private string GetFaceDescriptionFromMousePosition(MouseMovePayload param)
{
var result = string.Empty;
var faces = _faceAPIService.DetectedFaces();
var faceDescriptions = _faceAPIService.DetectedFacesDescriptions();
var resizeFactor = _faceAPIService.GetResizeFactor();
try
{
// If the REST call has not completed, return from this method.
if (faces != null)
{
var FacePhotoImage = (Image)param.Sender;
// Find the mouse position relative to the image.
var mouseXY = param.Args.GetPosition(FacePhotoImage);
var imageSource = FacePhotoImage.Source;
var bitmapSource = (BitmapSource)imageSource;
// Scale adjustment between the actual size and displayed size.
var scale = FacePhotoImage.ActualWidth / (bitmapSource.PixelWidth / resizeFactor);
// Check if this mouse position is over a face rectangle.
var mouseOverFace = false;
for (var i = 0; i < faces.Length; ++i)
{
var fr = faces[i].FaceRectangle;
var left = fr.Left * scale;
var top = fr.Top * scale;
var width = fr.Width * scale;
var height = fr.Height * scale;
// Display the face description for this face if the mouse is over this face rectangle.
if (mouseXY.X >= left && mouseXY.X <= left + width && mouseXY.Y >= top && mouseXY.Y <= top + height)
{
result = faceDescriptions[i];
mouseOverFace = true;
break;
}
}
// If the mouse is not over a face rectangle.
if (!mouseOverFace)
{
result = "Place the mouse pointer over a face to see the face description.";
}
}
}
// Catch and display other errors.
catch (Exception e)
{
var message = e.Message;
}
return(result);
}
static void ElementMouseMove(object sender, MouseEventArgs e)
{
var mouseMovePayload = new MouseMovePayload();
mouseMovePayload.Sender = sender;
mouseMovePayload.Args = e;
var element = (FrameworkElement)sender;
var command = GetMouseMoveCommand(element);
command.Execute(mouseMovePayload);
}
/// <summary>
/// Showing face description if mouse position is over a face rectangle.
/// </summary>
/// <param name="faces"></param>
/// <param name="faceDescriptions"></param>
/// <param name="resizeFactor"></param>
/// <param name="param"></param>
/// <returns></returns>
public string FaceDescriptionFromMousePosition(MouseMovePayload param)
{
return(GetFaceDescriptionFromMousePosition(param));
}
