54 lines
1.4 KiB
C++
54 lines
1.4 KiB
C++
// slip_skid_ball.cxx - an electric-powered turn indicator.
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// Written by David Megginson, started 2003.
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//
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// This file is in the Public Domain and comes with no warranty.
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include "slip_skid_ball.hxx"
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#include <Main/fg_props.hxx>
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#include <Main/util.hxx>
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using std::string;
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SlipSkidBall::SlipSkidBall ( SGPropertyNode *node)
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:
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_name(node->getStringValue("name", "slip-skid-ball")),
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_num(node->getIntValue("number", 0))
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{
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}
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SlipSkidBall::~SlipSkidBall ()
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{
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}
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void
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SlipSkidBall::init ()
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{
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string branch;
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branch = "/instrumentation/" + _name;
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SGPropertyNode *node = fgGetNode(branch.c_str(), _num, true );
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_serviceable_node = node->getChild("serviceable", 0, true);
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_y_accel_node = fgGetNode("/accelerations/pilot/y-accel-fps_sec", true);
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_z_accel_node = fgGetNode("/accelerations/pilot/z-accel-fps_sec", true);
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_out_node = node->getChild("indicated-slip-skid", 0, true);
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_override_node = node->getChild("override", 0, true);
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}
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void
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SlipSkidBall::update (double delta_time_sec)
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{
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if (_serviceable_node->getBoolValue() && !_override_node->getBoolValue()) {
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double d = -_z_accel_node->getDoubleValue();
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if (d < 1.0)
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d = 1.0;
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double pos = _y_accel_node->getDoubleValue() / d * 10.0;
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pos = fgGetLowPass(_out_node->getDoubleValue(), pos, delta_time_sec);
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_out_node->setDoubleValue(pos);
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}
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}
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// end of slip_skid_ball.cxx
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