lib/pixi/src/core/math/shapes/Circle.js
function Circle(x, y, radius)
{
    /**
     * @member {number}
     * @default 0
     */
    this.x = x || 0;

    /**
     * @member {number}
     * @default 0
     */
    this.y = y || 0;

    /**
     * @member {number}
     * @default 0
     */
    this.radius = radius || 0;

    /**
     * The type of the object, mainly used to avoid `instanceof` checks
     *
     * @member {number}
     */
    this.type = CONST.SHAPES.CIRC;
}
function Circle(x, y, radius)
{
    /**
     * @member {number}
     * @default 0
     */
    this.x = x || 0;

    /**
     * @member {number}
     * @default 0
     */
    this.y = y || 0;

    /**
     * @member {number}
     * @default 0
     */
    this.radius = radius || 0;

    /**
     * The type of the object, mainly used to avoid `instanceof` checks
     *
     * @member {number}
     */
    this.type = CONST.SHAPES.CIRC;
}
function Circle ( x , y , radius ) { /**
     * @member {number}
     * @default 0
     */ this . x = x || 0 ; /**
     * @member {number}
     * @default 0
     */ this . y = y || 0 ; /**
     * @member {number}
     * @default 0
     */ this . radius = radius || 0 ; /**
     * The type of the object, mainly used to avoid `instanceof` checks
     *
     * @member {number}
     */ this . type = CONST . SHAPES . CIRC ; }
The Circle object can be used to specify a hit area for displayObjects

@class
@memberof PIXI
@param x {number} The X coordinate of the center of this circle
@param y {number} The Y coordinate of the center of this circle
@param radius {number} The radius of the circle
The Circle object can be used to specify a hit area for displayObjects