g_canvas.c 75.3 KB
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/* Copyright (c) 1997-2001 Miller Puckette and others.
* For information on usage and redistribution, and for a DISCLAIMER OF ALL
* WARRANTIES, see the file, "LICENSE.txt," in this distribution.  */

/* this file defines the "glist" class, also known as "canvas" (the two used
to be different but are now unified except for some fossilized names.) */

#include <stdlib.h>
#include <stdio.h>
#include "m_pd.h"
#include "m_imp.h"
#include "s_stuff.h"
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#include "g_magicglass.h"
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#include "g_canvas.h"
#include "g_all_guis.h"
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#include <string.h>

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extern int do_not_redraw;
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extern void canvas_drawconnection(t_canvas *x, int lx1, int ly1, int lx2, int ly2, t_int tag, int issignal);
extern void canvas_updateconnection(t_canvas *x, int lx1, int ly1, int lx2, int ly2, t_int tag);
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    /* LATER consider adding font size to this struct (see glist_getfont()) */
struct _canvasenvironment
{
    t_symbol *ce_dir;      /* directory patch lives in */
    int ce_argc;           /* number of "$" arguments */
    t_atom *ce_argv;       /* array of "$" arguments */
    int ce_dollarzero;     /* value of "$0" */
    t_namelist *ce_path;   /* search path */
};

#define GLIST_DEFCANVASWIDTH 450
#define GLIST_DEFCANVASHEIGHT 300

#ifdef __APPLE__
#define GLIST_DEFCANVASYLOC 22
#else
#define GLIST_DEFCANVASYLOC 0
#endif

/* ---------------------- variables --------------------------- */

extern t_pd *newest;
t_class *canvas_class;
int canvas_dspstate;                /* whether DSP is on or off */  
t_canvas *canvas_editing;           /* last canvas to start text edting */ 
t_canvas *canvas_whichfind;         /* last canvas we did a find in */ 
t_canvas *canvas_list;              /* list of all root canvases */

/* ------------------ forward function declarations --------------- */
static void canvas_start_dsp(void);
static void canvas_stop_dsp(void);
static void canvas_drawlines(t_canvas *x);
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void canvas_setbounds(t_canvas *x, int x1, int y1, int x2, int y2);
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void canvas_reflecttitle(t_canvas *x);
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static void canvas_addtolist(t_canvas *x);
static void canvas_takeofflist(t_canvas *x);
static void canvas_pop(t_canvas *x, t_floatarg fvis);
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static int canvas_should_bind(t_canvas *x);
static void canvas_bind(t_canvas *x);
static void canvas_unbind(t_canvas *x);
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/* --------- functions to handle the canvas environment ----------- */

static t_symbol *canvas_newfilename = &s_;
static t_symbol *canvas_newdirectory = &s_;
static int canvas_newargc;
static t_atom *canvas_newargv;

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    /* maintain the list of visible toplevels for the GUI's "windows" menu */
void canvas_updatewindowlist( void)
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{
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    t_canvas *x;
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    if (glist_amreloadingabstractions)  /* not if we're in a reload */
        return;
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    gui_start_vmess("gui_set_toplevel_window_list", "s", "dummy");
    gui_start_array();
    for (x = canvas_list; x; x = x->gl_next)
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    {
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        if (!x->gl_owner)
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        {
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            /* this is a canvas; if we have a window, put on "windows" list */
            if (x->gl_havewindow)
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            {
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                gui_s(x->gl_name->s_name);
                gui_x((long unsigned int)x);
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            }
        }
    }
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    gui_end_array();
    gui_end_vmess();
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}

    /* add a glist the list of "root" canvases (toplevels without parents.) */
static void canvas_addtolist(t_canvas *x)
{
    x->gl_next = canvas_list;
    canvas_list = x;
}

static void canvas_takeofflist(t_canvas *x)
{
        /* take it off the window list */
    if (x == canvas_list) canvas_list = x->gl_next;
    else
    {
        t_canvas *z;
        for (z = canvas_list; z->gl_next != x; z = z->gl_next)
            ;
        z->gl_next = x->gl_next;
    }
}


void canvas_setargs(int argc, t_atom *argv)
{
        /* if there's an old one lying around free it here.  This
        happens if an abstraction is loaded but never gets as far
        as calling canvas_new(). */
    if (canvas_newargv)
        freebytes(canvas_newargv, canvas_newargc * sizeof(t_atom));
    canvas_newargc = argc;
    canvas_newargv = copybytes(argv, argc * sizeof(t_atom));
}

void glob_setfilename(void *dummy, t_symbol *filesym, t_symbol *dirsym)
{
    canvas_newfilename = filesym;
    canvas_newdirectory = dirsym;
}

t_canvas *canvas_getcurrent(void)
{
    return ((t_canvas *)pd_findbyclass(&s__X, canvas_class));
}

void canvas_setcurrent(t_canvas *x)
{
    pd_pushsym(&x->gl_pd);
}

void canvas_unsetcurrent(t_canvas *x)
{
    pd_popsym(&x->gl_pd);
}

t_canvasenvironment *canvas_getenv(t_canvas *x)
{
    if (!x) bug("canvas_getenv");
    while (!x->gl_env)
        if (!(x = x->gl_owner))
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            bug("t_canvasenvironment");
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    return (x->gl_env);
}

int canvas_getdollarzero( void)
{
    t_canvas *x = canvas_getcurrent();
    t_canvasenvironment *env = (x ? canvas_getenv(x) : 0);
    if (env)
        return (env->ce_dollarzero);
    else return (0);
}

void canvas_getargs(int *argcp, t_atom **argvp)
{
    t_canvasenvironment *e = canvas_getenv(canvas_getcurrent());
    *argcp = e->ce_argc;
    *argvp = e->ce_argv;
}

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void canvas_getargs_after_creation(t_canvas *c, int *argcp, t_atom **argvp)
{
    t_canvasenvironment *e = canvas_getenv(c);
    *argcp = e->ce_argc;
    *argvp = e->ce_argv;
}

