public function getUrl(DataTable $data, $width, $height, $title = null, $params = array(), $rawParams = array()) {
        
        $title      = isset($title) ? $title: null;
        $titleSize  = isset($params['titleSize']) ? $params['titleSize']: null;
        $titleColor  = isset($params['titleColor']) ? $params['titleColor']: $this->options['titleColor'];
        $withLabels = isset($params['withLabels']) ? $params['withLabels']: $this->options['withLabels'];
        $withLegend = isset($params['withLegend']) ? $params['withLegend']: $this->options['withLegend'];
        $transparent = isset($params['transparent']) ? $params['transparent']: $this->options['transparent'];
        $backgroundFillColor = isset($params['backgroundFillColor']) ? $params['backgroundFillColor']: null;
        $color = isset($params['color']) ? $params['color']: null;
        
        if (is_array($color)) {
            $color = implode('|', $color);
        } else {
            $color = $color? $color: null;
        }
        
        $labels = null;
        if ($withLabels) {
            $labels = implode('|', $data->getLabels());
        }
        //still no legend but should have one?  Take the default one...
        $legendString = $this->getLegendParamValue($data);
        
        $dataString = $this->getValueParamValue($data);
        
        //backgroundFill
        if (!is_null($backgroundFillColor)) {
            $chf = 'bg';
            if ($transparent) {
                $chf = 'a';
            }
            $chf = $chf . ',s,' . $backgroundFillColor;
        }
        $params = array(
            'chd' => $dataString,
            'cht'  => static::CHART_TYPE,
            'chs'  => $width . 'x' . $height,
            'chco' => $color,
            'chtt' => $title,
            'chts' => $titleColor . ',' . $titleSize,
            'chl'  => isset($labels)? $labels : null,
            'chdl' => isset($legendString)? $legendString : null,
            'chf'  => isset($chf)? $chf : null,
        );
        
        $params = array_merge($params, $rawParams);
        
        return self::BuildUrl($params);
    }