# Common Value Types

FontParts scripts are built on with objects that represent fonts, glyphs, contours and so on. The objects are obtained through fontparts-world.

FontParts uses some common value types.

## String

Unicode (unencoded) or string. Internally everything is a unicode string.

## Integer/Float

Integers and floats are interchangeable in FontParts (unless the specification states that only one is allowed).

## Coordinate

An immutable iterable containing two Integer/Float representing:

1. x

2. y

## Angle

XXX define the angle specifications here. Direction, degrees, etc. This will always be a float.

## Identifier

A String following the UFO identifier conventions.

## Color

An immutable iterable containing four Integer/Float representing:

1. red

2. green

3. blue

4. alpha

Values are from 0 to 1.0.

## Transformation Matrix

An immutable iterable defining a 2x2 transformation plus offset (aka Affine transform). The default is `(1, 0, 0, 1, 0, 0)`.

## Immutable List

This must be an immutable, ordered iterable like a `tuple`.

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