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: | ||
| − | <pre | + | <pre> |
#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, genptr_t data) |
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| − | |||
| − | |||
| − | |||
{ | { | ||
int *counter = (int*)data; | int *counter = (int*)data; | ||
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} | } | ||
| − | int main(int argc, char *argv[]){ | + | int |
| − | + | main(int argc, char *argv[]) | |
| + | { | ||
struct db_i *dbip; | struct db_i *dbip; | ||
int counter = 0; | int counter = 0; | ||
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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)); | |
if (db_lookup(dbip, argv[2], 1) == NULL) { | if (db_lookup(dbip, argv[2], 1) == NULL) { | ||
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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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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: | ||
| − | <pre | + | <pre> |
| − | + | $ gcc db_walk_tree_example.c -L/usr/brlcad/lib -lrt -lbu -I/usr/brlcad/include -I/usr/brlcad/include/brlcad | |
| − | + | $ ./a.out db/ktank.g tank | |
| − | |||
| − | $ ./ | ||
Database title is: | Database title is: | ||
Keith's Tank | Keith's Tank | ||
| − | + | Units: in | |
...incrementing... | ...incrementing... | ||
<... trimmed output ...> | <... trimmed output ...> | ||
...incrementing... | ...incrementing... | ||
| − | counter is | + | counter is 80 |
</pre> | </pre> | ||
