Qt 5.11 | Qt Location | Map Viewer (QML) | MiniMap.qml Example File

Qt 5.11.3 Reference Documentation

# 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)
                  }
              }
          }
      }