Added python bindings for voronoi diagram construction and accessing the resulting vertices.

src/Mod/Path/App/VoronoiPyImp.cpp

@@ -0,0 +1,164 @@
+/***************************************************************************
+ *   Copyright (c) sliptonic (shopinthewoods@gmail.com) 2020               *
+ *                                                                         *
+ *   This file is part of the FreeCAD CAx development system.              *
+ *                                                                         *
+ *   This library is free software; you can redistribute it and/or         *
+ *   modify it under the terms of the GNU Library General Public           *
+ *   License as published by the Free Software Foundation; either          *
+ *   version 2 of the License, or (at your option) any later version.      *
+ *                                                                         *
+ *   This library  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 library; see the file COPYING.LIB. If not,    *
+ *   write to the Free Software Foundation, Inc., 59 Temple Place,         *
+ *   Suite 330, Boston, MA  02111-1307, USA                                *
+ *                                                                         *
+ ***************************************************************************/
+
+#include "PreCompiled.h"
+
+
+#ifndef _PreComp_
+# include <boost/algorithm/string.hpp>
+#endif
+
+#include "Mod/Path/App/Voronoi.h"
+#include "Mod/Path/App/VoronoiVertex.h"
+#include <Base/Exception.h>
+#include <Base/GeometryPyCXX.h>
+#include <Base/Vector3D.h>
+#include <Base/VectorPy.h>
+
+// files generated out of VoronoiPy.xml
+#include "VoronoiPy.h"
+#include "VoronoiPy.cpp"
+#include "VoronoiVertexPy.h"
+
+using namespace Path;
+
+// returns a string which represents the object e.g. when printed in python
+std::string VoronoiPy::representation(void) const
+{
+  std::stringstream ss;
+  ss.precision(5);
+  ss << "Voronoi("
+    << "{" << getVoronoiPtr()->segments.size() << ", " << getVoronoiPtr()->points.size() << "}"
+    << " -> "
+    << "{" << getVoronoiPtr()->numCells() << ", " << getVoronoiPtr()->numEdges() << ", " << getVoronoiPtr()->numVertices() << "}"
+    << ")";
+  return ss.str();
+}
+
+
+PyObject *VoronoiPy::PyMake(struct _typeobject *, PyObject *, PyObject *)  // Python wrapper
+{
+  // create a new instance of VoronoiPy and its twin object
+  return new VoronoiPy(new Voronoi);
+}
+
+// constructor
+int VoronoiPy::PyInit(PyObject* args, PyObject* /*kwds*/)
+{
+  if (!PyArg_ParseTuple(args, "")) {
+    PyErr_SetString(PyExc_RuntimeError, "no arguments accepted");
+    return -1;
+  }
+  return 0;
+}
+
+Voronoi::point_type getPointFromPy(PyObject *obj) {
+  if (obj) {
+    if (PyObject_TypeCheck(obj, &Base::VectorPy::Type)) {
+      Base::Vector3d *vect = (static_cast<Base::VectorPy*>(obj))->getVectorPtr();
+      return Voronoi::point_type(vect->x, vect->y);
+    } else if (PyObject_TypeCheck(obj, Base::Vector2dPy::type_object())) {
+      Base::Vector2d vect = Py::toVector2d(obj);
+      return Voronoi::point_type(vect.x, vect.y);
+    }
+  }
+  throw Py::TypeError("Points must be Base::Vector or Base::Vector2d");
+  return Voronoi::point_type();
+}
+
+PyObject* VoronoiPy::addPoint(PyObject *args) {
+  PyObject *obj = 0;
+  if (PyArg_ParseTuple(args, "O", &obj)) {
+    getVoronoiPtr()->points.push_back(getPointFromPy(obj));
+  }
+  Py_INCREF(Py_None);
+  return Py_None;
+}
+
+PyObject* VoronoiPy::addSegment(PyObject *args) {
+  PyObject *objBegin = 0;
+  PyObject *objEnd   = 0;
+
+  if (PyArg_ParseTuple(args, "OO", &objBegin, &objEnd)) {
+    auto p0 = getPointFromPy(objBegin);
+    auto p1 = getPointFromPy(objEnd);
+    getVoronoiPtr()->segments.push_back(Voronoi::segment_type(p0, p1));
+  }
+  Py_INCREF(Py_None);
+  return Py_None;
+}
+
+PyObject* VoronoiPy::construct(PyObject *args) {
+  if (!PyArg_ParseTuple(args, "")) {
+    throw  Py::RuntimeError("no arguments accepted");
+  }
+  getVoronoiPtr()->construct();
+
+  Py_INCREF(Py_None);
+  return Py_None;
+}
+
+PyObject* VoronoiPy::numCells(PyObject *args)
+{
+  if (!PyArg_ParseTuple(args, "")) {
+    throw  Py::RuntimeError("no arguments accepted");
+  }
+  return PyLong_FromLong(getVoronoiPtr()->numCells());
+}
+
+PyObject* VoronoiPy::numEdges(PyObject *args)
+{
+  if (!PyArg_ParseTuple(args, "")) {
+    throw  Py::RuntimeError("no arguments accepted");
+  }
+  return PyLong_FromLong(getVoronoiPtr()->numEdges());
+}
+
+PyObject* VoronoiPy::numVertices(PyObject *args)
+{
+  if (!PyArg_ParseTuple(args, "")) {
+    throw  Py::RuntimeError("no arguments accepted");
+  }
+  return PyLong_FromLong(getVoronoiPtr()->numVertices());
+}
+
+Py::List VoronoiPy::getVertices(void) const {
+  Py::List list;
+  for (int i=0; i<getVoronoiPtr()->numVertices(); ++i) {
+    list.append(Py::asObject(new VoronoiVertexPy(new VoronoiVertex(getVoronoiPtr()->vd, i))));
+  }
+  return list;
+}
+
+// custom attributes get/set
+
+PyObject *VoronoiPy::getCustomAttributes(const char* /*attr*/) const
+{
+  return 0;
+}
+
+int VoronoiPy::setCustomAttributes(const char* /*attr*/, PyObject* /*obj*/)
+{
+  return 0;
+}
+
+