Add Grab System (#9)

[rbdr/sumo] / lib / systems / draw_dash.js

import { System } from '@serpentity/serpentity';

import DrawnDasherNode from '../nodes/drawn_dasher';

/**
 * Shows a different graphic during the duration of lock
 *
 * @extends {external:Serpentity.System}
 * @class DrawDashSystem
 * @param {object} config a configuration object to extend.
 */
export default class DrawDashSystem extends System {

  constructor(config = {}) {

    super();

    /**
     * The node collection of dashers
     *
     * @property {external:Serpentity.NodeCollection} drawnDashers
     * @instance
     * @memberof DrawDashSystem
     */
    this.drawnDashers = null;
  }

  /**
   * Initializes system when added. Requests drawn dasher nodes
   *
   * @function added
   * @memberof DrawDashSystem
   * @instance
   * @param {external:Serpentity.Engine} engine the serpentity engine to
   * which we are getting added
   */
  added(engine) {

    this.drawnDashers = engine.getNodes(DrawnDasherNode);
  }

  /**
   * Clears system resources when removed.
   *
   * @function removed
   * @instance
   * @memberof DrawDashSystem
   */
  removed() {

    this.drawnDashers = null;
  }

  /**
   * Runs on every update of the loop. Updates image depending on if
   * dash is locked
   *
   * @function update
   * @instance
   * @param {Number} currentFrameDuration the duration of the current
   * frame
   * @memberof DrawDashSystem
   */
  update(currentFrameDuration) {

    for (const drawnDasher of this.drawnDashers) {

      const dash = drawnDasher.dash;
      const container = drawnDasher.container.container;

      if (dash.locked) {
        this._drawDashFace(container);
        continue;
      }

      this._removeDashFace(container);
    }
  }

  // Draws the dash face

  _drawDashFace(container) {

    const blush = container.getChildByName('blush');
    const smile = container.getChildByName('smile');
    const frown = container.getChildByName('frown');
    blush.visible = true;
    frown.visible = true;
    smile.visible = false;
  }

  // Removes the dash face

  _removeDashFace(container) {

    const blush = container.getChildByName('blush');
    const smile = container.getChildByName('smile');
    const frown = container.getChildByName('frown');
    blush.visible = false;
    frown.visible = false;
    smile.visible = true;
  }
};