//---------------------------------------------------------------------------
// Generowanie kodow kreskowych CODE 11
// www.algorytm.org
// (c)2006 Tomasz Lubinski
//---------------------------------------------------------------------------

#include <vcl.h>
#pragma hdrstop

#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"

char code11sign[11] = {
      '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
      '-'};

char code11bars[11][7] = {
        {1, 0, 1, 0, 1, 1, 0},
        {1, 1, 0, 1, 0, 1, 1},
        {1, 0, 0, 1, 0, 1, 1},
        {1, 1, 0, 0, 1, 0, 1},
        {1, 0, 1, 1, 0, 1, 1},
        {1, 1, 0, 1, 1, 0, 1},
        {1, 0, 0, 1, 1, 0, 1},
        {1, 0, 1, 0, 0, 1, 1},
        {1, 1, 0, 1, 0, 0, 1},
        {1, 1, 0, 1, 0, 1, 0},
        {1, 0, 1, 1, 0, 1, 0}
        };

char code11bars_length[11] = {
        6, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6
        };

char start_stop[7] = {
        1, 0, 1, 1, 0, 0, 1
        };
char start_stop_length = 7;

TForm1 *Form1;
int curentPos;


// returns 1 if letter is correct, 0 otherwise
int checkLetter(char ch)
{
        for (int i=0; i<11; i++)
                if (code11sign[i] == ch)
                        return 1;

        return 0;
}

// reurns 1 if txt is correct, 0 otherwise
int check(char *txt)
{
        for (unsigned int i=0; i<strlen(txt); i++)
                if (checkLetter(txt[i]) == 0)
                        return 0;

        return 1;
}

// returns letter value for check digit
int getLetterValue(char ch)
{
        for (int i=0; i<11; i++)
                if (code11sign[i] == ch)
                        return i;

        return 0;
}

// return check digit C
int checkDigitC(char *txt)
{
        int sum = 0;
        int w = 0;

        for (int i=strlen(txt)-1; i>=0; i--)
        {
                sum += (getLetterValue(txt[i]) * ((w % 10) + 1));
                w++;
        }

        return (sum % 11);

}

// return check digit K
int checkDigitK(char *txt)
{
        int sum = 0;
        int w = 0;

        for (int i=strlen(txt)-1; i>=0; i--)
        {
                sum += (getLetterValue(txt[i]) * ((w % 9) + 1));
                w++;
        }

        return (sum % 11);

}


void drawSignBars(char bars[], int length)
{
        Form1->Image1->Canvas->Brush->Color = clBlack;

        //print bars
        for (int i=0; i<length; i++)
        {
                if (bars[i] == 1)
                        Form1->Image1->Canvas->Rectangle(curentPos + 20, 10, curentPos + 22, 100);

                curentPos += 2;
        }
        curentPos += 2;
}

void drawBars(char *txt)
{
        char c, k;
        char text[1000];
        char tmp[2];

        strcpy(text, txt);

        curentPos = 0;
        Form1->Image1->Canvas->Brush->Color = clWhite;
        Form1->Image1->Canvas->Rectangle(0, 0, 441, 121);

        //print start character
        drawSignBars(start_stop, start_stop_length);

        //print characters
        for (unsigned int i=0; i<strlen(txt); i++)
                for (int j=0; j<11; j++)
                        if (code11sign[j] == txt[i])
                        {
                                drawSignBars(code11bars[j], code11bars_length[j]);
                                break;
                        }

        //print check digit C
        c = checkDigitC(txt);
        drawSignBars(code11bars[c], code11bars_length[c]);
        tmp[0] = code11sign[c];
        tmp[1] = 0;
        strcat(text, tmp);

        if (strlen(txt)>9)
        {
             //print check digit K
             k = checkDigitK(text);
             drawSignBars(code11bars[k], code11bars_length[k]);
             tmp[0] = code11sign[k];
             tmp[1] = 0;
             strcat(text, tmp);
        }

        //print stop character
        drawSignBars(start_stop, start_stop_length);

        //Draw text
        Form1->Image1->Canvas->Font->Size = 10;
        Form1->Image1->Canvas->Brush->Color = clWhite;
        Form1->Image1->Canvas->Font->Color = clBlack;
        Form1->Image1->Canvas->TextOut(curentPos/2 + 20 - strlen(txt)*3, 100, text);
}

//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
        : TForm(Owner)
{
}
//---------------------------------------------------------------------------


void __fastcall TForm1::Button1Click(TObject *Sender)
{
        if (check(Kod->Text.c_str()) == 0)
        {
                ShowMessage("Incorrect text");
                return;
        }

        drawBars(Kod->Text.c_str());
}
//---------------------------------------------------------------------------