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ArcGIS Runtime SDK for Qt

Show location history

Sample Viewer View Sample on GitHub

Display your location history on the map.

Use case

You can track device location history and display it as lines and points on the map. The history can be used to visualize how the user moved through the world, to retrace their steps, or to create new feature geometry. An unmapped trail, for example, could be added to the map using this technique.

How to use the sample

Click 'Start tracking' to start tracking your location, which will appear as points on the map. A line will connect the points for easier visualization. Click 'Stop tracking' to stop updating the location history. This sample uses a simulated data source to allow the sample to be useful on desktop/non-mobile devices. To track a user's real position, use the DefaultLocationDataSource instead.

How it works

  1. If necessary, request location permission from the operating system.
  2. Create a graphics overlay to show each point and another graphics overlay for displaying the route line.
  3. Create a SimulatedLocationDataSource and initialize it with a polyline. Start the SimulatedLocationDataSource to begin receiving location updates.
    • NOTE: To track a user's real position, use DefaultLocationDataSource instead.
  4. Connect to the LocationDisplay's LocationChanged signal to handle location updates.
  5. Every time the location updates, store that location, display a point on the map, and re-create the route line.

Relevant API

  • Location.position
  • LocationDisplay.autoPanMode
  • LocationDisplay.dataSource
  • LocationDisplay.locationChanged
  • MapView.locationDisplay
  • SimulatedLocationDataSource

About the data

A custom set of points is used to create a Polyline and initialize a SimulatedLocationDataSource. This simulated location data source enables easier testing and allows the sample to be used on devices without an actively updating GPS signal.

Tags

bread crumb, breadcrumb, GPS, history, movement, navigation, real-time, trace, track, trail

Sample Code

import QtQuick 2.6
import QtQuick.Controls 2.2
import Esri.ArcGISRuntime 100.9

Rectangle {
    id: rootRectangle
    clip: true
    width: 800
    height: 600

    readonly property int initialZoomScale: 8000
    property bool trackingEnabled: false
    property Point lastPosition: null

    // add a mapView component
    MapView {
        anchors.fill: parent

        Map {
            BasemapDarkGrayCanvasVector {}
        }

        // set initial viewpoint near UCLA, Los Angeles
        ViewpointCenter {
            Point {
                x: -13185535.98
                y: 4037766.28
            }
            targetScale: initialZoomScale
        }

        Button {
            id: button
            text: trackingEnabled ? "Stop tracking" : "Start tracking"
            anchors.horizontalCenter: parent.horizontalCenter
            width: 200
            onClicked: trackingEnabled =! trackingEnabled
        }

        SimulationParameters {
            id: simulationParameters
            velocity: 30
        }

        locationDisplay {
            dataSource: SimulatedLocationDataSource {
                id: simulatedLocationDataSource
                Component.onCompleted: {
                    setLocationsWithPolylineAndParameters(polyline, simulationParameters);
                    simulatedLocationDataSource.start();
                }
            }
            initialZoomScale: initialZoomScale
        }

        // if tracking is enabled then show location history
        locationDisplay.onLocationChanged: {
            if (!trackingEnabled)
                return;

            // clear old route
            locationHistoryLineOverlay.graphics.clear();

            if (lastPosition !== null) {
                polylineBuilder.addPoint(lastPosition);
                locationHistoryOverlay.graphics.append(ArcGISRuntimeEnvironment.createObject("Graphic", {geometry: lastPosition}));
            }

            // update last position
            lastPosition = locationDisplay.location.position;

            // update the polyline
            locationHistoryLineOverlay.graphics.append(ArcGISRuntimeEnvironment.createObject("Graphic", {geometry: polylineBuilder.geometry}));
        }

        Component.onCompleted: {
            locationDisplay.autoPanMode = Enums.LocationDisplayAutoPanModeRecenter;
        }

