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https://git.osgeo.org/gitea/postgis/postgis
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109 lines
2.9 KiB
C
109 lines
2.9 KiB
C
/**********************************************************************
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*
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* PostGIS - Spatial Types for PostgreSQL
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* http://postgis.refractions.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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int
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lwcompound_is_closed(const LWCOMPOUND *compound)
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{
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size_t size;
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int npoints=0;
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if (!FLAGS_GET_Z(compound->flags))
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size = sizeof(POINT2D);
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else size = sizeof(POINT3D);
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if (compound->geoms[compound->ngeoms - 1]->type == CIRCSTRINGTYPE)
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npoints = ((LWCIRCSTRING *)compound->geoms[compound->ngeoms - 1])->points->npoints;
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else if (compound->geoms[compound->ngeoms - 1]->type == LINETYPE)
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npoints = ((LWLINE *)compound->geoms[compound->ngeoms - 1])->points->npoints;
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if ( memcmp(getPoint_internal( (POINTARRAY *)compound->geoms[0]->data, 0),
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getPoint_internal( (POINTARRAY *)compound->geoms[compound->ngeoms - 1]->data,
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npoints - 1),
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size) ) return LW_FALSE;
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return LW_TRUE;
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}
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double lwcompound_length(const LWCOMPOUND *comp)
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{
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double length = 0.0;
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LWLINE *line;
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if ( lwgeom_is_empty((LWGEOM*)comp) )
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return 0.0;
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line = lwcompound_segmentize(comp, 32);
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length = lwline_length(line);
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lwline_free(line);
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return length;
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}
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double lwcompound_length_2d(const LWCOMPOUND *comp)
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{
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double length = 0.0;
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LWLINE *line;
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if ( lwgeom_is_empty((LWGEOM*)comp) )
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return 0.0;
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line = lwcompound_segmentize(comp, 32);
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length = lwline_length_2d(line);
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lwline_free(line);
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return length;
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}
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int lwcompound_add_lwgeom(LWCOMPOUND *comp, LWGEOM *geom)
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{
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LWCOLLECTION *col = (LWCOLLECTION*)comp;
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/* Empty things can't continuously join up with other things */
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if ( lwgeom_is_empty(geom) )
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{
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LWDEBUG(4, "Got an empty component for a compound curve!");
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return LW_FAILURE;
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}
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if( col->ngeoms > 0 )
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{
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POINT4D last, first;
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/* First point of the component we are adding */
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LWLINE *newline = (LWLINE*)geom;
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/* Last point of the previous component */
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LWLINE *prevline = (LWLINE*)(col->geoms[col->ngeoms-1]);
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getPoint4d_p(newline->points, 0, &first);
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getPoint4d_p(prevline->points, prevline->points->npoints-1, &last);
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if ( !(FP_EQUALS(first.x,last.x) && FP_EQUALS(first.y,last.y)) )
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{
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LWDEBUG(4, "Components don't join up end-to-end!");
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LWDEBUGF(4, "first pt (%g %g %g %g) last pt (%g %g %g %g)", first.x, first.y, first.z, first.m, last.x, last.y, last.z, last.m);
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return LW_FAILURE;
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}
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}
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col = lwcollection_add_lwgeom(col, geom);
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return LW_SUCCESS;
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}
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LWCOMPOUND *
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lwcompound_construct_empty(int srid, char hasz, char hasm)
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{
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LWCOMPOUND *ret = (LWCOMPOUND*)lwcollection_construct_empty(COMPOUNDTYPE, srid, hasz, hasm);
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return ret;
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}
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