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//See included source for full listing
 private void drawFractal()
        {
            const double MaxColor = 255.0;
            int nPens = (int)Math.Floor( MaxColor / frmOpt.gradientProg );
            Pen[] colorPens = new Pen[nPens];
 
            double deltaRed = 0.0;
            double deltaGreen = 0.0;
            double deltaBlue = 0.0;
 
            if (frmOpt.chgRed)
            {
                if (frmOpt.redEnd > frmOpt.red)
                {
                    deltaRed = (double)(frmOpt.redEnd - frmOpt.red) / nPens;
                }
                else
                {
                    deltaRed = (-1) * (double)(frmOpt.red - frmOpt.redEnd) / nPens;
                }
            }
            
            if (frmOpt.chgGreen)
            {
                if (frmOpt.greenEnd > frmOpt.green)
                {
                    deltaGreen = (double)(frmOpt.greenEnd - frmOpt.green) / nPens;
                }
                else
                {
                    deltaGreen= (-1) * (double)(frmOpt.green - frmOpt.greenEnd) / nPens;
                }
            }
            if (frmOpt.chgBlue)
            {
                if (frmOpt.blueEnd > frmOpt.blue)
                {
                    deltaBlue = (double)(frmOpt.blueEnd - frmOpt.blue) / nPens;
                }
                else
                {
                    deltaBlue = (-1) * (double)(frmOpt.blue - frmOpt.blueEnd) / nPens;
                }
            }
 
            for (int i = 0; i < nPens; i++)
            {
                colorPens[i] = new Pen(new SolidBrush(System.Drawing.Color.FromArgb(frmOpt.red + (int)(deltaRed*i),
                                                                                    frmOpt.green + (int)(deltaGreen*i),
                                                                                    frmOpt.blue + (int)(deltaBlue*i))));
            }
            bmp = null;
            if (frmOpt.isJulia)
            {
                drawJuliaFractal(colorPens);
            }
            else
            {
                drawMandelbrotFractal(colorPens);
            }
        }