Qt 5.9 | Qt Location | Map Viewer (QML) | MapComponent.qml Example File

Qt 5.9.4 Reference Documentation

# MapComponent.qml Example File

mapviewer/map/MapComponent.qml

      /****************************************************************************
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      import QtQuick 2.5
      import QtQuick.Controls 1.4
      import QtLocation 5.9
      import QtPositioning 5.5
      import "../helper.js" as Helper

      Map {
          id: map
          property variant markers
          property variant mapItems
          property int markerCounter: 0 // counter for total amount of markers. Resets to 0 when number of markers = 0
          property int currentMarker
          property int lastX : -1
          property int lastY : -1
          property int pressX : -1
          property int pressY : -1
          property int jitterThreshold : 30
          property bool followme: false
          property variant scaleLengths: [5, 10, 20, 50, 100, 200, 500, 1000, 2000, 5000, 10000, 20000, 50000, 100000, 200000, 500000, 1000000, 2000000]
          property alias routeQuery: routeQuery
          property alias routeModel: routeModel
          property alias geocodeModel: geocodeModel
          property alias slidersExpanded: sliders.expanded

          signal showGeocodeInfo()
          signal geocodeFinished()
          signal routeError()
          signal coordinatesCaptured(double latitude, double longitude)
          signal showMainMenu(variant coordinate)
          signal showMarkerMenu(variant coordinate)
          signal showRouteMenu(variant coordinate)
          signal showPointMenu(variant coordinate)
          signal showRouteList()

          function geocodeMessage()
          {
              var street, district, city, county, state, countryCode, country, postalCode, latitude, longitude, text
              latitude = Math.round(geocodeModel.get(0).coordinate.latitude * 10000) / 10000
              longitude =Math.round(geocodeModel.get(0).coordinate.longitude * 10000) / 10000
              street = geocodeModel.get(0).address.street
              district = geocodeModel.get(0).address.district
              city = geocodeModel.get(0).address.city
              county = geocodeModel.get(0).address.county
              state = geocodeModel.get(0).address.state
              countryCode = geocodeModel.get(0).address.countryCode
              country = geocodeModel.get(0).address.country
              postalCode = geocodeModel.get(0).address.postalCode

              text = "<b>Latitude:</b> " + latitude + "<br/>"
              text +="<b>Longitude:</b> " + longitude + "<br/>" + "<br/>"
              if (street) text +="<b>Street: </b>"+ street + " <br/>"
              if (district) text +="<b>District: </b>"+ district +" <br/>"
              if (city) text +="<b>City: </b>"+ city + " <br/>"
              if (county) text +="<b>County: </b>"+ county + " <br/>"
              if (state) text +="<b>State: </b>"+ state + " <br/>"
              if (countryCode) text +="<b>Country code: </b>"+ countryCode + " <br/>"
              if (country) text +="<b>Country: </b>"+ country + " <br/>"
              if (postalCode) text +="<b>PostalCode: </b>"+ postalCode + " <br/>"
              return text
          }

          function calculateScale()
          {
              var coord1, coord2, dist, text, f
              f = 0
              coord1 = map.toCoordinate(Qt.point(0,scale.y))
              coord2 = map.toCoordinate(Qt.point(0+scaleImage.sourceSize.width,scale.y))
              dist = Math.round(coord1.distanceTo(coord2))

              if (dist === 0) {
                  // not visible
              } else {
                  for (var i = 0; i < scaleLengths.length-1; i++) {
                      if (dist < (scaleLengths[i] + scaleLengths[i+1]) / 2 ) {
                          f = scaleLengths[i] / dist
                          dist = scaleLengths[i]
                          break;
                      }
                  }
                  if (f === 0) {
                      f = dist / scaleLengths[i]
                      dist = scaleLengths[i]
                  }
              }

              text = Helper.formatDistance(dist)
              scaleImage.width = (scaleImage.sourceSize.width * f) - 2 * scaleImageLeft.sourceSize.width
              scaleText.text = text
          }

          function deleteMarkers()
          {
              var count = map.markers.length
              for (var i = 0; i<count; i++){
                  map.removeMapItem(map.markers[i])
                  map.markers[i].destroy()
              }
              map.markers = []
              markerCounter = 0
          }

          function deleteMapItems()
          {
              var count = map.mapItems.length
              for (var i = 0; i<count; i++){
                  map.removeMapItem(map.mapItems[i])
                  map.mapItems[i].destroy()
              }
              map.mapItems = []
          }

          function addMarker()
          {
              var count = map.markers.length
              markerCounter++
              var marker = Qt.createQmlObject ('Marker {}', map)
              map.addMapItem(marker)
              marker.z = map.z+1
              marker.coordinate = mouseArea.lastCoordinate

