barcode.pas

FreeReport 2.34 consists of the report engine, designer and previewer, with capabilities comparable

unit Barcode;

{
Barcode Component
Version 1.5 (23 Apr 1999)
Copyright 1998-99 Andreas Schmidt and friends

Freeware

for use with Delphi 2/3/4


this component is for private use only !
i'am not responsible for wrong barcodes

bug-reports, enhancements:
mailto:[e-mail] or [e-mail]

get latest version from
http://members.tripod.de/AJSchmidt/index.html


thanx to Nikolay Simeonov, Wolfgang Koranda, Norbert Waas,
Richard Hugues and Olivier Guilbaud.



Diese Komponente darf nur in privaten Projekten verwendet werden.
Die Weitergabe von ver鋘derte Dateien ist nicht zul鋝sig.
F黵 die Korrektheit der erzeugten Barcodes kann keine Garantie
黚ernommen werden.
Anregungen, Bug-Reports, Danksagungen an:
mailto:[e-mail]



History:
----------------------------------------------------------------------
Version 1.0:
- initial release
Version 1.1:
- more comments
- changed function Code_93Extended (now correct ?)
Version 1.2:
- Bugs (found by Nikolay Simeonov) removed
Version 1.3:
- EAN8/EAN13 added by Wolfgang Koranda ([e-mail])
Version 1.4:
- Bug (found by Norbert Waas) removed
  Component must save the Canvas-properties Font,Pen and Brush
Version 1.5:
- Bug (found by Richard Hugues) removed
  Last line of barcode was 1 Pixel too wide
Version 1.6:
- new read-only property 'Width'



Todo (missing features)
-----------------------
- Code128C not implemented (could someone else
  do this for me ?)
- Wrapper Class for Quick Reports



}



interface

uses
        Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs;

type
        TBarcodeType = (bcCode_2_5_interleaved,
                bcCode_2_5_industrial,
                bcCode_2_5_matrix,
                bcCode39,
                bcCode39Extended,
                bcCode128A,
                bcCode128B,
                bcCode128C,
                bcCode93,
                bcCode93Extended,
                bcCodeMSI,
                bcCodePostNet,
                bcCodeCodabar,
                bcCodeEAN8,
                bcCodeEAN13
                                );


        TBarLineType = (white, black, black_half);  // for internal use only
        // black_half means a black line with 2/5 height (used for PostNet)


        TBarcode = class(TComponent)
        private
          { Private-Deklarationen }
                FHeight : integer;
                FText  : string;
                FTop    : integer;
                FLeft   : integer;
                FModul  : integer;
                FRatio  : double;
                FTyp    : TBarcodeType;
                FCheckSum:boolean;
                FShowText:boolean;
                FAngle  : double;

                modules:array[0..3] of shortint;


                procedure OneBarProps(code:char; var Width:integer; var lt:TBarLineType);

                procedure DoLines(data:string; Canvas:TCanvas);

                function Code_2_5_interleaved:string;
                function Code_2_5_industrial:string;
                function Code_2_5_matrix:string;
                function Code_39:string;
                function Code_39Extended:string;
                function Code_128:string;
                function Code_93:string;
                function Code_93Extended:string;
                function Code_MSI:string;
                function Code_PostNet:string;
                function Code_Codabar:string;
                function Code_EAN8:string;
                function Code_EAN13:string;

                function GetTypText:string;
                procedure MakeModules;

                procedure SetModul(v:integer);

                function GetWidth : integer;

        protected
          { Protected-Deklarationen }
                function MakeData : string;

        public
          { Public-Deklarationen }
                constructor Create(Owner:TComponent); override;
                procedure DrawBarcode(Canvas:TCanvas);
                procedure DrawText(Canvas:TCanvas);
        published
          { Published-Deklarationen }
                // Height of Barcode (Pixel)
                property Height : integer read FHeight write FHeight;
                property Text   : string  read FText   write FText;
                property Top    : integer read FTop    write FTop;
                property Left   : integer read FLeft   write FLeft;
                // Width of the smallest line in a Barcode
                property Modul  : integer read FModul  write SetModul;
                property Ratio  : double  read FRatio  write FRatio;
                property Typ    : TBarcodeType read FTyp write FTyp default bcCode_2_5_interleaved;
                // build CheckSum ?
                property Checksum:boolean read FCheckSum write FCheckSum default FALSE;
                // 0 - 360 degree
                property Angle  :double read FAngle write FAngle;

                property ShowText:boolean read FShowText write FShowText default FALSE;
                property Width : integer read GetWidth;
        end;

// procedure Register; // Removed by TZ

implementation


{
        converts a string from '321' to the internal representation '715'
        i need this function because some pattern tables have a different
        format :

        '00111'
        converts to '05161'

}
function Convert(s:string):string;
var
        i, v : integer;
        t : string;
begin
        t := '';
        for i:=1 to Length(s) do
        begin
                v := ord(s[i]) - 1;

                if odd(i) then
                        Inc(v, 5);
                t := t + Chr(v);
        end;
        Convert := t;
end;

(*
 * Berechne die Quersumme aus einer Zahl x
 * z.B.: Quersumme von 1234 ist 10
 *)
function quersumme(x:integer):integer;
var
        sum:integer;
begin
        sum := 0;

        while x > 0 do
        begin
                sum := sum + (x mod 10);
                x := x div 10;
        end;
        result := sum;
end;


