import { vec2 } from "gl-matrix";
import Object2D from "../object2d";
import Viewport from "./viewport";
/**
 * Represents the camera in 2D world space.
 *
 * The camera's position is the centre of the viewport.
 */
export default class Camera extends Object2D {
    viewport: Viewport;
    private zoomLevel;
    minZoom: number;
    maxZoom: number;
    lastPos: vec2;
    /**
     * Creates a {@link Camera} instance and instantiates its {@link Viewport} with a width and height at the camera's centre.
     *
     * @param centre The centre of the camera's viewport
     * @param vw The camera's viewport width
     * @param vh The camera's viewport height
     */
    constructor(centre: vec2, vw: number, vh: number);
    /**
     * Creates a {@link Camera} instance and sets its viewport.
     *
     * @param centre The centre of the camera's viewport
     * @param viewport The viewport to use with the camera
     */
    constructor(centre: vec2, viewport: Viewport);
    /**
     * Updates the camera's viewport if the camera has changed position since the last call to update.
     */
    update(): void;
    /**
     * Zooms the camera by the given amount.
     *
     * @param zoom The amount to zoom by
     */
    zoom(zoom: number): void;
    /**
     * Sets the zoom level of the camera.
     *
     * This will change the size of `this.viewport`.
     *
     * @param zoom The zoom level
     */
    setZoom(zoom: number): void;
    /**
     * Gets the zoom level of the camera.
     *
     * @returns The zoom level of the camera
     */
    getZoom(): number;
}