libraries/pyshapelib/shapelibmodule.c

#include "pyshapelib_common.h"

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

typedef struct
{
        PyObject_HEAD
        SHPObject* shpObject;
}
SHPObjectObject;

/* allocator
 */
static PyObject* shpobject_new(PyTypeObject* type, PyObject* args, PyObject* kwds)
{
        SHPObjectObject* self;  
        self = (SHPObjectObject*) type->tp_alloc(type, 0);
        self->shpObject = NULL;
        return (PyObject*) self;
}

/* deallocator
 */
static void shpobject_dealloc(SHPObjectObject* 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 shpobject_init(SHPObjectObject* 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* shpobject_extents(SHPObjectObject* 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* shpobject_vertices(SHPObjectObject* 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* shpobject_part_types(SHPObjectObject* 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* shpobject_type(SHPObjectObject* self, void* closure)
{
        return PyInt_FromLong(self->shpObject->nSHPType);
}


static PyObject* shpobject_id(SHPObjectObject* 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* shpobject_repr(SHPObjectObject* 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,
                shpobject_vertices(self), 
                shpobject_part_types(self));
        if (!args) 
        {
                Py_DECREF(format);
                return NULL;
        }
        
        result = PyString_Format(format, args);
        Py_DECREF(args);
        Py_DECREF(format);
        return result;
}


static struct PyMethodDef shpobject_methods[] = 
{
        {"extents", (PyCFunction)shpobject_extents, METH_NOARGS, NULL},
        {"vertices", (PyCFunction)shpobject_vertices, METH_NOARGS, NULL},
        {"part_types", (PyCFunction)shpobject_part_types, METH_NOARGS, NULL},
        {NULL}
};

static struct PyGetSetDef shpobject_getsetters[] = 
{
        {"type", (getter)shpobject_type, NULL, NULL },
        {"id", (getter)shpobject_id, NULL, NULL },
        {NULL}
};

static PyTypeObject SHPObjectType = PYSHAPELIB_DEFINE_TYPE(SHPObjectObject, shpobject, "shapelib.SHPObject", 0);


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

typedef struct
{
        PyObject_HEAD
        SHPHandle handle;
}
ShapeFileObject;

/* allocator 
 */
static PyObject* shapefile_new(PyTypeObject* type, PyObject* args, PyObject* kwds)
{
        ShapeFileObject* self;  
        self = (ShapeFileObject*) type->tp_alloc(type, 0);
        self->handle = NULL;
        return (PyObject*) self;
}

/* destructor
*/
static void shapefile_dealloc(ShapeFileObject* self)
{
        SHPClose(self->handle);
        self->ob_type->tp_free((PyObject*)self);
}

/* constructor
 */
static int shapefile_init(ShapeFileObject* 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* shapefile_close(ShapeFileObject* self)
{
        SHPClose(self->handle);
        self->handle = NULL;
        Py_RETURN_NONE;
}

static PyObject* shapefile_info(ShapeFileObject* 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* shapefile_read_object(ShapeFileObject* self, PyObject* args)
{
        int index;
        SHPObject* object;
        SHPObjectObject* 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(SHPObjectObject, &SHPObjectType);
        if (!result)
        {
                return PyErr_NoMemory();
        }
        
        result->shpObject = object;
        return (PyObject*) result;
}

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

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

static PyObject* shapefile_repr(ShapeFileObject* 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 struct PyMethodDef shapefile_methods[] = 
{
        {"close", (PyCFunction)shapefile_close, METH_NOARGS, "close the shape file" },
        {"info", (PyCFunction)shapefile_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)shapefile_read_object, METH_VARARGS, "Return object number i" },
        {"write_object", (PyCFunction)shapefile_write_object, METH_VARARGS, "Write an object"},
        {"cobject", (PyCFunction)shapefile_cobject, METH_NOARGS, "Return the shapelib SHPHandle as a Python CObject"},
        {NULL}
};

static struct PyGetSetDef shapefile_getsetters[] = 
{
        {NULL}
};

static PyTypeObject ShapeFileType = PYSHAPELIB_DEFINE_TYPE(ShapeFileObject, shapefile, "shapelib.ShapeFile", 0);

