Графика в с#

[.kbz]

Помогите сделать квадрат крутящимся???

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace lab_6
{
    public partial class Form1 : Form
    {
        Color line = Color.Blue;
        Color fill = Color.Gold;
        Color animal = Color.Gray;
        Bitmap A = null;
        Graphics g;
        bool open = false;

        public Form1()
        {
            InitializeComponent();
            g = panel1.CreateGraphics();
           
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (colorDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK) // цвет выбран?
            {
                int R, G, B;
                line = colorDialog1.Color;   // цвет RGB
                R = line.R;
                G = line.G;
                B = line.B;
            }
            panel1.Invalidate();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            if (colorDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK) // цвет выбран?
            {
                int R, G, B;
                fill = colorDialog1.Color;   // цвет RGB
                R = fill.R;
                G = fill.G;
                B = fill.B;
            }
            panel1.Invalidate();
        }

        private void button3_Click(object sender, EventArgs e)
        {
            if (colorDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK) // цвет выбран?
            {
                int R, G, B;
                animal = colorDialog1.Color;   // цвет RGB
                R = animal.R;
                G = animal.G;
                B = animal.B;
            }
            panel1.Invalidate();
        }

        private void button4_Click(object sender, EventArgs e)
        {
            if (timer1.Enabled == false) timer1.Start();
            else timer1.Stop();

            
        }

        private void button5_Click(object sender, EventArgs e)
        {
            openFileDialog1.ShowDialog();
            String path = openFileDialog1.FileName;
            A = new Bitmap(path);
            panel1.BackgroundImage = A;
            panel1.Invalidate();
        }

        private void panel1_Paint(object sender, PaintEventArgs e)
        {
            int x = panel1.Width / 2;
            int y = panel1.Height / 2;
            Pen pen1 = new Pen(line, 3);
            Brush brush1 = new SolidBrush(fill);
            Brush brush2 = new SolidBrush(fill);
            Brush brush3 = new SolidBrush(animal);
            g.DrawPolygon(pen1, new Point[]{
            new Point(x-30,y-60),new Point(x-30,y+50),new Point(x+30,y+50),new Point(x+30,y-60)});//прямоугольник
            g.DrawPolygon(pen1, new Point[]{
            new Point(x-40,y+50),new Point(x-40,y+60),new Point(x+40,y+60),new Point(x+40,y+50)});//низ
            g.FillEllipse(brush1, x - 10, y - 40, 20, 20);//1
            g.DrawRectangle(pen1, x - 10, y - 100, 20, 20);
            g.FillPolygon(brush1, new Point[]{
            new Point(x-40,y-60),new Point(x,y-80),new Point(x+40,y-60)});
            if (!open) g.FillEllipse(brush1, x - 10, y - 40, 20, 20);
            else
            {
                g.FillEllipse(brush2, x - 10, y - 10, 20, 20);
            }
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            if (open) open = false;
            else open = true;
            panel1.Invalidate();
           

        }       
    }
}