libraries/pyshapelib/shapelibmodule.c

#include "shapefil.h"
#include "pyshapelib_common.h"
#include "pyshapelib_api.h"

/* --- SHPObject ----------------------------------------------------------------------------------------------------- */

typedef struct
{
        PyObject_HEAD
        SHPObject* shpObject;
}
PySHPObject;

static PyObject* PySHPObject_new(PyTypeObject* type, PyObject* args, PyObject* kwds)
{
        PySHPObject* self;      
        self = (PySHPObject*) type->tp_alloc(type, 0);
        self->shpObject = NULL;
        return (PyObject*) self;
}

static void PySHPObject_dealloc(PySHPObject* self)
{
        SHPDestroyObject(self->shpObject);
        self->shpObject = NULL;
        self->ob_type->tp_free((PyObject*)self);
}

/* The constructor of SHPObject. parts is a list of lists of tuples
* describing the parts and their vertices just likethe output of the
* vertices() method. part_type_list is the list of part-types and may
* be NULL. For the meaning of the part-types and their default value
* see the Shaplib documentation.
*/
static int PySHPObject_init(PySHPObject* self, PyObject* args, PyObject* kwds)
{
        int type;
        int id;
        PyObject* parts = NULL; 
        PyObject* part_type_list = NULL;
        
        int num_parts;
        int num_vertices;
        int part_start;
        
        double* xs = NULL;
        double* ys = NULL;
        int* part_starts = NULL;
        int* part_types = NULL;
        
        int i;
        int return_code = -1;
        
        /* first, unpack parameters */
        if (kwds != NULL && PyDict_Size(kwds) > 0)
        {
                PyErr_Format(PyExc_TypeError, "shapelib.SHPObject.__init__ takes no keyword arguments");
                return -1;
        }
        if (!PyArg_ParseTuple(args, "iiO|O", &type, &id, &parts, &part_type_list)) return -1;

        if (!PySequence_Check(parts))
        {
                PyErr_SetString(PyExc_TypeError, "parts is not a sequence");
                return -1;
        }
        num_parts = PySequence_Length(parts);
        if (num_parts < 0)
        {
                PyErr_SetString(PyExc_TypeError, "cannot determine length of parts");
                return -1;
        }
        
        /* parts and part_types have to have the same lengths */
        if (part_type_list)
        {
                if (!PySequence_Check(parts))
                {
                        PyErr_SetString(PyExc_TypeError, "part_type_list is not a sequence");
                        return -1;
                }
                if (PySequence_Length(part_type_list) != num_parts)
                {
                        PyErr_SetString(PyExc_TypeError, "parts and part_types have to have the same lengths");
                        return -1;
                }
        }

        /* determine how many vertices there are altogether */
        num_vertices = 0;
        for (i = 0; i < num_parts; ++i)
        {
                PyObject* part = PySequence_ITEM(parts, i);
                if (!PySequence_Check(part))
                {
                        PyErr_SetString(PyExc_TypeError, "at least one item in parts is not a sequence");
                        Py_DECREF(part);
                        return -1;
                }
                num_vertices += PySequence_Length(part);
                Py_DECREF(part);
        }

        /* allocate the memory for the various arrays and check for memory errors */
        xs = malloc(num_vertices * sizeof(double));
        ys = malloc(num_vertices * sizeof(double));
        part_starts = malloc(num_parts * sizeof(int));
        part_types = part_type_list ? malloc(num_parts * sizeof(int)) : 0;

        if (!xs || !ys || !part_starts || (part_type_list && !part_types))
        {
                PyErr_NoMemory();
                goto exit;
        }

        /* convert the part types */
        if (part_type_list)
        {
                for (i = 0; i < num_parts; i++)
                {
                        PyObject* otype = PySequence_ITEM(part_type_list, i);
                        part_types[i] = PyInt_AsLong(otype);
                        Py_DECREF(otype);
                        if (part_types[i] < 0)
                        {
                                PyErr_SetString(PyExc_TypeError, "at least one item in part_type_list is not an integer or is negative");
                                goto exit;
                        }
                }
        }

        /* convert the list of parts */
        part_start = 0;
        for (i = 0; i < num_parts; ++i)
        {
                int j, length;
                