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t_symbol *canvas_realizedollar(t_canvas *x, t_symbol *s)
{
    t_symbol *ret;
    char *name = s->s_name;
    if (strchr(name, '$'))
    {
        t_canvasenvironment *env = canvas_getenv(x);
        canvas_setcurrent(x);
        ret = binbuf_realizedollsym(s, env->ce_argc, env->ce_argv, 1);
        canvas_unsetcurrent(x);
    }
    else ret = s;
    return (ret);
}

t_symbol *canvas_getcurrentdir(void)
{
    t_canvasenvironment *e = canvas_getenv(canvas_getcurrent());
    return (e->ce_dir);
}

t_symbol *canvas_getdir(t_canvas *x)
{
    t_canvasenvironment *e = canvas_getenv(x);
    return (e->ce_dir);
}

void canvas_makefilename(t_canvas *x, char *file, char *result, int resultsize)
{
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    char interim[FILENAME_MAX];
    sys_expandpathelems(file, interim);
    //fprintf(stderr,"interim = <%s>\n", interim);
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    char *dir = canvas_getenv(x)->ce_dir->s_name;
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    if (interim[0] == '/' || (interim[0] && interim[1] == ':') || !*dir)
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    {
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        //fprintf(stderr,"root file\n");
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        strncpy(result, interim, resultsize);
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        result[resultsize-1] = 0;
    }
    else
    {
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        //fprintf(stderr,"relative file\n");
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        int nleft;
        strncpy(result, dir, resultsize);
        result[resultsize-1] = 0;
        nleft = resultsize - strlen(result) - 1;
        if (nleft <= 0) return;
        strcat(result, "/");
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        strncat(result, interim, nleft);
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        result[resultsize-1] = 0;
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    } 
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    //fprintf(stderr,"resulting file = <%s>\n", result);          
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}

void canvas_rename(t_canvas *x, t_symbol *s, t_symbol *dir)
{
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    canvas_unbind(x);
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    x->gl_name = s;
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    canvas_bind(x);
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    if (dir && dir != &s_)
    {
        t_canvasenvironment *e = canvas_getenv(x);
        e->ce_dir = dir;
    }
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    if (glist_isvisible(x))
        if (x->gl_havewindow) //was glist_isvisible(x)
            canvas_reflecttitle(x);
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}

/* --------------- traversing the set of lines in a canvas ----------- */

int canvas_getindex(t_canvas *x, t_gobj *y)
{
    t_gobj *y2;
    int indexno;
    for (indexno = 0, y2 = x->gl_list; y2 && y2 != y; y2 = y2->g_next)
        indexno++;
    return (indexno);
}

void linetraverser_start(t_linetraverser *t, t_canvas *x)
{
    t->tr_ob = 0;
    t->tr_x = x;
    t->tr_nextoc = 0;
    t->tr_nextoutno = t->tr_nout = 0;
}

t_outconnect *linetraverser_next(t_linetraverser *t)
{
    t_outconnect *rval = t->tr_nextoc;
    int outno;
    while (!rval)
    {
        outno = t->tr_nextoutno;
        while (outno == t->tr_nout)
        {
            t_gobj *y;
            t_object *ob = 0;
            if (!t->tr_ob) y = t->tr_x->gl_list;
            else y = t->tr_ob->ob_g.g_next;
            for (; y; y = y->g_next)
                if (ob = pd_checkobject(&y->g_pd)) break;
            if (!ob) return (0);
            t->tr_ob = ob;
            t->tr_nout = obj_noutlets(ob);
            outno = 0;
            if (glist_isvisible(t->tr_x))
                gobj_getrect(y, t->tr_x,
                    &t->tr_x11, &t->tr_y11, &t->tr_x12, &t->tr_y12);
            else t->tr_x11 = t->tr_y11 = t->tr_x12 = t->tr_y12 = 0;
        }
        t->tr_nextoutno = outno + 1;
        rval = obj_starttraverseoutlet(t->tr_ob, &t->tr_outlet, outno);
        t->tr_outno = outno;
    }
    t->tr_nextoc = obj_nexttraverseoutlet(rval, &t->tr_ob2,
        &t->tr_inlet, &t->tr_inno);
    t->tr_nin = obj_ninlets(t->tr_ob2);
    if (!t->tr_nin) bug("drawline");
    if (glist_isvisible(t->tr_x))
    {
        int inplus = (t->tr_nin == 1 ? 1 : t->tr_nin - 1);
        int outplus = (t->tr_nout == 1 ? 1 : t->tr_nout - 1);
        gobj_getrect(&t->tr_ob2->ob_g, t->tr_x,
            &t->tr_x21, &t->tr_y21, &t->tr_x22, &t->tr_y22);
        t->tr_lx1 = t->tr_x11 +
            ((t->tr_x12 - t->tr_x11 - IOWIDTH) * t->tr_outno) /
                outplus + IOMIDDLE;
        t->tr_ly1 = t->tr_y12;
        t->tr_lx2 = t->tr_x21 +
            ((t->tr_x22 - t->tr_x21 - IOWIDTH) * t->tr_inno)/inplus +
                IOMIDDLE;
        t->tr_ly2 = t->tr_y21;
    }
    else
    {
        t->tr_x21 = t->tr_y21 = t->tr_x22 = t->tr_y22 = 0;
        t->tr_lx1 = t->tr_ly1 = t->tr_lx2 = t->tr_ly2 = 0;
    }
    return (rval);
}

void linetraverser_skipobject(t_linetraverser *t)
{
    t->tr_nextoc = 0;
    t->tr_nextoutno = t->tr_nout;
}

/* -------------------- the canvas object -------------------------- */
int glist_valid = 10000;

void glist_init(t_glist *x)
{
        /* zero out everyone except "pd" field */
    memset(((char *)x) + sizeof(x->gl_pd), 0, sizeof(*x) - sizeof(x->gl_pd));
    x->gl_stub = gstub_new(x, 0);
    x->gl_valid = ++glist_valid;
    x->gl_xlabel = (t_symbol **)t_getbytes(0);
    x->gl_ylabel = (t_symbol **)t_getbytes(0);
}

