import LineSegment2 from './LineSegment2';
import { Point2 } from '../Vec2';
import Rect2 from './Rect2';
/**
 * An abstract base class for 2D shapes.
 */
export declare abstract class Abstract2DShape {
    protected static readonly smallValue = 1e-12;
    /**
     * @returns the distance from `point` to this shape. If `point` is within this shape,
     * this returns the distance from `point` to the edge of this shape.
     *
     * @see {@link signedDistance}
     */
    distance(point: Point2): number;
    /**
     * Computes the [signed distance function](https://en.wikipedia.org/wiki/Signed_distance_function)
     * for this shape.
     */
    abstract signedDistance(point: Point2): number;
    /**
     * @returns points at which this shape intersects the given `lineSegment`.
     *
     * If this is a closed shape, returns points where the given `lineSegment` intersects
     * the **boundary** of this.
     */
    abstract intersectsLineSegment(lineSegment: LineSegment2): Point2[];
    /**
     * Returns `true` if and only if the given `point` is contained within this shape.
     *
     * `epsilon` is a small number used to counteract floating point error. Thus, if
     * `point` is within `epsilon` of the inside of this shape, `containsPoint` may also
     * return `true`.
     *
     * The default implementation relies on `signedDistance`.
     * Subclasses may override this method to provide a more efficient implementation.
     */
    containsPoint(point: Point2, epsilon?: number): boolean;
    /**
     * Returns a bounding box that precisely fits the content of this shape.
     *
     * **Note**: This bounding box should aligned with the x/y axes. (Thus, it may be
     * possible to find a tighter bounding box not axes-aligned).
     */
    abstract getTightBoundingBox(): Rect2;
    /**
     * Returns a bounding box that **loosely** fits the content of this shape.
     *
     * The result of this call can be larger than the result of {@link getTightBoundingBox},
     * **but should not be smaller**. Thus, a call to `getLooseBoundingBox` can be significantly
     * faster than a call to {@link getTightBoundingBox} for some shapes.
     */
    getLooseBoundingBox(): Rect2;
}
export default Abstract2DShape;