parse_gml_triangle()

static LWGEOM* parse_gml_triangle ( xmlNodePtr  xnode, bool *  hasz, int *  root_srid  )

static

Parse GML Triangle (3.1.1)

Definition at line 1331 of file lwgeom_in_gml.c.

{
        gmlSrs srs;
        LWGEOM *geom;
        xmlNodePtr xa, xb;
        POINTARRAY *pa = NULL;
        xmlChar *interpolation=NULL;
 
        if (is_xlink(xnode)) xnode = get_xlink_node(xnode);
        if (xnode == NULL)
                gml_lwpgerror("invalid GML representation", 30);
 
        if (xnode->children == NULL)
                return lwtriangle_as_lwgeom(lwtriangle_construct_empty(*root_srid, 0, 0));
 
        /* GML SF is restricted to planar interpolation
               NOTA: I know Triangle is not part of SF, but
               we have to be consistent with other surfaces */
        interpolation = gmlGetProp(xnode, "interpolation");
        if (interpolation != NULL)
        {
                if (strcmp((char *) interpolation, "planar"))
                        gml_lwpgerror("invalid GML representation", 45);
                xmlFree(interpolation);
        }
 
        parse_gml_srs(xnode, &srs);
 
        for (xa = xnode->children ; xa != NULL ; xa = xa->next)
        {
                /* Triangle/exterior */
                if (xa->type != XML_ELEMENT_NODE) continue;
                if (!is_gml_namespace(xa, false)) continue;
                if (!is_gml_element(xa, "exterior")) continue;
 
                for (xb = xa->children ; xb != NULL ; xb = xb->next)
                {
                        /* Triangle/exterior/LinearRing */
                        if (xb->type != XML_ELEMENT_NODE) continue;
                        if (!is_gml_namespace(xb, false)) continue;
                        if (!is_gml_element(xb, "LinearRing")) continue;
 
                        pa = (POINTARRAY*) lwalloc(sizeof(POINTARRAY));
                        pa = parse_gml_data(xb->children, hasz, root_srid);
 
                        if (pa->npoints != 4
                                || (!*hasz && !ptarray_is_closed_2d(pa))
                                ||  (*hasz && !ptarray_is_closed_3d(pa)))
                                gml_lwpgerror("invalid GML representation", 46);
 
                        if (srs.reverse_axis) pa = ptarray_flip_coordinates(pa);
                }
        }
 
        /* Exterior Ring is mandatory */
        if (pa == NULL) gml_lwpgerror("invalid GML representation", 47);
 
        if (srs.srid != *root_srid && *root_srid != SRID_UNKNOWN)
                gml_reproject_pa(pa, srs.srid, *root_srid);
 
        geom = (LWGEOM *) lwtriangle_construct(*root_srid, NULL, pa);
 
        return geom;
}

References get_xlink_node(), gml_lwpgerror(), gml_reproject_pa(), gmlGetProp(), is_gml_element(), 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().

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