Method onResize

src/scale-manager/SafeScaleManager.js:78–123

* onResize maps and passes the relevant data to the user provided callback function. * @param {object} param * @param {number} param.width - Current window width * @param {number} param.height - Current window height * @private

({ width, height })

   * @private
   */
  onResize({ width, height }) {
    // Calculate the scaling ratio.
    this.scaleRatio = Math.min(width / this.safeWidth, height / this.safeHeight);

    const nWidth = Math.max(0, Math.min(this.gameWidth * this.scaleRatio, width));
    const nHeight = Math.max(0, Math.min(this.gameHeight * this.scaleRatio, height));

    const scale = {
      x: (this.gameWidth / nWidth) * this.scaleRatio,
      y: (this.gameHeight / nHeight) * this.scaleRatio
    };

    const scaledWidth = width / this.scaleRatio;
    const scaledHeight = height / this.scaleRatio;

    this.viewArea.left = Math.max(-(scaledWidth - this.gameWidth) * 0.5, 0);
    this.viewArea.top = Math.max(-(scaledHeight - this.gameHeight) * 0.5, 0);
    this.viewArea.right = Math.min(this.viewArea.left + scaledWidth, this.gameWidth);
    this.viewArea.bottom = Math.min(this.viewArea.top + scaledHeight, this.gameHeight);
    
    this.viewArea.x = this.viewArea.left;
    this.viewArea.y = this.viewArea.top;
    this.viewArea.width = this.viewArea.right - this.viewArea.left;
    this.viewArea.height = this.viewArea.bottom - this.viewArea.top;

    /** @type {EntityResizeEvent} */
    this.resizeEventData = Object.freeze({
      offset: { x: this.viewArea.x, y: this.viewArea.y },
      gameSize:{ x: this.gameWidth, y: this.gameHeight },
      viewArea: this.viewArea,
      scale
    });
    
    this.callback({ 
      width: nWidth, 
      height: nHeight, 
      scaleRatio: this.scaleRatio,
      viewArea: this.viewArea,
      scale
    });

    for (let i = 0, length = this.entities.length; i < length; i++) {
      const entity = this.entities[i];
      entity.onResize(this.resizeEventData);
    }
  }

  /**
   * Calculates the offset for anchors.