import { Point } from '../vector';
import SkeletonContext from './SkeletonContext';
import SkeletonNode from './SkeletonNode';
export default class StraightSkeleton {
    private offsetDistance;
    private distanceSign;
    private initialNodes;
    private _ctx;
    constructor();
    getCtx(): SkeletonContext;
    /**
     * Sets the absolute distance in units by which the edges should be moved.<br>
     * Positive: Grow face. Negative: Shrink face.<br>
     * Defaults to Float.NEGATIVE_INFINITY.
     * @param distance
     */
    setDistance(distance: number): void;
    /**
     * Sets the epsilon value that is used for degeneracy tests. Bigger values may reduce errors due to numerical instability in certain cases.
     * Defaults to 0.0001f.
     * @param epsilon
     */
    setEpsilon(epsilon: number): void;
    execute(contour: Point[], holes?: Point[][], debugStep?: boolean): (() => any | null) | undefined;
    loop(): void;
    loopStep(): () => any | null;
    _eachLoop(): boolean;
    /**
     * Creates MovingNodes for all the vertices.
     * Also calculates bounding rectangle.
     * @return Diagonal length of bounding rectangle.
     */
    private _createNodes;
    private _createNode;
    initBisectors(): void;
    initEvents(): void;
    scale(dist: number): void;
    private isInvalid;
    getStartNodes(): SkeletonNode[];
    getEndNodes(): SkeletonNode[];
    getNodeLoops(): SkeletonNode[][];
}