如何解决如何在颤动中填充 2 个圆圈之间的空间?
我的圈子画家:
CircleWavePainter(this.animationValue) {
//add some property to paint
wavePaint = Paint()
..color = Colors.black.withAlpha(100)
..style = PaintingStyle.stroke
..strokeWidth = 1
..isAntiAlias = true;
}
我的颜料画了 2 个圆圈,需要一些帮助来填充空间:
void paint(Canvas canvas,Size size) {
//circle 1
canvas.drawCircle(Offset(size.height / 2,size.width / 2),80 * (1.4 - animationValue / 2),wavePaint);
//circle 2
canvas.drawCircle(Offset(size.height / 2,80 * (1.8 - animationValue / 2),wavePaint);
}
解决方法
你可以使用 stack Widget 我在我的课程中没有接触到动画,但我可以给你一个提示
Stack(
alignment: AlignmentDirectional.bottomEnd,children: [
CircleAvatar(
radius: 30,backgroundImage: NetworkImage(
'https://thispersondoesnotexist.com/image',),//photo
CircleAvatar(
radius: 7,backgroundColor: Colors.white,// active or not
CircleAvatar(
radius: 6,backgroundColor: Colors.green,// active circle space
],)
,
使用“堆栈”小部件而不是“绘制”来实现您的设计。
import 'package:flutter/material.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',theme: ThemeData(
primarySwatch: Colors.blue,visualDensity: VisualDensity.adaptivePlatformDensity,home: MyHomePage(title: 'Flutter Demo Home Page'),);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key,this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
@override
void initState() {
super.initState();
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),body: _buildBody(),);
}
Widget _buildBody() {
return Container(
height: 400,width: 400,child: Stack(
alignment: AlignmentDirectional.center,children: [
Container(
width: 280,height: 280,decoration: BoxDecoration(
shape: BoxShape.circle,color: Color(0xFF4C4D4F),Container(
width: 200,height: 200,color: Colors.white,Container(
width: 140,height: 140,child: Icon(
Icons.access_alarm,size: 30,color: Color(0xFF5EA2EB),)
],);
}
}
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