How do I draw a vector shape in Flutter?
2
We are trying to build a custom shape vector in Flutter that can be changed at runtime.
For example, we need a pizza shape vector widget that we can change the slice color base on a variable value.
We tried to use the canvas and painter in Flutter but they don't have a clear and good doc.
We tried SVG too but unfortunately Flutter doesn't support SVG tag and SVG view too.
android vector 
flutter asked Apr 17 '18 at 14:56
javad batjavad bat
444620
add a comment |
2
We are trying to build a custom shape vector in Flutter that can be changed at runtime.
For example, we need a pizza shape vector widget that we can change the slice color base on a variable value.
We tried to use the canvas and painter in Flutter but they don't have a clear and good doc.
We tried SVG too but unfortunately Flutter doesn't support SVG tag and SVG view too.
android vector flutter asked Apr 17 '18 at 14:56
javad batjavad bat
444620
add a comment |
2
2
2
We are trying to build a custom shape vector in Flutter that can be changed at runtime.
For example, we need a pizza shape vector widget that we can change the slice color base on a variable value.
We tried to use the canvas and painter in Flutter but they don't have a clear and good doc.
We tried SVG too but unfortunately Flutter doesn't support SVG tag and SVG view too.
android vector flutter asked Apr 17 '18 at 14:56
javad batjavad bat
444620
We are trying to build a custom shape vector in Flutter that can be changed at runtime.
For example, we need a pizza shape vector widget that we can change the slice color base on a variable value.
We tried to use the canvas and painter in Flutter but they don't have a clear and good doc.
We tried SVG too but unfortunately Flutter doesn't support SVG tag and SVG view too.
android vector flutter android vector flutter asked Apr 17 '18 at 14:56
javad batjavad bat
444620
asked Apr 17 '18 at 14:56
javad batjavad bat
444620
edited Jan 3 at 10:11
javad bat
asked Apr 17 '18 at 14:56
javad batjavad bat
444620
asked Apr 17 '18 at 14:56
javad batjavad bat
444620
asked Apr 17 '18 at 14:56
javad batjavad bat
444620
444620
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
3
You can create a widget that extends CustomPainter
class Sky extends CustomPainter {
@override
void paint(Canvas canvas, Size size) {
var rect = Offset.zero & size;
var gradient = new RadialGradient(
center: const Alignment(0.7, -0.6),
radius: 0.2,
colors: [const Color(0xFFFFFF00), const Color(0xFF0099FF)],
stops: [0.4, 1.0],
);
canvas.drawRect(
rect,
new Paint()..shader = gradient.createShader(rect),
);
}
@override
SemanticsBuilderCallback get semanticsBuilder {
return (Size size) {
// Annotate a rectangle containing the picture of the sun
// with the label "Sun". When text to speech feature is enabled on the
// device, a user will be able to locate the sun on this picture by
// touch.
var rect = Offset.zero & size;
var width = size.shortestSide * 0.4;
rect = const Alignment(0.8, -0.9).inscribe(new Size(width, width), rect);
return [
new CustomPainterSemantics(
rect: rect,
properties: new SemanticsProperties(
label: 'Sun',
textDirection: TextDirection.ltr,
),
),
];
};
}
// Since this Sky painter has no fields, it always paints
// the same thing and semantics information is the same.
// Therefore we return false here. If we had fields (set
// from the constructor) then we would return true if any
// of them differed from the same fields on the oldDelegate.
@override
bool shouldRepaint(Sky oldDelegate) => false;
@override
bool shouldRebuildSemantics(Sky oldDelegate) => false;
}
See also
https://pub.dartlang.org/packages/flutter_svg (limited SVG support for Flutter)- https://github.com/flutter/flutter/tree/master/dev/tools/vitool
https://github.com/simolus3/fluttie (not sure this is working already)
answered Apr 17 '18 at 15:36
Günter ZöchbauerGünter Zöchbauer
332k701006941
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
3
You can create a widget that extends CustomPainter
class Sky extends CustomPainter {
@override
void paint(Canvas canvas, Size size) {
var rect = Offset.zero & size;
var gradient = new RadialGradient(
center: const Alignment(0.7, -0.6),
radius: 0.2,
colors: [const Color(0xFFFFFF00), const Color(0xFF0099FF)],
stops: [0.4, 1.0],
);
canvas.drawRect(
rect,
new Paint()..shader = gradient.createShader(rect),
);
}
@override
SemanticsBuilderCallback get semanticsBuilder {
return (Size size) {
// Annotate a rectangle containing the picture of the sun
// with the label "Sun". When text to speech feature is enabled on the
// device, a user will be able to locate the sun on this picture by
// touch.
var rect = Offset.zero & size;
var width = size.shortestSide * 0.4;
rect = const Alignment(0.8, -0.9).inscribe(new Size(width, width), rect);
return [
new CustomPainterSemantics(
rect: rect,
properties: new SemanticsProperties(
label: 'Sun',
textDirection: TextDirection.ltr,
),
),
];
};
}
// Since this Sky painter has no fields, it always paints
// the same thing and semantics information is the same.
// Therefore we return false here. If we had fields (set
// from the constructor) then we would return true if any
// of them differed from the same fields on the oldDelegate.
