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#include <float.h>
#include <grass/gis.h>
#include <grass/vector.h>
#include <grass/glocale.h>
#include "local_proto.h"
#ifdef HAVE_GEOS
static int ring2pts(const GEOSGeometry *geom, struct line_pnts *Points)
{
int i, ncoords;
double x, y, z;
const GEOSCoordSequence *seq = NULL;
G_debug(3, "ring2pts()");
Vect_reset_line(Points);
if (!geom) {
G_warning(_("Invalid GEOS geometry!"));
return 0;
}
z = 0.0;
ncoords = GEOSGetNumCoordinates(geom);
if (!ncoords) {
G_warning(_("No coordinates in GEOS geometry (can be ok for negative "
"distance)!"));
return 0;
}
seq = GEOSGeom_getCoordSeq(geom);
for (i = 0; i < ncoords; i++) {
GEOSCoordSeq_getX(seq, i, &x);
GEOSCoordSeq_getY(seq, i, &y);
if (x != x || x > DBL_MAX || x < -DBL_MAX)
G_fatal_error(_("Invalid x coordinate %f"), x);
if (y != y || y > DBL_MAX || y < -DBL_MAX)
G_fatal_error(_("Invalid y coordinate %f"), y);
Vect_append_point(Points, x, y, z);
}
return 1;
}
static int geom2ring(GEOSGeometry *geom, struct Map_info *Out,
struct Map_info *Buf, struct spatial_index *si,
struct line_cats *Cats, struct buf_contours **arr_bc,
int *buffers_count, int *arr_bc_alloc)
{
int i, nrings, ngeoms, line_id;
const GEOSGeometry *geom2;
struct bound_box bbox;
static struct line_pnts *Points = NULL;
static struct line_cats *BCats = NULL;
struct buf_contours *p = *arr_bc;
G_debug(3, "geom2ring(): GEOS %s", GEOSGeomType(geom));
if (!Points)
Points = Vect_new_line_struct();
if (!BCats)
BCats = Vect_new_cats_struct();
if (GEOSGeomTypeId(geom) == GEOS_LINESTRING ||
GEOSGeomTypeId(geom) == GEOS_LINEARRING) {
if (!ring2pts(geom, Points))
return 0;
Vect_write_line(Out, GV_BOUNDARY, Points, BCats);
line_id = Vect_write_line(Buf, GV_BOUNDARY, Points, Cats);
/* add buffer to spatial index */
Vect_get_line_box(Buf, line_id, &bbox);
Vect_spatial_index_add_item(si, *buffers_count, &bbox);
p[*buffers_count].outer = line_id;
p[*buffers_count].inner_count = 0;
*buffers_count += 1;
if (*buffers_count >= *arr_bc_alloc) {
*arr_bc_alloc += 100;
p = G_realloc(p, *arr_bc_alloc * sizeof(struct buf_contours));
*arr_bc = p;
}
}
else if (GEOSGeomTypeId(geom) == GEOS_POLYGON) {
geom2 = GEOSGetExteriorRing(geom);
if (!ring2pts(geom2, Points))
return 0;
Vect_write_line(Out, GV_BOUNDARY, Points, BCats);
line_id = Vect_write_line(Buf, GV_BOUNDARY, Points, Cats);
/* add buffer to spatial index */
Vect_get_line_box(Buf, line_id, &bbox);
Vect_spatial_index_add_item(si, *buffers_count, &bbox);
p[*buffers_count].outer = line_id;
p[*buffers_count].inner_count = 0;
nrings = GEOSGetNumInteriorRings(geom);
if (nrings > 0) {
p[*buffers_count].inner_count = nrings;
p[*buffers_count].inner = G_malloc(nrings * sizeof(int));
for (i = 0; i < nrings; i++) {
geom2 = GEOSGetInteriorRingN(geom, i);
if (!ring2pts(geom2, Points)) {
G_fatal_error(_("Corrupt GEOS geometry"));
}
Vect_write_line(Out, GV_BOUNDARY, Points, BCats);
line_id = Vect_write_line(Buf, GV_BOUNDARY, Points, BCats);
p[*buffers_count].inner[i] = line_id;
}
}
*buffers_count += 1;
if (*buffers_count >= *arr_bc_alloc) {
*arr_bc_alloc += 100;
p = G_realloc(p, *arr_bc_alloc * sizeof(struct buf_contours));
*arr_bc = p;
}
}
else if (GEOSGeomTypeId(geom) == GEOS_MULTILINESTRING ||
GEOSGeomTypeId(geom) == GEOS_MULTIPOLYGON ||
GEOSGeomTypeId(geom) == GEOS_GEOMETRYCOLLECTION) {
G_debug(3, "GEOS %s", GEOSGeomType(geom));
ngeoms = GEOSGetNumGeometries(geom);
for (i = 0; i < ngeoms; i++) {
geom2 = GEOSGetGeometryN(geom, i);
geom2ring((GEOSGeometry *)geom2, Out, Buf, si, Cats, arr_bc,
buffers_count, arr_bc_alloc);
}
}
else
G_fatal_error(_("Unknown GEOS geometry type"));
return 1;
}
int geos_buffer(struct Map_info *In, struct Map_info *Out, struct Map_info *Buf,
int id, int type, double da, struct spatial_index *si,
struct line_cats *Cats, struct buf_contours **arr_bc,
int *buffers_count, int *arr_bc_alloc, int flat, int no_caps)
{
GEOSGeometry *IGeom = NULL;
GEOSGeometry *OGeom = NULL;
G_debug(3, "geos_buffer(): id=%d", id);
if (type == GV_AREA)
IGeom = Vect_read_area_geos(In, id);
else
IGeom = Vect_read_line_geos(In, id, &type);
/* GEOS code comment on the number of quadrant segments:
* A value of 8 gives less than 2% max error in the buffer distance.
* For a max error of < 1%, use QS = 12.
* For a max error of < 0.1%, use QS = 18. */
#ifdef GEOS_3_3
if (flat || no_caps) {
GEOSBufferParams *geos_params = GEOSBufferParams_create();
GEOSBufferParams_setEndCapStyle(
geos_params, no_caps ? GEOSBUF_CAP_FLAT : GEOSBUF_CAP_SQUARE);
OGeom = GEOSBufferWithParams(IGeom, geos_params, da);
GEOSBufferParams_destroy(geos_params);
}
else {
OGeom = GEOSBuffer(IGeom, da, 12);
}
#else
OGeom = GEOSBuffer(IGeom, da, 12);
#endif
if (!OGeom) {
G_fatal_error(_("Buffering failed (feature %d)"), id);
}
geom2ring(OGeom, Out, Buf, si, Cats, arr_bc, buffers_count, arr_bc_alloc);
if (IGeom)
GEOSGeom_destroy(IGeom);
if (OGeom)
GEOSGeom_destroy(OGeom);
return 1;
}
#endif /* HAVE_GEOS */
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