import { Module, ModuleObject } from "../module";
import { ParticleEffect } from "../particleEffect";
import { Position } from "../types";
/**
 * @module
 * @category    Modifier
 * strength {
 *      @tooltip        TODO
 *      @type           Number
 *      @step           10
 *      @defaultValue   100
 * }
 * center {
 *      @tooltip        TODO
 *      @type           Position
 *      @defaultValue   { "x": 0, "y": 0 }
 * }
 * minPullStrengthMultiplier {
 *      @tooltip        TODO
 *      @type           Number
 *      @step           0.1
 *      @defaultValue   0.2
 * }
 * maxPullStrengthMultiplier {
 *      @tooltip        TODO
 *      @type           Number
 *      @step           0.1
 *      @defaultValue   1.0
 * }
 * minPullStrengthDistance {
 *      @tooltip        TODO
 *      @type           Number
 *      @step           50
 *      @defaultValue   500
 * }
 * maxPullStrengthDistance {
 *      @tooltip        TODO
 *      @type           Number
 *      @step           50
 *      @defaultValue   100
 * }
 */
export declare class GravityWithCenter extends Module {
    strength: number;
    /**
     * Center of gravity. Pulls particles towards that location with varying strength
     * based on how close the particle is to the location (closer = stronger pull).
     * The pull strength can be further configured with properties: `maxPullStrengthDistance`, `maxPullStrengthMultiplier`, `minPullStrengthDistance` and `minPullStrengthMultiplier`
     */
    center: Position;
    /**
     * Particle distance from `center` that will correspond to gravity strength multiplier `maxPullStrengthMultiplier`
     */
    maxPullStrengthDistance: number;
    /**
     * `strength` multiplier that is used when particle is `maxPullStrengthDistance` away from `center`.
     */
    maxPullStrengthMultiplier: number;
    /**
     * Particle distance from `center` that will correspond to gravity strength multiplier `minPullStrengthMultiplier`
     */
    minPullStrengthDistance: number;
    /**
     * `strength` multiplier that is used when particle is `minPullStrengthDistance` away from `center`.
     */
    minPullStrengthMultiplier: number;
    update(dt: number): void;
    /**
     * Wrap the properties of the module into a JSON containing only primitive JavaScript data types
     * (such as numbers, strings, etc.) that can be serialized into strings natively.
     */
    toObject(): ModuleObject;
    static fromObject(particleEffect: ParticleEffect, object: ModuleObject, hideWarnings: boolean): GravityWithCenter;
    /**
     * Serializable identifier for the module.
     *
     * This must be unique between all existing Modules in the library.
     */
    static moduleTypeId: string;
}