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

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

static PyObject* shapelib_create(PyObject* module, PyObject* args)
{
        char* file;
        int type;
        ShapeFileObject* result;
        
        if (!PyArg_ParseTuple(args, "si", &file, &type)) return NULL;
        
        result = PyObject_New(ShapeFileObject, &ShapeFileType);
        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 struct 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(SHPObjectType, "SHPObject");
        PYSHAPELIB_ADD_TYPE(ShapeFileType, "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 "pyshapelib_common.h"
2
3	/* --- SHPObject ----------------------------------------------------------------------------------------------------- */
4
5	typedef struct
6	{
7	PyObject_HEAD
8	SHPObject* shpObject;
9	}
10	SHPObjectObject;
11
12	/* allocator
13	*/
14	static PyObject* shpobject_new(PyTypeObject* type, PyObject* args, PyObject* kwds)
15	{
16	SHPObjectObject* self;
17	self = (SHPObjectObject*) type->tp_alloc(type, 0);
18	self->shpObject = NULL;
19	return (PyObject*) self;
20	}
21
22	/* deallocator
23	*/
24	static void shpobject_dealloc(SHPObjectObject* self)
25	{
26	SHPDestroyObject(self->shpObject);
27	self->shpObject = NULL;
28	self->ob_type->tp_free((PyObject*)self);
29	}
30
31	/* The constructor of SHPObject. parts is a list of lists of tuples
32	* describing the parts and their vertices just likethe output of the
33	* vertices() method. part_type_list is the list of part-types and may
34	* be NULL. For the meaning of the part-types and their default value
35	* see the Shaplib documentation.
36	*/
37	static int shpobject_init(SHPObjectObject* self, PyObject* args, PyObject* kwds)
38	{
39	int type;
40	int id;
41	PyObject* parts = NULL;
42	PyObject* part_type_list = NULL;
43
44	int num_parts;
45	int num_vertices;
46	int part_start;
47
48	double* xs = NULL;
49	double* ys = NULL;
50	int* part_starts = NULL;
51	int* part_types = NULL;
52
53	int i;
54	int return_code = -1;
55
56	/* first, unpack parameters */
57	if (kwds != NULL && PyDict_Size(kwds) > 0)
58	{
59	PyErr_Format(PyExc_TypeError, "shapelib.SHPObject.__init__ takes no keyword arguments");
60	return -1;
61	}
62	if (!PyArg_ParseTuple(args, "iiO\|O", &type, &id, &parts, &part_type_list)) return -1;
63
64	if (!PySequence_Check(parts))
65	{
66	PyErr_SetString(PyExc_TypeError, "parts is not a sequence");
67	return -1;
68	}
69	num_parts = PySequence_Length(parts);
70	if (num_parts < 0)
71	{
72	PyErr_SetString(PyExc_TypeError, "cannot determine length of parts");
73	return -1;
74	}
75
76	/* parts and part_types have to have the same lengths */
77	if (part_type_list == Py_None)
78	{
79	Py_DECREF(part_type_list);
80	part_type_list = NULL;
81	}
82	if (part_type_list)
83	{
84	if (!PySequence_Check(parts))
85	{
86	PyErr_SetString(PyExc_TypeError, "part_type_list is not a sequence");
87	return -1;
88	}
89	if (PySequence_Length(part_type_list) != num_parts)
90	{
91	PyErr_SetString(PyExc_TypeError, "parts and part_types have to have the same lengths");
92	return -1;
93	}
94	}
95
96	/* determine how many vertices there are altogether */
97	num_vertices = 0;
98	for (i = 0; i < num_parts; ++i)
99	{
100	PyObject* part = PySequence_ITEM(parts, i);
101	if (!PySequence_Check(part))
102	{
103	PyErr_SetString(PyExc_TypeError, "at least one item in parts is not a sequence");
104	Py_DECREF(part);
105	return -1;
106	}
107	num_vertices += PySequence_Length(part);
108	Py_DECREF(part);
109	}
110
