/**
* Checks, if p_item item is part of a cycle and remuve it together with its connection in this
* case.
*/
public boolean remove_if_cycle(Trace p_trace) {
if (!p_trace.is_on_the_board()) {
return false;
}
if (!p_trace.is_cycle()) {
return false;
}
// Remove tails at the endpoints after removing the cycle,
// if there was no tail before.
boolean[] tail_at_endpoint_before = null;
Point[] end_corners = null;
int curr_layer = p_trace.get_layer();
int[] curr_net_no_arr = p_trace.net_no_arr;
end_corners = new Point[2];
end_corners[0] = p_trace.first_corner();
end_corners[1] = p_trace.last_corner();
tail_at_endpoint_before = new boolean[2];
for (int i = 0; i < 2; ++i) {
Trace tail = get_trace_tail(end_corners[i], curr_layer, curr_net_no_arr);
tail_at_endpoint_before[i] = (tail != null);
}
Set<Item> connection_items = p_trace.get_connection_items();
this.remove_items(connection_items, false);
for (int i = 0; i < 2; ++i) {
if (!tail_at_endpoint_before[i]) {
Trace tail = get_trace_tail(end_corners[i], curr_layer, curr_net_no_arr);
if (tail != null) {
remove_items(tail.get_connection_items(), false);
}
}
}
return true;
}
