HorizontalBarGraph::Bar PHP Method

    protected function Bar($value, &$bar)
    {
        $x0 = $this->pad_left + $this->x0;
        $l1 = $this->ClampHorizontal($x0);
        $l2 = $this->ClampHorizontal($x0 + $value * $this->bar_unit_width);
        $bar['x'] = min($l1, $l2);
        $bar['width'] = abs($l1 - $l2);
    }