                PyObject* part = PySequence_ITEM(parts, i);
                length = PySequence_Length(part);
                part_starts[i] = part_start;

                for (j = 0; j < length; ++j)
                {
                        PyObject* vertex = PySequence_ITEM(part, j);
                        if (!PyArg_ParseTuple(vertex, "dd", xs + part_start + j, ys + part_start + j))
                        {
                                PyErr_SetString(PyExc_TypeError, "at least one part contains an vertex that's not a tuple of two doubles");
                                Py_DECREF(vertex);
                                Py_DECREF(part);
                                goto exit;
                        }
                        Py_DECREF(vertex);
                }
                Py_DECREF(part);
                part_start += length;
        }

        self->shpObject = SHPCreateObject(type, id, num_parts, part_starts, part_types, num_vertices, xs, ys, NULL, NULL);
        return_code = 0;
        
exit:
        free(xs);
        free(ys);
        free(part_starts);
        free(part_types);
        return return_code;
}

/*
* The extents() method of SHPObject.
*
* Return the extents as a tuple of two 4-element lists with the min.
* and max. values of x, y, z, m.
*/
static PyObject* PySHPObject_extents(PySHPObject* self)
{
        SHPObject* object = self->shpObject;
        return Py_BuildValue("(dddd)(dddd)",
                        object->dfXMin, object->dfYMin, object->dfZMin, object->dfMMin, 
                        object->dfXMax, object->dfYMax, object->dfZMax, object->dfMMax);
}


/*
* The vertices() method of SHPObject.
*
* Return the x and y coords of the vertices as a list of lists of
* tuples.
*/

static PyObject* build_vertex_list(SHPObject *object, int index, int length);

static PyObject* PySHPObject_vertices(PySHPObject* self)
{
        PyObject *result = NULL;
        PyObject *part = NULL;
        int part_idx, vertex_idx;
        int length = 0;
        SHPObject* object = self->shpObject;

        if (object->nParts > 0)
        {
                /* A multipart shape. Usual for SHPT_ARC and SHPT_POLYGON */
        
                result = PyList_New(object->nParts);
        if (!result)
                return NULL;

        for (part_idx = 0, vertex_idx = 0; part_idx < object->nParts;
                part_idx++)
        {
                if (part_idx < object->nParts - 1)
                length = (object->panPartStart[part_idx + 1]
                        - object->panPartStart[part_idx]);
                else
                length = object->nVertices - object->panPartStart[part_idx];
                
                part = build_vertex_list(object, vertex_idx, length);
                if (!part)
                goto fail;

                if (PyList_SetItem(result, part_idx, part) < 0)
                goto fail;

                vertex_idx += length;
        }
        }
        else
        {
        /* only one part. usual for SHPT_POINT */
        result = build_vertex_list(object, 0, object->nVertices);
        }

        return result;

fail:
        Py_XDECREF(part);
        Py_DECREF(result);
        return NULL;
}


/* Return the length coordinates of the shape object starting at vertex
* index as a Python-list of tuples. Helper function for
* SHPObject_vertices.
*/
static PyObject* build_vertex_list(SHPObject *object, int index, int length)
{
        int i;
        PyObject * list;
        PyObject * vertex = NULL;

        list = PyList_New(length);
        if (!list)
        return NULL;

        for (i = 0; i < length; i++, index++)
        {
        vertex = Py_BuildValue("dd", object->padfX[index],
                                object->padfY[index]);
        if (!vertex)
                goto fail;
        if (PyList_SetItem(list, i, vertex) < 0)
                goto fail;
        }

        return list;

fail:
        Py_XDECREF(vertex);
        Py_DECREF(list);
        return NULL;
}

static PyObject* PySHPObject_type(PySHPObject* self, void* closure)
{
        return PyInt_FromLong(self->shpObject->nSHPType);
}

static PyObject* PySHPObject_id(PySHPObject* self, void* closure)
{
        return PyInt_FromLong(self->shpObject->nShapeId);
}

static PyMethodDef PySHPObject_methods[] = 
{
        {"extents", (PyCFunction)PySHPObject_extents, METH_NOARGS, NULL},
        {"vertices", (PyCFunction)PySHPObject_vertices, METH_NOARGS, NULL},
        {NULL}
};

static PyGetSetDef PySHPObject_getsetters[] = 
{
        {"type", (getter)PySHPObject_type, NULL, NULL },
        {"id", (getter)PySHPObject_id, NULL, NULL },
        {NULL}
};

static PyTypeObject PySHPObjectType = PYSHAPELIB_DEFINE_TYPE(PySHPObject, "shapelib.SHPObject", 0);


