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How to save and retrieve Matrix4 object of flutter's Vector_math library?
Saving an Object (Data persistence)How to save as a new file and keep working on the original one in Vim?How to define a two-dimensional array in PythonSql Server 'Saving changes is not permitted' error ► Prevent saving changes that require table re-creationMatrix mirror and scaleWhat is the difference between --save and --save-dev?Picture is 10x bigger in datastorage after manipulationCalculating Svg <g> tag widthFlutter : Bad state: Stream has already been listened toResetting a Stream to clear any Snapshot errors
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty height:90px;width:728px;box-sizing:border-box;
I have ValueNotifier which is initialized with Matrix4. I can transform my view. Now I want to somehow save the current value of ValueNotifier in SQLite and again on loading initialize my ValueNotifier with saved Matrix4 value. Below is code:
ValueNotifier<Matrix4> notifier = ValueNotifier(Matrix4.identity());
MatrixGestureDetector(
onMatrixUpdate: (matrix, translationMatrix, scaleMatrix, rotationMatrix)
notifier.value = matrix;
,
child: AnimatedBuilder(animation: notifier,
builder: (context, child)
return Transform(
transform: notifier.value,
child: Container(
width: width,
height: height,
color: Colors.yellow,
),
);
),
)
matrix
flutter save edited Mar 24 at 22:53
mirkancal
6071518
asked Mar 24 at 14:08
Ankur PrakashAnkur Prakash
16010
add a comment |
I have ValueNotifier which is initialized with Matrix4. I can transform my view. Now I want to somehow save the current value of ValueNotifier in SQLite and again on loading initialize my ValueNotifier with saved Matrix4 value. Below is code:
ValueNotifier<Matrix4> notifier = ValueNotifier(Matrix4.identity());
MatrixGestureDetector(
onMatrixUpdate: (matrix, translationMatrix, scaleMatrix, rotationMatrix)
notifier.value = matrix;
,
child: AnimatedBuilder(animation: notifier,
builder: (context, child)
return Transform(
transform: notifier.value,
child: Container(
width: width,
height: height,
color: Colors.yellow,
),
);
),
)
matrix
flutter save edited Mar 24 at 22:53
mirkancal
6071518
asked Mar 24 at 14:08
Ankur PrakashAnkur Prakash
16010
add a comment |
I have ValueNotifier which is initialized with Matrix4. I can transform my view. Now I want to somehow save the current value of ValueNotifier in SQLite and again on loading initialize my ValueNotifier with saved Matrix4 value. Below is code:
ValueNotifier<Matrix4> notifier = ValueNotifier(Matrix4.identity());
MatrixGestureDetector(
onMatrixUpdate: (matrix, translationMatrix, scaleMatrix, rotationMatrix)
notifier.value = matrix;
,
child: AnimatedBuilder(animation: notifier,
builder: (context, child)
return Transform(
transform: notifier.value,
child: Container(
width: width,
height: height,
color: Colors.yellow,
),
);
),
)
matrix
flutter save edited Mar 24 at 22:53
mirkancal
6071518
asked Mar 24 at 14:08
Ankur PrakashAnkur Prakash
16010
I have ValueNotifier which is initialized with Matrix4. I can transform my view. Now I want to somehow save the current value of ValueNotifier in SQLite and again on loading initialize my ValueNotifier with saved Matrix4 value. Below is code:
ValueNotifier<Matrix4> notifier = ValueNotifier(Matrix4.identity());
MatrixGestureDetector(
onMatrixUpdate: (matrix, translationMatrix, scaleMatrix, rotationMatrix)
notifier.value = matrix;
,
child: AnimatedBuilder(animation: notifier,
builder: (context, child)
return Transform(
transform: notifier.value,
child: Container(
width: width,
height: height,
color: Colors.yellow,
),
);
),
)
matrix
flutter save matrix
flutter save edited Mar 24 at 22:53
mirkancal
6071518
asked Mar 24 at 14:08
Ankur PrakashAnkur Prakash
16010
edited Mar 24 at 22:53
mirkancal
6071518
asked Mar 24 at 14:08
Ankur PrakashAnkur Prakash
16010
edited Mar 24 at 22:53
mirkancal
6071518
edited Mar 24 at 22:53
mirkancal
6071518
edited Mar 24 at 22:53
mirkancal
6071518
6071518
asked Mar 24 at 14:08
Ankur PrakashAnkur Prakash
16010
asked Mar 24 at 14:08
Ankur PrakashAnkur Prakash
16010
asked Mar 24 at 14:08
Ankur PrakashAnkur Prakash
16010
16010
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
Matrix4 has a getter storage which returns an list of 16 doubles. It also has named constructors (.fromList and .fromFloat64List) as well as the normal constructor (which takes 16 individual doubles) which will construct a Matrix4 back from its component parts.
