function renderPositionChangeDiff($rows, $day)
{
$output = "";
if ($rows) {
$lastAveragePosition = 0;
foreach ($rows as $row) {
$averagePosition = $row->averagePosition;
if ($lastAveragePosition != $averagePosition) {
if ($lastAveragePosition) {
$diff = (double) ($averagePosition - $lastAveragePosition);
$diffColor = ExtraWatchTrendHTML::getDiffColor($diff, TRUE);
$diffImg = "<img src='" . $this->extraWatch->config->getLiveSiteWithSuffix() . "components/com_extrawatch/img/icons/trend_{$diffColor}.gif' border='0'/>";
if ($day == $row->date || !$day) {
$output .= sprintf("<td style='color: {$diffColor}' align='right'>%+.2f</td><td>{$diffImg}</td><td class='ewCentered'>%s</td>", $diff, ExtraWatchDate::getDateByDay($row->date));
}
}
$lastAveragePosition = $averagePosition;
}
}
}
return $output;
}
