libraries/pyshapelib/shapelibmodule.c

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

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

typedef struct
{
        PyObject_HEAD
        SHPObject* shpObject;
}
PySHPObject;

/* allocator
 */
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;
}

/* deallocator
 */
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 == Py_None)
        {
                Py_DECREF(part_type_list);
                part_type_list = NULL;
        }
        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_part_types(PySHPObject* self)
{
        int i;
        PyObject* result = NULL;
        SHPObject* object = self->shpObject;
        
        if (object->nParts == 0 || object->panPartType == 0)
        {
                Py_RETURN_NONE;
        }
        
        result = PyTuple_New(object->nParts);
        if (!result) return NULL;
        
        for (i = 0; i < object->nParts; ++i)
        {
                /* PyTuple_SetItem steals a reference */
                PyObject* part_type = PyInt_FromLong((long)object->panPartType[i]);
                if (!part_type || PyTuple_SetItem(result, i, part_type) < 0) goto fail;
        }       
        return result;
        
fail:
        Py_DECREF(result);
        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);
}


/* return a string that can be feeded to eval() to reconstruct the object,
 * assuming a proper context
 */
static PyObject* PySHPObject_repr(PySHPObject* self)
{
        PyObject* format = NULL;
        PyObject* args = NULL;
        PyObject* result = NULL;
        
        format = PyString_FromString("shapelib.SHPObject(%i, %i, %s, %s)");
        if (!format) return NULL;

        args = Py_BuildValue("iiNN", 
                self->shpObject->nSHPType, 
                self->shpObject->nShapeId,
                PySHPObject_vertices(self), 
                PySHPObject_part_types(self));
        if (!args) 
        {
                Py_DECREF(format);
                return NULL;
        }
        
        result = PyString_Format(format, args);
        Py_DECREF(args);
        Py_DECREF(format);
        return result;
}


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

/* allocator 
 */
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;
}

/* constructor
 */
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;
}

/* destructor
 */
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 PyObject* PyShapeFile_repr(PyShapeFile* self)
{
        /* TODO: it would be nice to do something like "shapelib.ShapeFile(filename, mode)" instead */
        return PyString_FromFormat("<shapelib.ShapeFile object at %p>", self->handle);
}

