import type { Vector3 } from '@holoscript/core';
/**
 * ParticleEmitter.ts
 *
 * Particle emission system: shapes, lifetime, velocity,
 * color/size over lifetime curves, and sub-emitters.
 *
 * @module particles
 */
export type IVector3 = Vector3;
export interface IColor {
    r: number;
    g: number;
    b: number;
    a: number;
}
export interface CurveKeyframe {
    time: number;
    value: number;
}
export type EmissionShape = 'point' | 'sphere' | 'box' | 'cone' | 'circle' | 'line';
export interface EmitterConfig {
    id: string;
    maxParticles: number;
    emissionRate: number;
    emissionShape: EmissionShape;
    shapeParams: {
        radius?: number;
        angle?: number;
        extents?: IVector3;
        length?: number;
    };
    lifetime: {
        min: number;
        max: number;
    };
    startSpeed: {
        min: number;
        max: number;
    };
    startSize: {
        min: number;
        max: number;
    };
    startColor: IColor;
    endColor?: IColor;
    gravity: number;
    sizeOverLifetime?: CurveKeyframe[];
    alphaOverLifetime?: CurveKeyframe[];
    speedOverLifetime?: CurveKeyframe[];
    worldSpace: boolean;
    prewarm: boolean;
}
export interface Particle {
    position: IVector3;
    velocity: IVector3;
    color: IColor;
    size: number;
    age: number;
    lifetime: number;
    alive: boolean;
    startSpeed: number;
}
export interface EmitterState {
    id: string;
    playing: boolean;
    elapsed: number;
    emissionAccum: number;
    aliveCount: number;
    totalEmitted: number;
}
export declare class ParticleEmitter {
    readonly config: EmitterConfig;
    private particles;
    private state;
    constructor(config: EmitterConfig);
    play(): void;
    pause(): void;
    stop(): void;
    isPlaying(): boolean;
    getState(): EmitterState;
    update(dt: number): Particle[];
    private emit;
    private sampleShape;
    private randomDirection;
    private createDeadParticle;
    getAliveParticles(): Particle[];
    getAliveCount(): number;
    getCapacity(): number;
}
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