books

assets/draw/p02/s07.dart

@@ -0,0 +1,54 @@
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter/services.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(
+      painter: PaperPainter(),
+    );
+  }
+}
+
+class PaperPainter extends CustomPainter {
+
+  @override
+  void paint(Canvas canvas, Size size) {
+    drawBlendMode(canvas,BlendMode.lighten);
+    canvas.translate(150, 0);
+    drawBlendMode(canvas,BlendMode.hue);
+    canvas.translate(150, 0);
+    drawBlendMode(canvas,BlendMode.plus);
+    canvas.translate(150, 0);
+    drawBlendMode(canvas,BlendMode.hardLight);
+
+  }
+  void drawBlendMode(Canvas canvas,BlendMode mode) {
+    var paint = Paint();
+    canvas.drawCircle(Offset(100, 100), 50, paint..color = Color(0x88ff0000));
+
+    canvas.drawCircle(
+        Offset(140, 70),
+        50,
+        paint
+          ..color = Color(0x8800ff00)
+          ..blendMode = mode);
+
+    canvas.drawCircle(
+        Offset(140, 130),
+        50,
+        paint
+          ..color = Color(0x880000ff)
+          ..blendMode = mode);
+  }
+
+  @override
+  bool shouldRepaint(CustomPainter oldDelegate) => true;
+}