namespace proj 
{
    public patrial class Form1 : Form
    {
        class Figure
        {
            public PointF p1;
            public PointF p2;
            
            public Figure(PointF p1, PointF p2)
            {
                this.p1 = p1;
                this.p2 = p2;
            }
        }
        
        private int mousestillclick = 0;
        public float max;
        
        public PointF p1;
        public PointF p2;
        
        private Figure[] figures = new Figure[1000];
        
        private int countFigures = 0;
        public string maxrest;
        private PointF[] points = new PointF[1000];
        public float maxr = 0;
        public float minr;
        private int k = 0;
        public float ras;
        public float sq11;
        public float sq22;
        private PointF start;
        public float mood;
        private PointF mousea;

        Pen pen;
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_MouseClick(object sender, MouseEventArgs e)
        {
            if (k < points.Length)
            {
                points[k] = new PointF(e.X, e.Y);
                k++;
            }
        }

        private void Form1_MouseDown(object sender, MouseEventArgs e)
        {
            start = new PointF(e.X, e.Y);
            mousestillclick = 1;
        }

        private void Form1_MouseMove(object sender, MouseEventArgs e)
        {
            mousea = new PointF(e.X, e.Y);

            if (mousestillclick == 1)
                Refresh();
        }

        private void Form1_MouseUp(object sender, MouseEventArgs e)
        {
            if (countFigures < figures.Length)
            {
                figures[countFigures] = new Figure(start, new PointF(e.X, e.Y));
                countFigures++;
                Refresh();
            }
            mousestillclick = 0;
        }

        private void Form1_Paint_1(object sender, PaintEventArgs e)
        {
            pen = new Pen(Color.Red);
            Font font = new Font("Times New Roman", 14);
            Brush brush = new SolidBrush(Color.Black);

            for (int n = 0; n < countFigures; n++)
                for (int i = n + 1; i < countFigures; i++)
                {
                    float sq1 = (figures[n].p2.X - figures[n].p1.X) * (figures[n].p2.X - figures[n].p1.X) + (figures[n].p2.Y - figures[n].p1.Y) * (figures[n].p2.Y - figures[n].p1.Y);
                    
                    sq11 = (float)Math.Sqrt(sq1);
                    
                    e.Graphics.DrawEllipse(pen, figures[n].p1.X - (float)Math.Sqrt(sq1), figures[n].p1.Y - (float)Math.Sqrt(sq1), 2 * (float)Math.Sqrt(sq1), 2 * (float)Math.Sqrt(sq1));

                    float sq2 = (figures[i].p2.X - figures[i].p1.X) * (figures[i].p2.X - figures[i].p1.X) + (figures[i].p2.Y - figures[i].p1.Y) * (figures[i].p2.Y - figures[i].p1.Y);
                    
                    sq22 = (float)Math.Sqrt(sq2);
                    
                    e.Graphics.DrawEllipse(pen, figures[i].p1.X - (float)Math.Sqrt(sq2), figures[i].p1.Y - (float)Math.Sqrt(sq2), 2 * (float)Math.Sqrt(sq2), 2 * (float)Math.Sqrt(sq2));

                    if (sq11 >= sq22)
                    {
                        maxr = sq11;
                    }
                    else
                    {
                        maxr = sq22;

                    }

                    float de = (figures[i].p1.X - figures[n].p1.X) * (figures[i].p1.X - figures[n].p1.X) + (figures[i].p1.Y - figures[n].p1.Y) * (figures[i].p1.Y - figures[n].p1.Y);
                    
                    float des = (float)Math.Sqrt(de);

                    if (des >= (sq11 + sq22))
                    {
                        max = 0;
                    }

                    if (des <= (Math.Abs(sq11 - sq22)))
                    {
                        max = 0;
                    }


                    if ((Math.Abs(sq11 - sq22)) < des && des < (sq11 + sq22))
                    {
                        max = 2 * (float)Math.Sqrt((4 * sq22 * sq22 * des * des) - (sq22 * sq22 - sq11 * sq11 + des * des) * (sq22 * sq22 - sq11 * sq11 + des * des)) / (2 * des);
                    }
                    if ((des < maxr) && des > (Math.Abs(sq11 - sq22)))
                    {
                    max = 2 * (float)Math.Sqrt((4 * sq22 * sq22 * des * des) - (sq22 * sq22 - sq11 * sq11 - des * des) * (sq22 * sq22 - sq11 * sq11 - des * des)) / (2 * des);
                    }

                    string maxrest = "Max = " + max;

                    e.Graphics.DrawString(maxrest, font, brush, 600, 70);
                }


            if (mood == 1)
            {

            }
            if (mousestillclick == 1)
            {
                float sq1 = (mousea.X - start.X) * (mousea.X - start.X) + (mousea.Y - start.Y) * (mousea.Y - start.Y);
                e.Graphics.DrawEllipse(pen, start.X - (float)Math.Sqrt(sq1), start.Y - (float)Math.Sqrt(sq1), 2 * (float)Math.Sqrt(sq1), 2 * (float)Math.Sqrt(sq1));
                float sq2 = (mousea.X - start.X) * (mousea.X - start.X) + (mousea.Y - start.Y) * (mousea.Y - start.Y);
                e.Graphics.DrawEllipse(pen, start.X - (float)Math.Sqrt(sq2), start.Y - (float)Math.Sqrt(sq2), 2 * (float)Math.Sqrt(sq2), 2 * (float)Math.Sqrt(sq2));
            }


        }

        private void removeToolStripMenuItem_Click(object sender, EventArgs e)
        {
            mood = 1;
        }       
    }
}