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void canvasgop__clickhook(t_scalehandle *sh, int newstate);
void canvasgop__motionhook(t_scalehandle *sh,t_floatarg f1, t_floatarg f2);
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extern void glist_setlastxy(t_glist *gl, int xval, int yval);
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/* These globals are used to set state for the "canvas" field in a
   struct. We try below to make sure they only get set for the toplevel
   canvas, and then set them to NULL for everything else. */
t_symbol *canvas_field_templatesym; /* for "canvas" data type */
t_word *canvas_field_vec;           /* for "canvas" data type */
t_gpointer *canvas_field_gp;        /* parent for "canvas" data type */

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    /* make a new glist.  It will either be a "root" canvas or else
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    it appears as a "text" object in another window (canvas_getcurrent() 
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    tells us which.) */
t_canvas *canvas_new(void *dummy, t_symbol *sel, int argc, t_atom *argv)
{
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    /* DEBUG
    int d;
    for (d=0; d < argc; d++)
    {
        if (argv[d].a_type == A_FLOAT)
            fprintf(stderr, " %g ", argv[d].a_w.w_float);
        else fprintf(stderr, " %s ", argv[d].a_w.w_symbol->s_name);
    }
    fprintf(stderr,"\n");*/
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    t_canvas *x = (t_canvas *)pd_new(canvas_class);
    t_canvas *owner = canvas_getcurrent();
    t_symbol *s = &s_;
    int vis = 0, width = GLIST_DEFCANVASWIDTH, height = GLIST_DEFCANVASHEIGHT;
    int xloc = 0, yloc = GLIST_DEFCANVASYLOC;
    int font = (owner ? owner->gl_font : sys_defaultfont);
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    glist_init(x);
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    //x->gl_magic_glass = magicGlass_new(x);
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    x->gl_obj.te_type = T_OBJECT;
    if (!owner)
        canvas_addtolist(x);
    /* post("canvas %lx, owner %lx", x, owner); */

    if (argc == 5)  /* toplevel: x, y, w, h, font */
    {
        xloc = atom_getintarg(0, argc, argv);
        yloc = atom_getintarg(1, argc, argv);
        width = atom_getintarg(2, argc, argv);
        height = atom_getintarg(3, argc, argv);
        font = atom_getintarg(4, argc, argv);
    }
    else if (argc == 6)  /* subwindow: x, y, w, h, name, vis */
    {
        xloc = atom_getintarg(0, argc, argv);
        yloc = atom_getintarg(1, argc, argv);
        width = atom_getintarg(2, argc, argv);
        height = atom_getintarg(3, argc, argv);
        s = atom_getsymbolarg(4, argc, argv);
        vis = atom_getintarg(5, argc, argv);
    }
        /* (otherwise assume we're being created from the menu.) */

    if (canvas_newdirectory->s_name[0])
    {
        static int dollarzero = 1000;
        t_canvasenvironment *env = x->gl_env =
            (t_canvasenvironment *)getbytes(sizeof(*x->gl_env));
        if (!canvas_newargv)
            canvas_newargv = getbytes(0);
        env->ce_dir = canvas_newdirectory;
        env->ce_argc = canvas_newargc;
        env->ce_argv = canvas_newargv;
        env->ce_dollarzero = dollarzero++;
        env->ce_path = 0;
        canvas_newdirectory = &s_;
        canvas_newargc = 0;
        canvas_newargv = 0;
    }
    else x->gl_env = 0;

    if (yloc < GLIST_DEFCANVASYLOC)
        yloc = GLIST_DEFCANVASYLOC;
    if (xloc < 0)
        xloc = 0;
    x->gl_x1 = 0;
    x->gl_y1 = 0;
    x->gl_x2 = 1;
    x->gl_y2 = 1;
    canvas_setbounds(x, xloc, yloc, xloc + width, yloc + height);
    x->gl_owner = owner;
    x->gl_name = (*s->s_name ? s : 
        (canvas_newfilename ? canvas_newfilename : gensym("Pd")));
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    canvas_bind(x);
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    x->gl_loading = 1;
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    x->gl_unloading = 0;
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    //fprintf(stderr,"loading = 1 .x%lx owner=.x%lx\n", (t_int)x, (t_int)x->gl_owner);
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    x->gl_goprect = 0;      /* no GOP rectangle unless it's turned on later */
        /* cancel "vis" flag if we're a subpatch of an
         abstraction inside another patch.  A separate mechanism prevents
         the toplevel abstraction from showing up. */
    if (vis && gensym("#X")->s_thing && 
        ((*gensym("#X")->s_thing) == canvas_class))
    {
        t_canvas *zzz = (t_canvas *)(gensym("#X")->s_thing);
        while (zzz && !zzz->gl_env)
            zzz = zzz->gl_owner;
        if (zzz && canvas_isabstraction(zzz) && zzz->gl_owner)
            vis = 0;
    }
    x->gl_willvis = vis;
    x->gl_edit = !strncmp(x->gl_name->s_name, "Untitled", 8);
    x->gl_font = sys_nearestfontsize(font);
    pd_pushsym(&x->gl_pd);
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    //dpsaha@vt.edu gop resize (refactored by mathieu)
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    x-> x_handle = scalehandle_new((t_object *)x,x,1,canvasgop__clickhook,canvasgop__motionhook);
    x->x_mhandle = scalehandle_new((t_object *)x,x,0,canvasgop__clickhook,canvasgop__motionhook);
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    x->u_queue = canvas_undo_init(x);
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    //glist_setlastxy(x, 20, 20);
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    x->gl_templatesym = canvas_field_templatesym;
    x->gl_vec = canvas_field_vec;
    if (canvas_field_gp) gpointer_copy(canvas_field_gp, &x->gl_gp);

    // unset the globals in case this was a canvas field
    canvas_field_templatesym = NULL;
    canvas_field_vec = NULL;
    canvas_field_gp = NULL;