Depending on how you'd like to store the data in SQLite you could use a combination of these. If you wanted to store all 16 doubles as columns in the database, use storage[0], storage[1], ... as your column values. You might also want to store it a character-separated string of 16 values. You could print append all 16 values with List.join(' ') and parse them back out with String.split(' ').
The most efficient way (but least human readable) is probably to store it as a BLOB of 128 bytes. Use matrix.storage.buffer.asUint8List() to convert matrix to bytes, and use Matrix4.fromBuffer(bytes.buffer, 0) to construct a matrix from a Uint8List called bytes.
answered Mar 24 at 15:03
Richard HeapRichard Heap
10k21424
add a comment |
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1 Answer
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active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Matrix4 has a getter storage which returns an list of 16 doubles. It also has named constructors (.fromList and .fromFloat64List) as well as the normal constructor (which takes 16 individual doubles) which will construct a Matrix4 back from its component parts.
Depending on how you'd like to store the data in SQLite you could use a combination of these. If you wanted to store all 16 doubles as columns in the database, use storage[0], storage[1], ... as your column values. You might also want to store it a character-separated string of 16 values. You could print append all 16 values with List.join(' ') and parse them back out with String.split(' ').
The most efficient way (but least human readable) is probably to store it as a BLOB of 128 bytes. Use matrix.storage.buffer.asUint8List() to convert matrix to bytes, and use Matrix4.fromBuffer(bytes.buffer, 0) to construct a matrix from a Uint8List called bytes.
answered Mar 24 at 15:03
Richard HeapRichard Heap
10k21424
add a comment |
Matrix4 has a getter storage which returns an list of 16 doubles. It also has named constructors (.fromList and .fromFloat64List) as well as the normal constructor (which takes 16 individual doubles) which will construct a Matrix4 back from its component parts.
Depending on how you'd like to store the data in SQLite you could use a combination of these. If you wanted to store all 16 doubles as columns in the database, use storage[0], storage[1], ... as your column values. You might also want to store it a character-separated string of 16 values. You could print append all 16 values with List.join(' ') and parse them back out with String.split(' ').
The most efficient way (but least human readable) is probably to store it as a BLOB of 128 bytes. Use matrix.storage.buffer.asUint8List() to convert matrix to bytes, and use Matrix4.fromBuffer(bytes.buffer, 0) to construct a matrix from a Uint8List called bytes.
answered Mar 24 at 15:03
Richard HeapRichard Heap
10k21424
add a comment |
Matrix4 has a getter storage which returns an list of 16 doubles. It also has named constructors (.fromList and .fromFloat64List) as well as the normal constructor (which takes 16 individual doubles) which will construct a Matrix4 back from its component parts.
Depending on how you'd like to store the data in SQLite you could use a combination of these. If you wanted to store all 16 doubles as columns in the database, use storage[0], storage[1], ... as your column values. You might also want to store it a character-separated string of 16 values. You could print append all 16 values with List.join(' ') and parse them back out with String.split(' ').
The most efficient way (but least human readable) is probably to store it as a BLOB of 128 bytes. Use matrix.storage.buffer.asUint8List() to convert matrix to bytes, and use Matrix4.fromBuffer(bytes.buffer, 0) to construct a matrix from a Uint8List called bytes.
answered Mar 24 at 15:03
Richard HeapRichard Heap
10k21424
Matrix4 has a getter storage which returns an list of 16 doubles. It also has named constructors (.fromList and .fromFloat64List) as well as the normal constructor (which takes 16 individual doubles) which will construct a Matrix4 back from its component parts.
Depending on how you'd like to store the data in SQLite you could use a combination of these. If you wanted to store all 16 doubles as columns in the database, use storage[0], storage[1], ... as your column values. You might also want to store it a character-separated string of 16 values. You could print append all 16 values with List.join(' ') and parse them back out with String.split(' ').
The most efficient way (but least human readable) is probably to store it as a BLOB of 128 bytes. Use matrix.storage.buffer.asUint8List() to convert matrix to bytes, and use Matrix4.fromBuffer(bytes.buffer, 0) to construct a matrix from a Uint8List called bytes.
answered Mar 24 at 15:03
Richard HeapRichard Heap
10k21424
answered Mar 24 at 15:03
Richard HeapRichard Heap
10k21424
answered Mar 24 at 15:03
Richard HeapRichard Heap
10k21424
answered Mar 24 at 15:03
Richard HeapRichard Heap
10k21424
10k21424
add a comment |
add a comment |
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