111	/* allocate the memory for the various arrays and check for memory errors */
112	xs = malloc(num_vertices * sizeof(double));
113	ys = malloc(num_vertices * sizeof(double));
114	part_starts = malloc(num_parts * sizeof(int));
115	part_types = part_type_list ? malloc(num_parts * sizeof(int)) : 0;
116
117	if (!xs \|\| !ys \|\| !part_starts \|\| (part_type_list && !part_types))
118	{
119	PyErr_NoMemory();
120	goto exit;
121	}
122
123	/* convert the part types */
124	if (part_type_list)
125	{
126	for (i = 0; i < num_parts; i++)
127	{
128	PyObject* otype = PySequence_ITEM(part_type_list, i);
129	part_types[i] = PyInt_AsLong(otype);
130	Py_DECREF(otype);
131	if (part_types[i] < 0)
132	{
133	PyErr_SetString(PyExc_TypeError, "at least one item in part_type_list is not an integer or is negative");
134	goto exit;
135	}
136	}
137	}
138
139	/* convert the list of parts */
140	part_start = 0;
141	for (i = 0; i < num_parts; ++i)
142	{
143	int j, length;
144
145	PyObject* part = PySequence_ITEM(parts, i);
146	length = PySequence_Length(part);
147	part_starts[i] = part_start;
148
149	for (j = 0; j < length; ++j)
150	{
151	PyObject* vertex = PySequence_ITEM(part, j);
152	if (!PyArg_ParseTuple(vertex, "dd", xs + part_start + j, ys + part_start + j))
153	{
154	PyErr_SetString(PyExc_TypeError, "at least one part contains an vertex that's not a tuple of two doubles");
155	Py_DECREF(vertex);
156	Py_DECREF(part);
157	goto exit;
158	}
159	Py_DECREF(vertex);
160	}
161	Py_DECREF(part);
162	part_start += length;
163	}
164
165	self->shpObject = SHPCreateObject(type, id, num_parts, part_starts, part_types, num_vertices, xs, ys, NULL, NULL);
166	return_code = 0;
167
168	exit:
169	free(xs);
170	free(ys);
171	free(part_starts);
172	free(part_types);
173	return return_code;
174	}
175
176	/*
177	* The extents() method of SHPObject.
178	*
179	* Return the extents as a tuple of two 4-element lists with the min.
180	* and max. values of x, y, z, m.
181	*/
182	static PyObject* shpobject_extents(SHPObjectObject* self)
183	{
184	SHPObject* object = self->shpObject;
185	return Py_BuildValue("(dddd)(dddd)",
186	object->dfXMin, object->dfYMin, object->dfZMin, object->dfMMin,
187	object->dfXMax, object->dfYMax, object->dfZMax, object->dfMMax);
188	}
189
190
191	/*
192	* The vertices() method of SHPObject.
193	*
194	* Return the x and y coords of the vertices as a list of lists of
195	* tuples.
196	*/
197
198	static PyObject* build_vertex_list(SHPObject *object, int index, int length);
199
200	static PyObject* shpobject_vertices(SHPObjectObject* self)
201	{
202	PyObject *result = NULL;
203	PyObject *part = NULL;
204	int part_idx, vertex_idx;
205	int length = 0;
206	SHPObject* object = self->shpObject;
207
208	if (object->nParts > 0)
209	{
210	/* A multipart shape. Usual for SHPT_ARC and SHPT_POLYGON */
211
212	result = PyList_New(object->nParts);
213	if (!result)
214	return NULL;
215
216	for (part_idx = 0, vertex_idx = 0; part_idx < object->nParts; part_idx++)
217	{
218	if (part_idx < object->nParts - 1)
219	length = (object->panPartStart[part_idx + 1]
220	- object->panPartStart[part_idx]);
221	else
222	length = object->nVertices - object->panPartStart[part_idx];
223
224	part = build_vertex_list(object, vertex_idx, length);
225	if (!part)
226	goto fail;
227
228	if (PyList_SetItem(result, part_idx, part) < 0)
229	goto fail;
230
231	vertex_idx += length;
232	}
233	}
234	else
235	{
236	/* only one part. usual for SHPT_POINT */
237	result = build_vertex_list(object, 0, object->nVertices);
238	}
239
240	return result;
241
242	fail:
