GRASS GIS 8 Programmer's Manual
8.2.2dev(2023)5c00b4e944

Vector library  related fns for vector network analyses. More...
Go to the source code of this file.
Functions  
int  Vect_net_ttb_shortest_path (struct Map_info *Map, int from, int from_type, int to, int to_type, int tucfield, struct ilist *List, double *cost) 
Find shortest path on network. More...  
int  Vect_net_shortest_path (struct Map_info *Map, int from, int to, struct ilist *List, double *cost) 
Find shortest path. More...  
dglGraph_s *  Vect_net_get_graph (struct Map_info *Map) 
Get graph structure. More...  
int  Vect_net_get_line_cost (const struct Map_info *Map, int line, int direction, double *cost) 
Returns in cost for given direction in *cost. More...  
int  Vect_net_get_node_cost (const struct Map_info *Map, int node, double *cost) 
Get cost of node. More...  
int  Vect_net_nearest_nodes (struct Map_info *Map, double x, double y, double z, int direction, double maxdist, int *node1, int *node2, int *ln, double *costs1, double *costs2, struct line_pnts *Points1, struct line_pnts *Points2, double *distance) 
Find nearest node(s) on network. More...  
int  Vect_net_shortest_path_coor (struct Map_info *Map, double fx, double fy, double fz, double tx, double ty, double tz, double fmax, double tmax, double *costs, struct line_pnts *Points, struct ilist *List, struct ilist *NodesList, struct line_pnts *FPoints, struct line_pnts *TPoints, double *fdist, double *tdist) 
Find shortest path on network between 2 points given by coordinates. More...  
int  Vect_net_ttb_shortest_path_coor (struct Map_info *Map, double fx, double fy, double fz, double tx, double ty, double tz, double fmax, double tmax, int tucfield, double *costs, struct line_pnts *Points, struct ilist *List, struct ilist *NodesList, struct line_pnts *FPoints, struct line_pnts *TPoints, double *fdist, double *tdist) 
Find shortest path on network with turntable between 2 points given by coordinates. More...  
Vector library  related fns for vector network analyses.
Higher level functions for reading/writing/manipulating vectors.
(C) 20012009, 2014 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.
Definition in file net_analyze.c.
dglGraph_s* Vect_net_get_graph  (  struct Map_info *  Map  ) 
Get graph structure.
Graph is built by Vect_net_build_graph().
Returns NULL when graph is not built.
Map  pointer to Map_info struct 
Definition at line 393 of file net_analyze.c.
References Map_info::dgraph, and Graph_info::graph_s.
int Vect_net_get_line_cost  (  const struct Map_info *  Map, 
int  line,  
int  direction,  
double *  cost  
) 
Returns in cost for given direction in *cost.
cost is set to 1 if closed.
Map  vector map with build graph (see Vect_net_ttb_build_graph and Vect_net_build_graph)  
line  line id  
direction  direction (GV_FORWARD, GV_BACKWARD)  
[out]  cost 
Definition at line 412 of file net_analyze.c.
int Vect_net_get_node_cost  (  const struct Map_info *  Map, 
int  node,  
double *  cost  
) 
Get cost of node.
Map  vector map with build graph (see Vect_net_ttb_build_graph and Vect_net_build_graph)  
node  node id  
[out]  cost  costs value 
Definition at line 467 of file net_analyze.c.
References Map_info::dgraph, G_debug(), and Graph_info::node_costs.
int Vect_net_nearest_nodes  (  struct Map_info *  Map, 
double  x,  
double  y,  
double  z,  
int  direction,  
double  maxdist,  
int *  node1,  
int *  node2,  
int *  ln,  
double *  costs1,  
double *  costs2,  
struct line_pnts *  Points1,  
struct line_pnts *  Points2,  
double *  distance  
) 
Find nearest node(s) on network.
Map  vector map with build graph (see Vect_net_ttb_build_graph and Vect_net_build_graph)  
x,y,z  point coordinates (z coordinate NOT USED !)  
direction  (GV_FORWARD  from point to net, GV_BACKWARD  from net to point)  
maxdist  maximum distance to the network  
[out]  node1  pointer where to store the node number (or NULL) 
[out]  node2  pointer where to store the node number (or NULL) 
[out]  ln  pointer where to store the nearest line number (or NULL) 
[out]  costs1  pointer where to store costs on nearest line to node1 (not costs from x,y,z to the line) (or NULL) 
[out]  costs2  pointer where to store costs on nearest line to node2 (not costs from x,y,z to the line) (or NULL) 
[out]  Points1  pointer to structure where to store vertices on nearest line to node1 (or NULL) 
[out]  Points2  pointer to structure where to store vertices on nearest line to node2 (or NULL) 
[out]  pointer  where to distance to the line (or NULL) 
[out]  distance 
Definition at line 497 of file net_analyze.c.
int Vect_net_shortest_path  (  struct Map_info *  Map, 
int  from,  
int  to,  
struct ilist *  List,  
double *  cost  
) 
Find shortest path.
