public View ViewForTrackedBarcode(BarcodeTrackingAdvancedOverlay overlay, TrackedBarcode trackedBarcode)
{
return(this.listener?.GetOrCreateViewForBubbleData(
trackedBarcode,
this.bubbleDataProvider.GetDataForBarcode(trackedBarcode.Barcode.Data),
this.listener.ShouldShowBubble(trackedBarcode)));
}
private void SetupRecognition()
{
// Create data capture context using your license key.
this.context = DataCaptureContextExtensions.LicensedContext;
// Use the camera and set it as the frame source of the context. The camera is off by
// default and must be turned on to start streaming frames to the data capture context for recognition.
// See viewWillAppear and viewDidDisappear above.
this.context.SetFrameSourceAsync(this.camera);
// Use the recommended camera settings for the BarcodeTracking mode as default settings.
// The preferred resolution is automatically chosen, which currently defaults to HD on all devices.
// Setting the preferred resolution to full HD helps to get a better decode range.
var cameraSettings = BarcodeTracking.RecommendedCameraSettings;
cameraSettings.PreferredResolution = VideoResolution.Uhd4k;
this.camera?.ApplySettingsAsync(cameraSettings);
// The barcode tracking process is configured through barcode tracking settings
// and are then applied to the barcode tracking instance that manages barcode tracking.
var settings = BarcodeTrackingSettings.Create(BarcodeTrackingScenario.A);
// The settings instance initially has all types of barcodes (symbologies) disabled. For the purpose of this
// sample we enable a very generous set of symbologies. In your own app ensure that you only enable the
// symbologies that your app requires as every additional enabled symbology has an impact on processing times.
settings.EnableSymbologies(new HashSet <Symbology>
{
Symbology.Ean13Upca,
Symbology.Ean8,
Symbology.Upce,
Symbology.Code39,
Symbology.Code128
});
// Create new barcode tracking mode with the settings from above.
this.barcodeTracking = BarcodeTracking.Create(this.context, settings);
this.barcodeTracking.AddListener(this);
// To visualize the on-going barcode tracking process on screen, setup a data capture view that renders the
// camera preview. The view must be connected to the data capture context.
this.captureView = DataCaptureView.Create(this.context, this.View.Bounds);
this.captureView.AutoresizingMask = UIViewAutoresizing.FlexibleWidth | UIViewAutoresizing.FlexibleHeight;
this.View.AddSubview(this.captureView);
this.View.SendSubviewToBack(this.captureView);
// Add a barcode tracking overlay to the data capture view to render the tracked barcodes on top of the video
// preview. This is optional, but recommended for better visual feedback. The overlay is automatically added
// to the view.
this.basicOverlay = BarcodeTrackingBasicOverlay.Create(this.barcodeTracking, this.captureView);
this.basicOverlay.Listener = this;
// Add another barcode tracking overlay to the data capture view to render other views. The overlay is
// automatically added to the view.
this.advancedOverlay = BarcodeTrackingAdvancedOverlay.Create(this.barcodeTracking, this.captureView);
this.advancedOverlay.Listener = this;
}
public PointWithUnit OffsetForTrackedBarcode(
BarcodeTrackingAdvancedOverlay overlay,
TrackedBarcode trackedBarcode,
View view)
{
// We want to center the view on top of the barcode.
return(new PointWithUnit(
new FloatWithUnit(0f, MeasureUnit.Fraction),
new FloatWithUnit(-1f, MeasureUnit.Fraction)));
}
public PointWithUnit OffsetForTrackedBarcode(BarcodeTrackingAdvancedOverlay overlay, TrackedBarcode trackedBarcode)
{
// We set the offset's height to be equal of the 100 percent of our overlay.
// The minus sign means that the overlay will be above the barcode.
return(new PointWithUnit()
{
X = new FloatWithUnit()
{
Value = 0,
Unit = MeasureUnit.Fraction
},
Y = new FloatWithUnit()
{
Value = -1,
Unit = MeasureUnit.Fraction
}
});
}
public Anchor AnchorForTrackedBarcode(BarcodeTrackingAdvancedOverlay overlay, TrackedBarcode trackedBarcode)
{
// The offset of our overlay will be calculated from the top center anchoring point.
return(Anchor.TopCenter);
}
public UIView ViewForTrackedBarcode(BarcodeTrackingAdvancedOverlay overlay, TrackedBarcode trackedBarcode)
{
return(CreateStockOverlay(trackedBarcode));
}
public Anchor AnchorForTrackedBarcode(
BarcodeTrackingAdvancedOverlay overlay,
TrackedBarcode trackedBarcode)
{
return(Anchor.TopCenter);
}