243	Py_XDECREF(part);
244	Py_DECREF(result);
245	return NULL;
246	}
247
248
249	/* Return the length coordinates of the shape object starting at vertex
250	* index as a Python-list of tuples. Helper function for
251	* SHPObject_vertices.
252	*/
253	static PyObject* build_vertex_list(SHPObject *object, int index, int length)
254	{
255	int i;
256	PyObject * list;
257	PyObject * vertex = NULL;
258
259	list = PyList_New(length);
260	if (!list)
261	return NULL;
262
263	for (i = 0; i < length; i++, index++)
264	{
265	vertex = Py_BuildValue("dd", object->padfX[index],
266	object->padfY[index]);
267	if (!vertex)
268	goto fail;
269	if (PyList_SetItem(list, i, vertex) < 0)
270	goto fail;
271	}
272
273	return list;
274
275	fail:
276	Py_XDECREF(vertex);
277	Py_DECREF(list);
278	return NULL;
279	}
280
281
282
283	static PyObject* shpobject_part_types(SHPObjectObject* self)
284	{
285	int i;
286	PyObject* result = NULL;
287	SHPObject* object = self->shpObject;
288
289	if (object->nParts == 0 \|\| object->panPartType == 0)
290	{
291	Py_RETURN_NONE;
292	}
293
294	result = PyTuple_New(object->nParts);
295	if (!result) return NULL;
296
297	for (i = 0; i < object->nParts; ++i)
298	{
299	/* PyTuple_SetItem steals a reference */
300	PyObject* part_type = PyInt_FromLong((long)object->panPartType[i]);
301	if (!part_type \|\| PyTuple_SetItem(result, i, part_type) < 0) goto fail;
302	}
303	return result;
304
305	fail:
306	Py_DECREF(result);
307	return NULL;
308	}
309
310
311
312	static PyObject* shpobject_type(SHPObjectObject* self, void* closure)
313	{
314	return PyInt_FromLong(self->shpObject->nSHPType);
315	}
316
317
318
319	static PyObject* shpobject_id(SHPObjectObject* self, void* closure)
320	{
321	return PyInt_FromLong(self->shpObject->nShapeId);
322	}
323
324
325
326	/* return a string that can be feeded to eval() to reconstruct the object,
327	* assuming a proper context
328	*/
329	static PyObject* shpobject_repr(SHPObjectObject* self)
330	{
331	PyObject* format = NULL;
332	PyObject* args = NULL;
333	PyObject* result = NULL;
334
335	format = PyString_FromString("shapelib.SHPObject(%i, %i, %s, %s)");
336	if (!format) return NULL;
337
338	args = Py_BuildValue("iiNN",
339	self->shpObject->nSHPType,
340	self->shpObject->nShapeId,
341	shpobject_vertices(self),
342	shpobject_part_types(self));
343	if (!args)
344	{
345	Py_DECREF(format);
346	return NULL;
347	}
348
349	result = PyString_Format(format, args);
350	Py_DECREF(args);
351	Py_DECREF(format);
352	return result;
353	}
354
355
356
357	static struct PyMethodDef shpobject_methods[] =
358	{
359	{"extents", (PyCFunction)shpobject_extents, METH_NOARGS, NULL},
360	{"vertices", (PyCFunction)shpobject_vertices, METH_NOARGS, NULL},
361	{"part_types", (PyCFunction)shpobject_part_types, METH_NOARGS, NULL},
362	{NULL}
363	};
364
365	static struct PyGetSetDef shpobject_getsetters[] =
366	{
367	{"type", (getter)shpobject_type, NULL, NULL },
368	{"id", (getter)shpobject_id, NULL, NULL },
369	{NULL}
370	};
371
372	static PyTypeObject SHPObjectType = PYSHAPELIB_DEFINE_TYPE(SHPObjectObject, shpobject, "shapelib.SHPObject", 0);
373
374
375	/* --- ShapeFile ----------------------------------------------------------------------------------------------------- */
376
377	typedef struct
378	{
379	PyObject_HEAD
380	SHPHandle handle;
381	}
382	ShapeFileObject;
383
384	/* allocator
385	*/
386	static PyObject* shapefile_new(PyTypeObject* type, PyObject* args, PyObject* kwds)
387	{
388	ShapeFileObject* self;
389	self = (ShapeFileObject*) type->tp_alloc(type, 0);
390	self->handle = NULL;
