/**
  * Build The Bar Gharph.
  *
  * @param  array  $params  assoc array of name/value pairs          
  *
  * @return object $chart   object of open flash chart.
  * @static
  */
 static function &barChart(&$params)
 {
     $chart = null;
     if (empty($params)) {
         return $chart;
     }
     $values = CRM_Utils_Array::value('values', $params);
     if (!is_array($values) || empty($values)) {
         return $chart;
     }
     // get the required data.
     $xValues = $yValues = array();
     foreach ($values as $xVal => $yVal) {
         $yValues[] = (double) $yVal;
         // we has to have x values as string.
         $xValues[] = (string) $xVal;
     }
     $chartTitle = CRM_Utils_Array::value('legend', $params) ? $params['legend'] : ts('Bar Chart');
     //set y axis parameters.
     $yMin = 0;
     // calculate max scale for graph.
     $yMax = ceil(max($yValues));
     if ($mod = $yMax % str_pad(5, strlen($yMax) - 1, 0)) {
         $yMax += str_pad(5, strlen($yMax) - 1, 0) - $mod;
     }
     $ySteps = $yMax / 5;
     // $bar = new bar( );
     // glass seem to be more cool
     $bar = new bar_glass();
     //set values.
     $bar->set_values($yValues);
     // call user define function to handle on click event.
     if ($onClickFunName = CRM_Utils_Array::value('on_click_fun_name', $params)) {
         $bar->set_on_click($onClickFunName);
     }
     // get the currency.
     require_once 'CRM/Utils/Money.php';
     $config = CRM_Core_Config::singleton();
     $symbol = $config->defaultCurrencySymbol;
     // set the tooltip.
     $tooltip = CRM_Utils_Array::value('tip', $params, "{$symbol} #val#");
     $bar->set_tooltip($tooltip);
     // create x axis label obj.
     $xLabels = new x_axis_labels();
     $xLabels->set_labels($xValues);
     // set angle for labels.
     if ($xLabelAngle = CRM_Utils_Array::value('xLabelAngle', $params)) {
         $xLabels->rotate($xLabelAngle);
     }
     // create x axis obj.
     $xAxis = new x_axis();
     $xAxis->set_labels($xLabels);
     //create y axis and set range.
     $yAxis = new y_axis();
     $yAxis->set_range($yMin, $yMax, $ySteps);
     // create chart title obj.
     $title = new title($chartTitle);
     // create chart.
     $chart = new open_flash_chart();
     // add x axis w/ labels to chart.
     $chart->set_x_axis($xAxis);
     // add y axis values to chart.
     $chart->add_y_axis($yAxis);
     // set title to chart.
     $chart->set_title($title);
     // add bar element to chart.
     $chart->add_element($bar);
     // add x axis legend.
     if ($xName = CRM_Utils_Array::value('xname', $params)) {
         $xLegend = new x_legend($xName);
         $xLegend->set_style("{font-size: 13px; color:#000000; font-family: Verdana; text-align: center;}");
         $chart->set_x_legend($xLegend);
     }
     // add y axis legend.
     if ($yName = CRM_Utils_Array::value('yname', $params)) {
         $yLegend = new y_legend($yName);
         $yLegend->set_style("{font-size: 13px; color:#000000; font-family: Verdana; text-align: center;}");
         $chart->set_y_legend($yLegend);
     }
     return $chart;
 }