        Polyline {
            id: polyline
            json: {"paths":[[[-13185646.046666779,4037971.5966668758],[-13185586.780000051,4037827.6633333955],
                             [-13185514.813333312,4037709.1299999417],[-13185569.846666701,4037522.8633330846],
                             [-13185591.01333339,4037378.9299996048],[-13185629.113333428,4037283.6799995075],
                             [-13185770.93000024,4037425.4966663187],[-13185821.730000293,4037546.146666442],
                             [-13185880.996667018,4037704.8966666036],[-13185948.730000421,4037874.2300001099],
                             [-13185974.130000448,4037946.1966668498],[-13186120.180000596,4037958.896666863],
                             [-13186264.113334076,4037984.296666889],[-13186336.080000836,4038001.2300002342],
                             [-13186314.91333415,4037757.8133333195],[-13186272.580000773,4037560.9633331187],
                             [-13186187.913334005,4037463.59666635],[-13186431.33000092,4037404.3299996229],
                             [-13186676.863334503,4037290.0299995062],[-13187625.130002158,4038589.6633341513],
                             [-13187333.030001862,4038756.8800009824],[-13187091.730001617,4038617.1800008402],
                             [-13186791.163334643,4038805.5633343654],[-13186721.313334571,4038801.3300010278],
                             [-13186833.49666802,4038195.9633337436],[-13186977.677439401,4037699.8176972247],
                             [-13186784.921301765,4037820.4541915278],[-13186749.517113185,4038150.8932846226],
                             [-13186649.860878762,4038288.5762400767],[-13186556.760975549,4038323.9804286221],
                             [-13186472.839936033,4038481.3323777127],[-13186373.183701571,4038489.1999751539],
                             [-13186344.335844241,4038242.6819215398],[-13186126.665647998,4038308.245233661],
                             [-13185814.584282301,4038358.0733508728],[-13185651.987268206,4038116.8003622484],
                             [-13185203.534213299,4038048.6145176427],[-13184576.748949422,4038150.8932845518],
                             [-13184251.55492135,4037833.5668537691],[-13184146.653621957,4037524.1080205571],
                             [-13183949.963685593,4037621.1417224966],[-13183687.71043711,4037781.1162040718],
                             [-13183480.530370807,4037875.5273735262],[-13182307.629999243,4037859.7460188437],
                             [-13181376.039484169,4037820.9297473822],[-13180716.162869323,4038364.3575478429],
                             [-13180182.439136729,4038810.7446696493],[-13178474.523192419,4040237.2426458625],
                             [-13178321.134040033,4039740.6894803117],[-13177958.020228144,4039140.1550991111],
                             [-13177073.512224896,4037459.5898928214],[-13177757.842101147,4037589.9384406791],
                             [-13178386.308314031,4037799.427178307],[-13180095.012208173,4037811.6550856642],
                             [-13180126.165447287,4036845.9046731163],[-13179806.844746364,4036324.0879179495],
                             [-13180928.361354485,4035887.9425703473],[-13181598.155995468,4035428.432293402],
                             [-13182984.47513606,4034447.105261297],[-13182229.264383668,4033222.8051626245],
                             [-13182058.735615831,4033339.8690072047],[-13181939.035180708,4033691.2477038498],
                             [-13182116.65518121,4033861.1450956347],[-13181792.305615077,4034085.1007484416],
                             [-13182027.845180977,4034467.3698799671],[-13181877.254310986,4034644.9898804692],
                             [-13181630.130832028,4034517.5668366305],[-13181386.868657427,4034424.8955320208],
                             [-13181228.555178719,4034652.7124891868],[-13181379.14604871,4034942.3103160923],
                             [-13181267.168222306,4035189.4337950516],[-13181074.103004368,4035015.6750989081],
                             [-13180807.673003616,4034934.5877073747],[-13180618.469090037,4034814.8872722536],
                             [-13180599.162568243,4035374.7764042714],[-13181047.073873857,4035494.476839392],
                             [-13181317.365178969,4035413.3894478586],[-13180765.198655669,4035143.0981427468],
                             [-13180328.871263131,4034892.1133594285],[-13180270.951697765,4035258.9372735149],
                             [-13180325.009958787,4035718.4324922049],[-13180707.279090302,4035695.2646660525],
                             [-13181413.897788007,4035536.9511873648],[-13181618.54691902,4035807.2424924765],
                             [-13181884.976919774,4036065.949884512],[-13182159.129529245,4035861.3007534989],
                             [-13182174.57474668,4035668.2355355616],[-13182417.83692128,4035664.374231203],
                             [-13182784.660835361,4035409.5281435261],[-13182997.032575091,4035255.0759691764],
                             [-13182618.624747934,4034679.7416197238]]],
                "spatialReference":{"latestWkid":3857,"wkid":102100}}
        }

        GraphicsOverlay {
            id: locationHistoryLineOverlay
            SimpleRenderer {
                SimpleLineSymbol {
                    color: "lime"
                    style: Enums.SimpleLineSymbolStyleSolid
                    width: 2
                }
            }
        }

        GraphicsOverlay {
            id: locationHistoryOverlay
            SimpleRenderer {
                SimpleMarkerSymbol {
                    color: "red"
                    style: Enums.SimpleMarkerSymbolStyleCircle
                    size: 3
                }
            }
        }
    }

    PolylineBuilder {
        id: polylineBuilder
        spatialReference: SpatialReference { wkid: 3857 }
    }
}