Returns the ID of the selected element.
(tpm_traceelemid trace_id type index)
Returns an element ID (real) or nil.
| trace_id | Tracing model ID (real) returned by tpm_tracealloc |
| type | Element type: 1 Node 2 Link |
| index | Element index. The first element's index is 0 |
This function returns the ID of the element selected. Use this function to find the trace result in the source topology after performing a trace with tpm_traceshort or tpm_traceflood.
This example performs a short path trace and gets the ID of the first link of the result path.
; open topology to trace (setq tpm_id (tpm_acopen "nettopo" nil)) ; create the model (setq trc_id (tpm_tracealloc tpm_id)) ; find shortest path (tpm_traceshort trc_id start_id end_id) ; number of links in path (setq qty (tpm_traceqty trc_id 2)) ; get first link of path (setq id (tpm_traceelemid trc_id 2 0))