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	/* allocator
15	*/
16	static PyObject* PySHPObject_new(PyTypeObject* type, PyObject* args, PyObject* kwds)
17	{
18	PySHPObject* self;
19	self = (PySHPObject*) type->tp_alloc(type, 0);
20	self->shpObject = NULL;
21	return (PyObject*) self;
22	}
23
24	/* deallocator
25	*/
26	static void PySHPObject_dealloc(PySHPObject* self)
27	{
28	SHPDestroyObject(self->shpObject);
29	self->shpObject = NULL;
30	self->ob_type->tp_free((PyObject*)self);
31	}
32
33	/* The constructor of SHPObject. parts is a list of lists of tuples
34	* describing the parts and their vertices just likethe output of the
35	* vertices() method. part_type_list is the list of part-types and may
36	* be NULL. For the meaning of the part-types and their default value
37	* see the Shaplib documentation.
38	*/
39	static int PySHPObject_init(PySHPObject* self, PyObject* args, PyObject* kwds)
40	{
41	int type;
42	int id;
43	PyObject* parts = NULL;
44	PyObject* part_type_list = NULL;
45
46	int num_parts;
47	int num_vertices;
48	int part_start;
49
50	double* xs = NULL;
51	double* ys = NULL;
52	int* part_starts = NULL;
53	int* part_types = NULL;
54
55	int i;
56	int return_code = -1;
57
58	/* first, unpack parameters */
59	if (kwds != NULL && PyDict_Size(kwds) > 0)
60	{
61	PyErr_Format(PyExc_TypeError, "shapelib.SHPObject.__init__ takes no keyword arguments");
62	return -1;
63	}
64	if (!PyArg_ParseTuple(args, "iiO\|O", &type, &id, &parts, &part_type_list)) return -1;
65
66	if (!PySequence_Check(parts))
67	{
68	PyErr_SetString(PyExc_TypeError, "parts is not a sequence");
69	return -1;
70	}
71	num_parts = PySequence_Length(parts);
72	if (num_parts < 0)
73	{
74	PyErr_SetString(PyExc_TypeError, "cannot determine length of parts");
75	return -1;
76	}
77
78	/* parts and part_types have to have the same lengths */
79	if (part_type_list == Py_None)
80	{
81	Py_DECREF(part_type_list);
82	part_type_list = NULL;
83	}
84	if (part_type_list)
85	{
86	if (!PySequence_Check(parts))
87	{
88	PyErr_SetString(PyExc_TypeError, "part_type_list is not a sequence");
89	return -1;
90	}
91	if (PySequence_Length(part_type_list) != num_parts)
92	{
93	PyErr_SetString(PyExc_TypeError, "parts and part_types have to have the same lengths");
94	return -1;
95	}
96	}
97
98	/* determine how many vertices there are altogether */
99	num_vertices = 0;
100	for (i = 0; i < num_parts; ++i)
101	{
102	PyObject* part = PySequence_ITEM(parts, i);
103	if (!PySequence_Check(part))
104	{
105	PyErr_SetString(PyExc_TypeError, "at least one item in parts is not a sequence");
106	Py_DECREF(part);
107	return -1;
108	}
109	num_vertices += PySequence_Length(part);
110	Py_DECREF(part);
111	}
112
113	/* allocate the memory for the various arrays and check for memory errors */
114	xs = malloc(num_vertices * sizeof(double));
115	ys = malloc(num_vertices * sizeof(double));
116	part_starts = malloc(num_parts * sizeof(int));
117	part_types = part_type_list ? malloc(num_parts * sizeof(int)) : 0;
118
119	if (!xs \|\| !ys \|\| !part_starts \|\| (part_type_list && !part_types))
120	{
121	PyErr_NoMemory();
122	goto exit;
123	}
124
125	/* convert the part types */
126	if (part_type_list)
127	{
128	for (i = 0; i < num_parts; i++)
129	{
130	PyObject* otype = PySequence_ITEM(part_type_list, i);
131	part_types[i] = PyInt_AsLong(otype);
132	Py_DECREF(otype);
133	if (part_types[i] < 0)
