books

assets/draw/p03/s09.dart

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+import 'dart:math';
+import 'dart:typed_data';
+import 'dart:ui' as ui;
+
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter/services.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();
+  final double strokeWidth = 0.5;
+  final Color color = Colors.blue;
+
+  @override
+  void paint(Canvas canvas, Size size) {
+    // coordinate.paint(canvas, size);
+    canvas.translate(size.width / 2, size.height / 2);
+
+    Paint paint = Paint()
+      ..style = PaintingStyle.fill
+      ..color = Colors.white
+      ..isAntiAlias = true;
+    double relativeX = 100;
+    double angle = 0;
+    double width = 10;
+    double height = 10;
+    double center =  relativeX + width / 2;
+    if(angle == 0) {
+      center = relativeX + width/4;
+    } else if (angle == 2) {
+      center = relativeX + width/4*3;
+    }
+
+    Path trianglePath = Path()
+      ..addPolygon([Offset(relativeX, height), Offset(relativeX + width, height), Offset(center, 0),], false)..close();
+
+    Path rectanglePath = Path()
+      ..addRRect(RRect.fromLTRBR(0, 10, 160, 100, Radius.circular(8)))..close();
+
+
+    canvas.drawShadow(Path.combine(PathOperation.xor, trianglePath, rectanglePath), Colors.black, 3, false);
+    canvas.drawPath(Path.combine(PathOperation.xor, trianglePath, rectanglePath), paint..color = Colors.white);
+    paint.maskFilter = MaskFilter.blur(BlurStyle.inner, 20);
+    canvas.drawPath(Path.combine(PathOperation.xor, trianglePath, rectanglePath), paint..color=Color(0xffBEC4C0));
+
+  }
+
+
+
+  @override
+  bool shouldRepaint(CustomPainter oldDelegate) => false;
+}