69 lines
1.6 KiB
Dart
69 lines
1.6 KiB
Dart
import 'package:flutter/material.dart';
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class Paper extends StatelessWidget {
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const Paper({super.key});
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@override
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Widget build(BuildContext context) {
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return Container(
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color: Colors.white,
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child: CustomPaint(
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// 使用CustomPaint
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painter: PaperPainter(),
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),
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);
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}
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}
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class PaperPainter extends CustomPainter {
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@override
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void paint(Canvas canvas, Size size) {
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// drawIsAntiAliasColor(canvas);
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drawStyleStrokeWidth(canvas);
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}
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// 测试 isAntiAlias 和 color属性
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void drawIsAntiAliasColor(Canvas canvas) {
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Paint paint = Paint();
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canvas.drawCircle(
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Offset(180, 180),
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170,
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paint
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..color = Colors.blue
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..strokeWidth = 5);
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canvas.drawCircle(
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Offset(180 + 360.0, 180),
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170,
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paint
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..isAntiAlias = false
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..color = Colors.red);
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}
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// 测试 style 和 strokeWidth 属性
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void drawStyleStrokeWidth(Canvas canvas) {
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Paint paint = Paint()..color = Colors.red;
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canvas.drawCircle(
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Offset(180, 180),
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150,
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paint
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..style = PaintingStyle.stroke
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..strokeWidth = 50);
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canvas.drawCircle(
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Offset(180 + 360.0, 180),
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150,
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paint
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..strokeWidth = 50
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..style = PaintingStyle.fill);
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//测试线
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canvas.drawLine(
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Offset(0, 180 - 150.0),
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Offset(1600, 180 - 150.0),
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paint
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..strokeWidth = 1
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..color = Colors.blueAccent);
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}
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@override
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bool shouldRepaint(CustomPainter oldDelegate) => false;
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}
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