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Widget buildCameraPreview(CameraController cameraController) {
final double previewAspectRatio = 0.7;
return AspectRatio(
aspectRatio: 1 / previewAspectRatio,
child: ClipRect(
child: Transform.scale(
scale: cameraController.value.aspectRatio / previewAspectRatio,
child: Center(
child: CameraPreview(cameraController),
),
),
),
);
}