ZoomOption constructor

const ZoomOption({ double stepZoom = 1, double initZoom = 2, double minZoomLevel = 2, double maxZoomLevel = 19, })

Implementation

const ZoomOption({
  this.stepZoom = 1,
  this.initZoom = 2,
  this.minZoomLevel = 2,
  this.maxZoomLevel = 19,
}) : assert(maxZoomLevel <= 19),
     assert(minZoomLevel >= 2),
     assert(initZoom >= minZoomLevel || initZoom <= maxZoomLevel);