How To Create Custom Triangle Shape In Flutter Android App

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class DrawTriangleShape extends CustomPainter {
  Paint painter;
  DrawTriangleShape() {
    painter = Paint()
      ..color = Colors.orange
      ..style = PaintingStyle.fill;
  }

  @override
  void paint(Canvas canvas, Size size) {
    var path = Path();
    path.moveTo(size.width/2, 0);
    path.lineTo(0, size.height);
    path.lineTo(size.height, size.width);
    path.close();
    canvas.drawPath(path, painter);
  }
  @override
  bool shouldRepaint(CustomPainter oldDelegate) {
    return false;
  }
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
        home: Scaffold(
            appBar: AppBar(
              backgroundColor: Colors.orange,
              title: Text('Custom Triangle Shape'),
            ),
            body: Center(
              child:  CustomPaint(
                  size: Size(180, 180),
                  painter: DrawTriangleShape()
              ),
            )
        )
    );
  }
}