import type { Color } from "../../math/color.ts";
import type Tween from "../../tweens/tween.ts";
import type Renderer from "../../video/renderer.js";
import type Camera2d from "../camera2d.ts";
import CameraEffect from "./camera_effect.ts";
/**
 * A camera effect that fades the screen to or from a color overlay.
 * @category Camera
 * @example
 * // fade to black
 * camera.addCameraEffect(new FadeEffect(camera, {
 *     color: "#000",
 *     duration: 500,
 *     direction: "in",
 * }));
 * @example
 * // flash white then fade back
 * camera.addCameraEffect(new FadeEffect(camera, {
 *     color: "#fff",
 *     duration: 200,
 *     direction: "out",
 * }));
 */
export default class FadeEffect extends CameraEffect {
    /**
     * the overlay color
     */
    color: Color;
    /**
     * the tween controlling alpha transition
     */
    tween: Tween;
    /**
     * fade direction: "in" fades to the color, "out" fades from the color back to transparent
     */
    direction: "in" | "out";
    /**
     * target alpha value for completion check
     * @ignore
     */
    _targetAlpha: number;
    /**
     * @param camera - the camera to apply the fade to
     * @param options - fade parameters
     * @param options.color - CSS color value or Color instance
     * @param [options.duration=1000] - fade duration in milliseconds
     * @param [options.direction="in"] - "in" fades to color, "out" fades from color to transparent
     * @param [options.onComplete] - callback when the fade finishes
     */
    constructor(camera: Camera2d, options: {
        color: Color | string;
        duration?: number | undefined;
        direction?: "in" | "out" | undefined;
        onComplete?: (() => void) | undefined;
    });
    draw(renderer: Renderer, width: number, height: number): void;
    update(): void;
    destroy(): void;
}
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