391	return (PyObject*) self;
392	}
393
394	/* destructor
395	*/
396	static void shapefile_dealloc(ShapeFileObject* self)
397	{
398	SHPClose(self->handle);
399	self->ob_type->tp_free((PyObject*)self);
400	}
401
402	/* constructor
403	*/
404	static int shapefile_init(ShapeFileObject* self, PyObject* args, PyObject* kwds)
405	{
406	char* file;
407	char* mode = "rb";
408	if (kwds != NULL && PyDict_Size(kwds) > 0)
409	{
410	PyErr_Format(PyExc_TypeError, "shapelib.ShapeFile.__init__ takes no keyword arguments");
411	return -1;
412	}
413	if (!PyArg_ParseTuple(args, "s\|s", &file, &mode)) return -1;
414
415	self->handle = SHPOpen(file, mode);
416	return self->handle ? 0 : -1;
417	}
418
419	static PyObject* shapefile_close(ShapeFileObject* self)
420	{
421	SHPClose(self->handle);
422	self->handle = NULL;
423	Py_RETURN_NONE;
424	}
425
426	static PyObject* shapefile_info(ShapeFileObject* self)
427	{
428	SHPHandle handle = self->handle;
429	return Py_BuildValue("ii(dddd)(dddd)",
430	handle->nRecords, handle->nShapeType,
431	handle->adBoundsMin[0], handle->adBoundsMin[1], handle->adBoundsMin[2], handle->adBoundsMin[3],
432	handle->adBoundsMax[0], handle->adBoundsMax[1], handle->adBoundsMax[2], handle->adBoundsMax[3]);
433	}
434
435	static PyObject* shapefile_read_object(ShapeFileObject* self, PyObject* args)
436	{
437	int index;
438	SHPObject* object;
439	SHPObjectObject* result;
440
441	if (!PyArg_ParseTuple(args, "i", &index)) return NULL;
442
443	object = SHPReadObject(self->handle, index);
444	if (!object)
445	{
446	PyErr_SetString(PyExc_RuntimeError, "failed to read object");
447	return NULL;
448	}
449
450	result = PyObject_New(SHPObjectObject, &SHPObjectType);
451	if (!result)
452	{
453	return PyErr_NoMemory();
454	}
455
456	result->shpObject = object;
457	return (PyObject*) result;
458	}
459
460	static PyObject* shapefile_write_object(ShapeFileObject* self, PyObject* args)
461	{
462	int index, result;
463	PyObject* object;
464
465	if (!PyArg_ParseTuple(args, "iO", &index, &object)) return NULL;
466
467	if (!PyObject_IsInstance(object, (PyObject*)&SHPObjectType))
468	{
469	PyErr_SetString(PyExc_TypeError, "object is not a SHPObject");
470	return NULL;
471	}
472
473	result = SHPWriteObject(self->handle, index, ((SHPObjectObject*)object)->shpObject);
474	if (result < 0)
475	{
476	PyErr_SetString(PyExc_RuntimeError, "failed to write object");
477	return NULL;
478	}
479	return PyInt_FromLong((long)result);
480	}
481
482	static PyObject* shapefile_cobject(ShapeFileObject* self)
483	{
484	return PyCObject_FromVoidPtr(self->handle, NULL);
485	}
486
487	static PyObject* shapefile_repr(ShapeFileObject* self)
488	{
489	/* TODO: it would be nice to do something like "shapelib.ShapeFile(filename, mode)" instead */
490	return PyString_FromFormat("<shapelib.ShapeFile object at %p>", self->handle);
491	}
492
493	static struct PyMethodDef shapefile_methods[] =
494	{
495	{"close", (PyCFunction)shapefile_close, METH_NOARGS, "close the shape file" },
496	{"info", (PyCFunction)shapefile_info, METH_NOARGS,
497	"Return a tuple (NUM_SHAPES, TYPE, MIN, MAX) where NUM_SHAPES is the number of shapes in the file, TYPE is the "
498	"shape type and MIN and MAX are 4-element tuples with the min. and max. values of the data." },
499	{"read_object", (PyCFunction)shapefile_read_object, METH_VARARGS, "Return object number i" },
500	{"write_object", (PyCFunction)shapefile_write_object, METH_VARARGS, "Write an object"},
501	{"cobject", (PyCFunction)shapefile_cobject, METH_NOARGS, "Return the shapelib SHPHandle as a Python CObject"},