134	{
135	PyErr_SetString(PyExc_TypeError, "at least one item in part_type_list is not an integer or is negative");
136	goto exit;
137	}
138	}
139	}
140
141	/* convert the list of parts */
142	part_start = 0;
143	for (i = 0; i < num_parts; ++i)
144	{
145	int j, length;
146
147	PyObject* part = PySequence_ITEM(parts, i);
148	length = PySequence_Length(part);
149	part_starts[i] = part_start;
150
151	for (j = 0; j < length; ++j)
152	{
153	PyObject* vertex = PySequence_ITEM(part, j);
154	if (!PyArg_ParseTuple(vertex, "dd", xs + part_start + j, ys + part_start + j))
155	{
156	PyErr_SetString(PyExc_TypeError, "at least one part contains an vertex that's not a tuple of two doubles");
157	Py_DECREF(vertex);
158	Py_DECREF(part);
159	goto exit;
160	}
161	Py_DECREF(vertex);
162	}
163	Py_DECREF(part);
164	part_start += length;
165	}
166
167	self->shpObject = SHPCreateObject(type, id, num_parts, part_starts, part_types, num_vertices, xs, ys, NULL, NULL);
168	return_code = 0;
169
170	exit:
171	free(xs);
172	free(ys);
173	free(part_starts);
174	free(part_types);
175	return return_code;
176	}
177
178	/*
179	* The extents() method of SHPObject.
180	*
181	* Return the extents as a tuple of two 4-element lists with the min.
182	* and max. values of x, y, z, m.
183	*/
184	static PyObject* PySHPObject_extents(PySHPObject* self)
185	{
186	SHPObject* object = self->shpObject;
187	return Py_BuildValue("(dddd)(dddd)",
188	object->dfXMin, object->dfYMin, object->dfZMin, object->dfMMin,
189	object->dfXMax, object->dfYMax, object->dfZMax, object->dfMMax);
190	}
191
192
193	/*
194	* The vertices() method of SHPObject.
195	*
196	* Return the x and y coords of the vertices as a list of lists of
197	* tuples.
198	*/
199
200	static PyObject* build_vertex_list(SHPObject *object, int index, int length);
201
202	static PyObject* PySHPObject_vertices(PySHPObject* self)
203	{
204	PyObject *result = NULL;
205	PyObject *part = NULL;
206	int part_idx, vertex_idx;
207	int length = 0;
208	SHPObject* object = self->shpObject;
209
210	if (object->nParts > 0)
211	{
212	/* A multipart shape. Usual for SHPT_ARC and SHPT_POLYGON */
213
214	result = PyList_New(object->nParts);
215	if (!result)
216	return NULL;
217
218	for (part_idx = 0, vertex_idx = 0; part_idx < object->nParts; part_idx++)
219	{
220	if (part_idx < object->nParts - 1)
221	length = (object->panPartStart[part_idx + 1]
222	- object->panPartStart[part_idx]);
223	else
224	length = object->nVertices - object->panPartStart[part_idx];
225
226	part = build_vertex_list(object, vertex_idx, length);
227	if (!part)
228	goto fail;
229
230	if (PyList_SetItem(result, part_idx, part) < 0)
231	goto fail;
232
233	vertex_idx += length;
234	}
235	}
236	else
237	{
238	/* only one part. usual for SHPT_POINT */
239	result = build_vertex_list(object, 0, object->nVertices);
240	}
241
242	return result;
243
244	fail:
245	Py_XDECREF(part);
246	Py_DECREF(result);
247	return NULL;
248	}
249
250
251	/* Return the length coordinates of the shape object starting at vertex
252	* index as a Python-list of tuples. Helper function for
253	* SHPObject_vertices.
254	*/
255	static PyObject* build_vertex_list(SHPObject *object, int index, int length)
256	{
257	int i;
258	PyObject * list;
259	PyObject * vertex = NULL;
260
261	list = PyList_New(length);
262	if (!list)
263	return NULL;
264
265	for (i = 0; i < length; i++, index++)