{
        Rotate a Point by Angle 'alpha'
}
function Rotate2D(p:TPoint; alpha:double): TPoint;
var
        sinus, cosinus : Extended;
begin
        sinus   := sin(alpha);
        cosinus := cos(alpha);
        result.x := Round(p.x*cosinus + p.y*sinus);
        result.y := Round(-p.x*sinus + p.y*cosinus);
end;

{
        Move Point a by Vector b
}
function Translate2D(a, b:TPoint): TPoint;
begin
        result.x := a.x + b.x;
        result.y := a.y + b.y;
end;





constructor TBarcode.Create(Owner:TComponent);
begin
        inherited Create(owner);
        FAngle := 0.0;
        FRatio := 2.0;
        FModul := 1;
        FTyp   := bcCodeEAN13;
        FCheckSum := FALSE;
        FShowText := FALSE;
end;


function TBarcode.GetTypText:string;

const bcNames:array[bcCode_2_5_interleaved..bcCodeEAN13] of string =
        (
                ('2_5_interleaved'),
                ('2_5_industrial'),
                ('2_5_matrix'),
                ('Code39'),
                ('Code39 Extended'),
                ('Code128A'),
                ('Code128B'),
                ('Code128C'),
                ('Code93'),
                ('Code93 Extended'),
                ('MSI'),
                ('PostNet'),
                ('Codebar'),
                ('EAN8'),
                ('EAN13')
        );

begin
        result := bcNames[FTyp];
end;



// set Modul Width
procedure TBarcode.SetModul(v:integer);
begin
        if (v >= 1) and (v < 50) then
                FModul := v;
end;


{
calculate the width and the linetype of a sigle bar


  Code   Line-Color      Width               Height
------------------------------------------------------------------
        '0'   white           100%                full
        '1'   white           100%*Ratio          full
        '2'   white           150%*Ratio          full
        '3'   white           200%*Ratio          full
        '5'   black           100%                full
        '6'   black           100%*Ratio          full
        '7'   black           150%*Ratio          full
        '8'   black           200%*Ratio          full
        'A'   black           100%                2/5  (used for PostNet)
        'B'   black           100%*Ratio          2/5  (used for PostNet)
        'C'   black           150%*Ratio          2/5  (used for PostNet)
        'D'   black           200%*Ratio          2/5  (used for PostNet)
}
procedure TBarcode.OneBarProps(code:char; var Width:integer; var lt:TBarLineType);
begin
        case code of
                '0': begin width := modules[0]; lt := white; end;
                '1': begin width := modules[1]; lt := white; end;
                '2': begin width := modules[2]; lt := white; end;
                '3': begin width := modules[3]; lt := white; end;


                '5': begin width := modules[0]; lt := black; end;
                '6': begin width := modules[1]; lt := black; end;
                '7': begin width := modules[2]; lt := black; end;
                '8': begin width := modules[3]; lt := black; end;

                'A': begin width := modules[0]; lt := black_half; end;
                'B': begin width := modules[1]; lt := black_half; end;
                'C': begin width := modules[2]; lt := black_half; end;
                'D': begin width := modules[3]; lt := black_half; end;
        else
                begin
                // something went wrong  :-(
                // mistyped pattern table
                raise Exception.CreateFmt('%s: internal Error', [self.ClassName]);
                end;
        end;
end;


function TBarcode.MakeData : string;
begin
        // calculate the with of the different lines (modules)
        MakeModules;

        // get the pattern of the barcode
        case Typ of
                bcCode_2_5_interleaved: Result := Code_2_5_interleaved;
                bcCode_2_5_industrial:  Result := Code_2_5_industrial;
                bcCode_2_5_matrix:      Result := Code_2_5_matrix;
                bcCode39:               Result := Code_39;
                bcCode39Extended:       Result := Code_39Extended;
                bcCode128A,
                bcCode128B,
                bcCode128C:                                     Result := Code_128;
                bcCode93:               Result := Code_93;
                bcCode93Extended:       Result := Code_93Extended;
                bcCodeMSI:              Result := Code_MSI;
                bcCodePostNet:          Result := Code_PostNet;
                bcCodeCodabar:          Result := Code_Codabar;
                bcCodeEAN8:             Result := Code_EAN8;
                bcCodeEAN13:            Result := Code_EAN13;
        else
                raise Exception.CreateFmt('%s: wrong BarcodeType', [self.ClassName]);
        end;

//Showmessage(Format('Data <%s>', [Result]));
end;



function TBarcode.GetWidth:integer;
var
        data : string;
        i : integer;
        w : integer;
        lt : TBarLineType;
begin
        Result := 0;

        // get barcode pattern
        data := MakeData;

        for i:=1 to Length(data) do  // examine the pattern string
        begin
                OneBarProps(data[i], w, lt);
                Inc(Result, w);
        end;
end;



////////////////////////////// EAN /////////////////////////////////////////

function getEAN(Nr : String) : String;
   var i,fak,sum : Integer;
       tmp   : String;
begin
     sum := 0;
     tmp := copy(nr,1,Length(Nr)-1);
     fak := Length(tmp);
          for i:=1 to length(tmp) do
                        begin
         if (fak mod 2) = 0 then
            sum := sum + (StrToInt(tmp[i])*1)
         else
            sum := sum + (StrToInt(tmp[i])*3);
         dec(fak);
                        end;
     if (sum mod 10) = 0 then
        result := tmp+'0'