MinMaxZoomPreference constructor

const MinMaxZoomPreference(
  1. double minZoom,
  2. double maxZoom
)

为地图创建一个不可变的最大最小缩放范围

缩放级别范围为3, 20，超出范围取边界值

Implementation

const MinMaxZoomPreference(double minZoom, double maxZoom)
    : this.minZoom = ((minZoom < 3 ? 3 : minZoom) > (maxZoom > 20 ? 20 : maxZoom) ? maxZoom : minZoom),
      this.maxZoom = ((minZoom < 3 ? 3 : minZoom) > (maxZoom > 20 ? 20 : maxZoom) ? minZoom : maxZoom);