Costs for 'from' and 'to' nodes are not considered (SP found even if 'from' or 'to' are 'closed' (costs = 1) and costs of these nodes are not added to SP costs result.
Map  vector map with build graph (see Vect_net_ttb_build_graph and Vect_net_build_graph)  
from  from node  
to  to node  
[out]  List  list of line ids (path) 
[out]  cost  costs value 
Definition at line 376 of file net_analyze.c.
int Vect_net_shortest_path_coor  (  struct Map_info *  Map, 
double  fx,  
double  fy,  
double  fz,  
double  tx,  
double  ty,  
double  tz,  
double  fmax,  
double  tmax,  
double *  costs,  
struct line_pnts *  Points,  
struct ilist *  List,  
struct ilist *  NodesList,  
struct line_pnts *  FPoints,  
struct line_pnts *  TPoints,  
double *  fdist,  
double *  tdist  
) 
Find shortest path on network between 2 points given by coordinates.
Map  vector map with build graph (see Vect_net_ttb_build_graph and Vect_net_build_graph) 
fx,fy,fz  from point x coordinate (z ignored) 
tx,ty,tz  to point x coordinate (z ignored) 
fmax  maximum distance to the network from 'from' 
tmax  maximum distance to the network from 'to' 
costs  pointer where to store costs on the network (or NULL) 
Points  pointer to the structure where to store vertices of shortest path (or NULL) 
List  pointer to the structure where list of lines on the network is stored (or NULL) 
NodesList  pointer to the structure where list of nodes on the network is stored (or NULL) 
FPoints  pointer to the structure where to store line from 'from' to first network node (or NULL) 
TPoints  pointer to the structure where to store line from last network node to 'to' (or NULL) 
fdist  distance from 'from' to the net (or NULL) 
tdist  distance from 'to' to the net (or NULL) 
Definition at line 1023 of file net_analyze.c.
int Vect_net_ttb_shortest_path  (  struct Map_info *  Map, 
int  from,  
int  from_type,  
int  to,  
int  to_type,  
int  tucfield,  
struct ilist *  List,  
double *  cost  
) 
Find shortest path on network.
Costs for 'from' and 'to' nodes are not considered (SP found even if 'from' or 'to' are 'closed' (costs = 1) and costs of these nodes are not added to SP costs result.
Map  vector map with build graph (see Vect_net_ttb_build_graph and Vect_net_build_graph)  
from  start of the path  
from_type  if 0  node id (intersection), if 1  line unique cat  
to  end of the path  
to_type  if 0  node id (intersection), if 1  line unique cat  
tucfield  field with unique categories used in the turntable  
[out]  List  list of line ids (path) 
[out]  cost  costs value 
Definition at line 254 of file net_analyze.c.
int Vect_net_ttb_shortest_path_coor  (  struct Map_info *  Map, 
double  fx,  
double  fy,  
double  fz,  
double  tx,  
double  ty,  
double  tz,  
double  fmax,  
double  tmax,  
int  tucfield,  
double *  costs,  
struct line_pnts *  Points,  
struct ilist *  List,  
struct ilist *  NodesList,  
struct line_pnts *  FPoints,  
struct line_pnts *  TPoints,  
double *  fdist,  
double *  tdist  
) 
Find shortest path on network with turntable between 2 points given by coordinates.
Map  vector map with build graph (see Vect_net_ttb_build_graph and Vect_net_build_graph) 
fx,fy,fz  from point x coordinate (z ignored) 
tx,ty,tz  to point x coordinate (z ignored) 
fmax  maximum distance to the network from 'from' 
tmax  maximum distance to the network from 'to' 
tucfield  field with unique categories used in the turntable 
costs  pointer where to store costs on the network (or NULL) 
Points  pointer to the structure where to store vertices of shortest path (or NULL) 
List  pointer to the structure where list of lines on the network is stored (or NULL) 
NodesList  pointer to the structure where list of nodes on the network is stored (or NULL) 
FPoints  pointer to the structure where to store line from 'from' to first network node (or NULL) 
TPoints  pointer to the structure where to store line from last network node to 'to' (or NULL) 
fdist  distance from 'from' to the net (or NULL) 
tdist  distance from 'to' to the net (or NULL) 
Definition at line 1058 of file net_analyze.c.