Graph::Canvas PHP Метод

    protected function Canvas($id)
    {
        $bg = $this->BackgroundImage();
        $canvas = array('width' => '100%', 'height' => '100%', 'fill' => $this->back_colour, 'stroke-width' => 0);
        if ($this->back_round) {
            $canvas['rx'] = $canvas['ry'] = $this->back_round;
        }
        if ($bg == '' && $this->back_stroke_width) {
            $canvas['stroke-width'] = $this->back_stroke_width;
            $canvas['stroke'] = $this->back_stroke_colour;
        }
        $c_el = $this->Element('rect', $canvas);
        // create a clip path for rounded rectangle
        if ($this->back_round) {
            $this->defs[] = $this->Element('clipPath', array('id' => $id), NULL, $c_el);
        }
        // if the background image is an element, insert it between the background
        // colour and border rect
        if ($bg != '') {
            $c_el .= $bg;
            if ($this->back_stroke_width) {
                $canvas['stroke-width'] = $this->back_stroke_width;
                $canvas['stroke'] = $this->back_stroke_colour;
                $canvas['fill'] = 'none';
                $c_el .= $this->Element('rect', $canvas);
            }
        }
        return $c_el;
    }