$LabelPositions = array(0,1,2);
$LabelCaptions = array('a','b','c');
$LabelSettings = array("Decimals"=>1,"ForceLabels"=>$LabelCaptions,"NoTitle"=>TRUE);
$myScatter->writeScatterLabel(0,$LabelPositions,$LabelSettings);

<?php   

$log = 0;

= mysql_pconnect($dbhost, $dbuser, $dbpass);
if( !$dbh ) { print("Failed"); }
mysql_select_db($dbbase,$dbh);

/* pChart library inclusions */
include("class/pData.class.php");
include("class/pDraw.class.php");
include("class/pImage.class.php");
include("class/pScatter.class.php");

/* Create the pData object */
$MyData = new pData(); 

// Data
$today = date('Y-m-d 23:59:59');

$days = $_GET['days'];
$departmentid = $_GET['dept'];
$max = $_GET['max'];
$label = $_GET['label'];

if ($departmentid == 0) {
   $department_clause = '';
} else {
   $department_clause = "and departmentid = $departmentid";
}

$end = strtotime($today);
$start = strtotime("-$days days", $end );

$ticket_sql = "
select
   ticketid,
   dateline
from `swtickets`
where laststaffreplytime > 0
".
$department_clause
."
and dateline
between $start
and $end
order by dateline desc
";

if ($log==1) {
  print "Max is ".$max."<br />";
   print "<h1>Ticket SQL</h1><code>".$ticket_sql."</code><br />";   
}

$pointer = mysql_query($ticket_sql);

while ($row = mysql_fetch_row($pointer)) {
   $ticketid = $row[0];
   $ticketdate = $row[1];
   
   if ($log==1) {
      print "<h3>Processing ticket $ticketid</h3>";
   }

   
   $first_sql = "
   select
      dateline,
      staffid
   from `swticketposts`
   where ticketid = $ticketid
   order by dateline asc
   limit 0,1
   ";
   
   if ($log==1) {
      print "<h6>Client SQL</h6>".$first_sql."<br />";
   }
   
   $first_pointer = mysql_query($first_sql);
   $first_row = mysql_fetch_row($first_pointer);
   $first_post = $first_row[0];

   $is_staff = $first_row[1];
   
   // if staffid != 0, then the first ticket was made by staff.
   // The real staff response needs to use limit 1,1
   
   // if staffid == 0, then the first ticket is non-staff
   // The staff response needs to use limit 0,1
   
   if ($is_staff != 0) {
      $limit_clause = "limit 1,1";
   } else {
      $limit_clause = "limit 0,1";
   }
   
   $staff_sql = "
   select
      dateline
   from `swticketposts`
   where ticketid = $ticketid
   and staffid != 0
   order by dateline asc
   ".$limit_clause;
   
   if ($log==1) {
      print "<h6>Staff SQL</h6>".$staff_sql."<br />";
   }
   
   $staff_pointer = mysql_query($staff_sql);
   $staff_row = mysql_fetch_row($staff_pointer);
   $staff_post = $staff_row[0];

   $response = $staff_post - $first_post;
   $response = $response / 3600;
   
   if ($log==1) {
      print "<h6>Results</h6>";
      print "Date: ".$ticketdate."<br />";
      print "Response: ".$response."<br />";
   }

   $MyData -> addPoints($response,'responsetime');
   $MyData -> addPoints($ticketdate,'dateline');
}

//$xmin = $MyData->getMin("dateline");
//$xmax = $MyData->getMax("dateline");
$xmin = $start;
$xmax = $end;
$ymax = 24; // initial value
if (isset($max)) {
   $ymax = $max;
} else {
   $ymax = $MyData->getMax("responsetime");
}

// X
$MyData->setSerieOnAxis("dateline",0);
$MyData->setAbscissa("dateline");
$MyData->setAxisPosition(0,AXIS_POSITION_BOTTOM);
$MyData->setAxisXY(0,AXIS_X);
$MyData->setAxisDisplay(0,AXIS_FORMAT_DATE,"M d");

// Y
$MyData->setSerieOnAxis("responsetime",1);
$MyData->setAxisName(1,"Hours");
$MyData->setAxisXY(1,AXIS_Y);
$MyData->setAxisPosition(1,AXIS_POSITION_RIGHT);
//$MyData->setAxisDisplay(1,AXIS_FORMAT_TIME,"H:i");

/* Create the 1st scatter chart binding */
$MyData->setScatterSerie("dateline","responsetime",0);
$MyData->setScatterSerieDescription(0,"Ticket responses");
$MyData->setScatterSerieColor(0,array("R"=>0,"G"=>0,"B"=>0));

/* Create the pChart object */
$myPicture = new pImage(700,230,$MyData);

/* Add a border to the picture */
$myPicture->drawRectangle(0,0,699,229,array("R"=>0,"G"=>0,"B"=>0));

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

/* Define the chart area */
$myPicture->setGraphArea(10,10,665,190);

/* Create the Scatter chart object */
$myScatter = new pScatter($myPicture,$MyData);

$AxisBoundaries = array(
0=>array(
"Min"=>$xmin,
"Max"=>$xmax),
1=>array(
"Min"=>0,
"Max"=>$ymax
));

$ScaleSettings = array(
"GridR"=>200,
"GridG"=>200,
"GridB"=>200,
"CycleBackground"=>TRUE,
"Mode"=>SCALE_MODE_MANUAL,
"ManualScale"=>$AxisBoundaries
);

$myScatter->drawScatterScale($ScaleSettings);
//$myScatter->drawScatterScale();

/* Turn on shadow computing */
$myPicture->setShadow(TRUE,array("X"=>1,"Y"=>1,"R"=>0,"G"=>0,"B"=>0,"Alpha"=>10));

/* Draw a scatter plot chart */
$myScatter->drawScatterPlotChart();

$LabelPositions = array(0,1,2);
$LabelCaptions = array('a','b','c');

if ($label == 1) {
    $LabelSettings = array("Decimals"=>1,"ForceLabels"=>$LabelCaptions,"NoTitle"=>TRUE);
    $myScatter->writeScatterLabel(0,$LabelPositions,$LabelSettings);
}

/* Render the picture (choose the best way) */
if ($log!=1) {
   $myPicture->autoOutput("pictures/example.drawScatterPlotChart.png");
}
?>