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/*
****************************************************************************
*
* MODULE: Vector library
*
* AUTHOR(S): Radim Blazek
*
* PURPOSE: Higher level functions for reading/writing/manipulating vectors.
*
* COPYRIGHT: (C) 2001 by the GRASS Development Team
*
* This program is free software under the GNU General Public
* License (>=v2). Read the file COPYING that comes with GRASS
* for details.
*
*****************************************************************************/
#include <string.h>
#include "Vect.h"
/* This is file is just example and starting point for writing overlay functions!!! */
int Vect_overlay_and ( struct Map_info *, int, struct ilist *, struct ilist *,
struct Map_info *, int, struct ilist *, struct ilist *,
struct Map_info *);
/*!
\fn int Vect_overlay_str_to_operator ( char *str )
\brief Get operator code from string
\return operator code, -1 on error
\param operator code string
*/
int
Vect_overlay_str_to_operator ( char *str )
{
if ( strcmp ( str, GV_ON_AND ) == 0 )
return GV_O_AND;
else if ( strcmp ( str, GV_ON_OVERLAP ) == 0 )
return GV_O_OVERLAP;
return -1;
}
/*!
\fn int Vect_overlay ( struct Map_info *AMap, int atype, struct ilist *AList, struct ilist *AAList,
struct Map_info *BMap, int btype, struct ilist *BList, struct ilist *BAList,
int operator, struct Map_info *OMap )
\brief Overlay 2 maps and create new one
\return 0 on success,?? on error
\param AMap, atype, AList, AAList, BMap, btype, BList, BAList,
operator, OMap
*/
int
Vect_overlay ( struct Map_info *AMap, int atype, struct ilist *AList, struct ilist *AAList, /* map A */
struct Map_info *BMap, int btype, struct ilist *BList, struct ilist *BAList, /* map B */
int operator,
struct Map_info *OMap ) /* output map */
{
switch (operator) {
case GV_O_AND:
Vect_overlay_and ( AMap, atype, AList, AAList, BMap, btype, BList, BAList, OMap );
break;
default:
G_fatal_error (" Vect_overlay(): unknown operator" );
}
return 0;
}
/*!
\fn int Vect_overlay_and ( struct Map_info *AMap, int atype, struct ilist *AList, struct ilist *AAList,
struct Map_info *BMap, int btype, struct ilist *BList, struct ilist *BAList,
struct Map_info *OMap )
\brief overlay 2 vector maps with AND. AND supports: point line area
point + - +
line - - -
area + - -
\return 1 on success, 0 on error
\param AMap, atype, AList, AAList, BMap, btype, BList, BAList,
OMap )
*/
int
Vect_overlay_and ( struct Map_info *AMap, int atype, struct ilist *AList, struct ilist *AAList,
struct Map_info *BMap, int btype, struct ilist *BList, struct ilist *BAList,
struct Map_info *OMap )
{
int i, j, k, node, line, altype, bltype, oltype, area, centr;
struct line_pnts *Points;
struct line_cats *ACats, *BCats, *OCats;
struct ilist *AOList, *BOList;
/* TODO: support Lists */
Points = Vect_new_line_struct ();
ACats = Vect_new_cats_struct ();
BCats = Vect_new_cats_struct ();
OCats = Vect_new_cats_struct ();
AOList = Vect_new_list ();
BOList = Vect_new_list ();
/* TODO: support all types; at present only point x point, area x point and point x area supported */
if ( ( atype & GV_LINES ) || (btype & GV_LINES) )
G_warning ("overlay: line/boundary types not supported by AND operator");
if ( ( atype & GV_AREA ) && (btype & GV_AREA) )
G_warning ("overlay: area x area types not supported by AND operator");
