kicad/pcb_calculator/units_scales.h

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2014-10-23 17:53:38 +00:00
/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* Copyright (C) 2011-2014 Jean-Pierre Charras
* Copyright (C) 2004-2014 KiCad Developers, see change_log.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
*/
/*
* @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_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