defaultBoxEndCondition(mapBrowserEvent, startPixel, endPixel) {
    const width = endPixel[0] - startPixel[0];
    const height = endPixel[1] - startPixel[1];
    return width * width + height * height >= this.minArea_;
  }
The default condition for determining whether the boxend event
should fire.
@param {import("../MapBrowserEvent.js").default} mapBrowserEvent The originating MapBrowserEvent
    leading to the box end.
@param {import("../pixel.js").Pixel} startPixel The starting pixel of the box.
@param {import("../pixel.js").Pixel} endPixel The end pixel of the box.
@return {boolean} Whether or not the boxend condition should be fired.