Graph::GetColour PHP Method

    protected function GetColour($key, $no_gradient = FALSE)
    {
        $colour = 'none';
        if (isset($this->colours[$key])) {
            $colour = $this->colours[$key];
            if (is_array($colour)) {
                if ($no_gradient) {
                    // grab the first colour in the array, discarding opacity
                    list($colour) = explode(':', $colour[0]);
                } else {
                    if (!isset($this->gradients[$key])) {
                        $this->gradients[$key] = $this->NewID();
                    }
                    $colour = 'url(#' . $this->gradients[$key] . ')';
                }
            }
        }
        return $colour;
    }