inner,
customPaint
…color = Colors.purpleAccent
);
Path path = new Path()…moveTo(0.0, 300.0);
path.lineTo(100.0, 330.0);
path.lineTo(250, 350);
canvas.drawPath(
path,
customPaint
…color = Colors.brown
);
}
@override
bool shouldRepaint(CustomPainter oldDelegate) {
return true;
}
}
2.解释源代码
import ‘dart:ui’;
import ‘package:flutter/material.dart’;
void main() => runApp(MyApp());
class MyApp extends StatefulWidget {
@override
_MyAppState createState() => _MyAppState();
}
class _MyAppState extends State {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
CustomPaint(
size: Size(300, 500),
painter: MyPainter(),
)
]
),
)
),
);
}
}
class MyPainter extends CustomPainter {
Paint customPaint = new Paint()
…color = Colors.orange
…strokeCap = StrokeCap.round
…isAntiAlias = true
…strokeWidth = 10.0
…style = PaintingStyle.stroke;
@override
void paint(Canvas canvas, Size size) {
//直线
canvas.drawLine(Offset(0.0, 0.0), Offset(200.0, 0.0), customPaint);
//点
canvas.drawPoints(
//PointMode.xxx
//points（点），lines（线，隔点连接），polygon（线，相邻连接）
PointMode.points,
[
Offset(20.0, 130.0),
Offset(100.0, 180.0),
],
customPaint…color = Colors.redAccent
);
//圆
canvas.drawCircle(
Offset(100.0, 50.0),
30.0,
customPaint
…color = Colors.blue
…style = PaintingStyle.stroke //绘画风格改为stroke
);
canvas.drawColor(Colors.red, BlendMode.color);
//椭圆
canvas.drawOval(
Rect.fromPoints(Offset(170.0, 100.0), Offset(270.0, 150.0)),
customPaint
…color = Colors.black
);
//弧
canvas.drawArc(
Rect.fromCircle(center: Offset(200.0, 5.0), radius: 80.0),
0.0, 1.5, false,
customPaint
…color = Colors.yellow
);
//扇形
canvas.drawArc(
Rect.fromCircle(center: Offset(200.0, 300.0), radius: 100.0),
3.0, 2, true,
customPaint
…color = Colors.yellow
);
//圆角
canvas.drawRRect(
RRect.fromRectAndRadius(
Rect.fromCircle(center: Offset(90.0, 150.0), radius: 50.0),
Radius.circular(30.0)
),
customPaint
…color = Colors.green
);
//双圆角矩形
//外部圆角
RRect outer = RRect.fromRectAndRadius(
Rect.fromCircle(center: Offset(100.0, 400.0), radius: 50.0),
Radius.circular(10.0)
);
//内部圆角
RRect inner = RRect.fromRectAndRadius(
Rect.fromCircle(center: Offset(100.0, 400.0), radius: 30.0),
Radius.circular(10.0)
);
canvas.drawDRRect(
outer,
inner,
customPaint
…color = Colors.purpleAccent
);
//路径
//起点(0.0, 300.0)
//连接(100.0, 330.0)、(250, 350)
Path path = new Path()…moveTo(0.0, 300.0);
path.lineTo(100.0, 330.0);
path.lineTo(250, 350);
canvas.drawPath(
path,
customPaint
…color = Colors.brown
);
}
@override
bool shouldRepaint(CustomPainter oldDelegate) {
// TODO: implement shouldRepaint
return true;
}
}
最后
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资料领取方式： Android架构设计
d-P7/blob/master/Android%E5%BC%80%E5%8F%91%E4%B8%8D%E4%BC%9A%E8%BF%99%E4%BA%9B%EF%BC%9F%E5%A6%82%E4%BD%95%E9%9D%A2%E8%AF%95%E6%8B%BF%E9%AB%98%E8%96%AA%EF%BC%81.md)
[外链图片转存中…(img-tqIgHvSi-1645008840850)]
[外链图片转存中…(img-2upCn8np-1645008840851)]
