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/****************************************************************************
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 *   Copyright (C) 2009-2010 by Claas Anders "CaScAdE" Rathje               *
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 *   admiralcascade@gmail.com                                               *
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 *   Project-URL: http://www.mylifesucks.de/oss/c-osd/                      *
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 *                                                                          *
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 *   This program is free software; you can redistribute it and/or modify   *
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 *   it under the terms of the GNU General Public License as published by   *
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 *   the Free Software Foundation; either version 2 of the License.         *
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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, write to the                          *
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 *   Free Software Foundation, Inc.,                                        *
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 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.              *
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 ****************************************************************************/
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/* ##########################################################################
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 * compass stuff
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 * ##########################################################################*/
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/**
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 * convert the <heading> gotton from NC into an index
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 */
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uint8_t heading_conv(uint16_t);
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/**
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 * convert the <heading> gotton from NC into a more
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 * precise index
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 */
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uint8_t heading_fine_conv(uint16_t );
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/**
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 * draw a compass rose at <x>/<y> for <heading>
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 */
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void draw_compass(uint8_t, uint8_t, uint16_t);
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/* ##########################################################################
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 * battery index
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 * ##########################################################################*/
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/**
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 * draw a battery symbol at <x>/<y> according to <voltage>
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 */
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void draw_battery(uint8_t, uint8_t, uint8_t, uint8_t, uint8_t);
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/* ##########################################################################
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 * variometer
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 * ##########################################################################*/
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/**
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 * draw variometer arrows at <x>/<y> according to <variometer>
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 */
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void draw_variometer(uint8_t, uint8_t, int16_t);
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/**
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 * draw a bigger vario with middle at <x>/<y> acording to <variometer>
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 */
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void draw_big_variometer(uint8_t, uint8_t, int16_t);
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/* ##########################################################################
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 * artificial horizon
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 * ##########################################################################*/
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/**
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 * draw roll und nick indicators (could be enhanced to full artificial horizon)
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 * from line <firstline> to <listlines> for given <nick> and <roll> values
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 */
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void draw_artificial_horizon(uint8_t, uint8_t, int16_t, int16_t);