/**
 * Represents a circle.
 */ export class Circle { /**
     * The x-coordinate of the circle.
     */ x : number ; /**
     * The y-coordinate of the circle.
     */ y : number ; defaultValue radius : number ; /**
     * Creates a new circle at the specified coordinates, with a default radius of 0.
     */ constructor ( x , y , radius = 0 ) { this . x = x ; this . y = y ; this . radius = radius ; } public static readonly zero = new Circle ( 0 , 0 ) ; }