Piwik\Plugins\CoreHome\DataTableRowAction\RowEvolution::getMetricsToggles PHP Method

    protected function getMetricsToggles()
    {
        $i = 0;
        $metrics = array();
        foreach ($this->availableMetrics as $metric => $metricData) {
            $unit = Metrics::getUnit($metric, $this->idSite);
            $change = isset($metricData['change']) ? $metricData['change'] : false;
            list($first, $last) = $this->getFirstAndLastDataPointsForMetric($metric);
            $details = Piwik::translate('RowEvolution_MetricBetweenText', array(NumberFormatter::getInstance()->format($first), NumberFormatter::getInstance()->format($last)));
            if ($change !== false) {
                $lowerIsBetter = Metrics::isLowerValueBetter($metric);
                if (substr($change, 0, 1) == '+') {
                    $changeClass = $lowerIsBetter ? 'bad' : 'good';
                    $changeImage = $lowerIsBetter ? 'arrow_up_red' : 'arrow_up';
                } else {
                    if (substr($change, 0, 1) == '-') {
                        $changeClass = $lowerIsBetter ? 'good' : 'bad';
                        $changeImage = $lowerIsBetter ? 'arrow_down_green' : 'arrow_down';
                    } else {
                        $changeClass = 'neutral';
                        $changeImage = false;
                    }
                }
                $change = '<span class="' . $changeClass . '">' . ($changeImage ? '<img src="plugins/MultiSites/images/' . $changeImage . '.png" /> ' : '') . $change . '</span>';
                $details .= ', ' . Piwik::translate('RowEvolution_MetricChangeText', $change);
            }
            // set metric min/max text (used as tooltip for details)
            $max = isset($metricData['max']) ? $metricData['max'] : 0;
            $min = isset($metricData['min']) ? $metricData['min'] : 0;
            $min .= $unit;
            $max .= $unit;
            $minmax = Piwik::translate('RowEvolution_MetricMinMax', array($metricData['name'], NumberFormatter::getInstance()->formatNumber($min), NumberFormatter::getInstance()->formatNumber($max)));
            $newMetric = array('label' => $metricData['name'], 'details' => $details, 'minmax' => $minmax, 'sparkline' => $this->getSparkline($metric));
            // Multi Rows, each metric can be for a particular row and display an icon
            if (!empty($metricData['logo'])) {
                $newMetric['logo'] = $metricData['logo'];
            }
            // TODO: this check should be determined by metric metadata, not hardcoded here
            if ($metric == 'nb_users' && $first == 0 && $last == 0) {
                $newMetric['hide'] = true;
            }
            $metrics[] = $newMetric;
            $i++;
        }
        return $metrics;
    }