jsclient.cxx

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// jsclient.cxx -- simple UDP networked joystick client
//
// Copyright (C) 2003 by Manuel Bessler and Stephen Lowry
//
// based on joyclient.cxx by Curtis Olson
// Copyright (C) 2000  Curtis L. Olson - http://www.flightgear.org/~curt
//
// 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.
//
// $Id$
 
#ifdef HAVE_CONFIG_H
#  include "config.h"
#endif
 
#include <simgear/debug/logstream.hxx>
#include <simgear/io/iochannel.hxx>
#include <simgear/misc/stdint.hxx>
 
#include <Main/fg_props.hxx>
 
#include "jsclient.hxx"
 
 
FGJsClient::FGJsClient() {
        active = fgHasNode("/jsclient"); // if exist, assume bindings are defined
        SG_LOG( SG_IO, SG_INFO, "/jsclient exists, activating JsClient remote joystick support");
 
        for( int i = 0; i < 4; ++i )
        {
            axisdef[i] = fgGetNode("/jsclient/axis", i);
            if( axisdef[i] != NULL )
            {
                    axisdefstr[i] = axisdef[i]->getStringValue();
                    SG_LOG( SG_IO, SG_INFO, "jsclient axis[" << i << "] mapped to property " << axisdefstr[i]);
            }
            else
                axisdefstr[i] = "";
        }
}
 
FGJsClient::~FGJsClient() {
}
 
 
// open hailing frequencies
bool FGJsClient::open() {
    if ( is_enabled() ) {
        SG_LOG( SG_IO, SG_ALERT, "This shouldn't happen, but the channel " 
                << "is already in use, ignoring" );
        return false;
    }
 
    SGIOChannel *io = get_io_channel();
 
    if ( ! io->open( get_direction() ) ) {
        SG_LOG( SG_IO, SG_ALERT, "Error opening channel communication layer." );
        return false;
    }
 
    set_enabled( true );
 
    return true;
}
 
 
// process work for this port
bool FGJsClient::process() {
    SGIOChannel *io = get_io_channel();
    int length = 4+4+4+4+4+4;
 
//    if( ! active )
//          return true;
    if ( get_direction() == SG_IO_OUT ) {
        SG_LOG( SG_IO, SG_ALERT, "JsClient protocol is read only" );
        return false;
    } else if ( get_direction() == SG_IO_IN ) {
        SG_LOG( SG_IO, SG_DEBUG, "Searching for data." );
        if ( io->get_type() == sgFileType ) {
            if ( io->read( (char *)(& buf), length ) == length ) {
                SG_LOG( SG_IO, SG_DEBUG, "Success reading data." );
                int32_t *msg = (int32_t *)buf;
                for( int i = 0; i < 4; ++i )
                {
                        axis[i] = ((double)msg[i] / 2147483647.0);
                        if ( fabs(axis[i]) < 0.05 )
                            axis[i] = 0.0;
                        if( axisdefstr[i].length() != 0 )
                            fgSetFloat(axisdefstr[i].c_str(), axis[i]);
                }
            }
        } else {
            while ( io->read( (char *)(& buf), length ) == length ) {
                SG_LOG( SG_IO, SG_DEBUG, "Success reading data." );
                int32_t *msg = (int32_t *)buf;
                SG_LOG( SG_IO, SG_DEBUG, "ax0 = " << msg[0] << " ax1 = "
                        << msg[1] << "ax2 = " << msg[2] << "ax3 = " << msg[3]);
                for( int i = 0; i < 4; ++i )
                {
                        axis[i] = ((double)msg[i] / 2147483647.0);
                        if ( fabs(axis[i]) < 0.05 )
                            axis[i] = 0.0;
                        if( axisdefstr[i].length() != 0 )
                            fgSetFloat(axisdefstr[i].c_str(), axis[i]);
                }
            }
        }
    }
 
    return true;
}
 
 
// close the channel
bool FGJsClient::close() {
    SGIOChannel *io = get_io_channel();
 
    set_enabled( false );
 
    if ( ! io->close() ) {
        return false;
    }
 
    return true;
}