# `GSPath firstOncurveNodeIndex`

*Instance Method*

An index from which every segment can be traversed in node order.

## Declaration

```swift
func firstOncurveNodeIndex() -> Int
```

```objc
- (NSInteger) firstOncurveNodeIndex;
```

```python
firstOncurveNodeIndex() -> int
```

## Discussion

For a closed path, the index may be negative to include a segment crossing the array boundary.

Returns `0` for open paths and paths without on-curve nodes.

## See Also

### Node Navigation

- [`GSPath nodeAtIndex:`](/Core/GlyphsCore/GSPath/nodeAtIndex:) — The node at an index.
- [`GSPath indexOfNode:`](/Core/GlyphsCore/GSPath/indexOfNode:) — The index of a node, or `NSNotFound` when the node is not in the path.
- [`GSPath nextOncurveNodeFromIndex:`](/Core/GlyphsCore/GSPath/nextOncurveNodeFromIndex:) — The next on-curve node after an index.
- [`GSPath previousOncurveNodeFromIndex:`](/Core/GlyphsCore/GSPath/previousOncurveNodeFromIndex:) — The previous on-curve node before an index.
- [`GSPath.startNode`](/Core/GlyphsCore/GSPath/startNode) — For open paths, returns the first node of the path, otherwise `nil`.
- [`GSPath.endNode`](/Core/GlyphsCore/GSPath/endNode) — For open paths, returns the last node of the path, otherwise `nil`.
- [`GSPath findStartNode`](/Core/GlyphsCore/GSPath/findStartNode) — The node used to begin traversing a closed path, or `nil` for an open path.
- [`GSPath findMinNode`](/Core/GlyphsCore/GSPath/findMinNode) — The lowest on-curve node, preferring the leftmost node at equal height.
- [`GSPath fixStartNode`](/Core/GlyphsCore/GSPath/fixStartNode) — Moves trailing off-curve nodes to the beginning of a closed path.
- [`GSPath makeNodeFirst:`](/Core/GlyphsCore/GSPath/makeNodeFirst:) — Makes a node the start node of the path.
- [`GSPath indexOfTTStartNode`](/Core/GlyphsCore/GSPath/indexOfTTStartNode) — The index preceding the first on-curve node for TrueType path traversal.