//the method adds a figure to the FigureList class, and draws the desired figure (Circle)
private void button5_Click(object sender, EventArgs e)
{
figlist.figarray.Add("Cir");
using (grx = Graphics.FromImage(bmp))
{
grx.DrawEllipse(Pens.Black, figlist.GetCircle(Convert.ToInt32(textBox20.Text), Convert.ToInt32(textBox19.Text), Convert.ToInt32(textBox18.Text), Convert.ToInt32(textBox17.Text)));
}
pictureBox1.Image = bmp;
}