266	{
267	vertex = Py_BuildValue("dd", object->padfX[index],
268	object->padfY[index]);
269	if (!vertex)
270	goto fail;
271	if (PyList_SetItem(list, i, vertex) < 0)
272	goto fail;
273	}
274
275	return list;
276
277	fail:
278	Py_XDECREF(vertex);
279	Py_DECREF(list);
280	return NULL;
281	}
282
283
284
285	static PyObject* PySHPObject_part_types(PySHPObject* self)
286	{
287	int i;
288	PyObject* result = NULL;
289	SHPObject* object = self->shpObject;
290
291	if (object->nParts == 0 \|\| object->panPartType == 0)
292	{
293	Py_RETURN_NONE;
294	}
295
296	result = PyTuple_New(object->nParts);
297	if (!result) return NULL;
298
299	for (i = 0; i < object->nParts; ++i)
300	{
301	/* PyTuple_SetItem steals a reference */
302	PyObject* part_type = PyInt_FromLong((long)object->panPartType[i]);
303	if (!part_type \|\| PyTuple_SetItem(result, i, part_type) < 0) goto fail;
304	}
305	return result;
306
307	fail:
308	Py_DECREF(result);
309	return NULL;
310	}
311
312
313
314	static PyObject* PySHPObject_type(PySHPObject* self, void* closure)
315	{
316	return PyInt_FromLong(self->shpObject->nSHPType);
317	}
318
319
320
321	static PyObject* PySHPObject_id(PySHPObject* self, void* closure)
322	{
323	return PyInt_FromLong(self->shpObject->nShapeId);
324	}
325
326
327
328	/* return a string that can be feeded to eval() to reconstruct the object,
329	* assuming a proper context
330	*/
331	static PyObject* PySHPObject_repr(PySHPObject* self)
332	{
333	PyObject* format = NULL;
334	PyObject* args = NULL;
335	PyObject* result = NULL;
336
337	format = PyString_FromString("shapelib.SHPObject(%i, %i, %s, %s)");
338	if (!format) return NULL;
339
340	args = Py_BuildValue("iiNN",
341	self->shpObject->nSHPType,
342	self->shpObject->nShapeId,
343	PySHPObject_vertices(self),
344	PySHPObject_part_types(self));
345	if (!args)
346	{
347	Py_DECREF(format);
348	return NULL;
349	}
350
351	result = PyString_Format(format, args);
352	Py_DECREF(args);
353	Py_DECREF(format);
354	return result;
355	}
356
357
358
359	static PyMethodDef PySHPObject_methods[] =
360	{
361	{"extents", (PyCFunction)PySHPObject_extents, METH_NOARGS, NULL},
362	{"vertices", (PyCFunction)PySHPObject_vertices, METH_NOARGS, NULL},
363	{"part_types", (PyCFunction)PySHPObject_part_types, METH_NOARGS, NULL},
364	{NULL}
365	};
366
367	static PyGetSetDef PySHPObject_getsetters[] =
368	{
369	{"type", (getter)PySHPObject_type, NULL, NULL },
370	{"id", (getter)PySHPObject_id, NULL, NULL },
371	{NULL}
372	};
373
374	static PyTypeObject PySHPObjectType = PYSHAPELIB_DEFINE_TYPE(PySHPObject, "shapelib.SHPObject", 0);
375
376
377	/* --- ShapeFile ----------------------------------------------------------------------------------------------------- */
378
379	typedef struct
380	{
381	PyObject_HEAD
382	SHPHandle handle;
383	}
384	PyShapeFile;
385
386	/* allocator
387	*/
388	static PyObject* PyShapeFile_new(PyTypeObject* type, PyObject* args, PyObject* kwds)
389	{
390	PyShapeFile* self;
391	self = (PyShapeFile*) type->tp_alloc(type, 0);
392	self->handle = NULL;
393	return (PyObject*) self;
394	}
395
396	/* constructor
397	*/
398	static int PyShapeFile_init(PyShapeFile* self, PyObject* args, PyObject* kwds)
399	{
400	char* file;
401	char* mode = "rb";
402	if (kwds != NULL && PyDict_Size(kwds) > 0)
403	{
404	PyErr_Format(PyExc_TypeError, "shapelib.ShapeFile.__init__ takes no keyword arguments");
