import { UILayer } from "../layers/UILayer/UILayer";
/** Objects that belong to a UI layer */
export interface UILayerElement {
    /** The UI layer containing this element */
    readonly layer: UILayer;
}
/** UI elements with position in 2D space */
export interface UIPointElement {
    /** Solver variable for x coordinate */
    readonly xVariable: number;
    /** Solver variable for y coordinate */
    readonly yVariable: number;
    /** X coordinate in world units */
    readonly x: number;
    /** Y coordinate in world units */
    readonly y: number;
}
/** UI elements with position and dimensions */
export interface UIPlaneElement extends UIPointElement {
    /** Solver variable for width */
    readonly wVariable: number;
    /** Solver variable for height */
    readonly hVariable: number;
    /** Width in world units */
    readonly width: number;
    /** Height in world units */
    readonly height: number;
    /** Opposite X coordinate in world units */
    readonly oppositeX: number;
    /** Opposite Y coordinate in world units */
    readonly oppositeY: number;
    /** Center X coordinate in world units */
    readonly centerX: number;
    /** Center Y coordinate in world units */
    readonly centerY: number;
}
/**
 * Checks if object implements UILayerElement.
 * @param obj Object to check
 * @returns True if object has valid layer property
 */
export declare function isUILayerElement(obj: unknown): obj is UILayerElement;
/**
 * Checks if object implements UIPointElement.
 * @param obj Object to check
 * @returns True if object has valid position variables
 */
export declare function isUIPointElement(obj: unknown): obj is UIPointElement;
/**
 * Checks if object implements UIPlaneElement.
 * @param obj Object to check
 * @returns True if object has valid dimension variables
 */
export declare function isUIPlaneElement(obj: unknown): obj is UIPlaneElement;