Flutter 带有颤振相机和图像层的AspectRatio问题
我的颤振相机（插件“camera_camera”）存在AspectRatio问题，我在上面放了一张透明层的图像 我给你发了一个问题的截图。在截图中，你可以看到打开的相机，上面是我在它前面拍的照片。不幸的是，你可以在不同的地方看到它不匹配 我如何让相机显示出与我之前从完全相同的位置拍摄的完全相同的比例 如果这有帮助的话：我还录制了一段关于该问题的视频： 我的代码Flutter 带有颤振相机和图像层的AspectRatio问题,flutter,dart,Flutter,Dart,我的颤振相机（插件“camera_camera”）存在AspectRatio问题，我在上面放了一张透明层的图像 我给你发了一个问题的截图。在截图中，你可以看到打开的相机，上面是我在它前面拍的照片。不幸的是，你可以在不同的地方看到它不匹配 我如何让相机显示出与我之前从完全相同的位置拍摄的完全相同的比例 如果这有帮助的话：我还录制了一段关于该问题的视频： 我的代码 @override Widget build(BuildContext context) { final theme =
@override
Widget build(BuildContext context) {
final theme = Theme.of(context);
if (!controller.value.isInitialized) {
return Container(
color: theme.colorScheme.onPrimary,
child: Center(child: CircularProgressIndicator()));
}
return Scaffold(
appBar: CupertinoNavigationBar(
backgroundColor: theme.colorScheme.primary,
border: Border.symmetric(
vertical: BorderSide.none, horizontal: BorderSide.none),
automaticallyImplyLeading: false,
leading: IconButton(
icon: Icon(
Icons.chevron_left,
size: 30,
color: theme.colorScheme.onPrimary,
),
onPressed: () => Navigator.pop(context),
),
middle: Text("Memories",
style: TextStyle(
color: theme.colorScheme.onPrimary,
fontSize: theme.textTheme.headline3.fontSize)),
),
body: Container(
child: Column(
children: [
Expanded(
child: Camera(
mode: CameraMode.normal,
imageMask: lastPicture != null
? new Positioned.fill(
child: new Opacity(
opacity: 0.3,
child: RotatedBox(
quarterTurns: 1,
child: new Image.file(
File(lastPicture),
fit: BoxFit.cover,
),
),
),
)
: Container(),
onFile: (File file) {
_workWithImage(file);
},
),
),
],
),
),
);
}
@override
Widget build(BuildContext context) {
final theme = Theme.of(context);
var deviceSize = MediaQuery.of(context).size;
var sizeWidth = MediaQuery.of(context).size.width;
final deviceRatio = deviceSize.width / deviceSize.height;
var isPortrait = MediaQuery.of(context).orientation == Orientation.portrait;
return Scaffold(
backgroundColor: theme.colorScheme.primary,
appBar: CupertinoNavigationBar(
backgroundColor: theme.colorScheme.primary,
border: Border.symmetric(
vertical: BorderSide.none, horizontal: BorderSide.none),
automaticallyImplyLeading: false,
leading: IconButton(
icon: Icon(
Icons.chevron_left,
size: 30,
color: theme.colorScheme.onPrimary,
),
onPressed: () => Navigator.pop(context),
),
middle: Text(APP_NAME,
style: TextStyle(
color: theme.colorScheme.onPrimary,
fontSize: theme.textTheme.headline3.fontSize)),
),
body: NativeDeviceOrientationReader(
useSensor: true,
builder: (context) {
NativeDeviceOrientation orientation =
NativeDeviceOrientationReader.orientation(context);
return Stack(children: [
FutureBuilder<void>(
future: _initializeControllerFuture,
builder: (context, snapshot) {
if (snapshot.connectionState == ConnectionState.done) {
// If the Future is complete, display the preview.
return MeasureSize(
onChange: (size) {
setState(() {
cameraSize = size;
});
},
child: Transform.scale(
scale: cameraController.value.aspectRatio / deviceRatio,
child: Center(
child: AspectRatio(
aspectRatio: cameraController.value.aspectRatio,
child: ClipRect(
child: OverflowBox(
alignment: Alignment.center,
child: FittedBox(
fit: BoxFit.fitWidth,
child: Container(
width: sizeWidth,
height: sizeWidth /
cameraController.value.aspectRatio,
child: CameraPreview(
cameraController), // this is my CameraPreview
),
),
),
),
),
),
),
);
} else {
// Otherwise, display a loading indicator.
