import 'dart:math';

import 'package:flutter/material.dart';
import 'package:matrix4_transform/matrix4_transform.dart';



void main() {
  runApp(MaterialApp(
      home: Scaffold(
        body: Center(
          child: SizedBox(width: 300, height: 300,
           child: Container(
               color: Colors.blue,
               child: const TestWidget()
           )
          ) ,
        ),
      )
  ));
}
Matrix4 _rotate(double angle, Offset focalPoint) {
  var c = cos(angle);
  var s = sin(angle);
  var dx = (1 - c) * focalPoint.dx + s * focalPoint.dy;
  var dy = (1 - c) * focalPoint.dy - s * focalPoint.dx;

  //  ..[0]  = c       # x scale
  //  ..[1]  = s       # y skew
  //  ..[4]  = -s      # x skew
  //  ..[5]  = c       # y scale
  //  ..[10] = 1       # diagonal "one"
  //  ..[12] = dx      # x translation
  //  ..[13] = dy      # y translation
  //  ..[15] = 1       # diagonal "one"
  return Matrix4(c, s, 0, 0, -s, c, 0, 0, 0, 0, 1, 0, dx, dy, 0, 1);
}

class TestWidget extends StatelessWidget{
  const TestWidget({super.key});

  @override
  Widget build(BuildContext context) {
    var tran = Matrix4.identity();
    final size =MediaQuery.of(context).size;
    // tran.setTranslation(Matrix4.translationValues(100, 120, 0).getTranslation());
    tran =  Matrix4Transform()
        .rotateDegrees(45, origin: Offset(150, 150)).matrix4 * tran;
    // tran =  Matrix4Transform()
    //     .rotateDegrees(45, origin: Offset(150, 150)).matrix4 * tran;
    //

    return Transform(
              transform: tran,
              child: const Text('测试', style: TextStyle(fontSize: 50),),
    );
  }

}