502	{NULL}
503	};
504
505	static struct PyGetSetDef shapefile_getsetters[] =
506	{
507	{NULL}
508	};
509
510	static PyTypeObject ShapeFileType = PYSHAPELIB_DEFINE_TYPE(ShapeFileObject, shapefile, "shapelib.ShapeFile", 0);
511
512	/* --- shapelib ------------------------------------------------------------------------------------------------------ */
513
514	static PyObject* shapelib_open(PyObject* module, PyObject* args)
515	{
516	return PyObject_CallObject((PyObject*)&ShapeFileType, args);
517	}
518
519	static PyObject* shapelib_create(PyObject* module, PyObject* args)
520	{
521	char* file;
522	int type;
523	ShapeFileObject* result;
524
525	if (!PyArg_ParseTuple(args, "si", &file, &type)) return NULL;
526
527	result = PyObject_New(ShapeFileObject, &ShapeFileType);
528	if (!result)
529	{
530	return PyErr_NoMemory();
531	}
532
533	result->handle = SHPCreate(file, type);
534	if (!result->handle)
535	{
536	PyObject_Del((PyObject*)result);
537	PyErr_SetString(PyExc_RuntimeError, "Failed to create ShapeFile");
538	return NULL;
539	}
540
541	return (PyObject*) result;
542	}
543
544	static PyShapeLibAPI shapelib_the_api =
545	{
546	SHPReadObject,
547	SHPDestroyObject,
548	SHPCreateTree,
549	SHPDestroyTree,
550	SHPTreeFindLikelyShapes
551	};
552
553	static PyObject* shapelib_c_api(PyObject* module)
554	{
555	return PyCObject_FromVoidPtr(&shapelib_the_api, NULL);
556	}
557
558	static PyObject* shapelib_type_name(PyObject* module, PyObject* args)
559	{
560	int type;
561	if (!PyArg_ParseTuple(args, "i", &type)) return NULL;
562	return PyString_FromString(SHPTypeName(type));
563	}
564
565	static PyObject* shapelib_part_type_name(PyObject* module, PyObject* args)
566	{
567	int type;
568	if (!PyArg_ParseTuple(args, "i", &type)) return NULL;
569	return PyString_FromString(SHPPartTypeName(type));
570	}
571
572	static struct PyMethodDef shapelib_methods[] =
573	{
574	{"open", (PyCFunction)shapelib_open, METH_VARARGS, "open a ShapeFile" },
575	{"create", (PyCFunction)shapelib_create, METH_VARARGS, "create a ShapeFile" },
576	{"c_api", (PyCFunction)shapelib_c_api, METH_NOARGS, "get C API of shapelib" },
577	{"type_name", (PyCFunction)shapelib_type_name, METH_VARARGS, "return type as string" },
578	{"part_type_name", (PyCFunction)shapelib_part_type_name, METH_VARARGS, "return part type as string" },
579	{NULL}
580	};
581
582	PyMODINIT_FUNC initshapelib(void)
583	{
584	PyObject* module = Py_InitModule("shapelib", shapelib_methods);
585	if (!module) return;
586
587	PYSHAPELIB_ADD_TYPE(SHPObjectType, "SHPObject");
588	PYSHAPELIB_ADD_TYPE(ShapeFileType, "ShapeFile");
589
590	PYSHAPELIB_ADD_CONSTANT(SHPT_NULL);
591	PYSHAPELIB_ADD_CONSTANT(SHPT_POINT);
592	PYSHAPELIB_ADD_CONSTANT(SHPT_ARC);
593	PYSHAPELIB_ADD_CONSTANT(SHPT_POLYGON);
594	PYSHAPELIB_ADD_CONSTANT(SHPT_MULTIPOINT);
595	PYSHAPELIB_ADD_CONSTANT(SHPT_POINTZ);
596	PYSHAPELIB_ADD_CONSTANT(SHPT_ARCZ);
597	PYSHAPELIB_ADD_CONSTANT(SHPT_POLYGONZ);
598	PYSHAPELIB_ADD_CONSTANT(SHPT_MULTIPOINTZ);
599	PYSHAPELIB_ADD_CONSTANT(SHPT_POINTM);
600	PYSHAPELIB_ADD_CONSTANT(SHPT_ARCM);
601	PYSHAPELIB_ADD_CONSTANT(SHPT_POLYGONM);
602	PYSHAPELIB_ADD_CONSTANT(SHPT_MULTIPOINTM);
603	PYSHAPELIB_ADD_CONSTANT(SHPT_MULTIPATCH);
604	PYSHAPELIB_ADD_CONSTANT(SHPP_TRISTRIP);
605	PYSHAPELIB_ADD_CONSTANT(SHPP_TRIFAN);
606	PYSHAPELIB_ADD_CONSTANT(SHPP_OUTERRING);
607	PYSHAPELIB_ADD_CONSTANT(SHPP_INNERRING);
608	PYSHAPELIB_ADD_CONSTANT(SHPP_FIRSTRING);
609	PYSHAPELIB_ADD_CONSTANT(SHPP_RING);
610	}
611
Name	Value
svn:eol-style	native
svn:keywords	Author Date Id Revision