              //update list of markers
              var myArray = new Array()
              for (var i = 0; i<count; i++){
                  myArray.push(markers[i])
              }
              myArray.push(marker)
              markers = myArray
          }

          function addGeoItem(item)
          {
              var count = map.mapItems.length
              var co = Qt.createComponent(item+'.qml')
              if (co.status == Component.Ready) {
                  var o = co.createObject(map)
                  o.setGeometry(map.markers, currentMarker)
                  map.addMapItem(o)
                  //update list of items
                  var myArray = new Array()
                  for (var i = 0; i<count; i++){
                      myArray.push(mapItems[i])
                  }
                  myArray.push(o)
                  mapItems = myArray

              } else {
                  console.log(item + " is not supported right now, please call us later.")
              }
          }

          function deleteMarker(index)
          {
              //update list of markers
              var myArray = new Array()
              var count = map.markers.length
              for (var i = 0; i<count; i++){
                  if (index != i) myArray.push(map.markers[i])
              }

              map.removeMapItem(map.markers[index])
              map.markers[index].destroy()
              map.markers = myArray
              if (markers.length == 0) markerCounter = 0
          }

          function calculateMarkerRoute()
          {
              routeQuery.clearWaypoints();
              for (var i = currentMarker; i< map.markers.length; i++){
                  routeQuery.addWaypoint(markers[i].coordinate)
              }
              routeQuery.travelModes = RouteQuery.CarTravel
              routeQuery.routeOptimizations = RouteQuery.ShortestRoute
              routeQuery.setFeatureWeight(0, 0)
              routeModel.update();
          }

          function calculateCoordinateRoute(startCoordinate, endCoordinate)
          {
              // clear away any old data in the query
              routeQuery.clearWaypoints();

              // add the start and end coords as waypoints on the route
              routeQuery.addWaypoint(startCoordinate)
              routeQuery.addWaypoint(endCoordinate)
              routeQuery.travelModes = RouteQuery.CarTravel
              routeQuery.routeOptimizations = RouteQuery.FastestRoute

              for (var i=0; i<9; i++) {
                  routeQuery.setFeatureWeight(i, 0)
              }
              //for (var i=0; i<routeDialog.features.length; i++) {
              //    map.routeQuery.setFeatureWeight(routeDialog.features[i], RouteQuery.AvoidFeatureWeight)
              //}

              routeModel.update();

              // center the map on the start coord
              map.center = startCoordinate;
          }

          function geocode(fromAddress)
          {
              // send the geocode request
              geocodeModel.query = fromAddress
              geocodeModel.update()
          }

          zoomLevel: (maximumZoomLevel - minimumZoomLevel)/2
          center {
              // The Qt Company in Oslo
              latitude: 59.9485
              longitude: 10.7686
          }

          // Enable pan, flick, and pinch gestures to zoom in and out
          gesture.acceptedGestures: MapGestureArea.PanGesture | MapGestureArea.FlickGesture | MapGestureArea.PinchGesture | MapGestureArea.RotationGesture | MapGestureArea.TiltGesture
          gesture.flickDeceleration: 3000
          gesture.enabled: true
          focus: true
          onCopyrightLinkActivated: Qt.openUrlExternally(link)

          onCenterChanged:{
              scaleTimer.restart()
              if (map.followme)
                  if (map.center != positionSource.position.coordinate) map.followme = false
          }

          onZoomLevelChanged:{
              scaleTimer.restart()
              if (map.followme) map.center = positionSource.position.coordinate
          }

          onWidthChanged:{
              scaleTimer.restart()
          }

          onHeightChanged:{
              scaleTimer.restart()
          }

          Component.onCompleted: {
              markers = new Array();
              mapItems = new Array();
          }