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    return(x);
}

void canvas_setgraph(t_glist *x, int flag, int nogoprect);

static void canvas_coords(t_glist *x, t_symbol *s, int argc, t_atom *argv)
{
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    //IB: first delete the graph in case we are downsizing the object size via script
    canvas_setgraph(x, 0, 0);
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    x->gl_x1 = atom_getfloatarg(0, argc, argv);
    x->gl_y1 = atom_getfloatarg(1, argc, argv);
    x->gl_x2 = atom_getfloatarg(2, argc, argv);
    x->gl_y2 = atom_getfloatarg(3, argc, argv);
    x->gl_pixwidth = atom_getintarg(4, argc, argv);
    x->gl_pixheight = atom_getintarg(5, argc, argv);
    if (argc <= 7)
        canvas_setgraph(x, atom_getintarg(6, argc, argv), 1);
    else
    {
        x->gl_xmargin = atom_getintarg(7, argc, argv);
        x->gl_ymargin = atom_getintarg(8, argc, argv);
        canvas_setgraph(x, atom_getintarg(6, argc, argv), 0);
    }
}

    /* make a new glist and add it to this glist.  It will appear as
    a "graph", not a text object.  */
t_glist *glist_addglist(t_glist *g, t_symbol *sym,
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    t_float x1, t_float y1, t_float x2, t_float y2,
    t_float px1, t_float py1, t_float px2, t_float py2)
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{
    static int gcount = 0;
    int zz;
    int menu = 0;
    char *str;
    t_glist *x = (t_glist *)pd_new(canvas_class);
    glist_init(x);
    x->gl_obj.te_type = T_OBJECT;
    if (!*sym->s_name)
    {
        char buf[40];
        sprintf(buf, "graph%d", ++gcount);
        sym = gensym(buf);
        menu = 1;
    }
    else if (!strncmp((str = sym->s_name), "graph", 5)
        && (zz = atoi(str + 5)) > gcount)
            gcount = zz;
        /* in 0.34 and earlier, the pixel rectangle and the y bounds were
        reversed; this would behave the same, except that the dialog window
        would be confusing.  The "correct" way is to have "py1" be the value
        that is higher on the screen. */
    if (py2 < py1)
    {
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        t_float zz;
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        zz = y2;
        y2 = y1;
        y1 = zz;
        zz = py2;
        py2 = py1;
        py1 = zz;
    }
    if (x1 == x2 || y1 == y2)
        x1 = 0, x2 = 100, y1 = 1, y2 = -1;
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    if (px1 != 0 && px2 == 0) px2 = px1 + GLIST_DEFGRAPHWIDTH;
    if (py1 != 0 && py2 == py1) py2 = py1 + GLIST_DEFGRAPHHEIGHT;
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    if (px1 >= px2 || py1 >= py2)
        px1 = 100, py1 = 20, px2 = 100 + GLIST_DEFGRAPHWIDTH,
            py2 = 20 + GLIST_DEFGRAPHHEIGHT;
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    x->gl_name = sym;
    x->gl_x1 = x1;
    x->gl_x2 = x2;
    x->gl_y1 = y1;
    x->gl_y2 = y2;
    x->gl_obj.te_xpix = px1;
    x->gl_obj.te_ypix = py1;
    x->gl_pixwidth = px2 - px1;
    x->gl_pixheight = py2 - py1;
    x->gl_font =  (canvas_getcurrent() ?
        canvas_getcurrent()->gl_font : sys_defaultfont);
    x->gl_screenx1 = x->gl_screeny1 = 0;
    x->gl_screenx2 = 450;
    x->gl_screeny2 = 300;
    x->gl_owner = g;
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    canvas_bind(x);
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    x->gl_isgraph = 1;
    x->gl_goprect = 0;
    x->gl_obj.te_binbuf = binbuf_new();
    binbuf_addv(x->gl_obj.te_binbuf, "s", gensym("graph"));
    if (!menu)
        pd_pushsym(&x->gl_pd);
    glist_add(g, &x->gl_gobj);
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    if (!do_not_redraw) scrollbar_update(glist_getcanvas(g));
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    //fprintf(stderr,"    ... %f %f\n", x->gl_x1, x->gl_x2);
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    return (x);
}

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extern int we_are_undoing;

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    /* call glist_addglist from a Pd message */
void glist_glist(t_glist *g, t_symbol *s, int argc, t_atom *argv)
{
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    if (canvas_hasarray(g)) return;
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    pd_vmess(&g->gl_pd, gensym("editmode"), "i", 1);
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    t_symbol *sym = atom_getsymbolarg(0, argc, argv);
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    /* if we wish to put a graph where the mouse is we need to replace bogus name */
    if (!strcmp(sym->s_name, "NULL")) sym = &s_;  
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    t_float x1 = atom_getfloatarg(1, argc, argv);  
    t_float y1 = atom_getfloatarg(2, argc, argv);  
    t_float x2 = atom_getfloatarg(3, argc, argv);  
    t_float y2 = atom_getfloatarg(4, argc, argv);  
    t_float px1 = atom_getfloatarg(5, argc, argv);  
    t_float py1 = atom_getfloatarg(6, argc, argv);  
    t_float px2 = atom_getfloatarg(7, argc, argv);  
    t_float py2 = atom_getfloatarg(8, argc, argv);
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    glist_addglist(g, sym, x1, y1, x2, y2, px1, py1, px2, py2);
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    if (!we_are_undoing)
        canvas_undo_add(glist_getcanvas(g), 9, "create",
            (void *)canvas_undo_set_create(glist_getcanvas(g)));
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}

    /* return true if the glist should appear as a graph on parent;
    otherwise it appears as a text box. */
int glist_isgraph(t_glist *x)
{
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    // testing to see if we have an array and force hiding text (later update GUI accordingly)
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    // we likely need this to silently update legacy arrays
    // (no regressions are expected but this needs to be tested)
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    t_gobj *g = x->gl_list;
    int hasarray = 0;
    while (g) {
        if (pd_class(&g->g_pd) == garray_class) hasarray = 1;
        g = g->g_next;
    }
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    if (hasarray)  {
        x->gl_isgraph = 1;
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        x->gl_hidetext = 1;
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    }
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    return (x->gl_isgraph|(x->gl_hidetext<<1));
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}