/* --- ShapeFile ----------------------------------------------------------------------------------------------------- */

typedef struct
{
        PyObject_HEAD
        SHPHandle handle;
}
PyShapeFile;

static PyObject* PyShapeFile_new(PyTypeObject* type, PyObject* args, PyObject* kwds)
{
        PyShapeFile* self;      
        self = (PyShapeFile*) type->tp_alloc(type, 0);
        self->handle = NULL;
        return (PyObject*) self;
}

static int PyShapeFile_init(PyShapeFile* self, PyObject* args, PyObject* kwds)
{
        char* file;
        char* mode = "rb";
        if (kwds != NULL && PyDict_Size(kwds) > 0)
        {
                PyErr_Format(PyExc_TypeError, "shapelib.ShapeFile.__init__ takes no keyword arguments");
                return -1;
        }
        if (!PyArg_ParseTuple(args, "s|s", &file, &mode)) return -1;
        
        self->handle = SHPOpen(file, mode);
        return self->handle ? 0 : -1;
}

static PyObject* PyShapeFile_close(PyShapeFile* self)
{
        SHPClose(self->handle);
        self->handle = NULL;
        Py_RETURN_NONE;
}

static void PyShapeFile_dealloc(PyShapeFile* self)
{
        PyShapeFile_close(self);
        self->ob_type->tp_free((PyObject*)self);
}

static PyObject* PyShapeFile_info(PyShapeFile* self)
{
        SHPHandle handle = self->handle;
        return Py_BuildValue("ii(dddd)(dddd)",
                        handle->nRecords, handle->nShapeType,
                        handle->adBoundsMin[0], handle->adBoundsMin[1], handle->adBoundsMin[2], handle->adBoundsMin[3],
                        handle->adBoundsMax[0], handle->adBoundsMax[1], handle->adBoundsMax[2], handle->adBoundsMax[3]);
}

static PyObject* PyShapeFile_read_object(PyShapeFile* self, PyObject* args)
{
        int index;
        SHPObject* object;
        PySHPObject* result;
        
        if (!PyArg_ParseTuple(args, "i", &index)) return NULL;
        
        object = SHPReadObject(self->handle, index);    
        if (!object)
        {
                PyErr_SetString(PyExc_RuntimeError, "failed to read object");
                return NULL;
        }
        
        result = PyObject_New(PySHPObject, &PySHPObjectType);
        if (!result)
        {
                return PyErr_NoMemory();
        }
        
        result->shpObject = object;
        return (PyObject*) result;
}

static PyObject* PyShapeFile_write_object(PyShapeFile* self, PyObject* args)
{
        int index, result;
        PyObject* object;
        
        if (!PyArg_ParseTuple(args, "iO", &index, &object)) return NULL;
        
        if (!PyObject_IsInstance(object, (PyObject*)&PySHPObjectType))
        {
                PyErr_SetString(PyExc_TypeError, "object is not a SHPObject");
                return NULL;
        }
        
        result = SHPWriteObject(self->handle, index, ((PySHPObject*)object)->shpObject);
        if (result < 0)
        {
                PyErr_SetString(PyExc_RuntimeError, "failed to write object");
                return NULL;
        }
        return PyInt_FromLong((long)result);
}

static PyObject* PyShapeFile_cobject(PyShapeFile* self)
{
        return PyCObject_FromVoidPtr(self->handle, NULL);
}

static PyMethodDef PyShapeFile_methods[] = 
{
        {"close", (PyCFunction)PyShapeFile_close, METH_NOARGS, "close the shape file" },
        {"info", (PyCFunction)PyShapeFile_info, METH_NOARGS, 
                "Return a tuple (NUM_SHAPES, TYPE, MIN, MAX) where NUM_SHAPES is the number of shapes in the file, TYPE is the "
                "shape type and MIN and MAX are 4-element tuples with the min. and max. values of the data." },
        {"read_object", (PyCFunction)PyShapeFile_read_object, METH_VARARGS, "Return object number i" },
        {"write_object", (PyCFunction)PyShapeFile_write_object, METH_VARARGS, "Write an object"},
        {"cobject", (PyCFunction)PyShapeFile_cobject, METH_NOARGS, "Return the shapelib SHPHandle as a Python CObject"},
        {NULL}
};

static PyGetSetDef PyShapeFile_getsetters[] = 
{
        {NULL}
};

static PyTypeObject PyShapeFileType = PYSHAPELIB_DEFINE_TYPE(PyShapeFile, "shapelib.ShapeFile", 0);

