private void triangleButton_Click(object sender, EventArgs e)
{
int width;
int height;
int x;
int y;
Figure triangle;
while (true)
{
width = random.Next(50, 100);
height = random.Next(50, 100);
x = random.Next(1, pictureBox1.Width);
y = random.Next(1, pictureBox1.Height);
triangle = new Triangle(x, y, width, height);
if (triangle.IsInRegion(pictureBox1.Width, pictureBox1.Height))
break;
}
triangle.SetStep(random.Next(1, 5), random.Next(1, 5));
figureList.Add(triangle);
treeView1.Nodes.Add(triangle.GetType().Name.ToString() + " " + triangle.X + "; " + triangle.Y);
pictureBox1.Invalidate();
}