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/*
* This program source code file is part of KiCad, a free EDA CAD application. * * Copyright (C) 2010-2014 Jean-Pierre Charras jp.charras at wanadoo.fr * Copyright (C) 1992-2023 KiCad Developers, see AUTHORS.txt for contributors. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, you may find one here: * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
* or you may search the http://www.gnu.org website for the version 2 license,
* or you may write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA */
#include <math/util.h> // for KiROUND
#include <gerber_file_image.h>
#include <base_units.h>
/* These routines read the text string point from Text.
* On exit, Text points the beginning of the sequence unread */
// conversion scale from gerber file units to Gerbview internal units
// depending on the gerber file format
// this scale list assumes gerber units are imperial.
// for metric gerber units, the imperial to metric conversion is made in read functions
#define SCALE_LIST_SIZE 9
static double scale_list[SCALE_LIST_SIZE] ={ 1000.0 * GERB_IU_PER_MM * 0.0254, // x.1 format (certainly useless)
100.0 * GERB_IU_PER_MM * 0.0254, // x.2 format (certainly useless)
10.0 * GERB_IU_PER_MM * 0.0254, // x.3 format
1.0 * GERB_IU_PER_MM * 0.0254, // x.4 format
0.1 * GERB_IU_PER_MM * 0.0254, // x.5 format
0.01 * GERB_IU_PER_MM * 0.0254, // x.6 format
0.001 * GERB_IU_PER_MM * 0.0254, // x.7 format (currently the max allowed precision)
0.0001 * GERB_IU_PER_MM * 0.0254, // provided, but not used
0.00001 * GERB_IU_PER_MM * 0.0254, // provided, but not used
};
/**
* Convert a coordinate given in floating point to GerbView's internal units * (currently = 10 nanometers). */int scaletoIU( double aCoord, bool isMetric ){ int ret;
if( isMetric ) // gerber are units in mm
ret = KiROUND( aCoord * GERB_IU_PER_MM ); else // gerber are units in inches
ret = KiROUND( aCoord * GERB_IU_PER_MM * 25.4 );
return ret;}
// An useful function used when reading gerber files
static bool IsNumber( char x ){ return ( ( x >= '0' ) && ( x <='9' ) ) || ( x == '-' ) || ( x == '+' ) || ( x == '.' );}
VECTOR2I GERBER_FILE_IMAGE::ReadXYCoord( char*& aText, bool aExcellonMode ){ VECTOR2I pos( 0, 0 ); bool is_float = false;
std::string line;
// Reserve the anticipated length plus an optional sign and decimal
line.reserve( std::max( m_FmtLen.x, m_FmtLen.y ) + 3 );
// Set up return value for case where aText == nullptr
if( !m_Relative ) pos = m_CurrentPos;
if( aText == nullptr ) return pos;
while( *aText && ( ( *aText == 'X' ) || ( *aText == 'Y' ) || ( *aText == 'A' ) ) ) { double decimal_scale = 1.0; int nbdigits = 0; int current_coord = 0; char type_coord = *aText++;
line.clear();
while( IsNumber( *aText ) ) { if( *aText == '.' ) // Force decimal format if reading a floating point number
is_float = true;
// count digits only (sign and decimal point are not counted)
if( (*aText >= '0') && (*aText <='9') ) nbdigits++;
line.push_back( *( aText++ ) ); }
double val = strtod( line.data(), nullptr );
if( is_float ) { current_coord = scaletoIU( val, m_GerbMetric ); } else { int fmt_scale = (type_coord == 'X') ? m_FmtScale.x : m_FmtScale.y;
if( m_NoTrailingZeros ) { // no trailing zero format, we need to add missing zeros.
