Piwik\Plugins\CoreVisualizations\Visualizations\Cloud::getPercentage PHP Method

    private function getPercentage($popularity, $maxValue)
    {
        // case hideFutureHoursWhenToday=1 shows hours with no visits
        if ($maxValue == 0) {
            return 0;
        }
        $percent = $popularity / $maxValue * 100;
        return $percent;
    }