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GRASS 8 Programmer's Manual 8.6.0dev(2026)-f6f2c534ea
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Nviz library – Define creation and interface functions for map objects. More...

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Functions | |
| int | Nviz_new_map_obj (int type, const char *name, double value, nv_data *data) |
| Create a new map object which can be one of surf, vect, vol or site. | |
| int | Nviz_set_attr (int id, int type, int desc, int src, const char *str_value, double num_value, nv_data *data) |
| void | Nviz_set_surface_attr_default (void) |
| Set default surface attributes. | |
| int | Nviz_set_vpoint_attr_default (int id) |
| Set default vector point attributes. | |
| int | Nviz_set_volume_attr_default (int id) |
| Set default volume attributes. | |
| int | Nviz_unset_attr (int id, int type, int desc) |
Nviz library – Define creation and interface functions for map objects.
Map objects are considered to be surfaces, vector plots, or site files.
Based on visualization/nviz/src/map_obj.c
(C) 2008, 2010 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 map_obj.c.
Create a new map object which can be one of surf, vect, vol or site.
This routine creates the object internally in the gsf libraryb. Optionally, a logical name may be specified for the new map object. If no name is specified, a logical name is assigned to the new object automatically. Note that maintaining unique logical names is not the responsibility of the library (currently).
Initially map objects contain no data, use the attribute commands to set attributes such as topology, color, etc.
| type | map object type |
| name | map name (NULL for constant) |
| value | constant (used if name is NULL) |
| data | nviz data |
Definition at line 46 of file map_obj.c.
References _, ATT_TOPO, CONST_ATT, G_free(), G_warning(), GP_delete_site(), GP_load_site(), GP_new_site(), GP_num_sites(), GP_select_surf(), GP_set_style(), GS_get_surf_list(), GS_new_surface(), GS_num_surfs(), GV_delete_vector(), GV_load_vector(), GV_new_vector(), GV_num_vects(), GV_select_surf(), GV_set_style(), GVL_delete_vol(), GVL_load_vol(), GVL_new_vol(), GVL_num_vols(), MAP_ATT, MAP_OBJ_SITE, MAP_OBJ_SURF, MAP_OBJ_VECT, MAP_OBJ_VOL, MAX_SITES, MAX_SURFS, MAX_VECTS, MAX_VOLS, name, NULL, Nviz_set_attr(), Nviz_set_volume_attr_default(), Nviz_set_vpoint_attr_default(), and ST_X.
| int Nviz_set_attr | ( | int | id, |
| int | type, | ||
| int | desc, | ||
| int | src, | ||
| const char * | str_value, | ||
| double | num_value, | ||
| nv_data * | data | ||
| ) |
Set map object attribute
| id | map object id |
| type | map object type (MAP_OBJ_SURF, MAP_OBJ_VECT, ...) |
| desc | attribute descriptor |
| src | attribute source |
| str_value | attribute value as string (if NULL, check for num_value) |
| num_value | attribute value as double |
Definition at line 182 of file map_obj.c.
References ATT_COLOR, ATT_TOPO, CONST_ATT, DM_GOURAUD, DM_GRID_SURF, DM_POLY, FALLTHROUGH, GS_get_dims(), GS_load_att_map(), GS_set_att_const(), GS_set_drawmode(), GS_set_drawres(), MAP_ATT, MAP_OBJ_SURF, max, and Nviz_update_ranges().
Referenced by Nviz_new_map_obj().
Set default surface attributes.
Definition at line 279 of file map_obj.c.
References ATT_COLOR, ATT_EMIT, ATT_MASK, ATT_SHINE, ATT_TOPO, ATT_TRANSP, DEFAULT_SURF_COLOR, GS_set_att_defaults(), and MAX_ATTS.
Set default volume attributes.
| id | volume set id |
Definition at line 323 of file map_obj.c.
References DM_GOURAUD, DM_POLY, GVL_get_dims(), GVL_isosurf_set_drawmode(), GVL_isosurf_set_drawres(), GVL_slice_set_drawmode(), GVL_slice_set_drawres(), and max.
Referenced by Nviz_new_map_obj().
Set default vector point attributes.
| id | vector point set id |
Definition at line 303 of file map_obj.c.
References gp_get_site().
Referenced by Nviz_new_map_obj().
Unset map object attribute
| id | map object id |
| type | map object type (MAP_OBJ_SURF, MAP_OBJ_VECT, ...) |
| desc | attribute descriptor |
Definition at line 363 of file map_obj.c.
References GS_unset_att(), and MAP_OBJ_SURF.