/* --- shapelib ------------------------------------------------------------------------------------------------------ */

static PyObject* shapelib_open(PyObject* module, PyObject* args)
{
        return PyObject_CallObject((PyObject*)&PyShapeFileType, args);
}

static PyObject* shapelib_create(PyObject* module, PyObject* args)
{
        char* file;
        int type;
        PyShapeFile* result;
        
        if (!PyArg_ParseTuple(args, "si", &file, &type)) return NULL;
        
        result = PyObject_New(PyShapeFile, &PyShapeFileType);
        if (!result)
        {
                return PyErr_NoMemory();
        }
        
        result->handle = SHPCreate(file, type);
        if (!result->handle)
        {
                PyObject_Del((PyObject*)result);
                PyErr_SetString(PyExc_RuntimeError, "Failed to create ShapeFile");
                return NULL;
        }
        
        return (PyObject*) result;
}
        
static PyShapeLibAPI shapelib_the_api = 
{
        SHPReadObject,
        SHPDestroyObject,
        SHPCreateTree,
        SHPDestroyTree,
        SHPTreeFindLikelyShapes
};

static PyObject* shapelib_c_api(PyObject* module) 
{
        return PyCObject_FromVoidPtr(&shapelib_the_api, NULL);
}

static PyObject* shapelib_type_name(PyObject* module, PyObject* args)
{
        int type;
        if (!PyArg_ParseTuple(args, "i", &type)) return NULL;
        return PyString_FromString(SHPTypeName(type));
}

static PyObject* shapelib_part_type_name(PyObject* module, PyObject* args)
{
        int type;
        if (!PyArg_ParseTuple(args, "i", &type)) return NULL;
        return PyString_FromString(SHPPartTypeName(type));
}

static PyMethodDef shapelib_methods[] = 
{
        {"open", (PyCFunction)shapelib_open, METH_VARARGS, "open a ShapeFile" },
        {"create", (PyCFunction)shapelib_create, METH_VARARGS, "create a ShapeFile" },
        {"c_api", (PyCFunction)shapelib_c_api, METH_NOARGS, "get C API of shapelib" },
        {"type_name", (PyCFunction)shapelib_type_name, METH_VARARGS, "return type as string" },
        {"part_type_name", (PyCFunction)shapelib_part_type_name, METH_VARARGS, "return part type as string" },
        {NULL}
};

PyMODINIT_FUNC initshapelib(void)
{
        PyObject* module = Py_InitModule("shapelib", shapelib_methods);
        if (!module) return;
        
        PYSHAPELIB_ADD_TYPE(PySHPObjectType, "SHPObject");
        PYSHAPELIB_ADD_TYPE(PyShapeFileType, "ShapeFile");
        
        PYSHAPELIB_ADD_CONSTANT(SHPT_NULL);
        PYSHAPELIB_ADD_CONSTANT(SHPT_POINT);
        PYSHAPELIB_ADD_CONSTANT(SHPT_ARC);
        PYSHAPELIB_ADD_CONSTANT(SHPT_POLYGON);
        PYSHAPELIB_ADD_CONSTANT(SHPT_MULTIPOINT);
        PYSHAPELIB_ADD_CONSTANT(SHPT_POINTZ);
        PYSHAPELIB_ADD_CONSTANT(SHPT_ARCZ);
        PYSHAPELIB_ADD_CONSTANT(SHPT_POLYGONZ);
        PYSHAPELIB_ADD_CONSTANT(SHPT_MULTIPOINTZ);
        PYSHAPELIB_ADD_CONSTANT(SHPT_POINTM);
        PYSHAPELIB_ADD_CONSTANT(SHPT_ARCM);
        PYSHAPELIB_ADD_CONSTANT(SHPT_POLYGONM);
        PYSHAPELIB_ADD_CONSTANT(SHPT_MULTIPOINTM);
        PYSHAPELIB_ADD_CONSTANT(SHPT_MULTIPATCH);
        PYSHAPELIB_ADD_CONSTANT(SHPP_TRISTRIP);
        PYSHAPELIB_ADD_CONSTANT(SHPP_TRIFAN);
        PYSHAPELIB_ADD_CONSTANT(SHPP_OUTERRING);
        PYSHAPELIB_ADD_CONSTANT(SHPP_INNERRING);
        PYSHAPELIB_ADD_CONSTANT(SHPP_FIRSTRING);
        PYSHAPELIB_ADD_CONSTANT(SHPP_RING);
}