@override
bool shouldRepaint(Sky oldDelegate) => false;
@override
bool shouldRebuildSemantics(Sky oldDelegate) => false;
}
See also
https://pub.dartlang.org/packages/flutter_svg (limited SVG support for Flutter)- https://github.com/flutter/flutter/tree/master/dev/tools/vitool
https://github.com/simolus3/fluttie (not sure this is working already)
answered Apr 17 '18 at 15:36
Günter ZöchbauerGünter Zöchbauer
332k701006941
add a comment |
3
You can create a widget that extends CustomPainter
class Sky extends CustomPainter {
@override
void paint(Canvas canvas, Size size) {
var rect = Offset.zero & size;
var gradient = new RadialGradient(
center: const Alignment(0.7, -0.6),
radius: 0.2,
colors: [const Color(0xFFFFFF00), const Color(0xFF0099FF)],
stops: [0.4, 1.0],
);
canvas.drawRect(
rect,
new Paint()..shader = gradient.createShader(rect),
);
}
@override
SemanticsBuilderCallback get semanticsBuilder {
return (Size size) {
// Annotate a rectangle containing the picture of the sun
// with the label "Sun". When text to speech feature is enabled on the
// device, a user will be able to locate the sun on this picture by
// touch.
var rect = Offset.zero & size;
var width = size.shortestSide * 0.4;
rect = const Alignment(0.8, -0.9).inscribe(new Size(width, width), rect);
return [
new CustomPainterSemantics(
rect: rect,
properties: new SemanticsProperties(
label: 'Sun',
textDirection: TextDirection.ltr,
),
),
];
};
}
// Since this Sky painter has no fields, it always paints
// the same thing and semantics information is the same.
// Therefore we return false here. If we had fields (set
// from the constructor) then we would return true if any
// of them differed from the same fields on the oldDelegate.
@override
bool shouldRepaint(Sky oldDelegate) => false;
@override
bool shouldRebuildSemantics(Sky oldDelegate) => false;
}
See also
https://pub.dartlang.org/packages/flutter_svg (limited SVG support for Flutter)- https://github.com/flutter/flutter/tree/master/dev/tools/vitool
https://github.com/simolus3/fluttie (not sure this is working already)
answered Apr 17 '18 at 15:36
Günter ZöchbauerGünter Zöchbauer
332k701006941
add a comment |
3
3
3
You can create a widget that extends CustomPainter
class Sky extends CustomPainter {
@override
void paint(Canvas canvas, Size size) {
var rect = Offset.zero & size;
var gradient = new RadialGradient(
center: const Alignment(0.7, -0.6),
radius: 0.2,
colors: [const Color(0xFFFFFF00), const Color(0xFF0099FF)],
stops: [0.4, 1.0],
);
canvas.drawRect(
rect,
new Paint()..shader = gradient.createShader(rect),
);
}
@override
SemanticsBuilderCallback get semanticsBuilder {
return (Size size) {
// Annotate a rectangle containing the picture of the sun
// with the label "Sun". When text to speech feature is enabled on the
// device, a user will be able to locate the sun on this picture by
// touch.
var rect = Offset.zero & size;
var width = size.shortestSide * 0.4;
rect = const Alignment(0.8, -0.9).inscribe(new Size(width, width), rect);
return [
new CustomPainterSemantics(
rect: rect,
properties: new SemanticsProperties(
label: 'Sun',
textDirection: TextDirection.ltr,
),
),
];
};
}
// Since this Sky painter has no fields, it always paints
// the same thing and semantics information is the same.
// Therefore we return false here. If we had fields (set
// from the constructor) then we would return true if any
// of them differed from the same fields on the oldDelegate.
@override
bool shouldRepaint(Sky oldDelegate) => false;
@override
bool shouldRebuildSemantics(Sky oldDelegate) => false;
}
See also
https://pub.dartlang.org/packages/flutter_svg (limited SVG support for Flutter)- https://github.com/flutter/flutter/tree/master/dev/tools/vitool
https://github.com/simolus3/fluttie (not sure this is working already)
answered Apr 17 '18 at 15:36
Günter ZöchbauerGünter Zöchbauer
332k701006941
You can create a widget that extends CustomPainter
class Sky extends CustomPainter {
@override
void paint(Canvas canvas, Size size) {
var rect = Offset.zero & size;
var gradient = new RadialGradient(
center: const Alignment(0.7, -0.6),
radius: 0.2,
colors: [const Color(0xFFFFFF00), const Color(0xFF0099FF)],
stops: [0.4, 1.0],
);
canvas.drawRect(
rect,
new Paint()..shader = gradient.createShader(rect),
);
}
@override
SemanticsBuilderCallback get semanticsBuilder {
return (Size size) {
// Annotate a rectangle containing the picture of the sun
// with the label "Sun". When text to speech feature is enabled on the
// device, a user will be able to locate the sun on this picture by
// touch.
var rect = Offset.zero & size;
var width = size.shortestSide * 0.4;
rect = const Alignment(0.8, -0.9).inscribe(new Size(width, width), rect);
return [
new CustomPainterSemantics(
rect: rect,
properties: new SemanticsProperties(
label: 'Sun',
textDirection: TextDirection.ltr,
),
),
];
};
}
// Since this Sky painter has no fields, it always paints
// the same thing and semantics information is the same.
// Therefore we return false here. If we had fields (set
// from the constructor) then we would return true if any
// of them differed from the same fields on the oldDelegate.
@override
bool shouldRepaint(Sky oldDelegate) => false;
@override
bool shouldRebuildSemantics(Sky oldDelegate) => false;
}
See also
https://pub.dartlang.org/packages/flutter_svg (limited SVG support for Flutter)- https://github.com/flutter/flutter/tree/master/dev/tools/vitool
https://github.com/simolus3/fluttie (not sure this is working already)
answered Apr 17 '18 at 15:36
Günter ZöchbauerGünter Zöchbauer
332k701006941
edited Jan 3 at 10:12
answered Apr 17 '18 at 15:36
Günter ZöchbauerGünter Zöchbauer
332k701006941
answered Apr 17 '18 at 15:36
Günter ZöchbauerGünter Zöchbauer
332k701006941
answered Apr 17 '18 at 15:36
Günter ZöchbauerGünter Zöchbauer
332k701006941
332k701006941
add a comment |
add a comment |
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