241,15 @@ class Domain(GeometricObject): return self._fromislset(islset1, symbols) def __and__(self, other): + """ + Return the intersection of two sets as a new set. + """ return self.intersection(other) def union(self, *others): + """ + Return the union of sets as a new set. + """ if len(others) == 0: return self symbols = self._xsymbols((self,) + others) @@ -211,12 +260,21 @@ class Domain(GeometricObject): return self._fromislset(islset1, symbols) def __or__(self, other): + """ + Return a new set with elements from both sets. + """ return self.union(other) def __add__(self, other): + """ + Return new set containing all elements in both sets. + """ return self.union(other) def difference(self, other): + """ + Return the difference of two sets as a new set. + """ symbols = self._xsymbols([self, other]) islset1 = self._toislset(self.polyhedra, symbols) islset2 = other._toislset(other.polyhedra, symbols) @@ -224,26 +282,39 @@ class Domain(GeometricObject): return self._fromislset(islset, symbols) def __sub__(self, other): + """ + Return the difference of two sets as a new set. + """ return self.difference(other) def lexmin(self): + """ + Return a new set containing the lexicographic minimum of the elements in the set. + """ islset = self._toislset(self.polyhedra, self.symbols) islset = libisl.isl_set_lexmin(islset) return self._fromislset(islset, self.symbols) def lexmax(self): + """ + Return a new set containing the lexicographic maximum of the elements in the set. + """ islset = self._toislset(self.polyhedra, self.symbols) islset = libisl.isl_set_lexmax(islset) return self._fromislset(islset, self.symbols) def num_parameters(self): - #could be useful with large, complicated polyhedrons + """ + Return the total number of parameters, input, output or set dimensions. + """ islbset = self._toislbasicset(self.equalities, self.inequalities, self.symbols) num = libisl.isl_basic_set_dim(islbset, libisl.isl_dim_set) return num def involves_dims(self, dims): - #could be useful with large, complicated polyhedrons + """ + Returns true if set depends on given dimensions. + """ islset = self._toislset(self.polyhedra, self.symbols) dims = sorted(dims) symbols = sorted(list(self.symbols)) @@ -264,8 +335,12 @@ class Domain(GeometricObject): _RE_COORDINATE = re.compile(r'\((?P\-?\d+)\)(/(?P\d+))?') def vertices(self): - #returning list of verticies + """ + Return a list of vertices for this Polygon. + """ from .polyhedra import Polyhedron + if not self.isbounded(): + raise ValueError('domain must be bounded') islbset = self._toislbasicset(self.equalities, self.inequalities, self.symbols) vertices = libisl.isl_basic_set_compute_vertices(islbset); vertices = islhelper.isl_vertices_vertices(vertices) @@ -286,6 +361,7 @@ class Domain(GeometricObject): coordinate = -Fraction(constant, coefficient) coordinates.append((symbol, coordinate)) else: + # horrible hack, find a cleaner solution string = islhelper.isl_multi_aff_to_str(expr) matches = self._RE_COORDINATE.finditer(string) @@ -299,6 +375,9 @@ class Domain(GeometricObject): return points def points(self): + """ + Returns the points contained in the set. + """ if not self.isbounded(): raise ValueError('domain must be bounded') from .polyhedra import Universe, Eq @@ -468,6 +547,9 @@ class Domain(GeometricObject): def And(*domains): + """ + Return the intersection of two sets as a new set. + """ if len(domains) == 0: from .polyhedra import Universe return Universe @@ -475,6 +557,9 @@ def And(*domains): return domains[0].intersection(*domains[1:]) def Or(*domains): + """ + Return the union of sets as a new set. + """ if len(domains) == 0: from .polyhedra import Empty return Empty @@ -482,4 +567,7 @@ def Or(*domains): return domains[0].union(*domains[1:]) def Not(domain): + """ + Returns the complement of this set. + """ return ~domain diff --git a/pypol/polyhedra.py b/pypol/polyhedra.py index 6b5f9ab..5d1bfa1 100644 --- a/pypol/polyhedra.py +++ b/pypol/polyhedra.py @@ -71,9 +71,15 @@ class Polyhedron(Domain): return self, def disjoint(self): + """ + Return this set as disjoint. + """ return self def isuniverse(self): + """ + Return true