怎样才能画出这样的半圆呢?
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;
}
创建一个StatelessWidget
say MyArc
它接受一个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),
);
}
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