private void toolStripButton1_Click(object sender, EventArgs e)
        {
            OpenFileDialog open = new OpenFileDialog();
            open.Filter = "文本|*.jpg";
            open.InitialDirectory = Directory.GetCurrentDirectory();
            open.RestoreDirectory = true;
            if (open.ShowDialog()==DialogResult.OK)
            {
                backpicture = open.FileName;
                curimage = Image.FromFile(backpicture);
            }
            if (curimage != null)
            {
                pbitmap = new Bitmap(curimage);
                pictureBox1.Image = pbitmap;
                getbitmaparr(pbitmap);
            }            
        }

Graphics recte = e.Graphics;//pictureBox1.CreateGraphics();                
                ivisible = newf.iwires;
                itemp = iarrbitmapindex * ivisible;
                ilocationy = (itemp / curimage.Width) * ivisible;   //得到Y坐标
                ilocationx = itemp % curimage.Width;                 //得到X坐标
                Pen rectpen = new Pen(Color.Green, 2);
                Rectangle rect = new Rectangle(ilocationx, ilocationy, ivisible, ivisible);                
                recte.DrawRectangle(rectpen, rect);
                rectpen.Dispose();
                this.Invalidate(true);