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Add mathutils.geometry.delaunay_2d_cdt() function to Python API.

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Provides Python API access to recently added Constrained Delaunay
Triangulation routine.
Reviewed in D5467.
This commit is contained in:
Howard Trickey
2019-08-13 07:31:14 -04:00
parent 918150a0b9
commit 6f9cbbc8ec
3 changed files with 343 additions and 0 deletions
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185
source/blender/python/mathutils/mathutils_geometry.c
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@@ -29,6 +29,7 @@
# include "BLI_blenlib.h"
# include "BLI_boxpack_2d.h"
# include "BLI_convexhull_2d.h"
# include "BLI_delaunay_2d.h"
# include "BKE_displist.h"
# include "BKE_curve.h"
#endif
@@ -1507,6 +1508,186 @@ static PyObject *M_Geometry_convex_hull_2d(PyObject *UNUSED(self), PyObject *poi
return ret;
}
/* Return a PyObject that is a list of lists, using the flattened list array
* to fill values, with start_table and len_table giving the start index
* and length of the toplevel_len sublists
*/
static PyObject *list_of_lists_from_arrays(int *array,
int *start_table,
int *len_table,
int toplevel_len)
{
PyObject *ret, *sublist;
int i, j, sublist_len, sublist_start, val;
ret = PyList_New(toplevel_len);
for (i = 0; i < toplevel_len; i++) {
sublist_len = len_table[i];
sublist = PyList_New(sublist_len);
sublist_start = start_table[i];
for (j = 0; j < sublist_len; j++) {
val = array[sublist_start + j];
PyList_SET_ITEM(sublist, j, PyLong_FromLong(val));
}
PyList_SET_ITEM(ret, i, sublist);
}
return ret;
}
PyDoc_STRVAR(
M_Geometry_delaunay_2d_cdt_doc,
".. function:: delaunay_2d_cdt(vert_coords, edges, faces, output_type, epsilon)\n"
"\n"
"Computes the Constrained Delaunay Triangulation of a set of vertices, "
"with edges and faces that must appear in the triangulation. "
"Some triangles may be eaten away, or combined with other triangles, "
"according to output type. "
"The returned verts may be in a different order from input verts, may be moved "
"slightly, and may be merged with other nearby verts. "
"The three returned orig lists give, for each of verts, edges, and faces, the list of "
"input element indices corresponding to the positionally same output element. "
"For edges, the orig indices start with the input edges and then continue "
"with the edges implied by each of the faces (n of them for an n-gon).\n"
"\n"
" :arg vert_coords: Vertex coordinates (2d)\n"
" :type vert_coords: list of :class:`mathutils.Vector`\n"
" :arg edges: Edges, as pairs of indices in `vert_coords`\n"
" :type edges: list of (int, int)\n"
" :arg faces: Faces, each sublist is a face, as indices in `vert_coords` (CCW oriented)\n"
" :type faces: list of list of int\n"
" :arg output_type: What output looks like. 0 => triangles with convex hull. "
"1 => triangles inside constraints. "
"2 => the input constraints, intersected. "
"3 => like 2 but with extra edges to make valid BMesh faces.\n"
" :type output_type: int\\n"
" :arg epsilon: For nearness tests; should not be zero\n"
" :type epsilon: float\n"
" :return: Output tuple, (vert_coords, edges, faces, orig_verts, orig_edges, orig_faces)\n"
" :rtype: (list of `mathutils.Vector`, "
"list of (int, int), "
"list of list of int, "
"list of list of int, "
"list of list of int, "
"list of list of int)\n"
"\n");
static PyObject *M_Geometry_delaunay_2d_cdt(PyObject *UNUSED(self), PyObject *args)
{
const char *error_prefix = "delaunay_2d_cdt";
PyObject *vert_coords, *edges, *faces, *item;
int output_type;
float epsilon;
