/** Screen rectangles shared by reference-tag drawing and interaction. */
export interface TagRect {
    x: number;
    y: number;
    w: number;
    h: number;
}
export interface ReferenceTag extends TagRect {
    index: number;
    lineId?: string;
    key: string;
    kind: "name" | "value" | "custom";
    /** Original projected price Y; displacement never changes the price. */
    lineY: number;
}
export interface StackedReferenceTag extends ReferenceTag {
    offsetY: number;
}
export interface ReferenceTagStack {
    offsets: number[];
    valueOffsets: number[];
    tags: StackedReferenceTag[];
}
export declare const EMPTY_TAG_STACK: ReferenceTagStack;
export declare function overlapsX(a: TagRect, b: TagRect): boolean;
/**
 * Pack only horizontally intersecting columns. Opposite edges stay independent.
 * A fixed value-badge obstacle divides a column into above/below slots; choose
 * the feasible split with the smallest total squared displacement. If there is
 * physically insufficient height, retain every tag in bounds with best-effort
 * spacing rather than hiding levels or moving their prices.
 */
export declare function stackReferenceTags(input: ReferenceTag[], top: number, bottom: number, radius?: number, obstacle?: TagRect | null): ReferenceTagStack;
/** Exact rectangles beat inflated targets when adjacent tags have a small gap. */
export declare function stackedTagAt(tags: StackedReferenceTag[], x: number, y: number): StackedReferenceTag | null;
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