          Keys.onPressed: {
              if (event.key === Qt.Key_Plus) {
                  map.zoomLevel++;
              } else if (event.key === Qt.Key_Minus) {
                  map.zoomLevel--;
              } else if (event.key === Qt.Key_Left || event.key === Qt.Key_Right ||
                         event.key === Qt.Key_Up   || event.key === Qt.Key_Down) {
                  var dx = 0;
                  var dy = 0;

                  switch (event.key) {

                  case Qt.Key_Left: dx = map.width / 4; break;
                  case Qt.Key_Right: dx = -map.width / 4; break;
                  case Qt.Key_Up: dy = map.height / 4; break;
                  case Qt.Key_Down: dy = -map.height / 4; break;

                  }

                  var mapCenterPoint = Qt.point(map.width / 2.0 - dx, map.height / 2.0 - dy);
                  map.center = map.toCoordinate(mapCenterPoint);
              }
          }

          /* @todo
          Binding {
              target: map
              property: 'center'
              value: positionSource.position.coordinate
              when: followme
          }*/

          PositionSource{
              id: positionSource
              active: followme

              onPositionChanged: {
                  map.center = positionSource.position.coordinate
              }
          }

          MapQuickItem {
              id: poiTheQtComapny
              sourceItem: Rectangle { width: 14; height: 14; color: "#e41e25"; border.width: 2; border.color: "white"; smooth: true; radius: 7 }
              coordinate {
                  latitude: 59.9485
                  longitude: 10.7686
              }
              opacity: 1.0
              anchorPoint: Qt.point(sourceItem.width/2, sourceItem.height/2)
          }

          MapQuickItem {
              sourceItem: Text{
                  text: "The Qt Company"
                  color:"#242424"
                  font.bold: true
                  styleColor: "#ECECEC"
                  style: Text.Outline
              }
              coordinate: poiTheQtComapny.coordinate
              anchorPoint: Qt.point(-poiTheQtComapny.sourceItem.width * 0.5,poiTheQtComapny.sourceItem.height * 1.5)
          }

          MapSliders {
              id: sliders
              z: map.z + 3
              mapSource: map
              edge: Qt.LeftEdge
          }

          Item {
              id: scale
              z: map.z + 3
              visible: scaleText.text != "0 m"
              anchors.bottom: parent.bottom;
              anchors.right: parent.right
              anchors.margins: 20
              height: scaleText.height * 2
              width: scaleImage.width

              Image {
                  id: scaleImageLeft
                  source: "../resources/scale_end.png"
                  anchors.bottom: parent.bottom
                  anchors.right: scaleImage.left
              }
              Image {
                  id: scaleImage
                  source: "../resources/scale.png"
                  anchors.bottom: parent.bottom
                  anchors.right: scaleImageRight.left
              }
              Image {
                  id: scaleImageRight
                  source: "../resources/scale_end.png"
                  anchors.bottom: parent.bottom
                  anchors.right: parent.right
              }
              Label {
                  id: scaleText
                  color: "#004EAE"
                  anchors.centerIn: parent
                  text: "0 m"
              }
              Component.onCompleted: {
                  map.calculateScale();
              }
          }

          RouteModel {
              id: routeModel
              plugin : map.plugin
              query:  RouteQuery {
                  id: routeQuery
              }
              onStatusChanged: {
                  if (status == RouteModel.Ready) {
                      switch (count) {
                      case 0:
                          // technically not an error
                          map.routeError()
                          break
                      case 1:
                          map.showRouteList()
                          break
                      }
                  } else if (status == RouteModel.Error) {
                      map.routeError()
                  }
              }
          }

          Component {
              id: routeDelegate

              MapRoute {
                  id: route
                  route: routeData
                  line.color: "#46a2da"
                  line.width: 5
                  smooth: true
                  opacity: 0.8
                  MouseArea {
                      id: routeMouseArea
                      anchors.fill: parent
                      hoverEnabled: false
                      property variant lastCoordinate

                      onPressed : {
                          map.lastX = mouse.x + parent.x
                          map.lastY = mouse.y + parent.y
                          map.pressX = mouse.x + parent.x
                          map.pressY = mouse.y + parent.y
                          lastCoordinate = map.toCoordinate(Qt.point(mouse.x, mouse.y))
                      }

                      onPositionChanged: {
                          if (mouse.button == Qt.LeftButton) {
                              map.lastX = mouse.x + parent.x
                              map.lastY = mouse.y + parent.y
                          }
                      }

                      onPressAndHold:{
                          if (Math.abs(map.pressX - parent.x- mouse.x ) < map.jitterThreshold
                                  && Math.abs(map.pressY - parent.y - mouse.y ) < map.jitterThreshold) {
                              showRouteMenu(lastCoordinate);
                          }
                      }

