import { Geometry, Point } from "../../internal";
/**
 * Calculate the centroid from surface based geometries. Implementation based on
 * the JTS (Java Topology Suite) CentroidArea.
 */
export declare class CentroidSurface {
    /**
     * Base point for triangles
     */
    private _base;
    /**
     * Area sum
     */
    private _area;
    /**
     * Sum of surface point locations
     */
    private _sum;
    constructor();
    constructor(geometry: Geometry);
    /**
     * Add a surface based dimension 2 geometry to the centroid total. Ignores
     * dimension 0 and 1 geometries.
     *
     * @param geometry
     *            geometry
     */
    add(geometry: Geometry): void;
    /**
     * Add polygons to the centroid total
     *
     * @param polygons polygons
     */
    private addPolygons;
    /**
     * Add a polygon to the centroid total
     *
     * @param polygon
     *            polygon
     */
    private addPolygon;
    /**
     * Add a curve polygon to the centroid total
     *
     * @param curvePolygon
     *            curve polygon
     */
    private addCurvePolygon;
    /**
     * Add a line string to the centroid total
     * @param lineString line string
     */
    private addLineString;
    /**
     * Add a line string hole to subtract from the centroid total
     * @param lineString line string
     */
    private addHole;
    /**
     * Add or subtract a line string to or from the centroid total
     * @param positive true if an addition, false if a subtraction
     * @param lineString line string
     */
    private addOrSubtractLine;
    /**
     * Add or subtract a triangle of points to or from the centroid total
     * @param positive true if an addition, false if a subtraction
     * @param point1 point 1
     * @param point2 point 2
     * @param point3 point 3
     */
    private addTriangle;
    /**
     * Calculate three times the centroid of the point triangle
     * @param point1 point 1
     * @param point2 point 2
     * @param point3 point 3
     * @return 3 times centroid point
     */
    private static centroid3;
    /**
     * Calculate twice the area of the point triangle
     *
     * @param point1
     *            point 1
     * @param point2
     *            point 2
     * @param point3
     *            point 3
     * @return 2 times triangle area
     */
    private static area2;
    /**
     * Get the centroid point
     * @return centroid point
     */
    getCentroid(): Point;
}