analogcomponent.cxx

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// analogcomponent.cxx - Base class for analog autopilot components
//
// Written by Torsten Dreyer
// Based heavily on work created by Curtis Olson, started January 2004.
//
// Copyright (C) 2004  Curtis L. Olson  - http://www.flightgear.org/~curt
// Copyright (C) 2010  Torsten Dreyer - Torsten (at) t3r (dot) de
//
// 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 "analogcomponent.hxx"
#include <Main/fg_props.hxx>
 
#include <simgear/misc/strutils.hxx>
 
using namespace FGXMLAutopilot;
 
AnalogComponent::AnalogComponent() :
  Component(),
  _feedback_if_disabled(false),
  _passive_mode( fgGetNode("/autopilot/locks/passive-mode", true) )
{
}
 
double AnalogComponent::clamp( double value ) const
{
    //If this is a periodical value, normalize it into our domain 
    // before clamping
    if( _periodical )
      value = _periodical->normalize( value );
 
    // clamp, if either min or max is defined
    if( _minInput.size() + _maxInput.size() > 0 ) {
        double d = _maxInput.get_value();
        if( value > d ) value = d;
        d = _minInput.get_value();
        if( value < d ) value = d;
    }
    return value;
}
 
bool AnalogComponent::configure( SGPropertyNode& cfg_node,
                                 const std::string& cfg_name,
                                 SGPropertyNode& prop_root )
{
  if( cfg_name == "feedback-if-disabled" )
  {
    _feedback_if_disabled = cfg_node.getBoolValue();
    return true;
  } 
 
  if( cfg_name == "output" )
  {
    // grab all <prop> and <property> childs.
    bool found = false;
    for( int i = 0; i < cfg_node.nChildren(); ++i )
    {
      SGPropertyNode* child = cfg_node.getChild(i);
      const std::string& name = child->getNameString();
 
      // Allow "prop" for backwards compatiblity
      if( name != "property" && name != "prop" )
        continue;
 
      const auto trimmed = simgear::strutils::strip(child->getStringValue());
      _output_list.push_back( prop_root.getNode(trimmed, true) );
      found = true;
    }
 
    // no <prop> elements, text node of <output> is property name
      if( !found ) {
          const auto trimmed = simgear::strutils::strip(cfg_node.getStringValue());
          _output_list.push_back(prop_root.getNode(trimmed, true));
      }
 
    return true;
  }
 
  if( cfg_name == "input" )
  {
    _valueInput.push_back(new simgear::Value(prop_root, cfg_node));
    return true;
  }
 
  if( cfg_name == "reference" )
  {
    _referenceInput.push_back(new simgear::Value(prop_root, cfg_node));
    return true;
  }
 
  if( cfg_name == "min" || cfg_name == "u_min" )
  {
    _minInput.push_back(new simgear::Value(prop_root, cfg_node));
    return true;
  }
 
  if( cfg_name == "max" || cfg_name == "u_max" )
  {
    _maxInput.push_back(new simgear::Value(prop_root, cfg_node));
    return true;
  }
 
  if( cfg_name == "period" )
  {
    _periodical = new simgear::PeriodicalValue(prop_root, cfg_node);
    return true;
  }
 
  return Component::configure(cfg_node, cfg_name, prop_root);
}
 
void AnalogComponent::collectDependentProperties(std::set<const SGPropertyNode*>& props) const
{
    _valueInput.collectDependentProperties(props);
    _referenceInput.collectDependentProperties(props);
    _minInput.collectDependentProperties(props);
    _maxInput.collectDependentProperties(props);
}