return Center(child: CircularProgressIndicator());
}
},
),
helpMode == true
? Transform.scale(
scale: cameraController.value.aspectRatio / deviceRatio,
child: Center(
child: Opacity(
opacity: .3,
child: orientation ==
NativeDeviceOrientation.landscapeLeft ||
orientation ==
NativeDeviceOrientation.landscapeRight
? RotatedBox(
quarterTurns: orientation ==
NativeDeviceOrientation.landscapeLeft
? 1
: 3,
child: Image.file(
File(lastPicture),
height: cameraSize.width,
fit: BoxFit.contain,
))
: Image.file(
File(lastPicture),
width: cameraSize.width,
height: cameraSize.height,
fit: BoxFit.contain,
),
),
),
)
: Container(),
]);
},
),
floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked,
floatingActionButton: Container(
transform: Matrix4.translationValues(0.0, -8.0, 0.0),
child: FloatingActionButton(
backgroundColor: theme.colorScheme.primary,
child: Icon(
Icons.camera_alt,
color: theme.colorScheme.onPrimary,
),
// Provide an onPressed callback.
onPressed: () async {
// Take the Picture in a try / catch block. If anything goes wrong,
// catch the error.
try {
// Ensure that the camera is initialized.
//await _initializeControllerFuture;
// Construct the path where the image should be saved using the path
// package.
final path = join(
// Store the picture in the temp directory.
// Find the temp directory using the `path_provider` plugin.
(await getTemporaryDirectory()).path,
'${DateTime.now()}.png',
);
// Attempt to take a picture and log where it's been saved.
await cameraController.takePicture(path);
_workWithImage(File(path));
} catch (e) {
// If an error occurs, log the error to the console.
print(e);
}
},
),
),
);
}
}
typedef void OnWidgetSizeChange(Size size);
class MeasureSize extends StatefulWidget {
final Widget child;
final OnWidgetSizeChange onChange;
const MeasureSize({
Key key,
@required this.onChange,
@required this.child,
}) : super(key: key);
@override
_MeasureSizeState createState() => _MeasureSizeState();
}
class _MeasureSizeState extends State<MeasureSize> {
@override
Widget build(BuildContext context) {
SchedulerBinding.instance.addPostFrameCallback(postFrameCallback);
return Container(
key: widgetKey,
child: widget.child,
);
}
var widgetKey = GlobalKey();
var oldSize;
void postFrameCallback(_) {
var context = widgetKey.currentContext;
if (context == null) return;
var newSize = context.size;
if (oldSize == newSize) return;
oldSize = newSize;
widget.onChange(newSize);
}
}
AspectRatio:3/4AspectRatio你有什么办法来解决这个问题吗？我找到了一个解决方案，并开始工作 示例代码
@override
Widget build(BuildContext context) {
final theme = Theme.of(context);
if (!controller.value.isInitialized) {
return Container(
color: theme.colorScheme.onPrimary,
child: Center(child: CircularProgressIndicator()));
}
return Scaffold(
appBar: CupertinoNavigationBar(
backgroundColor: theme.colorScheme.primary,
border: Border.symmetric(
vertical: BorderSide.none, horizontal: BorderSide.none),
automaticallyImplyLeading: false,
leading: IconButton(
icon: Icon(
Icons.chevron_left,
size: 30,
color: theme.colorScheme.onPrimary,
),
onPressed: () => Navigator.pop(context),
),
middle: Text("Memories",
style: TextStyle(
color: theme.colorScheme.onPrimary,
fontSize: theme.textTheme.headline3.fontSize)),
),
body: Container(
child: Column(
children: [
Expanded(
child: Camera(
mode: CameraMode.normal,
imageMask: lastPicture != null
? new Positioned.fill(
child: new Opacity(
opacity: 0.3,
child: RotatedBox(
quarterTurns: 1,
child: new Image.file(
File(lastPicture),
fit: BoxFit.cover,
),
),
),
)
: Container(),
onFile: (File file) {
_workWithImage(file);
},
),
),
],
),
),
);
}
@override
Widget build(BuildContext context) {
final theme = Theme.of(context);
var deviceSize = MediaQuery.of(context).size;
var sizeWidth = MediaQuery.of(context).size.width;
final deviceRatio = deviceSize.width / deviceSize.height;
var isPortrait = MediaQuery.of(context).orientation == Orientation.portrait;
return Scaffold(
backgroundColor: theme.colorScheme.primary,
appBar: CupertinoNavigationBar(
backgroundColor: theme.colorScheme.primary,
border: Border.symmetric(
vertical: BorderSide.none, horizontal: BorderSide.none),
automaticallyImplyLeading: false,
leading: IconButton(
icon: Icon(
Icons.chevron_left,
size: 30,
color: theme.colorScheme.onPrimary,
),
onPressed: () => Navigator.pop(context),
),
middle: Text(APP_NAME,
style: TextStyle(
color: theme.colorScheme.onPrimary,
fontSize: theme.textTheme.headline3.fontSize)),
),
body: NativeDeviceOrientationReader(
useSensor: true,
builder: (context) {
NativeDeviceOrientation orientation =
NativeDeviceOrientationReader.orientation(context);
return Stack(children: [
FutureBuilder<void>(
future: _initializeControllerFuture,
builder: (context, snapshot) {
if (snapshot.connectionState == ConnectionState.done) {
// If the Future is complete, display the preview.
