private void pictureBoxPicture_MouseMove(object sender, MouseEventArgs e)
{
if (!moving)
{
return;
}
int difX = pictureBoxPicture.PointToClient(Cursor.Position).X - startingPosition.X;
int difY = pictureBoxPicture.PointToClient(Cursor.Position).Y - startingPosition.Y;
brush.Move(difX, difY);
startingPosition = new Point(e.X, e.Y);
pictureBoxPicture.Refresh();
}
