Простой графический редактор (перевести с C# на C++)

namespace OpenSave_1_
 {
 public partial class Form1 : Form
 {
 public Form1()
 {
 InitializeComponent();
 pen_for_draw.StartCap = pen_for_draw.EndCap = System.Drawing.Drawing2D.LineCap.Round;
 }
 
private Bitmap bmp_for_draw;
private Point start_point;
private bool Draw;
private Pen pen_for_draw = new Pen(Color.Black, 4);
private string full_name_of_image;
 
private void button1_Click(object sender, EventArgs e)
 {
 OpenFileDialog open_dialog = new OpenFileDialog();
 open_dialog.Filter = "Image Files(*.BMP;*.JPG;*.GIF;*.PNG)|*.BMP;*.JPG;*.GIF;*.PNG|All files (*.*)|*.*";
 if (open_dialog.ShowDialog() == DialogResult.OK)
 {
 try
 {
 full_name_of_image = open_dialog.FileName;
 bmp_for_draw = new Bitmap(open_dialog.FileName);
 this.pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;
 pictureBox1.Image = bmp_for_draw;
 pictureBox1.Invalidate();
 }
 catch
 {
 DialogResult rezult = MessageBox.Show("Impossible to open selected file",
 "Warning", MessageBoxButtons.OK, MessageBoxIcon.Error);
 }
 }
 }
 
private void button2_Click(object sender, EventArgs e)
 {
 if (pictureBox1.Image != null)
 {
 string format = full_name_of_image.Substring(full_name_of_image.Length - 4, 4);
 
 SaveFileDialog savedialog = new SaveFileDialog();
 savedialog.Title = "Сохранить картинку как ...";
 savedialog.OverwritePrompt = true; 
 savedialog.CheckPathExists = true; 
 savedialog.Filter = "Image Files(*.BMP)|*.BMP|Image Files(*.JPG)|*.JPG|Image 
Files(*.GIF)|*.GIF|Image Files(*.PNG)|*.PNG|All files (*.*)|*.*";
 savedialog.ShowHelp = true;
 // If selected, save
 if (savedialog.ShowDialog() == DialogResult.OK)
 {
 try
 {
 bmp_for_draw.Save(savedialog.FileName, System.Drawing.Imaging.ImageFormat.Jpeg);
 }
 catch
 {
 MessageBox.Show("Impossible to save image", "FATAL ERROR",
 MessageBoxButtons.OK, MessageBoxIcon.Error);
 }
 }
 }
 }
 
private void button3_Click(object sender, EventArgs e)
 {
 Graphics Графика = pictureBox1.CreateGraphics(); Графика.Clear(SystemColors.Window);
 }
 
private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
 {
 if (e.Button == MouseButtons.Left)
 {
 using (Graphics graf = Graphics.FromImage(pictureBox1.Image))
 {
 graf.DrawLine(pen_for_draw, start_point, e.Location);
 start_point = e.Location;
 pictureBox1.Invalidate();
 }
 }
 }
 
private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
 {
 if (e.Button == MouseButtons.Left)
 {
 Draw = true;
 start_point = e.Location;
 }
 }
 
private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
 {
 if (e.Button == MouseButtons.Left)
 {
 Draw = false;
 }
 }
 
private void Form1_Load(object sender, EventArgs e)
 {
 this.Text = "Изменение картинки";
 button1.Text = "Обзор";
 button2.Text= "Сохранить";
 button3.Text = "Очистить";
 }
 
 }
 }