MapComponent.qml Example File

mapviewer/map/MapComponent.qml
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** Copyright (C) 2015 The Qt Company Ltd.
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** This file is part of the examples of the Qt Toolkit.
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import QtQuick 2.5
import QtQuick.Controls 1.4
import QtLocation 5.5
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

    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.activeGestures: MapGestureArea.PanGesture | MapGestureArea.FlickGesture | MapGestureArea.ZoomGesture
    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--
        }
    }

    /* @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)
    }

    Slider {
        id: zoomSlider;
        z: map.z + 3
        minimumValue: map.minimumZoomLevel;
        maximumValue: map.maximumZoomLevel;
        anchors.margins: 10
        anchors.bottom: scale.top
        anchors.top: parent.top
        anchors.right: parent.right
        orientation : Qt.Vertical
        value: map.zoomLevel
        onValueChanged: {
            map.zoomLevel = value
        }
    }

    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: {
            map.center = map.toCoordinate(Qt.point(mouse.x, mouse.y))
            if (mouse.button === Qt.LeftButton) {
                map.zoomLevel++
            } else if (mouse.button === Qt.RightButton) {
                map.zoomLevel--
            }
            lastX = -1
            lastY = -1
        }

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

© 2016 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.