capturePhoto method

Future<Uint8List> capturePhoto({ double cropLeft = 0, double cropTop = 0, double cropRight = 1, double cropBottom = 1, })

Capture a JPEG still from the current camera frame. Returns the JPEG bytes, or throws if the camera is not ready.

The preview is rendered aspect-fill (cover) inside the platform view, while the still capture comes from the full camera frame — so by default the saved photo contains more than what is visible on screen. Pass the visible viewport (normalized 0,1 rect in preview coordinates) to have native crop the still to exactly what the user sees. (0,0,1,1) = no crop.

Implementation

Future<Uint8List> capturePhoto({
  double cropLeft = 0,
  double cropTop = 0,
  double cropRight = 1,
  double cropBottom = 1,
}) async {
  final ch = _channel;
  if (ch == null) throw StateError('MultiTaskYOLOView is not attached');
  final bool fullFrame =
      cropLeft <= 0 && cropTop <= 0 && cropRight >= 1 && cropBottom >= 1;
  final result = await ch.invokeMethod<Uint8List>(
    'capturePhoto',
    fullFrame
        ? null
        : {
            'cropLeft': cropLeft,
            'cropTop': cropTop,
            'cropRight': cropRight,
            'cropBottom': cropBottom,
          },
  );
  if (result == null) throw StateError('capturePhoto returned null');
  return result;
}