povray graph

#declare graphHeight    = 50;
#declare graphWidth     = 50;
#declare incrementX     = -graphWidth  / 2;
#declare incrementY     = -graphHeight / 2;
#declare gridWidth      = 0.07;
#declare axesWidth      = 0.5;
#declare gridSpacing    = 2;
#declare tickMarkLength = 1.5;

#declare graphXPos      = incrementX;
#declare graphYPos      = incrementY;

camera
{
    location <0, 0, -graphHeight>
    look_at <0, 0, 0>
}

light_source
{
    <0, 0, -graphHeight>
    color rgb <1, 1, 1>
}

#while (incrementY < graphHeight / 2)

    #while (incrementX < graphWidth / 2)

        box
        {
            <(incrementX) - (gridWidth / 2), -tickMarkLength / 2, 0>
            <(incrementX) + (gridWidth / 2), tickMarkLength / 2, 1>

            pigment
            {
                color rgb <1, 1, 1>
            }
        }

        #declare incrementX = incrementX + 1;

    #end

    box
    {
        <-tickMarkLength / 2, incrementY - (gridWidth / 2), 0>
        <tickMarkLength / 2, incrementY + (gridWidth / 2) , 1>

        pigment
        {
            color rgb <1, 1, 1>
        }
    }

    #declare incrementY = incrementY + 1;

#end

box
{
    <-axesWidth / 2, -(graphHeight / 2), 0>
    <axesWidth / 2, graphHeight / 2, 0>

    pigment
    {
        color rgb <1, 0, 0>
    }
}

box
{
    <-(graphWidth / 2), -axesWidth / 2  , 0>
    <(graphWidth / 2), axesWidth / 2, 1>

    pigment
    {
        color rgb <1, 0, 0>
    }
}

#declare varx     = 5;
#declare vary     = 0;
#declare varslope = 0;

#while (



#end