The R Project SVN R

/*
 *  R : A Computer Language for Statistical Data Analysis
 *  Copyright (C) 1998-2001  Guido Masarotto and Brian Ripley
 *
 *  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <Defn.h>
#include <Graphics.h>
#include <Rdevices.h>
#include "devga.h"

/* Return a non-relocatable copy of a string */

static SEXP gcall;

static char *SaveString(SEXP sxp, int offset)
{
    char *s;

    if (!isString(sxp) || length(sxp) <= offset)
    errorcall(gcall, "invalid string argument");
    s = R_alloc(strlen(CHAR(STRING_ELT(sxp, offset))) + 1, sizeof(char));
    strcpy(s, CHAR(STRING_ELT(sxp, offset)));
    return s;
}

/* This is Guido's devga device. */

SEXP do_devga(SEXP call, SEXP op, SEXP args, SEXP env)
{
    DevDesc *dd;
    char *display, *vmax;
    double height, width, ps, xpinch, ypinch;
    int recording = 0, resize = 1;

    gcall = call;
    vmax = vmaxget();
    display = SaveString(CAR(args), 0);
    args = CDR(args);
    width = asReal(CAR(args));
    args = CDR(args);
    height = asReal(CAR(args));
    args = CDR(args);
    if (width <= 0 || height <= 0)
    errorcall(call, "invalid width or height");
    ps = asReal(CAR(args));
    args = CDR(args);
    recording = asLogical(CAR(args));
    if (recording == NA_LOGICAL)
    errorcall(call, "invalid value of `recording'");
    args = CDR(args);
    resize = asInteger(CAR(args));
    if (resize == NA_INTEGER)
    errorcall(call, "invalid value of `resize'");
    args = CDR(args);
    xpinch = asReal(CAR(args));
    args = CDR(args);
    ypinch = asReal(CAR(args));

    R_CheckDeviceAvailable();
    BEGIN_SUSPEND_INTERRUPTS {
    /* Allocate and initialize the device driver data */
    if (!(dd = (DevDesc *) malloc(sizeof(DevDesc))))
        return 0;
    /* Do this for early redraw attempts */
    dd->displayList = R_NilValue;
    GInit(&dd->dp);
    GAsetunits(xpinch, ypinch);
    if (!GADeviceDriver(dd, display, width, height, ps, 
                (Rboolean)recording, resize)) {
        free(dd);
        errorcall(call, "unable to start device devga");
    }
    gsetVar(install(".Device"),
        mkString(display[0] ? display : "windows"), R_NilValue);
    addDevice(dd);
    initDisplayList(dd);
    } END_SUSPEND_INTERRUPTS;
    vmaxset(vmax);
    return R_NilValue;
}