PBImage.ts

/**
 * @author   Ikaros Kappler
 * @date     2019-01-30
 * @modified 2019-03-23 Added JSDoc tags.
 * @modified 2020-03-25 Ported this class from vanilla-JS to Typescript.
 * @modified 2021-01-20 Added UID.
 * @modified 2022-02-02 Added the `destroy` method.
 * @modified 2022-02-02 Cleared the `PBImage.toSVGString` function (deprecated). Use `drawutilssvg` instead.
 * @version 1.2.0
 *
 * @file PBImage
 * @fileoverview As native Image objects have only a position and with
 *               and height thei are not suitable for UI dragging interfaces.
 * @public
 **/

import { Vertex } from "./Vertex";
import { UIDGenerator } from "./UIDGenerator";
import { SVGSerializable, UID } from "./interfaces";

/**
 * @classdesc A wrapper for image objects. Has an upper left and a lower right corner point.
 *
 * @requires Vertex
 * @requires SVGSerializable
 * @requires UID
 * @requires UIDGenerator
 */
export class PBImage implements SVGSerializable {
  /**
   * Required to generate proper CSS classes and other class related IDs.
   **/
  readonly className: string = "PBImage";

  /**
   * The UID of this drawable object.
   *
   * @member {UID}
   * @memberof PBImage
   * @instance
   * @readonly
   */
  readonly uid: UID;

  /**
   * @member {Vertex}
   * @memberof PBImage
   * @instance
   */
  image: HTMLImageElement;

  /**
   * @member {Vertex}
   * @memberof PBImage
   * @instance
   */
  upperLeft: Vertex;

  /**
   * @member {Vertex}
   * @memberof PBImage
   * @instance
   */
  lowerRight: Vertex;

  /**
   * @member isDestroyed
   * @memberof PBImage
   * @type {boolean}
   * @instance
   */
  isDestroyed: boolean;

  /**
   * The constructor.
   *
   * @constructor
   * @name PBImage
   * @param {Image} image - The actual image.
   * @param {Vertex} upperLeft - The upper left corner.
   * @param {Vertex} lowerRight - The lower right corner.
   **/
  constructor(image: HTMLImageElement, upperLeft: Vertex, lowerRight: Vertex) {
    this.uid = UIDGenerator.next();
    this.image = image;
    this.upperLeft = upperLeft;
    this.lowerRight = lowerRight;
  }

  /**
   * This function should invalidate any installed listeners and invalidate this object.
   * After calling this function the object might not hold valid data any more and
   * should not be used.
   */
  destroy() {
    this.upperLeft.destroy();
    this.lowerRight.destroy();
    this.isDestroyed = true;
  }
}