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skylinespolyencode_py.cpp
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skylinespolyencode_py.cpp
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#include <Python.h>
#include "structmember.h"
#include <list>
#include "SkyLinesPolyEncoder.h"
using namespace std;
typedef struct {
PyObject_HEAD
SkyLinesPolyEncoder* spe;
} SkyLinesPolyEncoderPy;
static int
SkyLinesPolyEncoderPy_init(SkyLinesPolyEncoderPy *self, PyObject *args, PyObject *kwargs)
{
// FIXME: how to specify method signature?
// defaults
int numLevels=18;
int zoomFactor=2;
double threshold=0.00001;
int forceEndpoints=1;
static char *kwlist[] = {"num_levels", "zoom_factor", "threshold", "force_endpoints", NULL};
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|iidi", kwlist,
&numLevels, &zoomFactor, &threshold, &forceEndpoints))
return NULL;
self->spe = new SkyLinesPolyEncoder(numLevels, zoomFactor, threshold, forceEndpoints);
return 0;
}
static void
SkyLinesPolyEncoderPy_dealloc(SkyLinesPolyEncoderPy *self) {
delete self->spe;
self->ob_type->tp_free((PyObject*)self);
}
static PyObject*
SkyLinesPolyEncoderPy_classify(SkyLinesPolyEncoderPy *self, PyObject *args, PyObject *kwargs) {
// FIXME: how to specify method signature?
PyObject *p_points;
char *type = "\0";
bool remove = true;
static char *kwlist[] = {"p_points", "remove", "type", NULL};
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "O|bs", kwlist,
&p_points, &remove, &type))
return NULL;
// Check we actually have a sequence of two-tuples and populate a
// std::vector with the values. It'd be nice to pass the values through
// without iterating needlessly...
if (!(p_points = PySequence_Fast(p_points, "expected sequence type"))) {
return NULL;
}
Py_ssize_t nPoints = PySequence_Fast_GET_SIZE(p_points);
vector<vector<double> > n_points;
for (Py_ssize_t i=0; i<nPoints; i++) {
// check the item is a tuple
PyObject *p_vertices = PySequence_Fast(PySequence_Fast_GET_ITEM(p_points, i), "expected sequence type");
if (!p_vertices) {
return NULL;
}
// and its length is at least 2
if (PySequence_Fast_GET_SIZE(p_vertices) < 2) {
PyErr_SetString(PyExc_TypeError, "expected (n>=2)-tuple with numbers ((x0, y0), (x1, y1), ...)");
return NULL;
}
// get the first two values from the item and check they're numbers
vector<double> n_c;
for (int j=0; j<PySequence_Fast_GET_SIZE(p_vertices); j++) {
PyObject *p_c = PySequence_Fast_GET_ITEM(p_vertices, j);
if (!PyNumber_Check(p_c)) {
PyErr_SetString(PyExc_TypeError, "expected (n>=2)-tuple with numbers ((x0, y0), (x1, y1), ...)");
return NULL;
}
// get as double
PyObject *pf_c = PyNumber_Float(p_c);
n_c.push_back(PyFloat_AsDouble(pf_c));
Py_DECREF(pf_c);
}
// add to our vector
n_points.push_back(n_c);
Py_DECREF(p_vertices);
}
Py_DECREF(p_points);
// do our encoding
vector<int> n_levels;
// might as well allow some other threads to run...