float(*in_coords)[2] = NULL;
int(*in_edges)[2] = NULL;
int *in_faces = NULL;
int *in_faces_start_table = NULL;
int *in_faces_len_table = NULL;
Py_ssize_t vert_coords_len, edges_len, faces_len;
CDT_input in;
CDT_result *res = NULL;
PyObject *out_vert_coords = NULL;
PyObject *out_edges = NULL;
PyObject *out_faces = NULL;
PyObject *out_orig_verts = NULL;
PyObject *out_orig_edges = NULL;
PyObject *out_orig_faces = NULL;
PyObject *ret_value = NULL;
int i;
if (!PyArg_ParseTuple(
args, "OOOif:delaunay_2d_cdt", &vert_coords, &edges, &faces, &output_type, &epsilon)) {
return NULL;
}
vert_coords_len = mathutils_array_parse_alloc_v(
(float **)&in_coords, 2, vert_coords, error_prefix);
if (vert_coords_len == -1) {
return NULL;
}
edges_len = mathutils_array_parse_alloc_vi((int **)&in_edges, 2, edges, error_prefix);
if (edges_len == -1) {
goto exit_cdt;
}
faces_len = mathutils_array_parse_alloc_viseq(
&in_faces, &in_faces_start_table, &in_faces_len_table, faces, error_prefix);
if (faces_len == -1) {
goto exit_cdt;
}
in.verts_len = (int)vert_coords_len;
in.vert_coords = in_coords;
in.edges_len = edges_len;
in.faces_len = faces_len;
in.edges = in_edges;
in.faces = in_faces;
in.faces_start_table = in_faces_start_table;
in.faces_len_table = in_faces_len_table;
in.epsilon = epsilon;
res = BLI_delaunay_2d_cdt_calc(&in, output_type);
ret_value = PyTuple_New(6);
out_vert_coords = PyList_New(res->verts_len);
for (i = 0; i < res->verts_len; i++) {
item = Vector_CreatePyObject(res->vert_coords[i], 2, NULL);
if (item == NULL) {
Py_DECREF(ret_value);
Py_DECREF(out_vert_coords);
goto exit_cdt;
}
PyList_SET_ITEM(out_vert_coords, i, item);
}
PyTuple_SET_ITEM(ret_value, 0, out_vert_coords);
out_edges = PyList_New(res->edges_len);
for (i = 0; i < res->edges_len; i++) {
item = PyTuple_New(2);
PyTuple_SET_ITEM(item, 0, PyLong_FromLong((long)res->edges[i][0]));
PyTuple_SET_ITEM(item, 1, PyLong_FromLong((long)res->edges[i][1]));
PyList_SET_ITEM(out_edges, i, item);
}
PyTuple_SET_ITEM(ret_value, 1, out_edges);
out_faces = list_of_lists_from_arrays(
res->faces, res->faces_start_table, res->faces_len_table, res->faces_len);
PyTuple_SET_ITEM(ret_value, 2, out_faces);
out_orig_verts = list_of_lists_from_arrays(
res->verts_orig, res->verts_orig_start_table, res->verts_orig_len_table, res->verts_len);
PyTuple_SET_ITEM(ret_value, 3, out_orig_verts);
out_orig_edges = list_of_lists_from_arrays(
res->edges_orig, res->edges_orig_start_table, res->edges_orig_len_table, res->edges_len);
PyTuple_SET_ITEM(ret_value, 4, out_orig_edges);
out_orig_faces = list_of_lists_from_arrays(
res->faces_orig, res->faces_orig_start_table, res->faces_orig_len_table, res->faces_len);
PyTuple_SET_ITEM(ret_value, 5, out_orig_faces);
exit_cdt:
if (in_coords != NULL) {
PyMem_Free(in_coords);
}
if (in_edges != NULL) {
PyMem_Free(in_edges);
}
if (in_faces != NULL) {
PyMem_Free(in_faces);
}
if (in_faces_start_table != NULL) {
PyMem_Free(in_faces_start_table);
}
if (in_faces_len_table != NULL) {
PyMem_Free(in_faces_len_table);
}
if (res) {
BLI_delaunay_2d_cdt_free(res);
}
return ret_value;
}
#endif /* MATH_STANDALONE */
static PyMethodDef M_Geometry_methods[] = {
@@ -1593,6 +1774,10 @@ static PyMethodDef M_Geometry_methods[] = {
(PyCFunction)M_Geometry_convex_hull_2d,
METH_O,
M_Geometry_convex_hull_2d_doc},
{"delaunay_2d_cdt",
(PyCFunction)M_Geometry_delaunay_2d_cdt,
METH_VARARGS,
M_Geometry_delaunay_2d_cdt_doc},
{"box_fit_2d", (PyCFunction)M_Geometry_box_fit_2d, METH_O, M_Geometry_box_fit_2d_doc},
{"box_pack_2d", (PyCFunction)M_Geometry_box_pack_2d, METH_O, M_Geometry_box_pack_2d_doc},
#endif