// Provide touch focus in the viewfinder.
async void focus_Tapped(object sender, GestureEventArgs e)
{
if (cam == null)
{
return;
}
Point uiTapPoint = e.GetPosition(viewfinderCanvas);
if (PhotoCaptureDevice.IsFocusRegionSupported(cam.SensorLocation))
{
Size _focusRegionSize = new Size(100, 100);
// Get tap coordinates as a foundation point
Windows.Foundation.Point tapPoint = new Windows.Foundation.Point(uiTapPoint.X, uiTapPoint.Y);
double xRatio = viewfinderCanvas.ActualHeight / cam.PreviewResolution.Width;
double yRatio = viewfinderCanvas.ActualWidth / cam.PreviewResolution.Height;
// adjust to center focus on the tap point
Windows.Foundation.Point displayOrigin = new Windows.Foundation.Point(
tapPoint.Y - _focusRegionSize.Width / 2, (viewfinderCanvas.ActualWidth - tapPoint.X) - _focusRegionSize.Height / 2);
// adjust for resolution difference between preview image and the canvas
Windows.Foundation.Point viewFinderOrigin = new Windows.Foundation.Point(displayOrigin.X / xRatio, displayOrigin.Y / yRatio);
Rect focusrect = new Rect(viewFinderOrigin, _focusRegionSize);
// clip to preview resolution
Rect viewPortRect = new Rect(0, 0, cam.PreviewResolution.Width, cam.PreviewResolution.Height);
focusrect.Intersect(viewPortRect);
cam.FocusRegion = focusrect;
// show a focus indicator
//focusBrackets.SetValue(Shape.StrokeProperty, new SolidColorBrush(Colors.Blue));
focusBrackets.Visibility = Visibility.Visible;
focusBrackets.SetValue(Canvas.LeftProperty, uiTapPoint.X - _focusRegionSize.Width / 2);
focusBrackets.SetValue(Canvas.TopProperty, uiTapPoint.Y - _focusRegionSize.Height / 2);
CameraFocusStatus status = await cam.FocusAsync();
if (status == CameraFocusStatus.Locked)
{
//focusBrackets.SetValue(Shape.StrokeProperty, new SolidColorBrush(Colors.Green));
cam.SetProperty(KnownCameraPhotoProperties.LockedAutoFocusParameters, AutoFocusParameters.Focus);
}
else
{
cam.SetProperty(KnownCameraPhotoProperties.LockedAutoFocusParameters, AutoFocusParameters.None);
}
}
}
public async Task AutoFocusAsync()
{
if (!_isInitialized || !_isFocused && PhotoCaptureDevice.IsFocusSupported(Device.SensorLocation))
{
SendFocused(new FocusedEventArgs(CameraFocusStatus.NotLocked));
CameraFocusStatus focusState = await Device.FocusAsync();
_isFocused = focusState == CameraFocusStatus.Locked;
SendFocused(new FocusedEventArgs(focusState));
}
}
/// <summary>
/// Set autofocus area to tap location and refocus.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private async void videoCanvas_Tap(object sender, GestureEventArgs e)
{
System.Windows.Point uiTapPoint = e.GetPosition(VideoCanvas);
if (PhotoCaptureDevice.IsFocusRegionSupported(_dataContext.Device.SensorLocation) && _focusSemaphore.WaitOne(0))
{
// Get tap coordinates as a foundation point
Windows.Foundation.Point tapPoint = new Windows.Foundation.Point(uiTapPoint.X, uiTapPoint.Y);
double xRatio = VideoCanvas.ActualHeight / _dataContext.Device.PreviewResolution.Width;
double yRatio = VideoCanvas.ActualWidth / _dataContext.Device.PreviewResolution.Height;
// adjust to center focus on the tap point
Windows.Foundation.Point displayOrigin = new Windows.Foundation.Point(
tapPoint.Y - _focusRegionSize.Width / 2,
(VideoCanvas.ActualWidth - tapPoint.X) - _focusRegionSize.Height / 2);
// adjust for resolution difference between preview image and the canvas
Windows.Foundation.Point viewFinderOrigin = new Windows.Foundation.Point(displayOrigin.X / xRatio, displayOrigin.Y / yRatio);
Windows.Foundation.Rect focusrect = new Windows.Foundation.Rect(viewFinderOrigin, _focusRegionSize);
// clip to preview resolution
