import { Rect } from "../../Core/Rect";
import { RegionData } from "../../Core/RegionData";
import { ILineSegment } from "../../Interface/ILineSegment";
import { IRegionCallbacks } from "../../Interface/IRegionCallbacks";
import { RegionComponent } from "./RegionComponent";
/**
 * Component to represent mid-points along line segments in a region.
 */
export declare abstract class MidpointComponent extends RegionComponent {
    /**
     * Default (visual) radius for midpoints.
     */
    static DEFAULT_RADIUS: number;
    /**
     * Midpoint elements mapped to line segment indices.
     */
    protected midpointElements: Record<number, Snap.Element>;
    /**
     * Grouping element for midpoints.
     */
    protected midpointNode: Snap.Element;
    /**
     * Creates a new `MidpointComponent` object.
     * @param paper - The `Snap.Paper` object to draw on.
     * @param paperRect - The parent bounding box for created component.
     * @param regionData - The `RegionData` object shared across components. Used also for initial setup.
     * @param callbacks - The external callbacks collection.
     */
    constructor(paper: Snap.Paper, paperRect: Rect, regionData: RegionData, callbacks: IRegionCallbacks);
    redraw(): void;
    /**
     * Add event listeners to a midpoint's DOM node
     */
    protected abstract subscribeMidpointToEvents(midpoint: Snap.Element, index: number): void;
    /**
     * Helper function to create a new midpoint.
     * @param paper - The `Snap.Paper` object to draw on.
     * @param x - The `x`-coordinate of the midpoint.
     * @param y - The `y`-coordinate of the midpoint.
     * @param style - Additional css style class to be applied.
     * @param r - The radius of the midpoint.
     */
    protected createMidpoint(paper: Snap.Paper, x: number, y: number, style?: string, r?: number): Snap.Element;
    protected teardownMidpoints(): void;
    protected buildMidpoints(regionLineSegments: ILineSegment[]): void;
    private updateMidpoints;
}