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flightgear/src/Instrumentation/HUD/HUD_scale.cxx

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2006-07-04 15:32:55 +00:00
// HUD_scale.cxx -- HUD Common Scale Base (inherited from Gauge/Tape/Dial)
//
// Written by Michele America, started September 1997.
//
// Copyright (C) 1997 Michele F. America [micheleamerica#geocities:com]
// Copyright (C) 2006 Melchior FRANZ [mfranz#aon:at]
//
// 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, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#include "HUD.hxx"
HUD::Scale::Scale( HUD *hud, const SGPropertyNode *n, float x, float y) :
Item(hud, n, x, y),
_input(n->getNode("input", false)),
_major_divs(n->getFloatValue("major-divisions")),
_minor_divs(n->getFloatValue("minor-divisions")),
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_modulo(n->getIntValue("modulo"))
{
if (n->hasValue("display-span"))
_range_shown = n->getFloatValue("display-span");
else
_range_shown = _input.max() - _input.min();
_display_factor = get_span() / _range_shown;
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if (_range_shown < 0)
_range_shown = -_range_shown;
}