system/Debug/Toolbar.php
protected function renderTimeline(array $collectors, $startTime, int $segmentCount, int $segmentDuration, array &$styles): string
	{
		$displayTime = $segmentCount * $segmentDuration;
		$rows = $this->collectTimelineData($collectors);
		$output = '';
		$styleCount = 0;

		foreach ($rows as $row)
		{
			$output .= '<tr>';
			$output .= "<td>{$row['name']}</td>";
			$output .= "<td>{$row['component']}</td>";
			$output .= "<td class='debug-bar-alignRight'>" . number_format($row['duration'] * 1000, 2) . ' ms</td>';
			$output .= "<td class='debug-bar-noverflow' colspan='{$segmentCount}'>";

			$offset = ((($row['start'] - $startTime) * 1000) / $displayTime) * 100;
			$length = (($row['duration'] * 1000) / $displayTime) * 100;

			$styles['debug-bar-timeline-' . $styleCount] = "left: {$offset}%; width: {$length}%;";
			$output .= "<span class='timer debug-bar-timeline-{$styleCount}' title='" . number_format($length, 2) . "%'></span>";
			$output .= '</td>';
			$output .= '</tr>';

			$styleCount++;
		}

		return $output;
	}
protected function renderTimeline(array $collectors, $startTime, int $segmentCount, int $segmentDuration, array &$styles): string
	{
		$displayTime = $segmentCount * $segmentDuration;
		$rows = $this->collectTimelineData($collectors);
		$output = '';
		$styleCount = 0;

		foreach ($rows as $row)
		{
			$output .= '<tr>';
			$output .= "<td>{$row['name']}</td>";
			$output .= "<td>{$row['component']}</td>";
			$output .= "<td class='debug-bar-alignRight'>" . number_format($row['duration'] * 1000, 2) . ' ms</td>';
			$output .= "<td class='debug-bar-noverflow' colspan='{$segmentCount}'>";

			$offset = ((($row['start'] - $startTime) * 1000) / $displayTime) * 100;
			$length = (($row['duration'] * 1000) / $displayTime) * 100;

			$styles['debug-bar-timeline-' . $styleCount] = "left: {$offset}%; width: {$length}%;";
			$output .= "<span class='timer debug-bar-timeline-{$styleCount}' title='" . number_format($length, 2) . "%'></span>";
			$output .= '</td>';
			$output .= '</tr>';

			$styleCount++;
		}

		return $output;
	}
Called within the view to display the timeline itself.

@param array   $collectors
@param float   $startTime
@param integer $segmentCount
@param integer $segmentDuration
@param array   $styles

@return string