初步优化项目结构

lib/widget_system/widgets/SingleChildRenderObjectWidget/Transform/node5_perspective.dart

@@ -0,0 +1,79 @@
+import 'dart:math';
+
+import 'package:flutter/material.dart';
+
+/// create by 张风捷特烈 on 2020/4/30
+/// contact me by email 1981462002@qq.com
+/// 说明: 
+
+//    {
+//      "widgetId": 78,
+//      "name": '透视变换rotation',
+//      "priority": 5,
+//      "subtitle":
+//          "由R3C1、R3C2、R3C3控制透视",
+//    }
+class R3C2 extends StatefulWidget {
+  @override
+  _R3C2State createState() => _R3C2State();
+}
+
+class _R3C2State extends State<R3C2> {
+  late Matrix4 _m4;
+  double _value = 0;
+  double _rad = 0;
+
+  @override
+  Widget build(BuildContext context) {
+    _m4 = Matrix4.identity()
+//      ..setEntry(3, 0, _value) // x
+//      ..setEntry(3, 1, _value)//   y
+      ..setEntry(3, 2, _value) // z
+      ..rotateY(_rad)
+//      ..rotateX(_rad)
+        ;
+    return Column(
+      children: <Widget>[
+        Transform(
+          transform: _m4,
+          child: Container(
+              color: Colors.cyanAccent,
+              width: 100,
+              height: 100,
+              child: Image.asset(
+                'assets/images/wy_300x200.webp',
+                fit: BoxFit.cover,
+              )),
+        ),
+        _buildSliders()
+      ],
+    );
+  }
+
+  Widget _buildSliders() => Column(
+    children: <Widget>[
+      Slider(
+          min: -0.01,
+          max: 0.01,
+          value: _value,
+          divisions: 360,
+          label: 'x:${_value.toStringAsFixed(5)}',
+          onChanged: (v) {
+            setState(() {
+              _value = v;
+            });
+          }),
+      Slider(
+          min: -pi,
+          max: pi,
+          value: _rad,
+          divisions: 360,
+          label: '角度:' + (_rad * 180 / pi).toStringAsFixed(1) + "°",
+          onChanged: (v) {
+            setState(() {
+              _rad = v;
+            });
+          }),
+    ],
+  );
+}