                  }
              }
          }

          GeocodeModel {
              id: geocodeModel
              plugin: map.plugin
              onStatusChanged: {
                  if ((status == GeocodeModel.Ready) || (status == GeocodeModel.Error))
                      map.geocodeFinished()
              }
              onLocationsChanged:
              {
                  if (count == 1) {
                      map.center.latitude = get(0).coordinate.latitude
                      map.center.longitude = get(0).coordinate.longitude
                  }
              }
          }

          Component {
              id: pointDelegate

              MapCircle {
                  id: point
                  radius: 1000
                  color: "#46a2da"
                  border.color: "#190a33"
                  border.width: 2
                  smooth: true
                  opacity: 0.25
                  center: locationData.coordinate
                  MouseArea {
                      anchors.fill:parent
                      id: circleMouseArea
                      hoverEnabled: false
                      property variant lastCoordinate

                      onPressed : {
                          map.lastX = mouse.x + parent.x
                          map.lastY = mouse.y + parent.y
                          map.pressX = mouse.x + parent.x
                          map.pressY = mouse.y + parent.y
                          lastCoordinate = map.toCoordinate(Qt.point(mouse.x, mouse.y))
                      }

                      onPositionChanged: {
                          if (Math.abs(map.pressX - parent.x- mouse.x ) > map.jitterThreshold ||
                                  Math.abs(map.pressY - parent.y -mouse.y ) > map.jitterThreshold) {
                              if (pressed) parent.radius = parent.center.distanceTo(
                                               map.toCoordinate(Qt.point(mouse.x, mouse.y)))
                          }
                          if (mouse.button == Qt.LeftButton) {
                              map.lastX = mouse.x + parent.x
                              map.lastY = mouse.y + parent.y
                          }
                      }

                      onPressAndHold:{
                          if (Math.abs(map.pressX - parent.x- mouse.x ) < map.jitterThreshold
                                  && Math.abs(map.pressY - parent.y - mouse.y ) < map.jitterThreshold) {
                              showPointMenu(lastCoordinate);
                          }
                      }
                  }
              }
          }

          MapItemView {
              model: routeModel
              delegate: routeDelegate
              autoFitViewport: true
          }

          MapItemView {
              model: geocodeModel
              delegate: pointDelegate
          }

          Timer {
              id: scaleTimer
              interval: 100
              running: false
              repeat: false
              onTriggered: {
                  map.calculateScale()
              }
          }

          MouseArea {
              id: mouseArea
              property variant lastCoordinate
              anchors.fill: parent
              acceptedButtons: Qt.LeftButton | Qt.RightButton

              onPressed : {
                  map.lastX = mouse.x
                  map.lastY = mouse.y
                  map.pressX = mouse.x
                  map.pressY = mouse.y
                  lastCoordinate = map.toCoordinate(Qt.point(mouse.x, mouse.y))
              }

              onPositionChanged: {
                  if (mouse.button == Qt.LeftButton) {
                      map.lastX = mouse.x
                      map.lastY = mouse.y
                  }
              }

              onDoubleClicked: {
                  var mouseGeoPos = map.toCoordinate(Qt.point(mouse.x, mouse.y));
                  var preZoomPoint = map.fromCoordinate(mouseGeoPos, false);
                  if (mouse.button === Qt.LeftButton) {
                      map.zoomLevel = Math.floor(map.zoomLevel + 1)
                  } else if (mouse.button === Qt.RightButton) {
                      map.zoomLevel = Math.floor(map.zoomLevel - 1)
                  }
                  var postZoomPoint = map.fromCoordinate(mouseGeoPos, false);
                  var dx = postZoomPoint.x - preZoomPoint.x;
                  var dy = postZoomPoint.y - preZoomPoint.y;

                  var mapCenterPoint = Qt.point(map.width / 2.0 + dx, map.height / 2.0 + dy);
                  map.center = map.toCoordinate(mapCenterPoint);

                  lastX = -1;
                  lastY = -1;
              }

              onPressAndHold:{
                  if (Math.abs(map.pressX - mouse.x ) < map.jitterThreshold
                          && Math.abs(map.pressY - mouse.y ) < map.jitterThreshold) {
                      showMainMenu(lastCoordinate);
                  }
              }
          }
      }