return MeasureSize(
onChange: (size) {
setState(() {
cameraSize = size;
});
},
child: Transform.scale(
scale: cameraController.value.aspectRatio / deviceRatio,
child: Center(
child: AspectRatio(
aspectRatio: cameraController.value.aspectRatio,
child: ClipRect(
child: OverflowBox(
alignment: Alignment.center,
child: FittedBox(
fit: BoxFit.fitWidth,
child: Container(
width: sizeWidth,
height: sizeWidth /
cameraController.value.aspectRatio,
child: CameraPreview(
cameraController), // this is my CameraPreview
),
),
),
),
),
),
),
);
} else {
// Otherwise, display a loading indicator.
return Center(child: CircularProgressIndicator());
}
},
),
helpMode == true
? Transform.scale(
scale: cameraController.value.aspectRatio / deviceRatio,
child: Center(
child: Opacity(
opacity: .3,
child: orientation ==
NativeDeviceOrientation.landscapeLeft ||
orientation ==
NativeDeviceOrientation.landscapeRight
? RotatedBox(
quarterTurns: orientation ==
NativeDeviceOrientation.landscapeLeft
? 1
: 3,
child: Image.file(
File(lastPicture),
height: cameraSize.width,
fit: BoxFit.contain,
))
: Image.file(
File(lastPicture),
width: cameraSize.width,
height: cameraSize.height,
fit: BoxFit.contain,
),
),
),
)
: Container(),
]);
},
),
floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked,
floatingActionButton: Container(
transform: Matrix4.translationValues(0.0, -8.0, 0.0),
child: FloatingActionButton(
backgroundColor: theme.colorScheme.primary,
child: Icon(
Icons.camera_alt,
color: theme.colorScheme.onPrimary,
),
// Provide an onPressed callback.
onPressed: () async {
// Take the Picture in a try / catch block. If anything goes wrong,
// catch the error.
try {
// Ensure that the camera is initialized.
//await _initializeControllerFuture;
// Construct the path where the image should be saved using the path
// package.
final path = join(
// Store the picture in the temp directory.
// Find the temp directory using the `path_provider` plugin.
(await getTemporaryDirectory()).path,
'${DateTime.now()}.png',
);
// Attempt to take a picture and log where it's been saved.
await cameraController.takePicture(path);
_workWithImage(File(path));
} catch (e) {
// If an error occurs, log the error to the console.
print(e);
}
},
),
),
);
}
}
typedef void OnWidgetSizeChange(Size size);
class MeasureSize extends StatefulWidget {
final Widget child;
final OnWidgetSizeChange onChange;
const MeasureSize({
Key key,
@required this.onChange,
@required this.child,
}) : super(key: key);
@override
_MeasureSizeState createState() => _MeasureSizeState();
}
class _MeasureSizeState extends State<MeasureSize> {
@override
Widget build(BuildContext context) {
SchedulerBinding.instance.addPostFrameCallback(postFrameCallback);
return Container(
key: widgetKey,
child: widget.child,
);
}
var widgetKey = GlobalKey();
var oldSize;
void postFrameCallback(_) {
var context = widgetKey.currentContext;
if (context == null) return;
var newSize = context.size;
if (oldSize == newSize) return;
oldSize = newSize;
widget.onChange(newSize);
}
}
现在，图像覆盖适合相机显示的内容。您是否尝试过使用BoxFit.fitWidth而不是BoxFit.cover？