The area covered by the body.
- iOS 7.0+
- macOS 10.9+
- tvOS 9.0+
- watchOS 3.0+
This property is used in conjunction with the
density property to calculate the body’s mass.
The value returned for the area is measured in meters: if you need to convert it into points — as used by SpriteKit — multiply the values by 150². The following listing shows how to calculate the area of a box which is ten points square.