Py_BEGIN_ALLOW_THREADS
n_levels = self->spe->dpEncode(n_points, type);
Py_END_ALLOW_THREADS
// build a dictionary of the results
// {'points':[...], 'levels':[...], 'numLevels':#, 'zoomFactor':#}
PyObject *p_result = PyDict_New();
PyObject *ep, *el, *zf, *nl;
PyObject *points = PyList_New(0);
PyObject *levels = PyList_New(0);
for (size_t i=0; i < n_points.size(); i++) {
if (remove && n_levels[i] == -1) continue;
ep = PyTuple_New(n_points.at(i).size());
int j = 0;
for (vector<double>::iterator it = n_points.at(i).begin(); it != n_points.at(i).end(); it++) {
PyTuple_SetItem(ep, j, PyFloat_FromDouble( *it ));
j++;
}
if (PyList_Append(points, ep))
return NULL;
Py_DECREF(ep);
}
if (PyDict_SetItemString(p_result, "points", points))
return NULL;
Py_DECREF(points);
for (size_t i=0; i < n_levels.size(); i++) {
if (remove && n_levels[i] == -1) continue;
el = PyInt_FromLong(n_levels[i]);
if (PyList_Append(levels, el))
return NULL;
Py_DECREF(el);
}
if (PyDict_SetItemString(p_result, "levels", levels))
return NULL;
Py_DECREF(levels);
zf = PyInt_FromLong(self->spe->getZoomFactor());
if (PyDict_SetItemString(p_result, "zoomFactor", zf))
return NULL;
Py_DECREF(zf);
nl = PyInt_FromLong(self->spe->getNumLevels());
if (PyDict_SetItemString(p_result, "numLevels", nl))
return NULL;
Py_DECREF(nl);
return p_result;
}
static PyObject*
SkyLinesPolyEncoderPy_encodeList(SkyLinesPolyEncoderPy *self, PyObject *args) {
// FIXME: how to specify method signature?
PyObject *p_list;
if (!PyArg_ParseTuple(args, "O", &p_list))
return NULL;
// Check we actually have a sequence of two-tuples and populate a
// std::vector with the values. It'd be nice to pass the values through
// without iterating needlessly...
if (!(p_list = PySequence_Fast(p_list, "expected sequence type"))) {
return NULL;
}
Py_ssize_t nList = PySequence_Fast_GET_SIZE(p_list);
list<int> n_list;
for (Py_ssize_t i=0; i<nList; i++) {
PyObject *p_c = PySequence_Fast_GET_ITEM(p_list, i);
if (!PyNumber_Check(p_c)) {
PyErr_SetString(PyExc_TypeError, "expected list with numbers");
return NULL;
}
PyObject *pn = PyNumber_Int(p_c);
n_list.push_back(PyInt_AsLong(pn));
Py_DECREF(pn);
}
Py_DECREF(p_list);
// do our encoding
string n_result;
// might as well allow some other threads to run...
Py_BEGIN_ALLOW_THREADS
n_result = self->spe->encodeList(n_list);
Py_END_ALLOW_THREADS
// return the result
PyObject *el;
el = PyString_FromString(n_result.c_str());
return el;
}
static PyObject*
SkyLinesPolyEncoderPy_encode(SkyLinesPolyEncoderPy *self, PyObject *args) {
// FIXME: how to specify method signature?
PyObject *p_points;
PyObject *p_levels;
if (!PyArg_ParseTuple(args, "OO", &p_points, &p_levels))
return NULL;
// Check we actually have a sequence of two-tuples and populate a
// std::vector with the values. It'd be nice to pass the values through
// without iterating needlessly...
if (!(p_points = PySequence_Fast(p_points, "expected sequence type"))) {
return NULL;
}
if (!(p_levels = PySequence_Fast(p_levels, "expected sequence type"))) {
return NULL;
}
Py_ssize_t nPoints = PySequence_Fast_GET_SIZE(p_points);
Py_ssize_t nLevels = PySequence_Fast_GET_SIZE(p_levels);
if (nPoints != nLevels) {
PyErr_SetString(PyExc_ValueError, "number of points not equal number of levels");
return NULL;
}
vector<pair<double,double> > n_points;
vector<int> n_levels;
for (Py_ssize_t i=0; i<nPoints; i++) {
// check the item is a tuple
PyObject *p_vertices = PySequence_Fast(PySequence_Fast_GET_ITEM(p_points, i), "expected sequence type");
if (!p_vertices) {
return NULL;
}
// and its length is at least 2 (ignore 3D coordinates if present)
if (PySequence_Fast_GET_SIZE(p_vertices) < 2) {
PyErr_SetString(PyExc_TypeError, "expected two-tuple with numbers ((x0, y0), (x1, y1), ...)");
return NULL;
}
// get the first two values from the item and check they're numbers
double n_c[2];
for (int j=0; j<2; j++) {
PyObject *p_c = PySequence_Fast_GET_ITEM(p_vertices, j);
if (!PyNumber_Check(p_c)) {
PyErr_SetString(PyExc_TypeError, "expected two-tuple with numbers ((x0, y0), (x1, y1), ...)");
return NULL;
}
// get as double
PyObject *pf_c = PyNumber_Float(p_c);
n_c[j] = PyFloat_AsDouble(pf_c);
Py_DECREF(pf_c);
}
// add to our vector
n_points.push_back(pair<double,double>(n_c[0], n_c[1]));
Py_DECREF(p_vertices);
PyObject *p_c = PySequence_Fast_GET_ITEM(p_levels, i);
if (!PyNumber_Check(p_c)) {
PyErr_SetString(PyExc_TypeError, "expected list with numbers");
return NULL;
}
PyObject *pn = PyNumber_Int(p_c);
n_levels.push_back(PyInt_AsLong(pn));
Py_DECREF(pn);
}
Py_DECREF(p_points);
Py_DECREF(p_levels);
// do our encoding
auto_ptr<pair<string, string> > n_result;
// might as well allow some other threads to run...
