freewrlinputdeviceapp.cpp

FreeWRLduneInputDevice和FreeWRL一起可以让用户用带有6DoF的输入设备检索3D VRML/X3D数据。它基于FreeWRL的"/tmp/inpdev"扩展传感器输入接口和w

/*
 * FreeWRLinputDeviceApp.cpp
 * used for a input device driver for FreeWRL,
 * Copyright (c) 2003 J. "MUFTI" Scheurich, based on
 *
 * DuneApp.cpp
 *
 * Copyright (C) 1999 Stephen F. White
 * 
 * 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 (see the file "COPYING" for details); if 
 * not, write to the Free Software Foundation, Inc., 675 Mass Ave, 
 * Cambridge, MA 02139, USA.
 */

#include <errno.h>
#include "FreeWRLinputDeviceApp.h"
#include "xerrorhandler.h"

FreeWRLinputDeviceApp *TheApp = NULL;

void returntracker(void)
   {
   TheApp->ReturnTracker();
   }

FreeWRLinputDeviceApp::FreeWRLinputDeviceApp()
{
    TheApp = this;
#ifndef _WIN32
    init_handlers();
#endif
    _maxNumberAxes=0;
}

// sort inputdevices
//
// make inputdevices without readdelay comes first in array
//
// so inputdevices with a readdelay can prepare the read, 
// while other inputdevices can use the time to read data

void
FreeWRLinputDeviceApp::sortInputDevices(void)
{
    // only a few devices, it is ok to use bubblesort 
    bool changedflag=false;
    do {
       InputDevice* tmp;
       changedflag=false;
       for (int i=0;i<_inputDevices.size()-1;i++)
          if (!_inputDevices[i]->hasReadDelay() && 
               _inputDevices[i+1]->hasReadDelay()) {
             tmp=_inputDevices[i];
             _inputDevices[i]=_inputDevices[i+1];
             _inputDevices[i+1]=tmp;
             changedflag=true;
          }
    } while (changedflag==true);
}