The R Project SVN R

/*
 *  R : A Computer Language for Statistical Data Analysis
 *  Copyright (C) 1998, 1999  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 <Rconfig.h>
#endif

#include "Defn.h"
#include "Mathlib.h"
#include "Graphics.h"

static SEXP gcall;
int   X11DeviceDriver(DevDesc *, char *, double, double, double);

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

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(sxp)[offset])) + 1, sizeof(char));
    strcpy(s, CHAR(STRING(sxp)[offset]));
    return s;
}

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

/*  X11 Device Driver Parameters:
 *  -----------------       --> ../unix/devX11.c
 *  display = display
 *  width   = width in inches
 *  height  = height in inches
 *  ps      = pointsize
 */
SEXP do_devga(SEXP call, SEXP op, SEXP args, SEXP env)
{
    DevDesc *dd;
    char *display, *vmax;
    double height, width, ps;

    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);
    /* 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);
    if (!X11DeviceDriver(dd, display, width, height, ps)) {
    free(dd);
    errorcall(call, "unable to start device devga");
    }
    gsetVar(install(".Device"),
        mkString(display[0] ? display : "windows"), R_NilValue);
    addDevice(dd);
    initDisplayList(dd);
    vmaxset(vmax);
    return R_NilValue;
}