function addIndicator($height)
{
#create a new chart object
$ret = new XYChart($this->m_totalWidth, $height + $this->m_topMargin + $this->m_bottomMargin, Transparent);
$ret->setTrimData($this->m_extraPoints);
if ($this->m_currentChart != null) {
#if there is a chart before the newly created chart, disable its x-axis, and copy
#its x-axis labels to the new chart
$this->m_currentChart->xAxis->setColors(Transparent, Transparent);
$ret->xAxis->copyAxis($this->m_currentChart->xAxis);
#add chart to MultiChart and update the total height
$this->addChart(0, $this->m_totalHeight + $this->m_plotAreaGap, $ret);
$this->m_totalHeight = $this->m_totalHeight + $height + 1 + $this->m_plotAreaGap;
} else {
#no existing chart - create the x-axis labels from scratch
$this->setXLabels($ret->xAxis);
#add chart to MultiChart and update the total height
$this->addChart(0, $this->m_totalHeight, $ret);
$this->m_totalHeight = $this->m_totalHeight + $height + 1;
}
#the newly created chart becomes the current chart
$this->m_currentChart = $ret;
#update the size
$this->setSize($this->m_totalWidth, $this->m_totalHeight + $this->m_topMargin + $this->m_bottomMargin);
#configure the plot area
$plotAreaObj = $ret->setPlotArea($this->m_leftMargin, $this->m_topMargin, $this->m_totalWidth - $this->m_leftMargin - $this->m_rightMargin, $height, $this->m_plotAreaBgColor, -1, $this->m_plotAreaBorder);
$plotAreaObj->setGridColor($this->m_majorHGridColor, $this->m_majorVGridColor, $this->m_minorHGridColor, $this->m_minorVGridColor);
$ret->setAntiAlias($this->m_antiAlias);
#configure legend box
$box = $ret->addLegend($this->m_leftMargin, $this->m_topMargin, false, $this->m_legendFont, $this->m_legendFontSize);
$box->setFontColor($this->m_legendFontColor);
$box->setBackground($this->m_legendBgColor);
$box->setMargin2(5, 0, 2, 1);
$box->setSize($this->m_totalWidth - $this->m_leftMargin - $this->m_rightMargin + 1, 0);
#configure x-axis
$a = $ret->xAxis;
$a->setIndent(true);
$a->setTickLength(2, 0);
$a->setColors(Transparent, $this->m_xAxisFontColor, $this->m_xAxisFontColor, $this->m_xAxisFontColor);
$a->setLabelStyle($this->m_xAxisFont, $this->m_xAxisFontSize, $this->m_xAxisFontColor, $this->m_xAxisFontAngle);
#configure y-axis
$ret->setYAxisOnRight($this->m_axisOnRight);
$this->configureYAxis($ret->yAxis, $height);
return $ret;
}
