$tt[1] = $_GET[trendtype1];
$tt[2] = $_GET[trendtype2];
$tt[3] = $_GET[trendtype3];

//* Create and populate the pData object */
$MyData = new pData(); 
$noOfCharts = 0;
for ($x=1; $x <= 3; $x++) {
    if ($tt[$x] != '') {
       $y = $x - 1;
       //var_dump($ttvalues[$x])."<br>";
           $MyData->addPoints($ttvalues[$x],$tt[$x]);
       $MyData->setAxisName($y,$tt[$x]);
        $MyData->setSerieOnAxis($tt[$x],$y);
       $noOfCharts++;
      
    }
}
$MyData->setAxisPosition(2,AXIS_POSITION_RIGHT);
/* Bind a data serie to the X axis */
$MyData->addPoints($dataDatesArr,"Dates");
$MyData->setSerieDescription("Dates","Dates");
$MyData->setAbscissa("Dates");
$MyData->setAbscissaName("Dates");


/* Create the pChart object */
$myPicture = new pImage(700,530,$MyData);

/* Turn of Antialiasing */
$myPicture->Antialias = FALSE;

/* Add a border to the picture */
$myPicture->drawRectangle(0,0,699,400,array("R"=>0,"G"=>0,"B"=>0));

/* Write the chart title */
$myPicture->setFontProperties(array("FontName"=>$INC_DIR."/fonts/Forgotte.ttf","FontSize"=>11));
$myPicture->drawText(30,35,"Trend Report",array("FontSize"=>20,"Align"=>TEXT_ALIGN_BOTTOMLEFT));

/* Set the default font */
$myPicture->setFontProperties(array("FontName"=>$INC_DIR."/fonts/pf_arma_five.ttf","FontSize"=>6));

/* Define the chart area */
$myPicture->setGraphArea(90,90,600,300);

/* Draw the scale */
$ScaleSettings = array("DrawSubTicks"=>FALSE, "Mode"=>SCALE_MODE_ADDALL_START0, "Factors"=>array(1));
$myPicture->drawScale($ScaleSettings);

/* Turn on Antialiasing */
$myPicture->Antialias = TRUE;

/* Write the chart legend */
$myPicture->drawLegend(100,45,array("Style"=>LEGEND_NOBORDER,"Mode"=>LEGEND_HORIZONTAL));

/* Draw the line chart */
$myPicture->setFontProperties(array("FontName"=>$INC_DIR."/fonts/pf_arma_five.ttf","FontSize"=>10));
for ($x=1; $x <= $noOfCharts; $x++) {
   switch ($x) {
      case 1:
         $MyData->setSerieDrawable($tt[1],TRUE);
         $MyData->setSerieDrawable($tt[2],FALSE);
         $MyData->setSerieDrawable($tt[3],FALSE);
         break;
      case 2:
         $MyData->setSerieDrawable($tt[2],TRUE);
         $MyData->setSerieDrawable($tt[1],FALSE);
         $MyData->setSerieDrawable($tt[3],FALSE);
         break;
      case 3:
         $MyData->setSerieDrawable($tt[3],TRUE);
         $MyData->setSerieDrawable($tt[2],FALSE);
         $MyData->setSerieDrawable($tt[1],FALSE);
         break;
      default:
         break;
   }
   if ($tt[$x] == "Grade") {
      $myPicture->drawPlotChart(array("DisplayValues"=>TRUE,"DisplayColor"=>DISPLAY_AUTO));
   } else {
      $myPicture->drawLineChart(array("DisplayValues"=>TRUE,"DisplayColor"=>DISPLAY_AUTO));
   }
}

/* Render the picture (choose the best way) */
$myPicture->autoOutput("chart.png");
?>