/*******************************************************************************  Copyright (C) 1998-2001  Ljubomir Milanovic & Horst Wagner**  This file is part of the g2 library****  This library is free software; you can redistribute it and/or**  modify it under the terms of the GNU Lesser General Public**  License as published by the Free Software Foundation; either**  version 2.1 of the License, or (at your option) any later version.****  This library 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**  Lesser General Public License for more details.****  You should have received a copy of the GNU Lesser General Public**  License along with this library; if not, write to the Free Software**  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA******************************************************************************/#include <stdio.h>#include "g2.h"#include "g2_device.h"#include "g2_virtual_device.h"#include "g2_util.h"/** * \ingroup interface * \defgroup vd virtual device related functions * * Virtual device is a method to redirect g2 output to multiple devices. Here is an example: * * \code *    int d1 = g2_open_X11(100, 100);      create first X11 window *    int d2 = g2_open_X11(100, 100);      create 2nd X11 window * *    int vd = g2_open_vd();               open a new virtual device * *    g2_attach(vd, d1);                   attach d1 (1st window) to virtual device *    g2_attach(vd, d2);                   attach d2 (2nd window) to virtual device * *    g2_plot(d1, 11, 11);                 output to the 1st X11 window *    g2_plot(d2, 12, 12);                 output to the 2nd X11 window  *    g2_plot(vd, 13, 13);                 output to both X11 windows * \endcode * *//** * * Create a new virtual device. * * \return virtual device ID * * \ingroup vd */int g2_open_vd(void){    int dix;    dix=g2_register_virtual_device();    __g2_last_device=dix;    return dix;}/** * Attach a device to virtual device \a vd_dev. * * \param vd_dev virtual device (create virtual device by calling g2_open_vd() ) *燶param dev device * * \ingroup vd */void g2_attach(int vd_dev, int dev){    g2_device *vd_devp, *devp;    if((vd_devp=g2_get_device_pointer(vd_dev))==NULL) {	fprintf(stderr, "g2_attach: No such device: %d\n", vd_dev);	return;    }    if((devp=g2_get_device_pointer(dev))==NULL) {	fprintf(stderr, "g2_attach: No such device: %d\n", dev);	return;    }    if(vd_devp->t!=g2_VD) {	fprintf(stderr, "g2_attach: Device %d is not virtual.\n", vd_dev);	return;    }    if(devp->t==g2_VD)				  /* if virtual device */	if(g2_is_attached(dev, vd_dev)) {	  /* check recurency */	    fprintf(stderr,		    "g2_attach: Device %d is already attached to %d.\n",		    dev, vd_dev);	    return;	}    vd_devp->d.vd->N++;    vd_devp->d.vd->dix=g2_realloc(vd_devp->d.vd->dix,				  vd_devp->d.vd->N*sizeof(int));    vd_devp->d.vd->dix[vd_devp->d.vd->N-1]=dev;    __g2_last_device=vd_dev;}/** * * Dettach a device from the virtual device \a vd_dev. * * \param vd_dev virtual device *燶param dev device * * \ingroup vd */void g2_detach(int vd_dev, int dev){    g2_device *vd_devp;    int i;    if((vd_devp=g2_get_device_pointer(vd_dev))==NULL) {	fprintf(stderr, "g2_detach: No such device: %d\n", vd_dev);	return;    }    if(vd_devp->t!=g2_VD) {	fprintf(stderr, "g2_detach: Device %d is not virtual.\n", vd_dev);	return;    }    for(i=0;i<vd_devp->d.vd->N;i++)	if(vd_devp->d.vd->dix[i]==dev) {	    if(vd_devp->d.vd->N>1)		vd_devp->d.vd->dix[i]=vd_devp->d.vd->dix[vd_devp->d.vd->N-1];	    vd_devp->d.vd->N--;	    if(vd_devp->d.vd->N!=0)		vd_devp->d.vd->dix=g2_realloc(vd_devp->d.vd->dix,					      vd_devp->d.vd->N*sizeof(int));	    return;	}    __g2_last_device=vd_dev;}