Show the crop box manually
function crop() {
    if (this.ready && !this.cropped && !this.disabled) {
      this.cropped = true;
      this.limitCropBox(true, true);

      if (this.options.modal) {
        addClass(this.dragBox, CLASS_MODAL);
      }

      removeClass(this.cropBox, CLASS_HIDDEN);
      this.setCropBoxData(this.initialCropBoxData);
    }

    return this;
  }