76 lines
2.2 KiB
C++
76 lines
2.2 KiB
C++
// attitude_indicator.cxx - a vacuum-powered attitude indicator.
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// Written by David Megginson, started 2002.
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//
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// This file is in the Public Domain and comes with no warranty.
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#include "attitude_indicator.hxx"
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#include <Main/fg_props.hxx>
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AttitudeIndicator::AttitudeIndicator ()
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{
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}
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AttitudeIndicator::~AttitudeIndicator ()
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{
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}
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void
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AttitudeIndicator::init ()
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{
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// TODO: allow index of pump and AI
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// to be configured.
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_serviceable_node =
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fgGetNode("/instrumentation/attitude-indicator/serviceable", true);
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_pitch_in_node = fgGetNode("/orientation/pitch-deg", true);
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_roll_in_node = fgGetNode("/orientation/roll-deg", true);
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_suction_node = fgGetNode("/systems/vacuum[0]/suction-inhg", true);
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_pitch_out_node =
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fgGetNode("/instrumentation/attitude-indicator/indicated-pitch-deg",
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true);
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_roll_out_node =
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fgGetNode("/instrumentation/attitude-indicator/indicated-roll-deg",
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true);
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}
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void
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AttitudeIndicator::bind ()
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{
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}
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void
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AttitudeIndicator::unbind ()
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{
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}
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void
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AttitudeIndicator::update (double dt)
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{
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// First, calculate the bogo-spin from 0 to 1.
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// All numbers are made up.
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_spin -= 0.01 * dt; // spin decays every 1% every second.
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// spin increases up to 10% every second
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// if suction is available and the gauge
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// is serviceable.
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if (_serviceable_node->getBoolValue()) {
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double suction = _suction_node->getDoubleValue();
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double step = 0.10 * (suction / 5.0) * dt;
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if ((_spin + step) <= (suction / 5.0))
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_spin += step;
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}
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// Next, calculate the indicated roll
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// and pitch, introducing errors if
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// the spin is less than 0.8 (80%).
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double roll = _roll_in_node->getDoubleValue();
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double pitch = _pitch_in_node->getDoubleValue();
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if (_spin < 0.8) {
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// TODO
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}
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_roll_out_node->setDoubleValue(roll);
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_pitch_out_node->setDoubleValue(pitch);
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}
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// end of attitude_indicator.cxx
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