$my_graph->set_title_font(gdGiantFont);
$my_graph->set_y_label_font(gdMediumBoldFont);
$my_graph->set_x_label_font(gdMediumBoldFont);
$my_graph->set_y_axis_font(gdMediumBoldFont);
$my_graph->set_x_axis_font(gdMediumBoldFont);
$my_graph->set_values_font(gdMediumBoldFont);
$my_graph->set_legend_font(gdMediumBoldFont);