GRASS GIS 8 Programmer's Manual  8.4.0dev(2024)-55b2a2bccc
utils.c File Reference

Network Analysis library - utils. More...

#include <stdio.h>
#include <stdlib.h>
#include <grass/gis.h>
#include <grass/vector.h>
#include <grass/glocale.h>
#include <grass/dbmi.h>
#include <grass/neta.h>
Include dependency graph for utils.c:

Go to the source code of this file.


void NetA_add_point_on_node (struct Map_info *In, struct Map_info *Out, int node, struct line_cats *Cats)
 Writes point. More...
void NetA_points_to_nodes (struct Map_info *In, struct ilist *point_list)
 Finds node. More...
int NetA_get_node_costs (struct Map_info *In, int layer, char *column, int *node_costs)
 Get node cost. More...
void NetA_varray_to_nodes (struct Map_info *map, struct varray *varray, struct ilist *nodes, int *nodes_to_features)
 Get list of nodes from varray. More...
int NetA_initialise_varray (struct Map_info *In, int layer, int mask_type, char *where, char *cat, struct varray **varray)
 Initialize varray. More...

Detailed Description

Network Analysis library - utils.

Utils subroutines.

(C) 2009-2010 by Daniel Bundala, and 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.

Daniel Bundala (Google Summer of Code 2009)

Definition in file utils.c.

Function Documentation

◆ NetA_add_point_on_node()

void NetA_add_point_on_node ( struct Map_info In,
struct Map_info Out,
int  node,
struct line_cats Cats 

Writes point.

Writes GV_POINT to Out at the position of the node in In.

Inpointer to Map_info structure (input vector map)
[in,out]Outpointer to Map_info structure (output vector map)
nodenode id
Catspointer to line_cats structures

Definition at line 34 of file utils.c.

◆ NetA_get_node_costs()

int NetA_get_node_costs ( struct Map_info In,
int  layer,
char *  column,
int *  node_costs 

Get node cost.

For each node in the map, finds the category of the point on it (if there is any) and stores the value associated with this category in the array node_costs. If there is no point with a category, node_costs=0.

node_costs are multiplied by the graph's cost multiplier and truncated to integers (as is done in Vect_net_build_graph)

Inpointer to Map_info structure
layerlayer number
columnname of column
[out]node_costslist of node costs
1 on success
0 on failure

Definition at line 106 of file utils.c.

◆ NetA_initialise_varray()

int NetA_initialise_varray ( struct Map_info In,
int  layer,
int  mask_type,
char *  where,
char *  cat,
struct varray **  varray 

Initialize varray.

Inpointer to Map_info structure
layerlayer number
wherewhere statement
[out]pointerto varray structure
number of items set
-1 on error

Definition at line 231 of file utils.c.

References _, line_cats::cat, G_fatal_error(), G_warning(), NULL, Vect_cat_get(), Vect_destroy_cats_struct(), Vect_get_num_lines(), Vect_new_cats_struct(), Vect_new_varray(), Vect_read_line(), Vect_set_varray_from_cat_string(), and Vect_set_varray_from_db().

◆ NetA_points_to_nodes()

void NetA_points_to_nodes ( struct Map_info In,
struct ilist point_list 

Finds node.

Find the node corresponding to each point in the point_list

Inpointer to Map_info structure
point_listlist of points (their ids)

Definition at line 73 of file utils.c.

◆ NetA_varray_to_nodes()

void NetA_varray_to_nodes ( struct Map_info map,
struct varray varray,
struct ilist nodes,
int *  nodes_to_features 

Get list of nodes from varray.

Returns the list of all nodes on features selected by varray. nodes_to_features contains the index of a feature adjacent to each node or -1 if no such feature specified by varray exists. Nodes_to_features might be NULL, in which case it is left unitialised. Nodes_to_features will be wrong if several lines connect to the same node.

mappointer to Map_info structure
varraypointer to varray structure
[out]nodeslist of node ids
[out]nodes_to_featuresmaps nodes to features

Definition at line 175 of file utils.c.