1	#include "shapefil.h"
2	#include "pyshapelib_common.h"
3	#include "pyshapelib_api.h"
4
5	/* --- SHPObject ----------------------------------------------------------------------------------------------------- */
6
7	typedef struct
8	{
9	PyObject_HEAD
10	SHPObject* shpObject;
11	}
12	PySHPObject;
13
14	static PyObject* PySHPObject_new(PyTypeObject* type, PyObject* args, PyObject* kwds)
15	{
16	PySHPObject* self;
17	self = (PySHPObject*) type->tp_alloc(type, 0);
18	self->shpObject = NULL;
19	return (PyObject*) self;
20	}
21
22	static void PySHPObject_dealloc(PySHPObject* self)
23	{
24	SHPDestroyObject(self->shpObject);
25	self->shpObject = NULL;
26	self->ob_type->tp_free((PyObject*)self);
27	}
28
29	/* The constructor of SHPObject. parts is a list of lists of tuples
30	* describing the parts and their vertices just likethe output of the
31	* vertices() method. part_type_list is the list of part-types and may
32	* be NULL. For the meaning of the part-types and their default value
33	* see the Shaplib documentation.
34	*/
35	static int PySHPObject_init(PySHPObject* self, PyObject* args, PyObject* kwds)
36	{
37	int type;
38	int id;
39	PyObject* parts = NULL;
40	PyObject* part_type_list = NULL;
41
42	int num_parts;
43	int num_vertices;
44	int part_start;
45
46	double* xs = NULL;
47	double* ys = NULL;
48	int* part_starts = NULL;
49	int* part_types = NULL;
50
51	int i;
52	int return_code = -1;
53
54	/* first, unpack parameters */
55	if (kwds != NULL && PyDict_Size(kwds) > 0)
56	{
57	PyErr_Format(PyExc_TypeError, "shapelib.SHPObject.__init__ takes no keyword arguments");
58	return -1;
59	}
60	if (!PyArg_ParseTuple(args, "iiO\|O", &type, &id, &parts, &part_type_list)) return -1;
61
62	if (!PySequence_Check(parts))
63	{
64	PyErr_SetString(PyExc_TypeError, "parts is not a sequence");
65	return -1;
66	}
67	num_parts = PySequence_Length(parts);
68	if (num_parts < 0)
69	{
70	PyErr_SetString(PyExc_TypeError, "cannot determine length of parts");
71	return -1;
72	}
73
74	/* parts and part_types have to have the same lengths */
75	if (part_type_list)
76	{
77	if (!PySequence_Check(parts))
78	{
79	PyErr_SetString(PyExc_TypeError, "part_type_list is not a sequence");
80	return -1;
81	}
82	if (PySequence_Length(part_type_list) != num_parts)
83	{
84	PyErr_SetString(PyExc_TypeError, "parts and part_types have to have the same lengths");
85	return -1;
86	}
87	}
88
89	/* determine how many vertices there are altogether */
90	num_vertices = 0;
91	for (i = 0; i < num_parts; ++i)
92	{
93	PyObject* part = PySequence_ITEM(parts, i);
94	if (!PySequence_Check(part))
95	{
96	PyErr_SetString(PyExc_TypeError, "at least one item in parts is not a sequence");
97	Py_DECREF(part);
98	return -1;
99	}
100	num_vertices += PySequence_Length(part);
101	Py_DECREF(part);
102	}
103
104	/* allocate the memory for the various arrays and check for memory errors */
105	xs = malloc(num_vertices * sizeof(double));
106	ys = malloc(num_vertices * sizeof(double));
107	part_starts = malloc(num_parts * sizeof(int));
108	part_types = part_type_list ? malloc(num_parts * sizeof(int)) : 0;
109
110	if (!xs \|\| !ys \|\| !part_starts \|\| (part_type_list && !part_types))
111	{
112	PyErr_NoMemory();
113	goto exit;
114	}
115
116	/* convert the part types */
117	if (part_type_list)
118	{
119	for (i = 0; i < num_parts; i++)
120	{
121	PyObject* otype = PySequence_ITEM(part_type_list, i);
122	part_types[i] = PyInt_AsLong(otype);
123	Py_DECREF(otype);
124	if (part_types[i] < 0)
125	{
126	PyErr_SetString(PyExc_TypeError, "at least one item in part_type_list is not an integer or is negative");
127	goto exit;
128	}
129	}
130	}
131
132	/* convert the list of parts */
133	part_start = 0;
134	for (i = 0; i < num_parts; ++i)
135	{
136	int j, length;
137
138	PyObject* part = PySequence_ITEM(parts, i);
