PostGIS  2.1.10dev-r@@SVN_REVISION@@
static LWGEOM* parse_gml_triangle ( xmlNodePtr  xnode,
bool *  hasz,
int *  root_srid 
)
static

Parse GML Triangle (3.1.1)

Definition at line 1212 of file lwgeom_in_gml.c.

References get_xlink_node(), gml_lwerror(), gml_reproject_pa(), gmlGetProp(), is_gml_namespace(), is_xlink(), lwalloc(), lwtriangle_as_lwgeom(), lwtriangle_construct(), lwtriangle_construct_empty(), POINTARRAY::npoints, parse_gml_data(), parse_gml_srs(), ptarray_flip_coordinates(), ptarray_is_closed_2d(), ptarray_is_closed_3d(), struct_gmlSrs::reverse_axis, struct_gmlSrs::srid, and SRID_UNKNOWN.

Referenced by parse_gml(), and parse_gml_tin().

1213 {
1214  gmlSrs srs;
1215  LWGEOM *geom;
1216  xmlNodePtr xa, xb;
1217  POINTARRAY *pa = NULL;
1218  xmlChar *interpolation=NULL;
1219 
1220  if (is_xlink(xnode)) xnode = get_xlink_node(xnode);
1221 
1222  if (xnode->children == NULL)
1223  return lwtriangle_as_lwgeom(lwtriangle_construct_empty(*root_srid, 0, 0));
1224 
1225  /* GML SF is resticted to planar interpolation
1226  NOTA: I know Triangle is not part of SF, but
1227  we have to be consistent with other surfaces */
1228  interpolation = gmlGetProp(xnode, (xmlChar *) "interpolation");
1229  if (interpolation != NULL)
1230  {
1231  if (strcmp((char *) interpolation, "planar"))
1232  gml_lwerror("invalid GML representation", 45);
1233  xmlFree(interpolation);
1234  }
1235 
1236  parse_gml_srs(xnode, &srs);
1237 
1238  for (xa = xnode->children ; xa != NULL ; xa = xa->next)
1239  {
1240  /* Triangle/exterior */
1241  if (xa->type != XML_ELEMENT_NODE) continue;
1242  if (!is_gml_namespace(xa, false)) continue;
1243  if (strcmp((char *) xa->name, "exterior")) continue;
1244 
1245  for (xb = xa->children ; xb != NULL ; xb = xb->next)
1246  {
1247  /* Triangle/exterior/LinearRing */
1248  if (xb->type != XML_ELEMENT_NODE) continue;
1249  if (!is_gml_namespace(xb, false)) continue;
1250  if (strcmp((char *) xb->name, "LinearRing")) continue;
1251 
1252  pa = (POINTARRAY*) lwalloc(sizeof(POINTARRAY));
1253  pa = parse_gml_data(xb->children, hasz, root_srid);
1254 
1255  if (pa->npoints != 4
1256  || (!*hasz && !ptarray_is_closed_2d(pa))
1257  || (*hasz && !ptarray_is_closed_3d(pa)))
1258  gml_lwerror("invalid GML representation", 46);
1259 
1260  if (srs.reverse_axis) pa = ptarray_flip_coordinates(pa);
1261  }
1262  }
1263 
1264  /* Exterior Ring is mandatory */
1265  if (pa == NULL) gml_lwerror("invalid GML representation", 47);
1266 
1267  if (srs.srid != *root_srid && *root_srid != SRID_UNKNOWN)
1268  gml_reproject_pa(pa, srs.srid, *root_srid);
1269 
1270  geom = (LWGEOM *) lwtriangle_construct(*root_srid, NULL, pa);
1271 
1272  return geom;
1273 }
LWTRIANGLE * lwtriangle_construct_empty(int srid, char hasz, char hasm)
Definition: lwtriangle.c:45
int npoints
Definition: liblwgeom.h:327
static void parse_gml_srs(xmlNodePtr xnode, gmlSrs *srs)
Parse gml srsName attribute.
int ptarray_is_closed_3d(const POINTARRAY *pa)
Definition: ptarray.c:678
static xmlChar * gmlGetProp(xmlNodePtr xnode, xmlChar *prop)
Retrieve a GML propertie from a node or NULL otherwise Respect namespaces if presents in the node ele...
int ptarray_is_closed_2d(const POINTARRAY *pa)
Definition: ptarray.c:672
static POINTARRAY * gml_reproject_pa(POINTARRAY *pa, int srid_in, int srid_out)
Use Proj4 to reproject a given POINTARRAY.
POINTARRAY * ptarray_flip_coordinates(POINTARRAY *pa)
Reverse X and Y axis on a given POINTARRAY.
Definition: ptarray.c:354
static xmlNodePtr get_xlink_node(xmlNodePtr xnode)
Return a xmlNodePtr on a node referenced by a XLink or NULL otherwise.
LWGEOM * geom
#define SRID_UNKNOWN
Unknown SRID value.
Definition: liblwgeom.h:154
LWGEOM * lwtriangle_as_lwgeom(const LWTRIANGLE *obj)
Definition: lwgeom.c:244
static bool is_xlink(xmlNodePtr node)
Return true if current node contains a simple XLink Return false otherwise.
LWTRIANGLE * lwtriangle_construct(int srid, GBOX *bbox, POINTARRAY *points)
Definition: lwtriangle.c:27
static POINTARRAY * parse_gml_data(xmlNodePtr xnode, bool *hasz, int *root_srid)
Parse data coordinates.
static bool is_gml_namespace(xmlNodePtr xnode, bool is_strict)
Return false if current element namespace is not a GML one Return true otherwise. ...
static void gml_lwerror(char *msg, int error_code)
Definition: lwgeom_in_gml.c:68
void * lwalloc(size_t size)
Definition: lwutil.c:175

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