books

assets/draw/p09/p09.dart

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+export 'p09_page.dart';

assets/draw/p09/p09_page.dart

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+import 'package:flutter/material.dart';
+
+import 'package:idraw/components/demo_shower.dart';
+import 's01.dart' as s1;
+import 's02.dart' as s2;
+import 's03.dart' as s3;
+
+class P09Page extends StatelessWidget {
+  const P09Page({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return const DemoShower(
+      srcCodeDir: 'draw/p09',
+
+      demos:  [
+        s1.Paper(),
+        s2.Paper(),
+        s3.Paper(),
+      ],
+    );
+  }
+}

assets/draw/p09/s01.dart

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+
+import 'package:flutter/material.dart';
+
+
+
+
+/// create by 张风捷特烈 on 2020-03-19
+/// contact me by email 1981462002@qq.com
+/// 说明: 纸
+
+class Paper extends StatelessWidget {
+  const Paper({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Row(
+      children: [
+        Expanded(
+          child: CustomPaint(
+            // painter: BgPainter(), // 背景
+            foregroundPainter: BgPainter(Colors.blue.withOpacity(0.9)), // 前景
+            child:
+            Text(
+              "张风捷特烈",
+              style: TextStyle(color: Colors.black, fontSize: 20),
+            ),
+          ),
+        ),
+        Expanded(
+          child: CustomPaint(
+            painter: BgPainter(Colors.red), // 背景
+            // foregroundPainter: BgPainter(), // 前景
+            child:
+            Text(
+              "张风捷特烈",
+              style: TextStyle(color: Colors.white, fontSize: 20),
+            ),
+          ),
+        ),
+      ],
+    );
+  }
+}
+
+class BgPainter extends CustomPainter {
+  final Color color;
+
+  BgPainter(this.color);
+
+  @override
+  void paint(Canvas canvas, Size size) {
+    canvas.clipRect(Offset.zero&size);
+    canvas.drawPaint(Paint()..color = color);
+  }
+
+  @override
+  bool shouldRepaint(covariant CustomPainter oldDelegate) {
+    return false;
+  }
+}

assets/draw/p09/s02.dart

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+import 'dart:ui';
+import 'package:flutter/material.dart';
+
+import '../components/coordinate_pro.dart';
+/// create by 张风捷特烈 on 2020-03-19
+/// contact me by email 1981462002@qq.com
+/// 说明: 纸
+
+class Paper extends StatelessWidget {
+  const Paper({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Center(child: _buildChild());
+  }
+
+  Widget _buildChild() {
+    final Widget just = CustomPaint(
+      painter: BgPainter(), // 背景
+    );
+
+    final Widget withSize = CustomPaint(
+      size: Size(100,100),
+      painter: BgPainter(), // 背景
+    );
+
+
+    final Widget withLayoutBuilder = LayoutBuilder(
+      builder: _builderByLayout,
+    );
+
+
+    final Widget withChild = CustomPaint(
+      painter: BgPainter(),
+      child: Container(
+        width: 100,
+        height: 100,
+      ), // 背景
+    );
+
+    return withChild;
+  }
+
+  Widget _builderByLayout(BuildContext context, BoxConstraints constraints) {
+    return CustomPaint(
+      size: Size(constraints.maxWidth, constraints.maxHeight),
+      painter: BgPainter(), // 背景
+    );
+  }
+}
+
+class BgPainter extends CustomPainter {
+  @override
+  void paint(Canvas canvas, Size size) {
+    canvas.clipRect(Offset.zero&size);
+
+    canvas.drawRect(
+        Rect.fromPoints(Offset.zero, Offset(size.width, size.height)),
+        Paint()..color = Colors.red);
+  }
+
+  @override
+  bool shouldRepaint(covariant CustomPainter oldDelegate) => false;
+}
+

assets/draw/p09/s03.dart

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+import 'dart:async';
+import 'dart:math';
+import 'dart:ui' as ui;
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+
+import '../components/coordinate_pro.dart';
+
+/// create by 张风捷特烈 on 2020-03-19
+/// contact me by email 1981462002@qq.com
+/// 说明: 纸
+
+class Paper extends StatelessWidget{
+  const Paper({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return CustomPaint(
+      size: Size(100,100),
+      painter: PicMan(), // 背景
+    );
+  }
+
+}
+
+class PicMan extends CustomPainter {
+  @override
+  void paint(Canvas canvas, Size size) {
+    canvas.clipRect(Offset.zero & size); //剪切画布
+    canvas.translate(size.width/2, size.height/2);
+    _drawArcDetail(canvas);
+  }
+
+  void _drawArcDetail(Canvas canvas) {
+    var rect = Rect.fromCenter(center: Offset(0, 0), height: 100, width: 100);
+    Paint _paint = Paint();
+
+
+    var a = pi / 8;
+    canvas.drawArc(rect, a, 2 * pi - a.abs() * 2, true, _paint..color=Colors.yellowAccent);
+    canvas.translate(40, 0);
+
+    canvas.translate(40, 0);
+    canvas.drawCircle(Offset(0, 0), 6, _paint);
+    canvas.translate(25, 0);
+    canvas.drawCircle(Offset(0, 0), 6, _paint);
+
+  }
+
+  @override
+  bool shouldRepaint(covariant CustomPainter oldDelegate) => false;
+}