import * as box2 from './box2';
import type { Vec2, Vec2Like } from './types';
/** 2D bounding circle storage: Float32Array [centerX, centerY, radius]. */
export type Circle2 = Float32Array & {
    readonly __circle2: void;
};
/** Readable 2D bounding-circle input. */
export type Circle2Like = ArrayLike<number>;
/** Create a bounding circle. Negative radius is clamped to zero. */
export declare function create(cx?: number, cy?: number, radius?: number): Circle2;
/** Build a circle centered at the point-cloud AABB center and enclosing all points. */
export declare function fromPoints(out: Circle2, points: readonly Vec2Like[]): Circle2;
/** Build the smallest AABB containing the circle. */
export declare function toBox(out: box2.Box2, circle: Circle2Like): box2.Box2;
/** Write the circle center to out. */
export declare function center(out: Vec2, circle: Circle2Like): Vec2;
/** Return the circle radius. */
export declare function radius(circle: Circle2Like): number;
/** Write the closest point in the circle to point. */
export declare function closestPoint(out: Vec2, circle: Circle2Like, point: Vec2Like): Vec2;
/** True when point is inside the circle, including its boundary. */
export declare function containsPoint(circle: Circle2Like, point: Vec2Like): boolean;
/** True when two circles overlap, including tangent contact. */
export declare function intersectsCircle(a: Circle2Like, b: Circle2Like): boolean;
/** True when the circle overlaps the box, including tangent contact. */
export declare function intersectsBox(circle: Circle2Like, box: box2.Box2Like): boolean;
/** Return the smallest circle containing both circles. */
export declare function merge(out: Circle2, a: Circle2Like, b: Circle2Like): Circle2;
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