int digit_count = (type_coord == 'X') ? m_FmtLen.x : m_FmtLen.y;
// Truncate the extra digits if the len is more than expected
// because the conversion to internal units expect exactly
// digit_count digits. Alternatively, add some additional digits
// to pad out to the missing zeros
if( nbdigits < digit_count || ( aExcellonMode && ( nbdigits > digit_count ) ) ) decimal_scale = std::pow<double>( 10, digit_count - nbdigits ); }
double real_scale = scale_list[fmt_scale];
if( m_GerbMetric ) real_scale = real_scale / 25.4;
current_coord = KiROUND( val * real_scale * decimal_scale ); }
if( type_coord == 'X' ) { pos.x = current_coord; } else if( type_coord == 'Y' ) { pos.y = current_coord; } else if( type_coord == 'A' ) { m_ArcRadius = current_coord; m_LastArcDataType = ARC_INFO_TYPE_RADIUS; } }
if( m_Relative ) pos += m_CurrentPos;
m_CurrentPos = pos; return pos;}
VECTOR2I GERBER_FILE_IMAGE::ReadIJCoord( char*& aText ){ VECTOR2I pos( 0, 0 ); bool is_float = false;
std::string line;
// Reserve the anticipated length plus an optional sign and decimal
line.reserve( std::max( m_FmtLen.x, m_FmtLen.y ) + 3 );
if( aText == nullptr ) return pos;
while( *aText && ( ( *aText == 'I' ) || ( *aText == 'J' ) ) ) { double decimal_scale = 1.0; int nbdigits = 0; int current_coord = 0; char type_coord = *aText++;
line.clear();
while( IsNumber( *aText ) ) { if( *aText == '.' ) // Force decimal format if reading a floating point number
is_float = true;
// count digits only (sign and decimal point are not counted)
if( (*aText >= '0') && (*aText <='9') ) nbdigits++;
line.push_back( *( aText++ ) ); }
double val = strtod( line.data(), nullptr );
if( is_float ) { current_coord = scaletoIU( val, m_GerbMetric ); } else { int fmt_scale = ( type_coord == 'I' ) ? m_FmtScale.x : m_FmtScale.y;
if( m_NoTrailingZeros ) { // no trailing zero format, we need to add missing zeros.
int digit_count = ( type_coord == 'I' ) ? m_FmtLen.x : m_FmtLen.y;
// Truncate the extra digits if the len is more than expected
// because the conversion to internal units expect exactly
// digit_count digits. Alternatively, add some additional digits
// to pad out to the missing zeros
if( nbdigits < digit_count ) decimal_scale = std::pow<double>( 10, digit_count - nbdigits ); }
double real_scale = scale_list[fmt_scale];
if( m_GerbMetric ) real_scale = real_scale / 25.4;
current_coord = KiROUND( val * real_scale * decimal_scale ); }
if( type_coord == 'I' ) { pos.x = current_coord; } else if( type_coord == 'J' ) { pos.y = current_coord; } }
m_IJPos = pos; m_LastArcDataType = ARC_INFO_TYPE_CENTER; m_LastCoordIsIJPos = true;
return pos;}
// Helper functions:
/**
* Read an integer from an ASCII character buffer. * * If there is a comma after the integer, then skip over that. * * @param text is a reference to a character pointer from which bytes are read * and the pointer is advanced for each byte read. * @param aSkipSeparator set to true (default) to skip comma. * @return The integer read in. */int ReadInt( char*& text, bool aSkipSeparator = true ){ int ret;
// For strtol, a string starting by 0X or 0x is a valid number in hexadecimal or octal.
// However, 'X' is a separator in Gerber strings with numbers.
// We need to detect that
if( strncasecmp( text, "0X", 2 ) == 0 ) { text++; ret = 0; } else { ret = (int) strtol( text, &text, 10 ); }
if( *text == ',' || isspace( *text ) ) { if( aSkipSeparator ) ++text; }
return ret;}
/**
* Read a double precision floating point number from an ASCII character buffer. * * If there is a comma after the number, then skip over that. * * @param text is a reference to a character pointer from which the ASCII double * is read from and the pointer advanced for each character read. * @param aSkipSeparator set to true (default) to skip comma. * @return number read. */double ReadDouble( char*& text, bool aSkipSeparator = true ){ double ret;
// For strtod, a string starting by 0X or 0x is a valid number in hexadecimal or octal.
// However, 'X' is a separator in Gerber strings with numbers.
// We need to detect that
if( strncasecmp( text, "0X", 2 ) == 0 ) { text++; ret = 0.0; } else { ret = strtod( text, &text ); }
if( *text == ',' || isspace( *text ) ) { if( aSkipSeparator ) ++text; }
return ret;}
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