139	length = PySequence_Length(part);
140	part_starts[i] = part_start;
141
142	for (j = 0; j < length; ++j)
143	{
144	PyObject* vertex = PySequence_ITEM(part, j);
145	if (!PyArg_ParseTuple(vertex, "dd", xs + part_start + j, ys + part_start + j))
146	{
147	PyErr_SetString(PyExc_TypeError, "at least one part contains an vertex that's not a tuple of two doubles");
148	Py_DECREF(vertex);
149	Py_DECREF(part);
150	goto exit;
151	}
152	Py_DECREF(vertex);
153	}
154	Py_DECREF(part);
155	part_start += length;
156	}
157
158	self->shpObject = SHPCreateObject(type, id, num_parts, part_starts, part_types, num_vertices, xs, ys, NULL, NULL);
159	return_code = 0;
160
161	exit:
162	free(xs);
163	free(ys);
164	free(part_starts);
165	free(part_types);
166	return return_code;
167	}
168
169	/*
170	* The extents() method of SHPObject.
171	*
172	* Return the extents as a tuple of two 4-element lists with the min.
173	* and max. values of x, y, z, m.
174	*/
175	static PyObject* PySHPObject_extents(PySHPObject* self)
176	{
177	SHPObject* object = self->shpObject;
178	return Py_BuildValue("(dddd)(dddd)",
179	object->dfXMin, object->dfYMin, object->dfZMin, object->dfMMin,
180	object->dfXMax, object->dfYMax, object->dfZMax, object->dfMMax);
181	}
182
183
184	/*
185	* The vertices() method of SHPObject.
186	*
187	* Return the x and y coords of the vertices as a list of lists of
188	* tuples.
189	*/
190
191	static PyObject* build_vertex_list(SHPObject *object, int index, int length);
192
193	static PyObject* PySHPObject_vertices(PySHPObject* self)
194	{
195	PyObject *result = NULL;
196	PyObject *part = NULL;
197	int part_idx, vertex_idx;
198	int length = 0;
199	SHPObject* object = self->shpObject;
200
201	if (object->nParts > 0)
202	{
203	/* A multipart shape. Usual for SHPT_ARC and SHPT_POLYGON */
204
205	result = PyList_New(object->nParts);
206	if (!result)
207	return NULL;
208
209	for (part_idx = 0, vertex_idx = 0; part_idx < object->nParts;
210	part_idx++)
211	{
212	if (part_idx < object->nParts - 1)
213	length = (object->panPartStart[part_idx + 1]
214	- object->panPartStart[part_idx]);
215	else
216	length = object->nVertices - object->panPartStart[part_idx];
217
218	part = build_vertex_list(object, vertex_idx, length);
219	if (!part)
220	goto fail;
221
222	if (PyList_SetItem(result, part_idx, part) < 0)
223	goto fail;
224
225	vertex_idx += length;
226	}
227	}
228	else
229	{
230	/* only one part. usual for SHPT_POINT */
231	result = build_vertex_list(object, 0, object->nVertices);
232	}
233
234	return result;
235
236	fail:
237	Py_XDECREF(part);
238	Py_DECREF(result);
239	return NULL;
240	}
241
242
243	/* Return the length coordinates of the shape object starting at vertex
244	* index as a Python-list of tuples. Helper function for
245	* SHPObject_vertices.
246	*/
247	static PyObject* build_vertex_list(SHPObject *object, int index, int length)
248	{
249	int i;
250	PyObject * list;
251	PyObject * vertex = NULL;
252
253	list = PyList_New(length);
254	if (!list)
255	return NULL;
256
257	for (i = 0; i < length; i++, index++)
258	{
259	vertex = Py_BuildValue("dd", object->padfX[index],
260	object->padfY[index]);
261	if (!vertex)
262	goto fail;
263	if (PyList_SetItem(list, i, vertex) < 0)
264	goto fail;
265	}
266
267	return list;
268
269	fail:
270	Py_XDECREF(vertex);
271	Py_DECREF(list);
272	return NULL;
273	}
274
275	static PyObject* PySHPObject_type(PySHPObject* self, void* closure)
276	{
277	return PyInt_FromLong(self->shpObject->nSHPType);
278	}
279
280	static PyObject* PySHPObject_id(PySHPObject* self, void* closure)
281	{
282	return PyInt_FromLong(self->shpObject->nShapeId);
283	}
284
285	static PyMethodDef PySHPObject_methods[] =
286	{
287	{"extents", (PyCFunction)PySHPObject_extents, METH_NOARGS, NULL},
