Principal.cs

using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;

namespace R807DuplicarBufer
{
    public partial class Principal : Form
    {
        private bool aumentandoTamahnio = false;

        private int tamahnioImagen = 0;

        private Image imagen;

        public Principal()
        {
            InitializeComponent();
        }

        private void tmrActualizacion_Tick(object sender, EventArgs e)
        {
            if (aumentandoTamahnio)
            {
                --tamahnioImagen;
            }
            else
            {
                ++tamahnioImagen;
            }

            if (tamahnioImagen > (Width - 150))
            {
                aumentandoTamahnio = true;
            }
            else if (tamahnioImagen < 1)
            {
                aumentandoTamahnio = false;
            }

            Invalidate();
        }

        private void Principal_Load(object sender, EventArgs e)
        {
            imagen = Image.FromFile(@"Resources\ball_8.png");

            tmrActualizacion.Start();
        }

        private void Principal_Paint(object sender, PaintEventArgs e)
        {
            Graphics g;

            g = e.Graphics;

            g.SmoothingMode = SmoothingMode.HighQuality;

            g.FillRectangle(Brushes.DarkCyan, new Rectangle(new Point(0, 0), ClientSize));

            g.DrawImage(imagen, 50, 50, 50 + tamahnioImagen, 50 + tamahnioImagen);
        }

        private void chkUsarDobleBufer_CheckedChanged(object sender, EventArgs e)
        {
            DoubleBuffered = chkUsarDobleBufer.Checked;
        }
    }
}