# CameraPosition constructor

const CameraPosition(

1. {double bearing: 0.0,
2. @required LatLng target,
3. double tilt: 0.0,
4. double zoom: 10}

)

构造一个CameraPosition 对象

如果`bearing`, `target`, `tilt`, 或者 `zoom` 为null时会返回AssertionError

## Implementation

    const CameraPosition({
      this.bearing = 0.0,
      @required this.target,
      this.tilt = 0.0,
      this.zoom = 10,
    })  : assert(bearing != null),
          assert(target != null),
          assert(tilt != null),
          assert(zoom != null);