405	return -1;
406	}
407	if (!PyArg_ParseTuple(args, "s\|s", &file, &mode)) return -1;
408
409	self->handle = SHPOpen(file, mode);
410	return self->handle ? 0 : -1;
411	}
412
413	static PyObject* PyShapeFile_close(PyShapeFile* self)
414	{
415	SHPClose(self->handle);
416	self->handle = NULL;
417	Py_RETURN_NONE;
418	}
419
420	/* destructor
421	*/
422	static void PyShapeFile_dealloc(PyShapeFile* self)
423	{
424	PyShapeFile_close(self);
425	self->ob_type->tp_free((PyObject*)self);
426	}
427
428	static PyObject* PyShapeFile_info(PyShapeFile* self)
429	{
430	SHPHandle handle = self->handle;
431	return Py_BuildValue("ii(dddd)(dddd)",
432	handle->nRecords, handle->nShapeType,
433	handle->adBoundsMin[0], handle->adBoundsMin[1], handle->adBoundsMin[2], handle->adBoundsMin[3],
434	handle->adBoundsMax[0], handle->adBoundsMax[1], handle->adBoundsMax[2], handle->adBoundsMax[3]);
435	}
436
437	static PyObject* PyShapeFile_read_object(PyShapeFile* self, PyObject* args)
438	{
439	int index;
440	SHPObject* object;
441	PySHPObject* result;
442
443	if (!PyArg_ParseTuple(args, "i", &index)) return NULL;
444
445	object = SHPReadObject(self->handle, index);
446	if (!object)
447	{
448	PyErr_SetString(PyExc_RuntimeError, "failed to read object");
449	return NULL;
450	}
451
452	result = PyObject_New(PySHPObject, &PySHPObjectType);
453	if (!result)
454	{
455	return PyErr_NoMemory();
456	}
457
458	result->shpObject = object;
459	return (PyObject*) result;
460	}
461
462	static PyObject* PyShapeFile_write_object(PyShapeFile* self, PyObject* args)
463	{
464	int index, result;
465	PyObject* object;
466
467	if (!PyArg_ParseTuple(args, "iO", &index, &object)) return NULL;
468
469	if (!PyObject_IsInstance(object, (PyObject*)&PySHPObjectType))
470	{
471	PyErr_SetString(PyExc_TypeError, "object is not a SHPObject");
472	return NULL;
473	}
474
475	result = SHPWriteObject(self->handle, index, ((PySHPObject*)object)->shpObject);
476	if (result < 0)
477	{
478	PyErr_SetString(PyExc_RuntimeError, "failed to write object");
479	return NULL;
480	}
481	return PyInt_FromLong((long)result);
482	}
483
484	static PyObject* PyShapeFile_cobject(PyShapeFile* self)
485	{
486	return PyCObject_FromVoidPtr(self->handle, NULL);
487	}
488
489	static PyObject* PyShapeFile_repr(PyShapeFile* self)
490	{
491	/* TODO: it would be nice to do something like "shapelib.ShapeFile(filename, mode)" instead */
492	return PyString_FromFormat("<shapelib.ShapeFile object at %p>", self->handle);
493	}
494
495	static PyMethodDef PyShapeFile_methods[] =
496	{
497	{"close", (PyCFunction)PyShapeFile_close, METH_NOARGS, "close the shape file" },
498	{"info", (PyCFunction)PyShapeFile_info, METH_NOARGS,
499	"Return a tuple (NUM_SHAPES, TYPE, MIN, MAX) where NUM_SHAPES is the number of shapes in the file, TYPE is the "
500	"shape type and MIN and MAX are 4-element tuples with the min. and max. values of the data." },
501	{"read_object", (PyCFunction)PyShapeFile_read_object, METH_VARARGS, "Return object number i" },
502	{"write_object", (PyCFunction)PyShapeFile_write_object, METH_VARARGS, "Write an object"},
503	{"cobject", (PyCFunction)PyShapeFile_cobject, METH_NOARGS, "Return the shapelib SHPHandle as a Python CObject"},
504	{NULL}
505	};
506
507	static PyGetSetDef PyShapeFile_getsetters[] =
508	{
509	{NULL}
510	};
511
512	static PyTypeObject PyShapeFileType = PYSHAPELIB_DEFINE_TYPE(PyShapeFile, "shapelib.ShapeFile", 0);