    /* This is sent from the GUI to inform a toplevel that its window has been
    moved or resized. */
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void canvas_setbounds(t_canvas *x, int x1, int y1, int x2, int y2)
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{
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    //fprintf(stderr,"canvas_setbounds %d %d %d %d\n", x1, y1, x2, y2);
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    int heightwas = y2 - y1;
    int heightchange = y2 - y1 - (x->gl_screeny2 - x->gl_screeny1);
    if (x->gl_screenx1 == x1 && x->gl_screeny1 == y1 &&
        x->gl_screenx2 == x2 && x->gl_screeny2 == y2)
            return;
    x->gl_screenx1 = x1;
    x->gl_screeny1 = y1;
    x->gl_screenx2 = x2;
    x->gl_screeny2 = y2;
    if (!glist_isgraph(x) && (x->gl_y2 < x->gl_y1)) 
    {
            /* if it's flipped so that y grows upward,
            fix so that zero is bottom edge and redraw.  This is
            only appropriate if we're a regular "text" object on the
            parent. */
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        t_float diff = x->gl_y1 - x->gl_y2;
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        t_gobj *y;
        x->gl_y1 = heightwas * diff;
        x->gl_y2 = x->gl_y1 - diff;
            /* and move text objects accordingly; they should stick
            to the bottom, not the top. */
        for (y = x->gl_list; y; y = y->g_next)
            if (pd_checkobject(&y->g_pd))
                gobj_displace(y, x, 0, heightchange);
        canvas_redraw(x);
    }
}

t_symbol *canvas_makebindsym(t_symbol *s)
{
    char buf[MAXPDSTRING];
    strcpy(buf, "pd-");
    strcat(buf, s->s_name);
    return (gensym(buf));
}

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void canvas_args_to_string(char *namebuf, t_canvas *x)
{
    t_canvasenvironment *env = canvas_getenv(x);
    if (env->ce_argc)
    {
        int i;
        strcpy(namebuf, " (");
        for (i = 0; i < env->ce_argc; i++)
        {
            if (strlen(namebuf) > MAXPDSTRING/2 - 5)
                break;
            if (i != 0)
                strcat(namebuf, " ");
            atom_string(&env->ce_argv[i], namebuf + strlen(namebuf), 
                MAXPDSTRING/2);
        }
        strcat(namebuf, ")");
    }
    else namebuf[0] = 0;
}

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void canvas_reflecttitle(t_canvas *x)
{
    char namebuf[MAXPDSTRING];
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    canvas_args_to_string(namebuf, x);
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    gui_vmess("gui_canvas_set_title", "xsssi",
        x, x->gl_name->s_name,
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        namebuf, canvas_getdir(x)->s_name, x->gl_dirty);
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}

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    /* mark a glist dirty or clean */
void canvas_dirty(t_canvas *x, t_floatarg n)
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{
    t_canvas *x2 = canvas_getrootfor(x);
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    if (glist_amreloadingabstractions)
        return;
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    if ((unsigned)n != x2->gl_dirty)
    {
        x2->gl_dirty = n;
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        if (x2->gl_havewindow) // was glist_isvisible(x2)
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            canvas_reflecttitle(x2);
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    }
}

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void draw_notify(t_canvas *x, t_symbol *s, int argc, t_atom *argv);
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void canvas_scalar_event(t_canvas *x, t_symbol *s, int argc, t_atom *argv)
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{
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    /* These events only get sent when we're not in edit mode.  Once
       we get editmode status sync'd in the GUI we can just prevent
       sending any messages when in edit mode. */
    if (!x->gl_edit)
        draw_notify(x, s, argc, argv);
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}

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extern void canvas_check_nlet_highlights(t_canvas *x);

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/*********** dpsaha@vt.edu resize move hooks ****************/
void canvas_draw_gop_resize_hooks(t_canvas* x)
{
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    t_scalehandle *sh = (t_scalehandle *)(x->x_handle);
    t_scalehandle *mh = (t_scalehandle *)(x->x_mhandle);
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    //fprintf(stderr,"draw_gop_resize_hooks START\n");
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    //in case we are an array which does not initialize its hooks
    if (!sh || !mh) return;
    if(x->gl_edit && glist_isvisible(x) && glist_istoplevel(x) &&
        x->gl_goprect && !x->gl_editor->e_selection)
    {
        //Drawing and Binding Resize_Blob for GOP
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        //fprintf(stderr,"draw_gop_resize_hooks DRAW %lx %lx\n", (t_int)x, (t_int)glist_getcanvas(x));
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        sprintf(sh->h_pathname, ".x%lx.h%lx", (t_int)x, (t_int)sh);
        sprintf(mh->h_pathname, ".x%lx.h%lx", (t_int)x, (t_int)mh);
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//        scalehandle_draw_select(sh,
//            -1-x->gl_obj.te_xpix+x->gl_xmargin + x->gl_pixwidth,
//            -1-x->gl_obj.te_ypix+x->gl_ymargin + x->gl_pixheight/*,GOP_resblob*/);
//        scalehandle_draw_select(mh,
//            2+SCALEHANDLE_WIDTH -x->gl_obj.te_xpix+x->gl_xmargin,
//            2+SCALEHANDLE_HEIGHT-x->gl_obj.te_ypix+x->gl_ymargin /*,"GOP_movblob"*/);

        /* these constants don't actually reflect the actual size of the
           click rectangle-- we should probably change them... */

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        scalehandle_draw_select(mh,
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            SCALEHANDLE_WIDTH - 4, SCALEHANDLE_HEIGHT - 11);
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    }
    else
    {
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        //fprintf(stderr,"draw_gop_resize_hooks ERASE\n");
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        scalehandle_draw_erase(sh);
        scalehandle_draw_erase(mh);
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    }
    canvas_check_nlet_highlights(x);
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}
/*****************************************************************************/

