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get_ancestor

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This commit is contained in:
David Rose 2008-10-28 21:35:48 +00:00
parent 2a6a39dd4a
commit d2c5866507
2 changed files with 39 additions and 1 deletions
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39
panda/src/pgraph/nodePath.cxx
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@ -98,6 +98,9 @@ get_num_nodes(Thread *current_thread) const {
// return the same thing as get_node(0) (since the
// bottom node is the most important node in the
// NodePath, and is the one most frequently referenced).
//
// Note that this function returns the same thing as
// get_ancestor(index).node().
////////////////////////////////////////////////////////////////////
PandaNode *NodePath::
get_node(int index, Thread *current_thread) const {
@ -120,6 +123,40 @@ get_node(int index, Thread *current_thread) const {
return comp->get_node();
}
////////////////////////////////////////////////////////////////////
// Function: NodePath::get_ancestor
// Access: Published
// Description: Returns the nth ancestor of the path, where 0 is the
// NodePath itself and get_num_nodes() - 1 is get_top().
// This requires iterating through the path.
//
// Also see get_node(), which returns the same thing as
// a PandaNode pointer, not a NodePath.
////////////////////////////////////////////////////////////////////
NodePath NodePath::
get_ancestor(int index, Thread *current_thread) const {
nassertr(index >= 0 && index < get_num_nodes(), NodePath::fail());
int pipeline_stage = current_thread->get_pipeline_stage();
NodePathComponent *comp = _head;
while (index > 0) {
// If this assertion fails, the index was out of range; the
// component's length must have been invalid.
nassertr(comp != (NodePathComponent *)NULL, NodePath::fail());
comp = comp->get_next(pipeline_stage, current_thread);
index--;
}
// If this assertion fails, the index was out of range; the
// component's length must have been invalid.
nassertr(comp != (NodePathComponent *)NULL, NodePath::fail());
NodePath result;
result._head = comp;
return result;
}
////////////////////////////////////////////////////////////////////
// Function: NodePath::get_top
// Access: Published
@ -137,7 +174,7 @@ get_top(Thread *current_thread) const {
NodePathComponent *comp = _head;
while (!comp->is_top_node(pipeline_stage, current_thread)) {
comp = comp->get_next(pipeline_stage, current_thread);
nassertr(comp != (NodePathComponent *)NULL, NULL);
nassertr(comp != (NodePathComponent *)NULL, NodePath::fail());
}
NodePath top;

1
panda/src/pgraph/nodePath.h
View File

@ -180,6 +180,7 @@ PUBLISHED:
INLINE bool is_singleton(Thread *current_thread = Thread::get_current_thread()) const;
int get_num_nodes(Thread *current_thread = Thread::get_current_thread()) const;
PandaNode *get_node(int index, Thread *current_thread = Thread::get_current_thread()) const;
NodePath get_ancestor(int index, Thread *current_thread = Thread::get_current_thread()) const;
INLINE ErrorType get_error_type() const;