Windows.Foundation.Rect viewPortRect = new Windows.Foundation.Rect(0, 0, _dataContext.Device.PreviewResolution.Width, _dataContext.Device.PreviewResolution.Height);
focusrect.Intersect(viewPortRect);
_dataContext.Device.FocusRegion = focusrect;
// show a focus indicator
FocusIndicator.SetValue(Shape.StrokeProperty, _notFocusedBrush);
FocusIndicator.SetValue(Canvas.LeftProperty, uiTapPoint.X - _focusRegionSize.Width / 2);
FocusIndicator.SetValue(Canvas.TopProperty, uiTapPoint.Y - _focusRegionSize.Height / 2);
FocusIndicator.SetValue(Canvas.VisibilityProperty, Visibility.Visible);
CameraFocusStatus status = await _dataContext.Device.FocusAsync();
if (status == CameraFocusStatus.Locked)
{
FocusIndicator.SetValue(Shape.StrokeProperty, _focusedBrush);
_manuallyFocused = true;
_dataContext.Device.SetProperty(KnownCameraPhotoProperties.LockedAutoFocusParameters,
AutoFocusParameters.Exposure & AutoFocusParameters.Focus & AutoFocusParameters.WhiteBalance);
}
else
{
_manuallyFocused = false;
_dataContext.Device.SetProperty(KnownCameraPhotoProperties.LockedAutoFocusParameters, AutoFocusParameters.None);
}
_focusSemaphore.Release();
}
}
private async void VideoCanvasOnTap(object sender, GestureEventArgs e)
{
try
{
System.Windows.Point uiTapPoint = e.GetPosition(VideoCanvas);
if (PhotoCaptureDevice.IsFocusRegionSupported(PhotoCaptureDevice.SensorLocation) && _focusSemaphore.WaitOne(0))
{
// Get tap coordinates as a foundation point
var tapPoint = new Windows.Foundation.Point(uiTapPoint.X, uiTapPoint.Y);
double xRatio = VideoCanvas.ActualHeight / PhotoCaptureDevice.PreviewResolution.Width;
double yRatio = VideoCanvas.ActualWidth / PhotoCaptureDevice.PreviewResolution.Height;
// adjust to center focus on the tap point
var displayOrigin = new Windows.Foundation.Point(
tapPoint.Y - _focusRegionSize.Width / 2,
(VideoCanvas.ActualWidth - tapPoint.X) - _focusRegionSize.Height / 2);
// adjust for resolution difference between preview image and the canvas
var viewFinderOrigin = new Windows.Foundation.Point(displayOrigin.X / xRatio, displayOrigin.Y / yRatio);
var focusrect = new Windows.Foundation.Rect(viewFinderOrigin, _focusRegionSize);
// clip to preview resolution
var viewPortRect = new Windows.Foundation.Rect(0, 0, PhotoCaptureDevice.PreviewResolution.Width,
PhotoCaptureDevice.PreviewResolution.Height);
focusrect.Intersect(viewPortRect);
PhotoCaptureDevice.FocusRegion = focusrect;
// show a focus indicator
FocusIndicator.SetValue(Shape.StrokeProperty, _notFocusedBrush);
FocusIndicator.SetValue(Canvas.LeftProperty, uiTapPoint.X - _focusRegionSize.Width / 2);
FocusIndicator.SetValue(Canvas.TopProperty, uiTapPoint.Y - _focusRegionSize.Height / 2);
FocusIndicator.SetValue(VisibilityProperty, Visibility.Visible);
CameraFocusStatus status = await PhotoCaptureDevice.FocusAsync();
if (status == CameraFocusStatus.Locked)
{
FocusIndicator.SetValue(Shape.StrokeProperty, _focusedBrush);
_manuallyFocused = true;
PhotoCaptureDevice.SetProperty(KnownCameraPhotoProperties.LockedAutoFocusParameters,
AutoFocusParameters.Exposure & AutoFocusParameters.Focus & AutoFocusParameters.WhiteBalance);
}
else
{
_manuallyFocused = false;
PhotoCaptureDevice.SetProperty(KnownCameraPhotoProperties.LockedAutoFocusParameters, AutoFocusParameters.None);
}
_focusSemaphore.Release();
}
await Capture();
}
catch (Exception exception)
{
Deployment.Current.Dispatcher.BeginInvoke(() =>
{
new CustomMessageDialog(
AppMessages.CaptureVideoFailed_Title,
String.Format(AppMessages.CaptureVideoFailed, exception.Message),
App.AppInformation,
MessageDialogButtons.Ok).ShowDialog();
});
}
}
public FocusedEventArgs(CameraFocusStatus state)
{
State = state;
}
public FocusedEventArgs(CameraFocusStatus state)
{
State = state;
}
