import CollisionObject from "../collisionObject";
import Constraint, { ConstraintOptions } from "./constraint";
interface RotarySpringConstraintOptions extends ConstraintOptions {
    angle: number;
    stiffness: number;
    damping: number;
}
/**
 * Represents a damped rotary spring joint between two {@link CollisionObject}s or
 * a {@link CollisionObject} and itself.
 *
 * This joint will aim to maintain the provided angle between the 2 bodies.
 *
 * When the joint only consists of one body it will aim to keep that bodies rotation at the specified angle.
 *
 * Setting anchor points for this constraint will have no affect.
 */
export default class RotarySpringConstraint extends Constraint {
    angle: number;
    stiffness: number;
    damping: number;
    inertiaSum: number;
    targetWrn: number;
    wCoef: number;
    jAcc: number;
    /**
     * Creates a new {@link RotarySpringConstraint} between two bodies.
     *
     * @param a The first body
     * @param b The second body
     * @param angle The resting angle of the spring
     * @param stiffness The stiffness of the spring
     * @param damping The damping of the spring
     */
    constructor(a: CollisionObject, b: CollisionObject, angle: number, stiffness: number, damping?: number);
    /**
     * Creates a new {@link SpringConstraint} with the given options.
     *
     * @param opts The constraint options
     */
    constructor(opts: RotarySpringConstraintOptions);
    /**
     * Creates a new {@link RotarySpringConstraint} between a body and a point.
     *
     * @param a The body to constrain
     * @param angle The resting angle of the spring.
     * @param stiffness The stiffness of the spring
     * @param damping The damping of the spring
     */
    constructor(a: CollisionObject, angle: number, stiffness: number, damping?: number);
    /**
     * Prepares the spring 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;
    /**
     * Calculates the torque required to correct the spring.
     *
     * @returns The torque required to correct the spring
     */
    private calcTorque;
}
export {};