513
514	/* --- shapelib ------------------------------------------------------------------------------------------------------ */
515
516	static PyObject* shapelib_open(PyObject* module, PyObject* args)
517	{
518	return PyObject_CallObject((PyObject*)&PyShapeFileType, args);
519	}
520
521	static PyObject* shapelib_create(PyObject* module, PyObject* args)
522	{
523	char* file;
524	int type;
525	PyShapeFile* result;
526
527	if (!PyArg_ParseTuple(args, "si", &file, &type)) return NULL;
528
529	result = PyObject_New(PyShapeFile, &PyShapeFileType);
530	if (!result)
531	{
532	return PyErr_NoMemory();
533	}
534
535	result->handle = SHPCreate(file, type);
536	if (!result->handle)
537	{
538	PyObject_Del((PyObject*)result);
539	PyErr_SetString(PyExc_RuntimeError, "Failed to create ShapeFile");
540	return NULL;
541	}
542
543	return (PyObject*) result;
544	}
545
546	static PyShapeLibAPI shapelib_the_api =
547	{
548	SHPReadObject,
549	SHPDestroyObject,
550	SHPCreateTree,
551	SHPDestroyTree,
552	SHPTreeFindLikelyShapes
553	};
554
555	static PyObject* shapelib_c_api(PyObject* module)
556	{
557	return PyCObject_FromVoidPtr(&shapelib_the_api, NULL);
558	}
559
560	static PyObject* shapelib_type_name(PyObject* module, PyObject* args)
561	{
562	int type;
563	if (!PyArg_ParseTuple(args, "i", &type)) return NULL;
564	return PyString_FromString(SHPTypeName(type));
565	}
566
567	static PyObject* shapelib_part_type_name(PyObject* module, PyObject* args)
568	{
569	int type;
570	if (!PyArg_ParseTuple(args, "i", &type)) return NULL;
571	return PyString_FromString(SHPPartTypeName(type));
572	}
573
574	static PyMethodDef shapelib_methods[] =
575	{
576	{"open", (PyCFunction)shapelib_open, METH_VARARGS, "open a ShapeFile" },
577	{"create", (PyCFunction)shapelib_create, METH_VARARGS, "create a ShapeFile" },
578	{"c_api", (PyCFunction)shapelib_c_api, METH_NOARGS, "get C API of shapelib" },
579	{"type_name", (PyCFunction)shapelib_type_name, METH_VARARGS, "return type as string" },
580	{"part_type_name", (PyCFunction)shapelib_part_type_name, METH_VARARGS, "return part type as string" },
581	{NULL}
582	};
583
584	PyMODINIT_FUNC initshapelib(void)
585	{
586	PyObject* module = Py_InitModule("shapelib", shapelib_methods);
587	if (!module) return;
588
589	PYSHAPELIB_ADD_TYPE(PySHPObjectType, "SHPObject");
590	PYSHAPELIB_ADD_TYPE(PyShapeFileType, "ShapeFile");
591
592	PYSHAPELIB_ADD_CONSTANT(SHPT_NULL);
593	PYSHAPELIB_ADD_CONSTANT(SHPT_POINT);
594	PYSHAPELIB_ADD_CONSTANT(SHPT_ARC);
595	PYSHAPELIB_ADD_CONSTANT(SHPT_POLYGON);
596	PYSHAPELIB_ADD_CONSTANT(SHPT_MULTIPOINT);
597	PYSHAPELIB_ADD_CONSTANT(SHPT_POINTZ);
598	PYSHAPELIB_ADD_CONSTANT(SHPT_ARCZ);
599	PYSHAPELIB_ADD_CONSTANT(SHPT_POLYGONZ);
600	PYSHAPELIB_ADD_CONSTANT(SHPT_MULTIPOINTZ);
601	PYSHAPELIB_ADD_CONSTANT(SHPT_POINTM);
602	PYSHAPELIB_ADD_CONSTANT(SHPT_ARCM);
603	PYSHAPELIB_ADD_CONSTANT(SHPT_POLYGONM);
604	PYSHAPELIB_ADD_CONSTANT(SHPT_MULTIPOINTM);
605	PYSHAPELIB_ADD_CONSTANT(SHPT_MULTIPATCH);
606	PYSHAPELIB_ADD_CONSTANT(SHPP_TRISTRIP);
607	PYSHAPELIB_ADD_CONSTANT(SHPP_TRIFAN);
608	PYSHAPELIB_ADD_CONSTANT(SHPP_OUTERRING);
609	PYSHAPELIB_ADD_CONSTANT(SHPP_INNERRING);
610	PYSHAPELIB_ADD_CONSTANT(SHPP_FIRSTRING);
611	PYSHAPELIB_ADD_CONSTANT(SHPP_RING);
612	}
613
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svn:keywords	Author Date Id Revision