books

assets/draw/p02/s01.dart

@@ -0,0 +1,68 @@
+import 'package:flutter/material.dart';
+
+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 {
+  @override
+  void paint(Canvas canvas, Size size) {
+    // drawIsAntiAliasColor(canvas);
+    drawStyleStrokeWidth(canvas);
+  }
+
+  // 测试 isAntiAlias 和 color属性
+  void drawIsAntiAliasColor(Canvas canvas) {
+    Paint paint = Paint();
+    canvas.drawCircle(
+        Offset(180, 180),
+        170,
+        paint
+          ..color = Colors.blue
+          ..strokeWidth = 5);
+    canvas.drawCircle(
+        Offset(180 + 360.0, 180),
+        170,
+        paint
+          ..isAntiAlias = false
+          ..color = Colors.red);
+  }
+
+  // 测试 style 和 strokeWidth 属性
+  void drawStyleStrokeWidth(Canvas canvas) {
+    Paint paint = Paint()..color = Colors.red;
+    canvas.drawCircle(
+        Offset(180, 180),
+        150,
+        paint
+          ..style = PaintingStyle.stroke
+          ..strokeWidth = 50);
+    canvas.drawCircle(
+        Offset(180 + 360.0, 180),
+        150,
+        paint
+          ..strokeWidth = 50
+          ..style = PaintingStyle.fill);
+    //测试线
+    canvas.drawLine(
+        Offset(0, 180 - 150.0),
+        Offset(1600, 180 - 150.0),
+        paint
+          ..strokeWidth = 1
+          ..color = Colors.blueAccent);
+  }
+
+  @override
+  bool shouldRepaint(CustomPainter oldDelegate) => false;
+}