288	{"vertices", (PyCFunction)PySHPObject_vertices, METH_NOARGS, NULL},
289	{NULL}
290	};
291
292	static PyGetSetDef PySHPObject_getsetters[] =
293	{
294	{"type", (getter)PySHPObject_type, NULL, NULL },
295	{"id", (getter)PySHPObject_id, NULL, NULL },
296	{NULL}
297	};
298
299	static PyTypeObject PySHPObjectType = PYSHAPELIB_DEFINE_TYPE(PySHPObject, "shapelib.SHPObject", 0);
300
301
302	/* --- ShapeFile ----------------------------------------------------------------------------------------------------- */
303
304	typedef struct
305	{
306	PyObject_HEAD
307	SHPHandle handle;
308	}
309	PyShapeFile;
310
311	static PyObject* PyShapeFile_new(PyTypeObject* type, PyObject* args, PyObject* kwds)
312	{
313	PyShapeFile* self;
314	self = (PyShapeFile*) type->tp_alloc(type, 0);
315	self->handle = NULL;
316	return (PyObject*) self;
317	}
318
319	static int PyShapeFile_init(PyShapeFile* self, PyObject* args, PyObject* kwds)
320	{
321	char* file;
322	char* mode = "rb";
323	if (kwds != NULL && PyDict_Size(kwds) > 0)
324	{
325	PyErr_Format(PyExc_TypeError, "shapelib.ShapeFile.__init__ takes no keyword arguments");
326	return -1;
327	}
328	if (!PyArg_ParseTuple(args, "s\|s", &file, &mode)) return -1;
329
330	self->handle = SHPOpen(file, mode);
331	return self->handle ? 0 : -1;
332	}
333
334	static PyObject* PyShapeFile_close(PyShapeFile* self)
335	{
336	SHPClose(self->handle);
337	self->handle = NULL;
338	Py_RETURN_NONE;
339	}
340
341	static void PyShapeFile_dealloc(PyShapeFile* self)
342	{
343	PyShapeFile_close(self);
344	self->ob_type->tp_free((PyObject*)self);
345	}
346
347	static PyObject* PyShapeFile_info(PyShapeFile* self)
348	{
349	SHPHandle handle = self->handle;
350	return Py_BuildValue("ii(dddd)(dddd)",
351	handle->nRecords, handle->nShapeType,
352	handle->adBoundsMin[0], handle->adBoundsMin[1], handle->adBoundsMin[2], handle->adBoundsMin[3],
353	handle->adBoundsMax[0], handle->adBoundsMax[1], handle->adBoundsMax[2], handle->adBoundsMax[3]);
354	}
355
356	static PyObject* PyShapeFile_read_object(PyShapeFile* self, PyObject* args)
357	{
358	int index;
359	SHPObject* object;
360	PySHPObject* result;
361
362	if (!PyArg_ParseTuple(args, "i", &index)) return NULL;
363
364	object = SHPReadObject(self->handle, index);
365	if (!object)
366	{
367	PyErr_SetString(PyExc_RuntimeError, "failed to read object");
368	return NULL;
369	}
370
371	result = PyObject_New(PySHPObject, &PySHPObjectType);
372	if (!result)
373	{
374	return PyErr_NoMemory();
375	}
376
377	result->shpObject = object;
378	return (PyObject*) result;
379	}
380
381	static PyObject* PyShapeFile_write_object(PyShapeFile* self, PyObject* args)
382	{
383	int index, result;
384	PyObject* object;
385
386	if (!PyArg_ParseTuple(args, "iO", &index, &object)) return NULL;
387
388	if (!PyObject_IsInstance(object, (PyObject*)&PySHPObjectType))
389	{
390	PyErr_SetString(PyExc_TypeError, "object is not a SHPObject");
391	return NULL;
392	}
393
394	result = SHPWriteObject(self->handle, index, ((PySHPObject*)object)->shpObject);
395	if (result < 0)
396	{
397	PyErr_SetString(PyExc_RuntimeError, "failed to write object");
398	return NULL;
399	}
400	return PyInt_FromLong((long)result);
401	}
402
403	static PyObject* PyShapeFile_cobject(PyShapeFile* self)
404	{
405	return PyCObject_FromVoidPtr(self->handle, NULL);
406	}
407
408	static PyMethodDef PyShapeFile_methods[] =
409	{
410	{"close", (PyCFunction)PyShapeFile_close, METH_NOARGS, "close the shape file" },
411	{"info", (PyCFunction)PyShapeFile_info, METH_NOARGS,
412	"Return a tuple (NUM_SHAPES, TYPE, MIN, MAX) where NUM_SHAPES is the number of shapes in the file, TYPE is the "
413	"shape type and MIN and MAX are 4-element tuples with the min. and max. values of the data." },
