Unity - Scripting API:

public static function GetAspectRect(aspect: float): Rect;

public static Rect GetAspectRect(float aspect);

public static function GetAspectRect(aspect: float, style: GUIStyle): Rect;

public static Rect GetAspectRect(float aspect, GUIStyle style);

public static function GetAspectRect(aspect: float, params options: GUILayoutOption[]): Rect;

public static Rect GetAspectRect(float aspect, params GUILayoutOption[] options);

public static function GetAspectRect(aspect: float, style: GUIStyle, params options: GUILayoutOption[]): Rect;

public static Rect GetAspectRect(float aspect, GUIStyle style, params GUILayoutOption[] options);

Parameters

aspect	The aspect ratio of the element (width / height).
style	An optional style. If specified, the style's `padding` value will be added to the sizes of the returned rectangle & the style's `margin` values will be used for spacing.
options	An optional list of layout options that specify extra layouting properties. Any values passed in here will override settings defined by the `style`. See Also: GUILayout.Width, GUILayout.Height, GUILayout.MinWidth, GUILayout.MaxWidth, GUILayout.MinHeight, GUILayout.MaxHeight, GUILayout.ExpandWidth, GUILayout.ExpandHeight.

Rect The rect for the control.

Reserve layout space for a rectangle with a specific aspect ratio.