import { vec2 } from "gl-matrix";
import CollisionObject from "../collisionObject";
import Constraint, { ConstraintOptions } from "./constraint";
interface SpringConstraintOptions extends ConstraintOptions {
    length: number;
    stiffness: number;
    damping: number;
}
/**
 * Represents a damped spring joint between two {@link CollisionObject}s or
 * a {@link CollisionObject} and a point.
 */
export default class SpringConstraint extends Constraint {
    length: number;
    stiffness: number;
    angularStiffness: number;
    damping: number;
    nDelta: vec2;
    nMass: number;
    targetVrn: number;
    vCoef: number;
    jAcc: number;
    /**
     * Creates a new {@link SpringConstraint} between two bodies.
     *
     * @param a The first body
     * @param b The second body
     * @param length The resting length of the spring
     * @param stiffness The stiffness of the spring
     * @param damping The damping of the spring
     */
    constructor(a: CollisionObject, b: CollisionObject, length: number, stiffness: number, damping?: number);
    /**
     * Creates a new {@link SpringConstraint} with the given options.
     *
     * @param opts The constraint options
     */
    constructor(opts: SpringConstraintOptions);
    /**
     * Creates a new {@link SpringConstraint} between a body and a point.
     *
     * @param a The body to constrain
     * @param point A point in world space
     * @param length The resting length of the spring.
     * @param stiffness The stiffness of the spring
     * @param damping The damping of the spring
     */
    constructor(a: CollisionObject, point: vec2, length: number, stiffness: number, damping?: number);
    /**
     * Updates the constraints anchors and prepares for solving.
     *
     * @param dt The time since the last update
     */
    preSolve(dt: number): void;
    /**
     * Applies the spring forces to the attached bodies.
     *
     * @see [Chipmunk2D Damped Spring](https://github.com/slembcke/Chipmunk2D/blob/master/src/cpDampedSpring.c)
     * @see [Constraints and Solvers](https://research.ncl.ac.uk/game/mastersdegree/gametechnologies/physicstutorials/8constraintsandsolvers/Physics%20-%20Constraints%20and%20Solvers.pdf)
     *
     * @param dt The time since the last update
     */
    solve(dt: number): void;
    postSolve(): void;
    private calcForce;
}
export {};