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https://git.osgeo.org/gitea/postgis/postgis
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bf2901b473
git-svn-id: http://svn.osgeo.org/postgis/trunk@12198 b70326c6-7e19-0410-871a-916f4a2858ee
176 lines
3.5 KiB
C
176 lines
3.5 KiB
C
/**********************************************************************
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*
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* PostGIS - Spatial Types for PostgreSQL
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* http://postgis.net
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*
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* Copyright (C) 2001-2006 Refractions Research Inc.
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*
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* This is free software; you can redistribute and/or modify it under
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* the terms of the GNU General Public Licence. See the COPYING file.
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*
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**********************************************************************/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "liblwgeom_internal.h"
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#include "lwgeom_log.h"
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LWTIN* lwtin_add_lwtriangle(LWTIN *mobj, const LWTRIANGLE *obj)
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{
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return (LWTIN*)lwcollection_add_lwgeom((LWCOLLECTION*)mobj, (LWGEOM*)obj);
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}
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void lwtin_free(LWTIN *tin)
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{
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int i;
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if ( ! tin ) return;
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if ( tin->bbox )
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lwfree(tin->bbox);
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for ( i = 0; i < tin->ngeoms; i++ )
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if ( tin->geoms && tin->geoms[i] )
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lwtriangle_free(tin->geoms[i]);
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if ( tin->geoms )
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lwfree(tin->geoms);
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lwfree(tin);
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}
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void printLWTIN(LWTIN *tin)
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{
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int i;
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LWTRIANGLE *triangle;
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if (tin->type != TINTYPE)
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lwerror("printLWTIN called with something else than a TIN");
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lwnotice("LWTIN {");
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lwnotice(" ndims = %i", (int)FLAGS_NDIMS(tin->flags));
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lwnotice(" SRID = %i", (int)tin->srid);
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lwnotice(" ngeoms = %i", (int)tin->ngeoms);
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for (i=0; i<tin->ngeoms; i++)
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{
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triangle = (LWTRIANGLE *) tin->geoms[i];
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printPA(triangle->points);
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}
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lwnotice("}");
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}
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/*
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* TODO rewrite all this stuff to be based on a truly topological model
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*/
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struct struct_tin_arcs
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{
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double ax, ay, az;
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double bx, by, bz;
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int cnt, face;
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};
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typedef struct struct_tin_arcs *tin_arcs;
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/* We supposed that the geometry is valid
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we could have wrong result if not */
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int lwtin_is_closed(const LWTIN *tin)
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{
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int i, j, k;
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int narcs, carc;
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int found;
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tin_arcs arcs;
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POINT4D pa, pb;
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LWTRIANGLE *patch;
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/* If surface is not 3D, it's can't be closed */
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if (!FLAGS_GET_Z(tin->flags)) return 0;
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/* Max theorical arcs number if no one is shared ... */
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narcs = 3 * tin->ngeoms;
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arcs = lwalloc(sizeof(struct struct_tin_arcs) * narcs);
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for (i=0, carc=0; i < tin->ngeoms ; i++)
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{
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patch = (LWTRIANGLE *) tin->geoms[i];
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for (j=0; j < 3 ; j++)
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{
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getPoint4d_p(patch->points, j, &pa);
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getPoint4d_p(patch->points, j+1, &pb);
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/* Make sure to order the 'lower' point first */
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if ( (pa.x > pb.x) ||
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(pa.x == pb.x && pa.y > pb.y) ||
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(pa.x == pb.x && pa.y == pb.y && pa.z > pb.z) )
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{
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pa = pb;
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getPoint4d_p(patch->points, j, &pb);
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}
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for (found=0, k=0; k < carc ; k++)
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{
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if ( ( arcs[k].ax == pa.x && arcs[k].ay == pa.y &&
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arcs[k].az == pa.z && arcs[k].bx == pb.x &&
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arcs[k].by == pb.y && arcs[k].bz == pb.z &&
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arcs[k].face != i) )
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{
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arcs[k].cnt++;
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found = 1;
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/* Look like an invalid TIN
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anyway not a closed one */
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if (arcs[k].cnt > 2)
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{
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lwfree(arcs);
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return 0;
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}
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}
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}
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if (!found)
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{
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arcs[carc].cnt=1;
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arcs[carc].face=i;
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arcs[carc].ax = pa.x;
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arcs[carc].ay = pa.y;
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arcs[carc].az = pa.z;
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arcs[carc].bx = pb.x;
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arcs[carc].by = pb.y;
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arcs[carc].bz = pb.z;
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carc++;
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/* Look like an invalid TIN
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anyway not a closed one */
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if (carc > narcs)
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{
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lwfree(arcs);
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return 0;
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}
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}
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}
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}
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/* A TIN is closed if each edge
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is shared by exactly 2 faces */
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for (k=0; k < carc ; k++)
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{
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if (arcs[k].cnt != 2)
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{
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lwfree(arcs);
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return 0;
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}
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}
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lwfree(arcs);
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/* Invalid TIN case */
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if (carc < tin->ngeoms) return 0;
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return 1;
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}
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