Incorporated glbarcode library into source tree.
This commit is contained in:
Jim Evins
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/* BarcodeCode39.cpp
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*
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* Copyright (C) 2013 Jim Evins <evins@snaught.com>
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*
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* This file is part of glbarcode++.
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*
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* glbarcode++ is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* glbarcode++ is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with glbarcode++. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "BarcodeCode39.h"
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#include "Constants.h"
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#include <cctype>
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#include <algorithm>
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using namespace glbarcode::Constants;
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namespace
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{
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/* Code 39 alphabet. Position indicates value. */
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const std::string alphabet = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ-. $/+%";
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/* Code 39 symbols. Position must match position in alphabet. */
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const std::string symbols[] = {
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/* BsBsBsBsB */
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/* 0 */ "NnNwWnWnN",
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/* 1 */ "WnNwNnNnW",
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/* 2 */ "NnWwNnNnW",
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/* 3 */ "WnWwNnNnN",
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/* 4 */ "NnNwWnNnW",
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/* 5 */ "WnNwWnNnN",
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/* 6 */ "NnWwWnNnN",
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/* 7 */ "NnNwNnWnW",
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/* 8 */ "WnNwNnWnN",
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/* 9 */ "NnWwNnWnN",
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/* A */ "WnNnNwNnW",
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/* B */ "NnWnNwNnW",
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/* C */ "WnWnNwNnN",
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/* D */ "NnNnWwNnW",
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/* E */ "WnNnWwNnN",
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/* F */ "NnWnWwNnN",
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/* G */ "NnNnNwWnW",
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/* H */ "WnNnNwWnN",
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/* I */ "NnWnNwWnN",
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/* J */ "NnNnWwWnN",
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/* K */ "WnNnNnNwW",
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/* L */ "NnWnNnNwW",
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/* M */ "WnWnNnNwN",
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/* N */ "NnNnWnNwW",
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/* O */ "WnNnWnNwN",
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/* P */ "NnWnWnNwN",
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/* Q */ "NnNnNnWwW",
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/* R */ "WnNnNnWwN",
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/* S */ "NnWnNnWwN",
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/* T */ "NnNnWnWwN",
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/* U */ "WwNnNnNnW",
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/* V */ "NwWnNnNnW",
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/* W */ "WwWnNnNnN",
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/* X */ "NwNnWnNnW",
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/* Y */ "WwNnWnNnN",
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/* Z */ "NwWnWnNnN",
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/* - */ "NwNnNnWnW",
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/* . */ "WwNnNnWnN",
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/* */ "NwWnNnWnN",
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/* $ */ "NwNwNwNnN",
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/* / */ "NwNwNnNwN",
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/* + */ "NwNnNwNwN",
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/* % */ "NnNwNwNwN"
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};
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const std::string frameSymbol = "NwNnWnWnN";
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/* Vectorization constants */
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const double MIN_X = ( 0.01 * PTS_PER_INCH );
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const double N = 2.5;
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const double MIN_I = MIN_X;
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const double MIN_HEIGHT = ( 0.25 * PTS_PER_INCH );
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const double MIN_QUIET = ( 0.10 * PTS_PER_INCH );
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const double MIN_TEXT_AREA_HEIGHT = 14.0;
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const double MIN_TEXT_SIZE = 10.0;
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}
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namespace glbarcode
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{
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/*
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* Static Code39 barcode creation method
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*/
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Barcode* BarcodeCode39::create( void )
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{
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return new BarcodeCode39();
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}
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/*
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* Code39 data validation, implements Barcode1dBase::validate()
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*/
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bool BarcodeCode39::validate( const std::string& rawData )
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{
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for ( unsigned int i = 0; i < rawData.size(); i++ )
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{
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char c = toupper( rawData[i] );
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if ( alphabet.find(c) == std::string::npos )
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{
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return false;
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}
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}
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return true;
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}
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/*
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* Code39 data encoding, implements Barcode1dBase::encode()
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*/
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std::string BarcodeCode39::encode( const std::string& cookedData )
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{
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std::string code;
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/* Left frame symbol */
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code += frameSymbol;
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code += "i";
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int sum = 0;
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for ( unsigned int i=0; i < cookedData.size(); i++ )
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{
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int cValue = alphabet.find( toupper( cookedData[i] ) );
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code += symbols[cValue];
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code += "i";
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sum += cValue;
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}
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if ( checksum() )
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{
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code += symbols[sum % 43];
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code += "i";
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}
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/* Right frame bar */
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code += frameSymbol;
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return code;
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}
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/*
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* Code39 prepare text for display, implements Barcode1dBase::prepareText()
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*/
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std::string BarcodeCode39::prepareText( const std::string& rawData )
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{
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std::string displayText;
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for ( unsigned int i = 0; i < rawData.size(); i++ )
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{
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displayText += toupper( rawData[i] );
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}
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return displayText;
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}
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/*
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* Code39 vectorization, implements Barcode1dBase::vectorize()
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*/
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void BarcodeCode39::vectorize( const std::string& codedData,
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const std::string& displayText,
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const std::string& cookedData,
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double& w,
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double& h )
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{
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/* determine width and establish horizontal scale, based on original cooked data */
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double dataSize = cookedData.size();
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double minL;
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if ( !checksum() )
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{
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minL = (dataSize + 2)*(3*N + 6)*MIN_X + (dataSize + 1)*MIN_I;
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}
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else
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{
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minL = (dataSize + 3)*(3*N + 6)*MIN_X + (dataSize + 2)*MIN_I;
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}
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double scale;
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if ( w == 0 )
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{
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scale = 1.0;
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}
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else
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{
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scale = w / (minL + 2*MIN_QUIET);
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if ( scale < 1.0 )
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{
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scale = 1.0;
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}
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}
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double width = minL * scale;
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/* determine text parameters */
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double hTextArea = scale * MIN_TEXT_AREA_HEIGHT;
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double textSize = scale * MIN_TEXT_SIZE;
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/* determine height of barcode */
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double height = showText() ? h - hTextArea : h;
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height = std::max( height, std::max( 0.15*width, MIN_HEIGHT ) );
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/* determine horizontal quiet zone */
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double xQuiet = std::max( (10 * scale * MIN_X), MIN_QUIET );
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/* Now traverse the code string and draw each bar */
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double x1 = xQuiet;
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for ( unsigned int i=0; i < codedData.size(); i++ )
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{
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double lwidth;
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switch ( codedData[i] )
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{
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case 'i':
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/* Inter-character gap */
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x1 += scale * MIN_I;
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break;
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case 'N':
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/* Narrow bar */
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lwidth = scale*MIN_X;
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addLine( x1, 0.0, lwidth, height );
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x1 += scale * MIN_X;
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break;
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case 'W':
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/* Wide bar */
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lwidth = scale*N*MIN_X;
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addLine( x1, 0.0, lwidth, height );
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x1 += scale * N * MIN_X;
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break;
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case 'n':
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/* Narrow space */
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x1 += scale * MIN_X;
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break;
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case 'w':
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/* Wide space */
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x1 += scale * N * MIN_X;
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break;
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default:
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// NOT REACHED
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break;
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}
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}
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if ( showText() )
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{
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std::string starredText = "*" + displayText + "*";
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addText( xQuiet + width/2, height + (hTextArea+0.7*textSize)/2, textSize, starredText );
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}
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/* Overwrite requested size with actual size. */
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w = width + 2*xQuiet;
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h = showText() ? height + hTextArea : height;
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}
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}
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