Py_BEGIN_ALLOW_THREADS
n_result = self->spe->encode(n_points, n_levels);
Py_END_ALLOW_THREADS
// build a dictionary of the results
// {'points':'...', 'levels':'...'}
PyObject *p_result = PyDict_New();
PyObject *ep, *el;
ep = PyString_FromString(n_result->first.c_str());
if (PyDict_SetItemString(p_result, "points", ep))
return NULL;
Py_DECREF(ep);
el = PyString_FromString(n_result->second.c_str());
if (PyDict_SetItemString(p_result, "levels", el))
return NULL;
Py_DECREF(el);
return p_result;
}
static PyMemberDef SkyLinesPolyEncoderPy_members[] = {
{NULL} /* Sentinel */
};
static PyMethodDef SkyLinesPolyEncoderPy_methods[] = {
{"classify", (PyCFunction)SkyLinesPolyEncoderPy_classify, METH_VARARGS|METH_KEYWORDS, "Classify a sequence of points"},
{"encode", (PyCFunction)SkyLinesPolyEncoderPy_encode, METH_VARARGS, "Encode a sequence of classified (lon,lat)-points"},
{"encodeList", (PyCFunction)SkyLinesPolyEncoderPy_encodeList, METH_VARARGS, "Encode a sequence of numbers"},
{NULL} /* Sentinel */
};
static PyTypeObject SkyLinesPolyEncoderPyType = {
PyObject_HEAD_INIT(NULL)
0, /*ob_size*/
"skylinespolyencode.SkyLinesPolyEncoder", /*tp_name*/
sizeof(SkyLinesPolyEncoderPy), /*tp_basicsize*/
0, /*tp_itemsize*/
(destructor)SkyLinesPolyEncoderPy_dealloc, /*tp_dealloc*/
0, /*tp_print*/
0, /*tp_getattr*/
0, /*tp_setattr*/
0, /*tp_compare*/
0, /*tp_repr*/
0, /*tp_as_number*/
0, /*tp_as_sequence*/
0, /*tp_as_mapping*/
0, /*tp_hash */
0, /*tp_call*/
0, /*tp_str*/
0, /*tp_getattro*/
0, /*tp_setattro*/
0, /*tp_as_buffer*/
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /*tp_flags*/
"SkyLines Polyline Encoder", /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
SkyLinesPolyEncoderPy_methods, /* tp_methods */
SkyLinesPolyEncoderPy_members, /* tp_members */
0, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
(initproc)SkyLinesPolyEncoderPy_init, /* tp_init */
0, /* tp_alloc */
PyType_GenericNew, /* tp_new */
};
static PyMethodDef skylinespolyencode_methods[] = {
{NULL} /* Sentinel */
};
#ifndef PyMODINIT_FUNC /* declarations for DLL import/export */
#define PyMODINIT_FUNC void
#endif
PyMODINIT_FUNC
initskylinespolyencode(void)
{
PyObject* m;
if (PyType_Ready(&SkyLinesPolyEncoderPyType) < 0)
return;
m = Py_InitModule3("skylinespolyencode", skylinespolyencode_methods,
"SkyLines Polyline encoding (C++ extension)");
if (m == NULL)
return;
Py_INCREF(&SkyLinesPolyEncoderPyType);
PyModule_AddObject(m, "SkyLinesPolyEncoder", (PyObject *)&SkyLinesPolyEncoderPyType);
}