QML Maps


The Map type allows the display of a map and placing objects within the map. Various points of interest can be defined and added to the map for display. Also the Map has features to control how the map is displayed. With the Map item you can center the map, zoom, pinch and make the item flickable.

The places to be added to the map are MapItems. The item's position is defined by a coordinate which includes latitude, longitude and altitude. The item is then displayed automatically after it is added to the Map.

Position on map

All position APIs are part of the QtPositioning module. The basic piece of position information is the coordinate. A coordinate encapsulates data for the latitude, longitude and altitude of the location. Altitude is in meters. It also has a method to determine distance to another coordinate. The coordinate type may also be held within a Location element, this will also have information on a bounding box size to determine sufficient proximity to the location and a location address.

Here is an example of a client that uses a position source to center a map on the current position:

import QtPositioning
import QtLocation

Rectangle {

    Map {
        id: map
        // initialize map

    PositionSource {
        onPositionChanged: {
            // center the map on the current position
            map.center = position.coordinate


Geocoding is the derivation of geographical coordinates (latitude and longitude) from other geographical references to the locations. For example, this can be a street address. Reverse geocoding is also possible with a street address being used to determine a geographical coordinate. Geocoding is performed by using the GeocodeModel type.

The following code examples are a small part of the map component in the Map Viewer (QML) example. The snippets demonstrate the declaration of the GeocodeModel component.

In the snippet we see that the [QML]{GeocodeModel} contains the plugin and two signal handlers. One for changes in status onStatusChanged and the other to update the centering of the Map object onLocationsChanged.

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

MapItemView {
    parent: view.map
    model: geocodeModel
    delegate: pointDelegate

The geocoding features are called from a higher level piece of code. In this snippet we see an Address object filled with the desired parameters.

Address {
    id :fromAddress
    street: "Sandakerveien 116"
    city: "Oslo"
    country: "Norway"
    state : ""
    postalCode: "0484"

The Address is later used in a query for the GeocodeModel to process and determine the geographical coordinates.

// send the geocode request
geocodeModel.query = fromAddress

A very important function of the Map type is navigation from one place to a destination with possible waypoints along the route. The route will be divided up into a series of segments. At the end of each segment is a vertex called a maneuver. The segments contain information about the time and distance to the end of the segment. The maneuvers contain information about what to do next, how to get onto the next segment, if there is one. So a maneuver contains navigational information, for example "turn right now".

To find a suitable route we will need to use a RouteQuery to define the selection criteria and adding any required waypoints. The RouteModel should return a list of routeSegments that defines the route to the destination complete with navigation advice at the joins between segments, called routeManeuvers

There are many options that you can add to the query to narrow the criteria. The RouteQuery properties can include

numberAlternativeRoutesThe number of alternative routes
travelModesTravel modes
routeOptimizationsRequired route optimizations
segmentDetailLevel of detail in segments
maneuverDetailLevel of detail in maneuvers between segments
waypointsA list of waypoints
excludedAreasA list of excluded areas that the route must not cross
featureTypesRelevant map features, for example highway, ferry

In the following example a default RouteQuery is declared within RouteModel.

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

The user enters some information such as the starting point of the route, some waypoints and the destination. All of these locations are waypoints so the locations from start to finish will be entered as a sequence of waypoints. Then other query properties can be set that may be specific to this trip.

// clear away any old data in the query
// add the start and end coords as waypoints on the route
routeQuery.travelModes = RouteQuery.CarTravel
routeQuery.routeOptimizations = RouteQuery.FastestRoute

The routeInfoModel ListModel is used to grab the results of the query and construct a suitable list for display.

ListView {
    interactive: true
    model: ListModel { id: routeInfoModel }
    header: RouteListHeader {}
    delegate:  RouteListDelegate{
        routeIndex.text: index + 1
        routeInstruction.text: instruction
        routeDistance.text: distance

The ListModel routeInfoModel can be filled with values using a code, that loops through the segments extracting the segment length, instruction text and distance to the next instruction. The extracted data is formatted for display as it is retrieved.

if (routeModel.count > 0) {
    for (var i = 0; i < routeModel.get(0).segments.length; i++) {
            "instruction": routeModel.get(0).segments[i].maneuver.instructionText,
             "distance": Helper.formatDistance(routeModel.get(0).segments[i].maneuver.distanceToNextInstruction)

For more information on the example see the Map Viewer (QML) example.

Zoom, Pinch and Flickable

The Map item also supports user interface interactions with the map using tactile and mouse gestures. That is features such as swiping to pan, pinching to zoom.

Enabling and configuring pinch and flickable is easy within the MapView type.

MapView {
    id: view
TapHandler {
    id: tapHandler
    property variant lastCoordinate
    acceptedButtons: Qt.LeftButton | Qt.RightButton

    onPressedChanged: (eventPoint, button) => {
        if (pressed) {
            lastCoordinate = view.map.toCoordinate(tapHandler.point.position)

    onSingleTapped: (eventPoint, button) => {
            if (button === Qt.RightButton) {

    onDoubleTapped: (eventPoint, button) => {
        var preZoomPoint = view.map.toCoordinate(eventPoint.position);
        if (button === Qt.LeftButton) {
            view.map.zoomLevel = Math.floor(view.map.zoomLevel + 1)
        } else if (button === Qt.RightButton) {
            view.map.zoomLevel = Math.floor(view.map.zoomLevel - 1)
        var postZoomPoint = view.map.toCoordinate(eventPoint.position);
        var dx = postZoomPoint.latitude - preZoomPoint.latitude;
        var dy = postZoomPoint.longitude - preZoomPoint.longitude;

        view.map.center = QtPositioning.coordinate(view.map.center.latitude - dx,
                                                   view.map.center.longitude - dy);

Zoom can also be controlled by other objects like sliders, with binding to the Map zoomLevel.

QML Types



A model to represent, load and save GeoJSON documents


Type displays a map


Type displays a geographic circle on a Map


Item displays the current valid copyright notice for a Map element


Type is a container for map items


Used to populate Map from a model


Type displays a polygon on a Map


Type displays a polyline on a map


Type displays an arbitrary Qt Quick object on a Map


Type displays a rectangle on a Map


Type displays a Route on a Map


Type holds information about the camera capabilities for a specific map type


Type holds information about a map type



Type provides support for searching operations related to geographic information



Type provides access to routes


Type is used to provide query parameters to a RouteModel


Type represents one geographical route


Type represents the information relevant to the point at which two routeSegments meet


Type represents a segment of a Route


The above snippets are taken from the Map Viewer (QML) example.

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