if this set is the Universe set. + """ islbset = self._toislbasicset(self.equalities, self.inequalities, self.symbols) universe = bool(libisl.isl_basic_set_is_universe(islbset)) @@ -81,6 +87,9 @@ class Polyhedron(Domain): return universe def aspolyhedron(self): + """ + Return polyhedral hull of this set. + """ return self def __contains__(self, point): @@ -263,7 +272,7 @@ class Polyhedron(Domain): for m in points[1:]: om = Vector(o, m) normprod = norm_oa * om.norm() - cosinus = oa.dot(om) / normprod + cosinus = max(oa.dot(om) / normprod, -1.) sinus = u.dot(oa.cross(om)) / normprod angle = math.acos(cosinus) angle = math.copysign(angle, sinus) @@ -282,44 +291,78 @@ class Polyhedron(Domain): return faces def plot(self): + """ + Display 3D plot of set. + """ import matplotlib.pyplot as plt - from matplotlib.path import Path import matplotlib.patches as patches if len(self.symbols)> 3: raise TypeError elif len(self.symbols) == 2: - verts = self.vertices() - points = [] - codes = [Path.MOVETO] - for vert in verts: - pairs = () - for sym in sorted(vert, key=Symbol.sortkey): - num = vert.get(sym) - pairs = pairs + (num,) - points.append(pairs) - points.append((0.0, 0.0)) - num = len(points) - while num > 2: - codes.append(Path.LINETO) - num = num - 1 - else: - codes.append(Path.CLOSEPOLY) - path = Path(points, codes) - fig = plt.figure() - ax = fig.add_subplot(111) - patch = patches.PathPatch(path, facecolor='blue', lw=2) - ax.add_patch(patch) - ax.set_xlim(-5,5) - ax.set_ylim(-5,5) - plt.show() + import pylab + points = [] + for verts in self.vertices(): + pairs=() + for coordinate, point in verts.coordinates(): + pairs = pairs + (float(point),) + points.append(pairs) + cent=(sum([p[0] for p in points])/len(points),sum([p[1] for p in points])/len(points)) + points.sort(key=lambda p: math.atan2(p[1]-cent[1],p[0]-cent[0])) + pylab.scatter([p[0] for p in points],[p[1] for p in points]) + pylab.gca().add_patch(patches.Polygon(points,closed=True,fill=True)) + pylab.grid() + pylab.show() elif len(self.symbols)==3: - return 0 - + from mpl_toolkits.mplot3d import Axes3D + from mpl_toolkits.mplot3d.art3d import Poly3DCollection + faces = self.faces() + fig = plt.figure() + ax = Axes3D(fig) + for face in faces: + points = [] + vertices = Polyhedron._sort_polygon_3d(face) + for verts in vertices: + pairs=() + for coordinate, point in verts.coordinates(): + pairs = pairs + (float(point),) + points.append(pairs) + collection = Poly3DCollection([points], alpha=0.7) + face_color = [0.5, 0.5, 1] # alternative: matplotlib.colors.rgb2hex([0.5, 0.5, 1]) + collection.set_facecolor(face_color) + ax.add_collection3d(collection) + ax.set_xlabel('X') + ax.set_xlim(0, 5) + ax.set_ylabel('Y') + ax.set_ylim(0, 5) + ax.set_zlabel('Z') + ax.set_zlim(0, 5) + plt.grid() + plt.show() return points - + + @classmethod + def limit(cls, faces, variable, lim): + sym = [] + if variable is 'x': + n = 0 + elif variable is 'y': + n = 1 + elif variable is 'z': + n = 2 + for face in faces: + for vert in face: + coordinates = vert.coordinates() + for point in enumerate(coordinates): + coordinates.get(n) + sym.append(points) + if lim == 0: + value = min(sym) + else: + value = max(sym) + return value def _polymorphic(func): @functools.wraps(func) @@ -341,26 +384,44 @@ def _polymorphic(func): @_polymorphic def Lt(left, right): + """ + Return true if the first set is less than the second. + """ return Polyhedron([], [right - left - 1]) @_polymorphic def Le(left, right): + """ + Return true the first set is less than or equal to the second. + """ return Polyhedron([], [right - left]) @_polymorphic def Eq(left, right): + """ + Return true if the sets are equal. + """ return Polyhedron([left - right], []) @_polymorphic def Ne(left, right): + """ + Return true if the sets are NOT equal. + """ return ~Eq(left, right) @_polymorphic def Gt(left, right): + """ + Return true if the first set is greater than the second set. + """ return Polyhedron([], [left - right - 1]) @_polymorphic def Ge(left, right): + """ + Return true if the first set is greater than or equal the second set. + """ return Polyhedron([], [left - right])