填充问题！！急！！！！

Question

我是根据输入个个数来画矩阵的，比如，输入4
就画出一个指定大小的4*4的矩阵来
然后我用的是FILLRETANGLE来话填充矩阵来填充它！

Answer 1

            
            string str = textBox1.Text;
            n = int.Parse(str);
            Graphics g = pictureBox1.CreateGraphics();
            //Image myimage = new Bitmap(600, 800);
            pictureBox1.Image = myimage;
            g = Graphics.FromImage(myimage);
       
            Pen BluePen = new Pen(Color.Blue);
            float x =80.00F;
            float y = 50.00F;
            float d = 300.00F/n;            for (int i = 0; i <=n;i++ )
            {
                PointF X1 = new PointF(x + i*d, y);
                PointF X2 = new PointF(x + i*d, y + 300.00F);
                g.DrawLine(BluePen, X1, X2);            }
            x = 80.00F;
            for (int j = 0; j <=n;j++ )
            {
                PointF Y1 = new PointF(x, y + j*d);
                PointF Y2 = new PointF(x + 300.00F, y + j*d);
                g.DrawLine(BluePen, Y1, Y2);            }
            //重新初始化
            x = 80.00F;
            y = 50.00F;
//填充
Graphics g = pictureBox1.CreateGraphics();
            Image myimage = new Bitmap(600, 800);
            pictureBox1.Image = myimage;
            g = Graphics.FromImage(myimage);            Pen BluePen = new Pen(Color.Blue);
            SolidBrush MyBrush=new SolidBrush(Color.Red);
      
            float x =80.00F;
            float y = 50.00F;
            float d = 300.00F/n;
            if(e.X>x&&e.X<x+d&&e.Y<y+d&&e.Y>y)
           {
               g.FillRectangle(MyBrush,x,y,d,d);
           }