Compass about nativescript-google-maps-sdk HOT 2 CLOSED

function lowPass(input, output) {
    if(output.length == 0) return input;
    for (var i = 0; i < input.length; i++) {
       output[i] = output[i] + 0.2 * (input[i] - output[i]);
    }
    return output
}

function onMapReady(args) {
    console.log("onMapReady");

    var mapView = args.object;

    console.log("Setting a marker...");

    var marker = new mapsModule.Marker();
    marker.position = mapsModule.Position.positionFromLatLng(40.958637, 29.080519);
    marker.title = "İstanbul";
    marker.snippet = "Türkiye";
    // marker.icon = "~/images/navigation_icon.png";
    var icon = new Image();
    var bearing = 0
    var output = []
    icon.imageSource = imageSource.fromResource('navigation_icon');
    marker.icon = icon;
    marker.userData = { index: 1 };
    mapView.addMarker(marker);     
    // start
    var windowManager = application.android.context.getSystemService(android.content.Context.WINDOW_SERVICE);
    var sensorManager = application.android.foregroundActivity.getSystemService(android.content.Context.SENSOR_SERVICE);
    var listener = new android.hardware.SensorEventListener({
        onAccuracyChanged: (sensor, accuracy) => {
           // console.dir(accuracy)
        },
        onSensorChanged: (event) => {
            var oldValue = Math.round(output[0])
            output = lowPass(event.values, output);       

            switch ( windowManager.getDefaultDisplay().getRotation()) {
                case Surface.ROTATION_90:
                    output[0] = output[0] + 90;
                    break;
                case Surface.ROTATION_180:
                    output[0] = output[0] + 180;
                    break;
                case Surface.ROTATION_270:
                    output[0] = output[0] - 90;
                    break;
            } 

            if(Math.abs(Math.round(output[0]) - bearing) < 8) {
                //console.log("return ")
                return
            }
            bearing = Math.round(output[0])            
            mapView.set("bearing", bearing);
            //console.log("---------------------------")
            //console.log(" oldValue:" + oldValue)
            //console.log(" bearing: " + bearing)
            //console.log(" dif:     " + Math.abs(oldValue - bearing))
            //console.log("---------------------------")
        }
    });
    var surface = sensorManager.getDefaultSensor(android.hardware.Sensor.TYPE_ORIENTATION)
    sensorManager.registerListener(listener, surface, 500)
}