Editing Example db walk tree
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This is a simple example program that shows how to walk a geometry database while performing some operation on geometry as it is encountered. In this particular example, we iterate just over regions and simply count them: | This is a simple example program that shows how to walk a geometry database while performing some operation on geometry as it is encountered. In this particular example, we iterate just over regions and simply count them: | ||
| − | < | + | <source lang="C"> |
| + | |||
#include "common.h" | #include "common.h" | ||
#include "raytrace.h" | #include "raytrace.h" | ||
| − | int incr_region( | + | int incr_region(struct db_tree_state *tsp, struct db_full_path *pathp, const struct rt_comb_internal *combp, void *data) |
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{ | { | ||
int *counter = (int*)data; | int *counter = (int*)data; | ||
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bu_log("Database title is:\n%s\n", dbip->dbi_title); | bu_log("Database title is:\n%s\n", dbip->dbi_title); | ||
| − | //bu_log("Units: %s\n", bu_units_string(dbip->dbi_local2base)); | + | // bu_log("Units: %s\n", bu_units_string(dbip->dbi_local2base)); |
if (db_lookup(dbip, argv[2], 1) == NULL) { | if (db_lookup(dbip, argv[2], 1) == NULL) { | ||
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db_walk_tree(dbip, 1, (const char **)argv+2, 1, &state, incr_region, NULL, NULL, &counter); | db_walk_tree(dbip, 1, (const char **)argv+2, 1, &state, incr_region, NULL, NULL, &counter); | ||
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bu_log("counter is %d\n", counter); | bu_log("counter is %d\n", counter); | ||
return 0; | return 0; | ||
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} | } | ||
| − | </ | + | </source> |
If we compile this program and run it on a sample geometry database, we get the following: | If we compile this program and run it on a sample geometry database, we get the following: | ||
| − | < | + | <source lang="bash"> |
# you may need to replace /usr/brlcad with the path to where BRL-CAD is installed on your system | # you may need to replace /usr/brlcad with the path to where BRL-CAD is installed on your system | ||
$ gcc -o db_walk_tree_example -I/usr/brlcad/include -I/usr/brlcad/include/brlcad db_walk_tree_example.c -L/usr/brlcad/lib -lrt -lbu | $ gcc -o db_walk_tree_example -I/usr/brlcad/include -I/usr/brlcad/include/brlcad db_walk_tree_example.c -L/usr/brlcad/lib -lrt -lbu | ||
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...incrementing... | ...incrementing... | ||
counter is 83 | counter is 83 | ||
| − | </ | + | </source> |
