kicad/pcb_calculator/units_scales.h

49 lines
1.7 KiB
C

/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* Copyright (C) 2011-2014 Jean-Pierre Charras
* Copyright (C) 2004-2021 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 3
* 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, see <http://www.gnu.org/licenses/>.
*/
/**
* @file units_scales.h
*/
// Inside calculations, units are always meter, Hz, Ohm and Radian
// These units are not very easy to handle, so we use conversion constants
#ifndef UNITS_SCALES_H
#define UNITS_SCALES_H
#define UNIT_MM 1e-3 // mm to meter
#define UNIT_CM 1e-2 // cm to meter
#define UNIT_MICRON 1e-6 // um to meter
#define UNIT_INCH (1e-2*2.54) // inch to meter
#define UNIT_MIL (1e-5*2.54) // mil (or thou) to meter
#define UNIT_OZSQFT (34.40*UNIT_MICRON) // 1 oz/ft^2 is 34.30 microns nominal, 30.90 minimum
#define UNIT_GHZ 1e9
#define UNIT_MHZ 1e6
#define UNIT_KHZ 1e3
#define UNIT_DEGREE (M_PI/180.0) // degree to radian
#define UNIT_RADIAN 1.0 // Radian to radian
#define UNIT_OHM 1.0 // Ohm to Ohm
#define UNIT_KOHM 1e3 // KOhm to Ohm
#endif // UNITS_SCALES_H