import { Particle } from './Types';
/** A particle system which contains particles that update themselves */
export default class ParticleSystem {
    readonly PARTICLE_POOL_SIZE = 2000;
    readonly PARTICLE_LIFETIME = 40;
    private width;
    private height;
    private oldestParticle;
    private lastUpdate;
    readonly particles: readonly Readonly<Particle>[];
    /**
     * @param width - Height of the particle system, typically in pixels
     * @param height - Width of the particle system, typically in pixels
     */
    constructor(width: number, height: number);
    /**
     * Update the size of the particle system.
     * @param newWidth - New width in pixels
     * @param newHeight - New height in pixels
     */
    setSize(newWidth: number, newHeight: number): void;
    /**
     * Updates all particle positions based on their current position,
     * velocity, and the amount of time that's passed.
     */
    update(): void;
    /**
     * Creates a new particle
     * @param x - Particle's x position, in pixels
     * @param y - Particle's y position, in pixels
     * @param vx - Particle's x velocity, in pixels per 1/60th of a second
     * @param vy - Particle's y velocity, in pixels per 1/60th of a second
     */
    createParticle(x: number, y: number, vx: number, vy: number): void;
    /**
     * Creates a burst of particles exploding out in a circle from a single point
     * @param x - The x coordinate of the emanation point
     * @param y - The y coordinate of the emanation point
     * @param v - The velocity of the particles, in pixels per 1/60th of a second
     * @param n - The number of particles to create
     */
    createParticleBurst(x: number, y: number, v: number, n: number): void;
}