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void canvas_drawredrect(t_canvas *x, int doit)
{
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    if (doit)
    {
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        int x1=x->gl_xmargin, y1=x->gl_ymargin + sys_legacy;
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        int x2=x1+x->gl_pixwidth, y2=y1+x->gl_pixheight;
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        gui_vmess("gui_canvas_drawredrect", "xiiii",
            glist_getcanvas(x),
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            x1, y1, x2, y2);
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        //dpsaha@vt.edu for drawing the GOP_blobs
        if (x->gl_goprect && x->gl_edit)
            canvas_draw_gop_resize_hooks(x);
    }
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    else
    {
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        gui_vmess("gui_canvas_deleteredrect", "x",
            glist_getcanvas(x));
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    }
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}

    /* the window becomes "mapped" (visible and not miniaturized) or
    "unmapped" (either miniaturized or just plain gone.)  This should be
    called from the GUI after the fact to "notify" us that we're mapped. */
void canvas_map(t_canvas *x, t_floatarg f)
{
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    //fprintf(stderr,"canvas_map %lx %f\n", (t_int)x, f);
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    int flag = (f != 0);
    t_gobj *y;
    if (flag)
    {
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        t_selection *sel;
        if (!x->gl_havewindow)
        {
            bug("canvas_map");
            canvas_vis(x, 1);
        }

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        if (!x->gl_list) {
            //if there are no objects on the canvas
            canvas_create_editor(x);
        }
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        else for (y = x->gl_list; y; y = y->g_next) {
            gobj_vis(y, x, 1);
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        }
        if (x->gl_editor && x->gl_editor->e_selection)
            for (sel = x->gl_editor->e_selection; sel; sel = sel->sel_next)
                gobj_select(sel->sel_what, x, 1);
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        x->gl_mapped = 1;
        canvas_drawlines(x);
        if (x->gl_isgraph && x->gl_goprect)
            canvas_drawredrect(x, 1);
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        scrollbar_update(x);
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    }
    else
    {
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        //fprintf(stderr,"canvas_map 0\n");
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        if (glist_isvisible(x))
        {
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            /* just clear out the whole canvas */
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            gui_vmess("gui_canvas_erase_all_gobjs", "x",
                x);
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            x->gl_mapped = 0;
        }
    }
}

void canvas_redraw(t_canvas *x)
{
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    if (do_not_redraw) return;
    //fprintf(stderr,"canvas_redraw %lx\n", (t_int)x);
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    if (glist_isvisible(x))
    {
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        //fprintf(stderr,"canvas_redraw glist_isvisible=true\n");
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        canvas_map(x, 0);
        canvas_map(x, 1);
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        /* now re-highlight our selection */
        t_selection *y;
        if (x->gl_editor && x->gl_editor->e_selection)
            for (y = x->gl_editor->e_selection; y; y = y->sel_next)
                gobj_select(y->sel_what, x, 1);
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    }
}

    /* we call this on a non-toplevel glist to "open" it into its
    own window. */
void glist_menu_open(t_glist *x)
{
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    /* 20151230: moved to canvas_vis, so that scripted vis calls (e.g. via
       [send pd-abstraction-name.pd] do proper redraws of abstractions */
    /*if (glist_isvisible(x))
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    {
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        if (!glist_istoplevel(x))
        {
            t_glist *gl2 = x->gl_owner;
            if (!gl2) 
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                bug("glist_menu_open"); // shouldn't happen but not dangerous
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            else
            {
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                // erase ourself in parent window
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                gobj_vis(&x->gl_gobj, gl2, 0);
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                // get rid of our editor (and subeditors)
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                if (x->gl_editor)
                    canvas_destroy_editor(x);
                x->gl_havewindow = 1;
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                // redraw ourself in parent window (blanked out this time)
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                gobj_vis(&x->gl_gobj, gl2, 1);
            }
        }
        else
        {
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            // Not sure if this needs to get ported... need to test
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            //sys_vgui("focus .x%lx\n", (t_int)x);
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        }
    }
    else
    {
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        if (x->gl_editor)
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        canvas_destroy_editor(x);
    }
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    */
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    canvas_vis(x, 1);
}

int glist_isvisible(t_glist *x)
{
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    return ((!x->gl_loading) && ((x->gl_isgraph && glist_getcanvas(x)->gl_mapped) || (!x->gl_isgraph && x->gl_mapped)));
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}

int glist_istoplevel(t_glist *x)
{
        /* we consider a graph "toplevel" if it has its own window
        or if it appears as a box in its parent window so that we
        don't draw the actual contents there. */
    return (x->gl_havewindow || !x->gl_isgraph);
}

int glist_getfont(t_glist *x)
{
    while (!x->gl_env)
        if (!(x = x->gl_owner))
            bug("t_canvasenvironment");
    return (x->gl_font);
}

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extern void canvas_group_free(t_pd *x);

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void canvas_free(t_canvas *x)
{
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    //fprintf(stderr,"canvas_free %lx\n", (t_int)x);
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    t_gobj *y;
    int dspstate = canvas_suspend_dsp();
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    //canvas_noundo(x);
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    canvas_undo_free(x);
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    if (canvas_editing == x)
        canvas_editing = 0;
    if (canvas_whichfind == x)
        canvas_whichfind = 0;
    glist_noselect(x);
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    x->gl_unloading = 1;
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    while (y = x->gl_list)
        glist_delete(x, y);
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    if (x == glist_getcanvas(x))
        canvas_vis(x, 0);
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    if (x->gl_editor)
        canvas_destroy_editor(x);   /* bug workaround; should already be gone*/
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    if (x-> x_handle) scalehandle_free( x->x_handle);
    if (x->x_mhandle) scalehandle_free(x->x_mhandle);
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    canvas_unbind(x);
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    if (x->gl_env)
    {
        freebytes(x->gl_env->ce_argv, x->gl_env->ce_argc * sizeof(t_atom));
        freebytes(x->gl_env, sizeof(*x->gl_env));
    }
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    canvas_resume_dsp(dspstate);
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    freebytes(x->gl_xlabel, x->gl_nxlabels * sizeof(*(x->gl_xlabel)));
    freebytes(x->gl_ylabel, x->gl_nylabels * sizeof(*(x->gl_ylabel)));
    gstub_cutoff(x->gl_stub);
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    gfxstub_deleteforkey(x);        /* probably unnecessary */
    if (!x->gl_owner)
        canvas_takeofflist(x);
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    if (x->gl_svg)                   /* for groups, free the data */
        canvas_group_free(x->gl_svg);
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}

