Flutter how to draw semicircle (half circle) - flutter

Question

How can I draw semicircle like this?
Code:
class DrawHalfCircleClipper extends CustomClipper<Path> {
#override
Path getClip(Size size) {
final Path path = new Path();
...
return path;
}
#override
bool shouldReclip(CustomClipper<Path> oldClipper) {
return true;
}

Answer 1

Create a StatelessWidget say MyArc which accepts a diameter.
import 'dart:math' as math;
class MyArc extends StatelessWidget {
final double diameter;
const MyArc({super.key, this.diameter = 200});
#override
Widget build(BuildContext context) {
return CustomPaint(
painter: MyPainter(),
size: Size(diameter, diameter),
);
}
}
// This is the Painter class
class MyPainter extends CustomPainter {
#override
void paint(Canvas canvas, Size size) {
Paint paint = Paint()..color = Colors.blue;
canvas.drawArc(
Rect.fromCenter(
center: Offset(size.height / 2, size.width / 2),
height: size.height,
width: size.width,
),
math.pi,
math.pi,
false,
paint,
);
}
#override
bool shouldRepaint(CustomPainter oldDelegate) => false;
}
Usage:
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(),
body: MyArc(diameter: 300),
);
}

Answer 2

Container(
decoration: const BoxDecoration(
color: Colors.black,
borderRadius: BorderRadius.only(
bottomLeft: Radius.circular(100),
bottomRight: Radius.circular(100),
),
With this code you can make a half circle.

Answer 3

create a class that extends from CustomClipper and use the arcToPoint method to draw the circle and use the ClipPath widget, here is the code to implement that
ClipPath(
clipper: CustomClip(),
child: Container(
width: 200,
height: 100,
color: Colors.blue,
),
),
class CustomClip extends CustomClipper<Path> {
#override
Path getClip(Size size) {
double radius = 100;
Path path = Path();
path
..moveTo(size.width / 2, 0)
..arcToPoint(Offset(size.width, size.height),
radius: Radius.circular(radius))
..lineTo(0, size.height)
..arcToPoint(
Offset(size.width / 2, 0),
radius: Radius.circular(radius),
)
..close();
return path;
}
#override
bool shouldReclip(covariant CustomClipper<Path> oldClipper) {
return true;
}
}

Answer 4

with a simple implementation( not the best)
you can draw 2 container both have same width and height inside a row
and provide a BoxDectoration for each container => BorderRadius
as the following code,
this is not the best implementation , it just works
Row(children: [
Container(
decoration: BoxDecoration(
borderRadius: BorderRadius.only(topRight: Radius.circular(200),),
color: Colors.blue[300],
),
width: 200,
height: 200,
),
Container(
decoration: BoxDecoration(
borderRadius: BorderRadius.only(topLeft: Radius.circular(200),),
color: Colors.blue[300],
),
width: 200,
height: 200,
)
],
),

Answer 5

UPDATE: You only need a Container, EASY PEASY:
Container(
decoration: BoxDecoration(
borderRadius: BorderRadius.only(
bottomLeft: Radius.circular(100),
topLeft: Radius.circular(100)),
color: Colors.red,
shape: BoxShape.rectangle,
),
height: 35,
width: 35,
),
Here is a simple code using Stack. You can easily generate a semicircle using a rectangle and a circle. Reshape the containers with BoxDecoration(shape:)
Stack(
children: [
Align(
alignment: Alignment.center,
child: Container(
height: 35,
width: 35,
decoration: BoxDecoration(
color: Colors.red,
shape: BoxShape.circle,
),
),
),
Align(
alignment: Alignment.centerLeft,
child: Container(
decoration: BoxDecoration(
color: Colors.red,
shape: BoxShape.rectangle,
),
height: 35,
width: 35,
),
),
],
),

Answer 6

This will work, you can change the dimensions, but make sure the height is half the borderRadius and the width is equal to the borderRadius.
Container(
height: 50,
width:100,
decoration: const BoxDecoration(
color: Colors.black,
borderRadius: BorderRadius.only(
bottomLeft: Radius.circular(100),
bottomRight: Radius.circular(100),
))),