The bouncing coefficient of this Disc.
The collision group of this Disc.
The collision mask of this Disc.
The color of this Disc. Range: -1 <= color < 16777216.
Utils.numberToColor function.-1 means transparent color.The damping value of this Disc.
The gravity of this Disc.
The 1/mass value of this Disc.
The position of this Disc.
The radius of this Disc.
The speed of this Disc.
The text id of this Disc. -1 = empty.
The texture id of this Disc. -1 = empty.
A class that defines a disc.