books

assets/draw/p06/s02.dart

@@ -0,0 +1,61 @@
+
+import 'package:flutter/material.dart';
+
+import '../components/coordinate.dart';
+
+/// create by 张风捷特烈 on 2020/5/1
+/// contact me by email 1981462002@qq.com
+/// 说明:
+
+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();
+
+  @override
+  void paint(Canvas canvas, Size size) {
+    coordinate.paint(canvas, size);
+    canvas.translate(size.width / 2, size.height / 2);
+
+    Path path = Path();
+    Paint paint = Paint()
+      ..color = Colors.purple
+      ..style = PaintingStyle.fill;
+
+    path
+      ..relativeMoveTo(0, 0)
+      ..relativeLineTo(-30, 120)
+      ..relativeLineTo(30, -30)
+      ..relativeLineTo(30, 30)
+      ..close();
+
+    canvas.drawPath(path, paint);
+
+    print(path.contains(Offset(20, 20)));
+    print(path.contains(Offset(0, 20)));
+
+    Rect bounds = path.getBounds();
+    canvas.drawRect(
+        bounds,
+        Paint()
+          ..color = Colors.orange
+          ..style = PaintingStyle.stroke
+          ..strokeWidth = 1);
+  }
+
+  @override
+  bool shouldRepaint(CustomPainter oldDelegate) => false;
+}