/* TODO: more points in one node in one map */
/* point x point: select all points with identical coordinates in both maps */
if ( ( atype & GV_POINTS ) && (btype & GV_POINTS) ) { /* both points and centroids */
G_debug ( 3, "overlay: AND: point x point");
for ( i = 1; i <= Vect_get_num_lines ( AMap ); i++ ) {
altype = Vect_read_line ( AMap, Points, ACats, i);
if ( !(altype & GV_POINTS ) ) continue;
node = Vect_find_node ( BMap, Points->x[0], Points->y[0], Points->z[0], 0, 1);
G_debug ( 3, "overlay: node = %d", node);
if ( node == 0 ) continue;
Vect_reset_cats ( OCats );
for ( j = 0; j < Vect_get_node_n_lines ( BMap, node); j++ ) {
line = Vect_get_node_line ( BMap, node, j );
bltype = Vect_read_line ( BMap, NULL, BCats, line);
if ( !( bltype & GV_POINTS ) ) continue;
/* Identical points found -> write out */
/* TODO: do something if fields in ACats and BCats are identical */
for ( k = 0; k < ACats->n_cats; k++ )
Vect_cat_set (OCats, ACats->field[k], ACats->cat[k]);
for ( k = 0; k < BCats->n_cats; k++ )
Vect_cat_set (OCats, BCats->field[k], BCats->cat[k]);
/* TODO: what to do if one type is GV_POINT and second GV_CENTROID */
oltype = altype;
Vect_write_line ( OMap, oltype, Points, OCats );
Vect_list_append ( AOList, i); /* add to list of written lines */
Vect_list_append ( BOList, line);
break;
}
}
}
/* TODO: check only labeled areas */
/* point x area: select points from A in areas in B */
if ( ( atype & GV_POINTS ) && (btype & GV_AREA) ) { /* both points and centroids */
G_debug ( 3, "overlay: AND: point x area");
for ( i = 1; i <= Vect_get_num_lines ( AMap ); i++ ) {
altype = Vect_read_line ( AMap, Points, ACats, i);
if ( !(altype & GV_POINTS ) ) continue;
area = Vect_find_area ( BMap, Points->x[0], Points->y[0] );
if ( area == 0 ) continue;
Vect_reset_cats ( OCats );
/* TODO: do something if fields in ACats and BCats are identical */
for ( k = 0; k < ACats->n_cats; k++ )
Vect_cat_set (OCats, ACats->field[k], ACats->cat[k]);
centr = Vect_get_area_centroid ( BMap, area );
if ( centr > 0 ) {
bltype = Vect_read_line ( BMap, NULL, BCats, centr);
for ( k = 0; k < BCats->n_cats; k++ )
Vect_cat_set (OCats, BCats->field[k], BCats->cat[k]);
}
/* Check if not yet written */
if ( !(Vect_val_in_list ( AOList, i ) ) ) {
Vect_write_line ( OMap, altype, Points, OCats );
Vect_list_append ( AOList, i);
}
}
}
/* area x point: select points from B in areas in A */
if ( ( btype & GV_POINTS ) && (atype & GV_AREA) ) { /* both points and centroids */
G_debug ( 3, "overlay: AND: area x point");
for ( i = 1; i <= Vect_get_num_lines ( BMap ); i++ ) {
bltype = Vect_read_line ( BMap, Points, BCats, i);
if ( !(bltype & GV_POINTS ) ) continue;
area = Vect_find_area ( AMap, Points->x[0], Points->y[0] );
if ( area == 0 ) continue;
Vect_reset_cats ( OCats );
/* TODO: do something if fields in ACats and BCats are identical */
for ( k = 0; k < BCats->n_cats; k++ )
Vect_cat_set (OCats, BCats->field[k], BCats->cat[k]);
centr = Vect_get_area_centroid ( AMap, area );
if ( centr > 0 ) {
altype = Vect_read_line ( AMap, NULL, ACats, centr);
for ( k = 0; k < ACats->n_cats; k++ )
Vect_cat_set (OCats, ACats->field[k], ACats->cat[k]);
}
/* Check if not yet written */
if ( !(Vect_val_in_list ( BOList, i ) ) ) {
Vect_write_line ( OMap, bltype, Points, OCats );
Vect_list_append ( BOList, i);
}
}
}
return 0;
}
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