# `GSInterpolationFontProxy kerningForFontMasterID:firstGlyph:secondGlyph:direction:`

*Instance Method*

## Declaration

```swift
func kerning(forFontMasterID fontMasterID: String, firstGlyph: GSGlyph, secondGlyph: GSGlyph, direction: GSWritingDirection) -> CGFloat
```

```objc
- (CGFloat) kerningForFontMasterID:(NSString *) fontMasterID firstGlyph:(GSGlyph *) firstGlyph secondGlyph:(GSGlyph *) secondGlyph direction:(GSWritingDirection) direction;
```

```python
kerningForFontMasterID_firstGlyph_secondGlyph_direction_(fontMasterID: str, firstGlyph: GSGlyph, secondGlyph: GSGlyph, direction: GSWritingDirection) -> float
```