# GSLayer Guides

*API Collection*

Layer-local guides used while editing outlines.

## Overview

Layer guides belong to one layer. Global guides belong to a font master and are not stored on a layer.

## Topics

- [`GSGuide`](/Core/GlyphsCore/GSGuide) — A guide used to align and measure outlines while editing.

### Guides

- [`GSLayer.guides`](/Core/GlyphsCore/GSLayer/guides) — Layer-local guides.
- [`GSLayer countOfGuides`](/Core/GlyphsCore/GSLayer/countOfGuides) — The number of layer-local guides.
- [`GSLayer objectInGuidesAtIndex:`](/Core/GlyphsCore/GSLayer/objectInGuidesAtIndex:) — The guide at an index.
- [`GSLayer indexOfObjectInGuides:`](/Core/GlyphsCore/GSLayer/indexOfObjectInGuides:) — The index of a guide in the layer.
- [`GSLayer addGuide:`](/Core/GlyphsCore/GSLayer/addGuide:) — Adds a guide.
- [`GSLayer insertObject:inGuidesAtIndex:`](/Core/GlyphsCore/GSLayer/insertObject:inGuidesAtIndex:) — Inserts a guide at an index.
- [`GSLayer removeObjectFromGuides:`](/Core/GlyphsCore/GSLayer/removeObjectFromGuides:) — Removes a guide.
- [`GSLayer removeObjectFromGuidesAtIndex:`](/Core/GlyphsCore/GSLayer/removeObjectFromGuidesAtIndex:) — Removes the guide at an index.

## See Also

- [GSLayer Kind](/Core/GlyphsCore/GSLayer-Kind) — The different roles that a layer can serve.
- [GSLayer Shapes](/Core/GlyphsCore/GSLayer-Shapes) — The paths and components that form the outline of a layer.
- [GSLayer Bounds](/Core/GlyphsCore/GSLayer-Bounds) — Bounding rectangles of outlines, selections, and metrics.
- [GSLayer Metrics](/Core/GlyphsCore/GSLayer-Metrics) — Side bearings, baseline offsets, layer box, and metrics keys.
- [GSLayer Grid](/Core/GlyphsCore/GSLayer-Grid) — Setting for rounding coordinates on a layer.
- [GSLayer Background](/Core/GlyphsCore/GSLayer-Background) — Background content and reference images associated with a layer.
- [GSLayer Anchors](/Core/GlyphsCore/GSLayer-Anchors) — Named attachment points on a layer.
- [GSLayer Hints](/Core/GlyphsCore/GSLayer-Hints) — Manual and generated hint data on a layer.
- [GSLayer Kerning](/Core/GlyphsCore/GSLayer-Kerning) — Spacing adjustment between specific layers.
- [GSLayer Annotations](/Core/GlyphsCore/GSLayer-Annotations) — Layer-local notes displayed with a glyph.
- [GSLayer Interpolation](/Core/GlyphsCore/GSLayer-Interpolation) — Axis coordinates and rules that place layers in a design space.
- [GSLayer Color](/Core/GlyphsCore/GSLayer-Color) — Colors used to draw a layer.
- [GSLayer Attributes](/Core/GlyphsCore/GSLayer-Attributes) — Additional values stored for a layer.
- [GSLayer Inspection](/Core/GlyphsCore/GSLayer-Inspection) — Intersections between layer outlines and line segments.
- [GSLayer Editing](/Core/GlyphsCore/GSLayer-Editing) — Operations for modifying outlines and other layer content.