414	{"read_object", (PyCFunction)PyShapeFile_read_object, METH_VARARGS, "Return object number i" },
415	{"write_object", (PyCFunction)PyShapeFile_write_object, METH_VARARGS, "Write an object"},
416	{"cobject", (PyCFunction)PyShapeFile_cobject, METH_NOARGS, "Return the shapelib SHPHandle as a Python CObject"},
417	{NULL}
418	};
419
420	static PyGetSetDef PyShapeFile_getsetters[] =
421	{
422	{NULL}
423	};
424
425	static PyTypeObject PyShapeFileType = PYSHAPELIB_DEFINE_TYPE(PyShapeFile, "shapelib.ShapeFile", 0);
426
427	/* --- shapelib ------------------------------------------------------------------------------------------------------ */
428
429	static PyObject* shapelib_open(PyObject* module, PyObject* args)
430	{
431	return PyObject_CallObject((PyObject*)&PyShapeFileType, args);
432	}
433
434	static PyObject* shapelib_create(PyObject* module, PyObject* args)
435	{
436	char* file;
437	int type;
438	PyShapeFile* result;
439
440	if (!PyArg_ParseTuple(args, "si", &file, &type)) return NULL;
441
442	result = PyObject_New(PyShapeFile, &PyShapeFileType);
443	if (!result)
444	{
445	return PyErr_NoMemory();
446	}
447
448	result->handle = SHPCreate(file, type);
449	if (!result->handle)
450	{
451	PyObject_Del((PyObject*)result);
452	PyErr_SetString(PyExc_RuntimeError, "Failed to create ShapeFile");
453	return NULL;
454	}
455
456	return (PyObject*) result;
457	}
458
459	static PyShapeLibAPI shapelib_the_api =
460	{
461	SHPReadObject,
462	SHPDestroyObject,
463	SHPCreateTree,
464	SHPDestroyTree,
465	SHPTreeFindLikelyShapes
466	};
467
468	static PyObject* shapelib_c_api(PyObject* module)
469	{
470	return PyCObject_FromVoidPtr(&shapelib_the_api, NULL);
471	}
472
473	static PyObject* shapelib_type_name(PyObject* module, PyObject* args)
474	{
475	int type;
476	if (!PyArg_ParseTuple(args, "i", &type)) return NULL;
477	return PyString_FromString(SHPTypeName(type));
478	}
479
480	static PyObject* shapelib_part_type_name(PyObject* module, PyObject* args)
481	{
482	int type;
483	if (!PyArg_ParseTuple(args, "i", &type)) return NULL;
484	return PyString_FromString(SHPPartTypeName(type));
485	}
486
487	static PyMethodDef shapelib_methods[] =
488	{
489	{"open", (PyCFunction)shapelib_open, METH_VARARGS, "open a ShapeFile" },
490	{"create", (PyCFunction)shapelib_create, METH_VARARGS, "create a ShapeFile" },
491	{"c_api", (PyCFunction)shapelib_c_api, METH_NOARGS, "get C API of shapelib" },
492	{"type_name", (PyCFunction)shapelib_type_name, METH_VARARGS, "return type as string" },
493	{"part_type_name", (PyCFunction)shapelib_part_type_name, METH_VARARGS, "return part type as string" },
494	{NULL}
495	};
496
497	PyMODINIT_FUNC initshapelib(void)
498	{
499	PyObject* module = Py_InitModule("shapelib", shapelib_methods);
500	if (!module) return;
501
502	PYSHAPELIB_ADD_TYPE(PySHPObjectType, "SHPObject");
503	PYSHAPELIB_ADD_TYPE(PyShapeFileType, "ShapeFile");
504
505	PYSHAPELIB_ADD_CONSTANT(SHPT_NULL);
506	PYSHAPELIB_ADD_CONSTANT(SHPT_POINT);
507	PYSHAPELIB_ADD_CONSTANT(SHPT_ARC);
508	PYSHAPELIB_ADD_CONSTANT(SHPT_POLYGON);
509	PYSHAPELIB_ADD_CONSTANT(SHPT_MULTIPOINT);
510	PYSHAPELIB_ADD_CONSTANT(SHPT_POINTZ);
511	PYSHAPELIB_ADD_CONSTANT(SHPT_ARCZ);
512	PYSHAPELIB_ADD_CONSTANT(SHPT_POLYGONZ);
513	PYSHAPELIB_ADD_CONSTANT(SHPT_MULTIPOINTZ);
514	PYSHAPELIB_ADD_CONSTANT(SHPT_POINTM);
515	PYSHAPELIB_ADD_CONSTANT(SHPT_ARCM);
516	PYSHAPELIB_ADD_CONSTANT(SHPT_POLYGONM);
517	PYSHAPELIB_ADD_CONSTANT(SHPT_MULTIPOINTM);
518	PYSHAPELIB_ADD_CONSTANT(SHPT_MULTIPATCH);
519	PYSHAPELIB_ADD_CONSTANT(SHPP_TRISTRIP);
520	PYSHAPELIB_ADD_CONSTANT(SHPP_TRIFAN);
521	PYSHAPELIB_ADD_CONSTANT(SHPP_OUTERRING);
522	PYSHAPELIB_ADD_CONSTANT(SHPP_INNERRING);
523	PYSHAPELIB_ADD_CONSTANT(SHPP_FIRSTRING);
524	PYSHAPELIB_ADD_CONSTANT(SHPP_RING);
525	}
526
Name	Value
svn:eol-style	native
svn:keywords	Author Date Id Revision