kicad/include/convert_to_biu.h

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2014-10-22 15:51:34 +00:00
/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* Copyright (C) 2012-2016 Jean-Pierre Charras, jp.charras at wanadoo.fr
* Copyright (C) 1992-2019 KiCad Developers, see CHANGELOG.TXT for contributors.
2014-10-22 15:51:34 +00:00
*
* 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
*/
#ifndef CONVERT_TO_BIU_H_
#define CONVERT_TO_BIU_H_
/**
* @file convert_to_biu.h
*/
/**
* @brief some define and functions to convert a value in mils, decimils or mm
* to the internal unit used in pcbnew, cvpcb or gerbview (nanometer or deci-mil)
* depending on compile time option
*/
/// Scaling factor to convert mils to internal units.
#if defined(PCBNEW) || defined(CVPCB) || defined(GERBVIEW)
#if defined(GERBVIEW)
constexpr double IU_PER_MM = 1e5; // Gerbview IU is 10 nanometers.
#else
constexpr double IU_PER_MM = 1e6; // Pcbnew IU is 1 nanometer.
#endif
constexpr double IU_PER_MILS = IU_PER_MM * 0.0254;
/// Convert mils to PCBNEW internal units (iu).
inline int Mils2iu( int mils )
{
double x = mils * IU_PER_MILS;
return int( x < 0 ? x - 0.5 : x + 0.5 );
}
constexpr inline double Iu2Mils( int iu )
{
double mils = iu / IU_PER_MILS;
return static_cast< int >( mils < 0 ? mils - 0.5 : mils + 0.5 );
}
#elif defined (PL_EDITOR)
constexpr double IU_PER_MM = 1e3; // internal units in micron (should be enough)
constexpr double IU_PER_MILS = (IU_PER_MM * 0.0254);
/// Convert mils to page layout editor internal units (iu).
inline int Mils2iu( int mils )
{
double x = mils * IU_PER_MILS;
return int( x < 0 ? x - 0.5 : x + 0.5 );
}
#elif defined (EESCHEMA) // Eeschema
constexpr double IU_PER_MM = 1e4; // Schematic internal units 1=100nm
constexpr double IU_PER_MILS = IU_PER_MM * 0.0254;
constexpr inline int Mils2iu( int mils )
{
double x = mils * IU_PER_MILS;
return int( x < 0 ? x - 0.5 : x + 0.5 );
}
constexpr inline int Iu2Mils( int iu )
{
double mils = iu / IU_PER_MILS;
return static_cast< int >( mils < 0 ? mils - 0.5 : mils + 0.5 );
}
#else
// Here, we do not know the value of internal units: do not define
// conversion functions (They do not have meaning)
#define UNKNOWN_IU
#endif
#ifndef UNKNOWN_IU
// Other definitions used in a few files
constexpr double MM_PER_IU = ( 1 / IU_PER_MM );
/// Convert mm to internal units (iu).
constexpr inline int Millimeter2iu( double mm )
{
return (int) ( mm < 0 ? mm * IU_PER_MM - 0.5 : mm * IU_PER_MM + 0.5 );
}
/// Convert mm to internal units (iu).
constexpr inline double Iu2Millimeter( int iu )
{
return iu / IU_PER_MM;
}
/// Convert mm to internal units (iu).
// constexpr inline double Iu2Mils( int iu )
// {
// return iu / IU_PER_MILS;
// }
// The max error is the distance between the middle of a segment, and the circle
// for circle/arc to segment approximation.
// Warning: too small values can create very long calculation time in zone filling
// 0.05 to 0.005 mm are reasonable values
constexpr int ARC_LOW_DEF = Millimeter2iu( 0.02 );
constexpr int ARC_HIGH_DEF = Millimeter2iu( 0.005 );
#endif
#endif // CONVERT_TO_BIU_H_