Chipmunk circle collision shape type.
|center||Center of the circle relative to its transform.|
|radius||Radius of the circle relative to its transform.|
ChipmunkBody that this shape is attached to.
|friction||Friction value of this shape.|
|elasticity||Elasticity of this shapes|
|isSensor||Indicates if the shape is a sensor.|
|collisionType||String identifier that that is used for collision events.|
|group||String that identifies the group a collision shape is in.|
|layers||A bitmask of which Chipmunk layers a shape is in.|
|surfaceVelocity||The velocity of the surface of a shape separate from its rigid body's velocity.|