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52 lines
1.9 KiB
52 lines
1.9 KiB
/*
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* This program source code file is part of KiCad, a free EDA CAD application.
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*
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* Copyright (C) 2011-2014 Jean-Pierre Charras
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* Copyright (C) 2004-2016 KiCad Developers, see change_log.txt for contributors.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, you may find one here:
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* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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* or you may search the http://www.gnu.org website for the version 2 license,
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* or you may write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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/*
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* @file units_scales.h
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*/
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// Inside calculations, units are always meter, Hz, Ohm and Radian
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// These units are not very easy to handle, so we use conversion constants
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#ifndef UNITS_SCALES_H
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#define UNITS_SCALES_H
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#define UNIT_MM 1e-3 // mm to meter
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#define UNIT_CM 1e-2 // cm to meter
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#define UNIT_MICRON 1e-6 // um to meter
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#define UNIT_INCH (1e-2*2.54) // inch to meter
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#define UNIT_MIL (1e-5*2.54) // mil (or thou) to meter
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#define UNIT_OZSQFT (34.40*UNIT_MICRON) // 1 oz/ft^2 is 34.30 microns nominal, 30.90 minimum
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#define UNIT_GHZ 1e9
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#define UNIT_MHZ 1e6
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#define UNIT_KHZ 1e3
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#define UNIT_DEGREE (M_PI/180.0) // degree to radian
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#define UNIT_RADIAN 1.0 // Radian to radian
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#define UNIT_OHM 1.0 // Ohm to Ohm
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#define UNIT_KOHM 1e3 // KOhm to Ohm
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#endif // UNITS_SCALES_H
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