MiniMap.qml Example File

mapviewer/map/MiniMap.qml
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 import QtQuick 2.5
 import QtPositioning 5.3
 import QtLocation 5.6

 Rectangle{

     function clamp(num, min, max)
     {
       return num < min ? min : num > max ? max : num;
     }

     function minimumScaleFactor()
     {
         var hscalefactor = (400.0 / Math.max(Math.min(map.width, 1000), 400)) * 0.5
         var vscalefactor = (400.0 / Math.max(Math.min(map.height, 1000), 400)) * 0.5
         return Math.min(hscalefactor,vscalefactor)
     }

     function avgScaleFactor()
     {
         var hscalefactor = (400.0 / Math.max(Math.min(map.width, 1000), 400)) * 0.5
         var vscalefactor = (400.0 / Math.max(Math.min(map.height, 1000), 400)) * 0.5
         return (hscalefactor+vscalefactor) * 0.5
     }

     id: miniMapRect
     width: Math.floor(map.width * avgScaleFactor()) + 2
     height: Math.floor(map.height * avgScaleFactor()) + 2
     anchors.right: (parent) ? parent.right : undefined
     anchors.rightMargin: 10
     anchors.top: (parent) ? parent.top : undefined
     anchors.topMargin: 10
     color: "#242424"
     Map {
         id: miniMap
         anchors.top: parent.top
         anchors.topMargin: 1
         anchors.left: parent.left
         anchors.leftMargin: 1
         width: Math.floor(map.width * avgScaleFactor())
         height: Math.floor(map.height * avgScaleFactor())
         zoomLevel: clamp(map.zoomLevel - 4.5, 2.0, 5.0) //(map.zoomLevel > minimumZoomLevel + 3) ? minimumZoomLevel + 3 : 1.5
         center: map.center
         plugin: map.plugin
         gesture.enabled: false
         copyrightsVisible: false
         property double mapZoomLevel : map.zoomLevel

         // cannot use property bindings on map.visibleRegion in MapRectangle because it's non-NOTIFYable
         onCenterChanged: miniMapRectangle.updateCoordinates()
         onMapZoomLevelChanged: miniMapRectangle.updateCoordinates()
         onWidthChanged: miniMapRectangle.updateCoordinates()
         onHeightChanged: miniMapRectangle.updateCoordinates()

         MapRectangle {
             id: miniMapRectangle
             color: "#44ff0000"
             border.width: 1
             border.color: "red"

             function getMapVisibleRegion()
             {
                 return QtPositioning.shapeToRectangle(map.visibleRegion)
             }

             function updateCoordinates()
             {
                 topLeft.latitude =  getMapVisibleRegion().topLeft.latitude
                 topLeft.longitude=  getMapVisibleRegion().topLeft.longitude
                 bottomRight.latitude =  getMapVisibleRegion().bottomRight.latitude
                 bottomRight.longitude=  getMapVisibleRegion().bottomRight.longitude
                 console.log("TopLeft: " + topLeft)
                 console.log("BotRigh: " + bottomRight)
             }
         }
     }
 }