import { XY, RGBA, b2Vec2, b2Color } from "@box2d/core";
import type { b2ParticleGroup } from "./b2_particle_group";
/**
 * The particle type. Can be combined with the | operator.
 */
export declare enum b2ParticleFlag {
    /**
     * Water particle.
     */
    b2_waterParticle = 0,
    /**
     * Removed after next simulation step.
     */
    b2_zombieParticle = 2,
    /**
     * Zero velocity.
     */
    b2_wallParticle = 4,
    /**
     * With restitution from stretching.
     */
    b2_springParticle = 8,
    /**
     * With restitution from deformation.
     */
    b2_elasticParticle = 16,
    /**
     * With viscosity.
     */
    b2_viscousParticle = 32,
    /**
     * Without isotropic pressure.
     */
    b2_powderParticle = 64,
    /**
     * With surface tension.
     */
    b2_tensileParticle = 128,
    /**
     * Mix color between contacting particles.
     */
    b2_colorMixingParticle = 256,
    /**
     * Call b2DestructionListener on destruction.
     */
    b2_destructionListenerParticle = 512,
    /**
     * Prevents other particles from leaking.
     */
    b2_barrierParticle = 1024,
    /**
     * Less compressibility.
     */
    b2_staticPressureParticle = 2048,
    /**
     * Makes pairs or triads with other particles.
     */
    b2_reactiveParticle = 4096,
    /**
     * With high repulsive force.
     */
    b2_repulsiveParticle = 8192,
    /**
     * Call b2ContactListener when this particle is about to interact with
     * a rigid body or stops interacting with a rigid body.
     * This results in an expensive operation compared to using
     * b2_fixtureContactFilterParticle to detect collisions between
     * particles.
     */
    b2_fixtureContactListenerParticle = 16384,
    /**
     * Call b2ContactListener when this particle is about to interact with
     * another particle or stops interacting with another particle.
     * This results in an expensive operation compared to using
     * b2_particleContactFilterParticle to detect collisions between
     * particles.
     */
    b2_particleContactListenerParticle = 32768,
    /**
     * Call b2ContactFilter when this particle interacts with rigid bodies.
     */
    b2_fixtureContactFilterParticle = 65536,
    /**
     * Call b2ContactFilter when this particle interacts with other
     * particles.
     */
    b2_particleContactFilterParticle = 131072
}
export interface b2IParticleDef {
    flags?: b2ParticleFlag;
    position?: XY;
    velocity?: XY;
    color?: RGBA;
    lifetime?: number;
    userData?: any;
    group?: b2ParticleGroup | null;
}
export declare class b2ParticleDef implements b2IParticleDef {
    flags: b2ParticleFlag;
    readonly position: b2Vec2;
    readonly velocity: b2Vec2;
    readonly color: b2Color;
    lifetime: number;
    userData: any;
    group: b2ParticleGroup | null;
}
export declare function b2CalculateParticleIterations(gravity: number, radius: number, timeStep: number): number;
export declare class b2ParticleHandle {
    m_index: number;
    GetIndex(): number;
    SetIndex(index: number): void;
}
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