How to flip the the text inside a panel(DrawString & Draw Line)

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C#

C#4.0

graphics

C#5.0

I am using two panel box for drawing a ruler along the side(top & left) of a picture box. I am able to succeed in it. Now my requirement is to flip the direction of the ruler so as to line starts from the picture box and the text(numbers) on the top. How can i do this

private void panel2_Paint(object sender, PaintEventArgs e)//left Panel
    {
        Graphics g = e.Graphics;
        g.PageUnit = GraphicsUnit.Millimeter;
        int step = 1;
        int length = panelleft.Height / 3;
        int small = 5;
        int big = 10;
        int number = 10;
        int scale = 10;
        float stroke = 2.5f;
        for (int i = 0; i < length; i += step)
        {
            float d = 1;
            if (i % small == 0)
            {
                if (i % big == 0)
                {
                    d = 3;
                }
                else
                {
                    d = 2;
                }
            }
            g.DrawLine(this.pen, 0f, i,d * stroke, i);             
            if ((i % number) == 0)
            {
                string text = (i / scale).ToString();
                SizeF size = g.MeasureString(text, this.Font, length, this.format);
                g.DrawString(text, this.Font, Brushes.Black,d * stroke, i - size.Width-1 / 2 , this.format);                  
            }
        }
    }

 private void panel3_Paint(object sender, PaintEventArgs e)// top panel
    {
        Graphics g = e.Graphics;
        g.PageUnit = GraphicsUnit.Millimeter;
        int step = 1;//incremnent
        int length = paneltop.Width / 3; //panelinte  widthinte pakuthi mathi bcs namml oru point gap vittanu line varakunnath     
        int small = 5;//cheriya vark ulla length
        int big = 10;//valiya vark ulla length
        int number = 10;//units 1cm=10 units           
        float stroke = 2.5f;

        for (int i = 0; i < length; i += step)
        {
            float d = 1;
            if (i % small == 0)//cheriya line 
            {
                if (i % big == 0)//valiya line
                {
                    d = 3; //varyude length
                }
                else
                {
                    d = 2;//varyude length
                }
            }
            g.DrawLine(this.pen, i, 0f, i, d * stroke);//lines varakunnu
            if ((i % number) == 0)//0,1,,2
            {
                string text = (i / number).ToString();//1,2,3 ennu ezhuthan
                SizeF size = g.MeasureString(text, this.Font, length, this.format);//ezhuthuna stringnte length ariyan// one digit length 1.618635,2 digit length3.23727
                g.DrawString(text, this.Font, Brushes.Black, i - size.Width / 2, d * stroke, this.format);//Y constant ayirikum (d* stroke) ennu koduthath line kazhinju string varan anu alenkil overlapp cheyum 
                //                                            (        X       )  (     Y   )
            }
        }

    }

and more help when user moves mouse over the image a horizontal and vertical line should be visible and it must be pointed to the ruler. Screen shot of the form can be visible on this link
http://i.stack.imgur.com/2WLgD.png[^]
Thanks in advance