kicad/pcb_calculator/units_scales.h

/*
 * 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