/* ----------------- lines ---------- */

static void canvas_drawlines(t_canvas *x)
{
    t_linetraverser t;
    t_outconnect *oc;
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    int issignal;
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    linetraverser_start(&t, x);
    while (oc = linetraverser_next(&t))
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    {
        issignal = (outlet_getsymbol(t.tr_outlet) == &s_signal ? 1 : 0);
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        if (!(pd_class(&t.tr_ob2->ob_g.g_pd) == preset_node_class &&
              pd_class(&t.tr_ob->ob_g.g_pd) != message_class))
            canvas_drawconnection(glist_getcanvas(x), t.tr_lx1, t.tr_ly1,
                t.tr_lx2, t.tr_ly2, (t_int)oc, issignal);
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    }
}

void canvas_fixlinesfor(t_canvas *x, t_text *text)
{
    t_linetraverser t;
    t_outconnect *oc;

    linetraverser_start(&t, x);
    while (oc = linetraverser_next(&t))
    {
        if (t.tr_ob == text || t.tr_ob2 == text)
        {
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            canvas_updateconnection(x, t.tr_lx1, t.tr_ly1, t.tr_lx2, t.tr_ly2,
                (t_int)oc);
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        }
    }
}

    /* kill all lines for the object */
void canvas_deletelinesfor(t_canvas *x, t_text *text)
{
    t_linetraverser t;
    t_outconnect *oc;
    linetraverser_start(&t, x);
    while (oc = linetraverser_next(&t))
    {
        if (t.tr_ob == text || t.tr_ob2 == text)
        {
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            if (x->gl_editor && glist_isvisible(glist_getcanvas(x)))
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            {
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                /* Still don't see any place where this gets used. Maybe it's
                   used by older externals? Need to test... */
                //sys_vgui(".x%lx.c delete l%lx\n",
                //    glist_getcanvas(x), oc);
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                /* probably need a gui_vmess here */
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            }
            obj_disconnect(t.tr_ob, t.tr_outno, t.tr_ob2, t.tr_inno);
        }
    }
}

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    /*  delete all lines for the object 
        for efficient redrawing of connections */
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void canvas_eraselinesfor(t_canvas *x, t_text *text)
{
    t_linetraverser t;
    t_outconnect *oc;
    linetraverser_start(&t, x);
    while (oc = linetraverser_next(&t))
    {
        if (t.tr_ob == text || t.tr_ob2 == text)
        {
            if (x->gl_editor)
            {
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                char tagbuf[MAXPDSTRING];
                sprintf(tagbuf, "l%lx", (long unsigned int)oc);
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                gui_vmess("gui_canvas_delete_line", "xs",
                    glist_getcanvas(x), tagbuf);
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            }
        }
    }
}


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    /* kill all lines for one inlet or outlet */
void canvas_deletelinesforio(t_canvas *x, t_text *text,
    t_inlet *inp, t_outlet *outp)
{
    t_linetraverser t;
    t_outconnect *oc;
    linetraverser_start(&t, x);
    while (oc = linetraverser_next(&t))
    {
        if ((t.tr_ob == text && t.tr_outlet == outp) ||
            (t.tr_ob2 == text && t.tr_inlet == inp))
        {
            if (x->gl_editor)
            {
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                char buf[MAXPDSTRING];
                sprintf(buf, "l%lx", (long unsigned int)oc);
                gui_vmess("gui_canvas_delete_line", "xs",
                    glist_getcanvas(x),
                    buf);
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            }
            obj_disconnect(t.tr_ob, t.tr_outno, t.tr_ob2, t.tr_inno);
        }
    }
}

static void canvas_pop(t_canvas *x, t_floatarg fvis)
{
    if (fvis != 0)
        canvas_vis(x, 1);
    pd_popsym(&x->gl_pd);
    canvas_resortinlets(x);
    canvas_resortoutlets(x);
    x->gl_loading = 0;
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    //fprintf(stderr,"loading = 0 .x%lx owner=.x%lx\n", x, x->gl_owner);
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}

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extern void *svg_new(t_pd *x, t_symbol *s, int argc, t_atom *argv);
extern t_pd *svg_header(t_pd *x);

static void group_svginit(t_glist *gl)
{
    gl->gl_svg = (t_pd *)(svg_new((t_pd *)gl, gensym("group"), 0, 0));
    t_pd *proxy = svg_header(gl->gl_svg);
    inlet_new(&gl->gl_obj, proxy, 0, 0);
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    outlet_new(&gl->gl_obj, &s_anything);
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}

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void canvas_objfor(t_glist *gl, t_text *x, int argc, t_atom *argv);

void canvas_restore(t_canvas *x, t_symbol *s, int argc, t_atom *argv)
{
    t_pd *z;
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    int is_draw_command = 0;
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    //fprintf(stderr,"canvas_restore %lx\n", x);
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    /* for [draw group] we add an inlet to the svg attr proxy */
    if (argc > 2 && argv[2].a_w.w_symbol == gensym("draw"))
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    {
        group_svginit(x);
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        is_draw_command = 1;
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    }
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    if (argc > 3 || (is_draw_command && argc > 4))
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    {
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        int offset = is_draw_command ? 4 : 3;
        t_atom *ap=argv+offset;
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        if (ap->a_type == A_SYMBOL)
        {
            t_canvasenvironment *e = canvas_getenv(canvas_getcurrent());
            canvas_rename(x, binbuf_realizedollsym(ap->a_w.w_symbol,
                e->ce_argc, e->ce_argv, 1), 0);
        }
    }
    canvas_pop(x, x->gl_willvis);

    if (!(z = gensym("#X")->s_thing)) error("canvas_restore: out of context");
    else if (*z != canvas_class) error("canvas_restore: wasn't a canvas");
    else
    {
        t_canvas *x2 = (t_canvas *)z;
        x->gl_owner = x2;
        canvas_objfor(x2, &x->gl_obj, argc, argv);
    }
}

