import { Vec2D } from '../Math';
declare class Sprite {
    private static pathPrefix;
    private accumulator;
    private finished;
    private maxFrames;
    private onFrame;
    private onFinish;
    /**
     * Source image element
     */
    readonly img: HTMLImageElement;
    /**
     * Local image coordinates of the animation frames
     */
    readonly frames: Vec2D[];
    /**
     * Size of an individual sprite animation frame
     */
    readonly size: Vec2D;
    /**
     * Current frame index
     */
    currentFrame: number;
    /**
     * An animated sprite from an image file.
     *
     * @param file    Filepath to the target image
     * @param frameX  Width of each frame
     * @param frameY  Height of each frame
     * @param nframes Maximum number of frames
     * @param onLoad  On-load callback function
     * @param onError On-error callback function
     * @return Sprite object
     */
    private constructor();
    /**
     * Set the path prefix for where to load image files
     */
    static setPathPrefix(prefix: string): void;
    /**
     * Create a new sprite, returning a promise
     *
     * @param file          Filepath to the target image
     * @param frameX        Width of each frame
     * @param frameY        Height of each frame
     * @param nframes       Maximum number of frames
     * @param includePrefix Include the prefix in the filename
     * @return Promise to a Sprite object
     */
    static create(file: string, frameX?: number, frameY?: number, nframes?: number, includePrefix?: boolean): Promise<Sprite>;
    /**
     * Set the callback for when the animation finishes
     *
     * @param callback Callback method
     */
    setOnFinish(callback: () => void): void;
    /**
     * Set the callback for the start of an animation frame
     * The callback should take an index representing the current frame
     *
     * @param callback Callback method
     */
    setOnFrame(callback: (frame: number) => void): void;
    /**
     * Animate the sprite and update its current frame.
     * Call it on every tick.
     *
     * @param dt   Delta-time from previous tick
     * @param fps  Animation rate
     * @param loop Does the animation loop?
     */
    animate(dt: number, fps: number, loop?: boolean): void;
    /**
     * Restart the animation
     */
    restart(): void;
    /**
     * Check if the sprite's animation has finished.
     *
     * If the sprite is looping, it will always return false
     *
     * @returns Sprite animation finished?
     */
    isFinished(): boolean;
}
export { Sprite };