books

2023-12-16 12:40:32 +08:00
parent ab2778a22b
commit 01fdf966c5
593 changed files with 8995 additions and 27753 deletions
--- a/assets/draw/p04/s07.dart
+++ b/assets/draw/p04/s07.dart
@@ -0,0 +1,125 @@
+import 'dart:ui' as ui;
+import 'package:flutter/material.dart';
+import '../components/coordinate.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 Container(
+      color: Colors.white,
+      child: CustomPaint(
+        // 使用CustomPaint
+        painter: PaperPainter(),
+      ),
+    );
+  }
+}
+
+class PaperPainter extends CustomPainter {
+  final Coordinate coordinate = Coordinate(step: 25);
+
+  late Paint _paint;
+
+  final double strokeWidth = 0.5;
+  final Color color = Colors.blue;
+
+  PaperPainter() {
+    _paint = Paint()
+      ..style = PaintingStyle.fill
+      ..strokeWidth = strokeWidth
+      ..color = color;
+  }
+
+  @override
+  void paint(Canvas canvas, Size size) {
+    coordinate.paint(canvas, size);
+    canvas.translate(size.width / 2, size.height / 2);
+
+    _drawTextLeft(canvas);
+    _drawTextTextAlignRight(canvas);
+    _drawTextPaint(canvas, "100", offset: Offset(0, 0));
+  }
+
+  void _drawTextLeft(Canvas canvas) {
+    var builder = ui.ParagraphBuilder(ui.ParagraphStyle(
+      textAlign: TextAlign.left,
+      fontSize: 40,
+      textDirection: TextDirection.ltr,
+      maxLines: 1,
+    ))
+      ..pushStyle(
+        ui.TextStyle(
+            color: Colors.black87, textBaseline: ui.TextBaseline.alphabetic),
+      )
+      ..addText("Flutter Unit");
+
+    canvas.drawParagraph(
+        builder.build()..layout(ui.ParagraphConstraints(width: 300)),
+        Offset(0, -100));
+    canvas.drawRect(Rect.fromLTRB(0, 0 - 100.0, 300, 40 - 100.0),
+        _paint..color = Colors.blue.withAlpha(33));
+  }
+
+  void _drawTextCenter(Canvas canvas,String str) {
+    var builder = ui.ParagraphBuilder(ui.ParagraphStyle(
+      textAlign: TextAlign.center,
+      fontSize: 12,
+      textDirection: TextDirection.ltr,
+      maxLines: 1,
+    ))
+      ..pushStyle(
+        ui.TextStyle(
+            color: Colors.black87, textBaseline: ui.TextBaseline.alphabetic),
+      )
+      ..addText(str);
+
+    canvas.drawParagraph(
+        builder.build()..layout(ui.ParagraphConstraints(width: 12.0*str.length)),
+        Offset(0, 0));
+
+  }
+
+  void _drawTextTextAlignRight(Canvas canvas) {
+    var builder = ui.ParagraphBuilder(ui.ParagraphStyle(
+      textAlign: TextAlign.right,
+      fontSize: 40,
+      textDirection: TextDirection.ltr,
+      maxLines: 1,
+    ))
+      ..pushStyle(
+        ui.TextStyle(
+            color: Colors.black87, textBaseline: ui.TextBaseline.alphabetic),
+      )
+      ..addText("Flutter Unit");
+
+    canvas.drawParagraph(
+        builder.build()..layout(ui.ParagraphConstraints(width: 300)),
+        Offset(0, 100));
+
+    canvas.drawRect(Rect.fromLTRB(0, 0 + 100.0, 300, 40 + 100.0),
+        _paint..color = Colors.blue.withAlpha(33));
+  }
+
+  void _drawTextPaint(Canvas canvas, String text,
+      {Offset offset = Offset.zero}) {
+    TextPainter(
+        text: TextSpan(
+            text: text, style: TextStyle(fontSize: 12, color: Colors.black)),
+        textAlign: TextAlign.left,
+        textDirection: TextDirection.ltr)
+      ..layout(maxWidth: 300)
+      ..paint(canvas, offset);
+
+    canvas.drawRect(Rect.fromLTRB(0, 0, 300, 40),
+        _paint..color = Colors.blue.withAlpha(33));
+  }
+
+  @override
+  bool shouldRepaint(PaperPainter oldDelegate) => false;
+}