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);
             }
         }
     }
 }