export interface ScreenRect {
    minX: number;
    minY: number;
    maxX: number;
    maxY: number;
}
export interface ScreenPoint {
    id: string;
    x: number;
    y: number;
}
/** Normalize two drag corners (in any order) into a rectangle. */
export declare function screenRect(ax: number, ay: number, bx: number, by: number): ScreenRect;
export declare function rectContainsPoint(rect: ScreenRect, x: number, y: number): boolean;
/** Ids of the projected candidates whose screen point falls inside the marquee. */
export declare function selectWithinRect(candidates: readonly ScreenPoint[], rect: ScreenRect): string[];
/** True when the drag is large enough to be a marquee rather than a click. */
export declare function isMarquee(rect: ScreenRect, thresholdPx?: number): boolean;
export interface SelectionSet {
    add(id: string): void;
    remove(id: string): void;
    toggle(id: string): void;
    has(id: string): boolean;
    replace(ids: Iterable<string>): void;
    clear(): void;
    list(): string[];
    size(): number;
}
/** An ordered, deduplicated set of selected instance ids for RTS unit-command routing. */
export declare function createSelectionSet(initial?: Iterable<string>): SelectionSet;