Class OnFloor

Extensions/PlatformBehavior/platformerobjectruntimebehavior.ts:1923–2234

* The object is on the floor standing or walking. * * Also see ./README.md

   * Also see {@link ./README.md}
   */
  class OnFloor implements State {
    private _behavior: PlatformerObjectRuntimeBehavior;
    private _floorPlatform: gdjs.PlatformRuntimeBehavior | null = null;
    private _floorPolygon: gdjs.Polygon | null = null;
    private _floorLastX: float = 0;
    private _floorLastY: float = 0;
    _oldHeight: float = 0;

    constructor(behavior: PlatformerObjectRuntimeBehavior) {
      this._behavior = behavior;
    }

    getFloorPlatform() {
      return this._floorPlatform;
    }

    getFloorPolygon() {
      return this._floorPolygon;
    }

    enter(
      floorPlatform: gdjs.PlatformRuntimeBehavior,
      floorPolygon: gdjs.Polygon
    ) {
      this._floorPlatform = floorPlatform;
      this._floorPolygon = floorPolygon;
      this.updateFloorPosition();
      this._behavior._canJump = true;
      this._behavior._currentFallSpeed = 0;
    }

    leave() {
      this._floorPlatform = null;
      this._floorPolygon = null;
    }

    updateFloorPosition() {
      this._floorLastX = this._floorPlatform!.owner.getX();
      this._floorLastY = this._floorPlatform!.owner.getY();
    }

    beforeUpdatingObstacles(timeDelta: float) {
      const object = this._behavior.owner;
      // Stick the object to the floor if its height has changed.
      if (this._oldHeight !== object.getHeight()) {
        // TODO This should probably be done after the events because
        // the character stays at the wrong place during 1 frame.
        const deltaY =
          ((this._oldHeight - object.getHeight()) *
            (object.getHeight() + object.getDrawableY() - object.getY())) /
          object.getHeight();
        object.setY(object.getY() + deltaY);
      }
      // Directly follow the floor movement on the Y axis by moving the character.
      // For the X axis, we follow the floor movement using `_requestedDeltaX`
      // (see `beforeMovingX`).
      // We don't use `_requestedDeltaY` to follow the floor on the Y axis
      // to avoid a transition loop with the Falling state.