显示code39条形码的PHP类[2]

        $this->patten[]=new pattenclass("#ffffff",1*$this->zoom);
        $this->patten[]=new pattenclass("#ffffff",3*$this->zoom);
        $this->patten[]=new pattenclass("#000000",1*$this->zoom);
        $this->patten[]=new pattenclass("#000000",3*$this->zoom);
    }
    function makecode($code)//code39解码
    {
        switch ($code)
        {
            case "0":return ("202130302");
            case "1":return ("302120203");
            case "2":return ("203120203");
            case "3":return ("303120202");
            case "4":return ("202130203");
            case "5":return ("302130202");
            case "6":return ("203130202");
            case "7":return ("202120303");
            case "8":return ("302120302");
            case "9":return ("203120302");
            case "a":return ("302021203");
            case "b":return ("203021203");