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void canvas_loadbangsubpatches(t_canvas *x, t_symbol *s)
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{
    t_gobj *y;
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    //t_symbol *s = gensym("loadbang");
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    for (y = x->gl_list; y; y = y->g_next)
        if (pd_class(&y->g_pd) == canvas_class)
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        {
            if (!canvas_isabstraction((t_canvas *)y))
            {
            //fprintf(stderr,"%lx s:canvas_loadbangsubpatches %s\n",
            //    x, s->s_name);
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            canvas_loadbangsubpatches((t_canvas *)y, s);
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            }
        }
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    for (y = x->gl_list; y; y = y->g_next)
        if ((pd_class(&y->g_pd) != canvas_class) &&
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            zgetfn(&y->g_pd, s))
        {
            //fprintf(stderr,"%lx s:obj_loadbang %s\n",x,s->s_name);
            pd_vmess(&y->g_pd, s, "");
        }
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}

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static void canvas_loadbangabstractions(t_canvas *x, t_symbol *s)
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{
    t_gobj *y;
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    //t_symbol *s = gensym("loadbang");
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    for (y = x->gl_list; y; y = y->g_next)
        if (pd_class(&y->g_pd) == canvas_class)
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        {
            if (canvas_isabstraction((t_canvas *)y))
            {
            //fprintf(stderr,"%lx a:canvas_loadbang %s\n",x,s->s_name);
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            canvas_loadbangabstractions((t_canvas *)y, s);
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            canvas_loadbangsubpatches((t_canvas *)y, s);
            }
            else
            {
                //fprintf(stderr,"%lx a:canvas_loadbangabstractions %s\n",
                //    x, s->s_name);
                canvas_loadbangabstractions((t_canvas *)y, s);
            }
        }
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}

void canvas_loadbang(t_canvas *x)
{
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    //t_gobj *y;
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    // first loadbang preset hubs and nodes
    //fprintf(stderr,"%lx 0\n", x);
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    canvas_loadbangabstractions(x, gensym("pre-loadbang"));
    canvas_loadbangsubpatches(x, gensym("pre-loadbang"));
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    //fprintf(stderr,"%lx 1\n", x);
    // then do the regular loadbang
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    canvas_loadbangabstractions(x, gensym("loadbang"));
    canvas_loadbangsubpatches(x, gensym("loadbang"));
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    //fprintf(stderr,"%lx 2\n", x);
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}
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/* JMZ:
 * initbang is emitted after the canvas is done, but before the parent canvas is done
 * therefore, initbangs cannot reach to the outlets
 */
void canvas_initbang(t_canvas *x)
{
    t_gobj *y;
    t_symbol *s = gensym("initbang");
    /* run "initbang" for all subpatches, but NOT for the child abstractions */
    for (y = x->gl_list; y; y = y->g_next)
      if (pd_class(&y->g_pd) == canvas_class)
        {
          if (!canvas_isabstraction((t_canvas *)y))
            canvas_initbang((t_canvas *)y);
        }
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    /* call the initbang()-method for objects that have one */
    for (y = x->gl_list; y; y = y->g_next)
      {
        if ((pd_class(&y->g_pd) != canvas_class) && zgetfn(&y->g_pd, s))
          {
            pd_vmess(&y->g_pd, s, "");
          }
      }
}
/* JMZ:
 * closebang is emitted before the canvas is destroyed
 * and BEFORE subpatches/abstractions in this canvas are destroyed
 */
void canvas_closebang(t_canvas *x)
{
    t_gobj *y;
    t_symbol *s = gensym("closebang");
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    /* call the closebang()-method for objects that have one 
     * but NOT for subpatches/abstractions: these are called separately
     * from g_graph:glist_delete()
     */
    for (y = x->gl_list; y; y = y->g_next)
      {
        if ((pd_class(&y->g_pd) != canvas_class) && zgetfn(&y->g_pd, s))
          {
            pd_vmess(&y->g_pd, s, "");
          }
      }
}
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// we use this function to check if the canvas that has sent out the <config>
// signal, meaning it has been resized, if we have scalars in there and
// the canvas has gop enabled, we need to redraw the window to make sure
// scalars scale with the window
void canvas_checkconfig(t_canvas *x)
{
    //fprintf(stderr,"canvas_checkconfig\n");
    t_gobj *y;
    if (x->gl_isgraph)
    {
        for (y = x->gl_list; y; y = y->g_next)
        {
            if (pd_class(&y->g_pd) == scalar_class)
            {
                //fprintf(stderr,"...redrawing\n");
                canvas_redraw(x);
                break;
            }
        }
    }
}

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/* needed for readjustment of garrays */
extern t_array *garray_getarray(t_garray *x);
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extern void garray_fittograph(t_garray *x, int n, int flag);
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extern t_rtext *glist_findrtext(t_glist *gl, t_text *who);
extern void rtext_gettext(t_rtext *x, char **buf, int *bufsize);

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static void canvas_relocate(t_canvas *x, t_symbol *canvasgeom,
    t_symbol *topgeom)
{
    int cxpix, cypix, cw, ch, txpix, typix, tw, th;
    if (sscanf(canvasgeom->s_name, "%dx%d+%d+%d", &cw, &ch, &cxpix, &cypix)
        < 4 ||
        sscanf(topgeom->s_name, "%dx%d+%d+%d", &tw, &th, &txpix, &typix) < 4)
        bug("canvas_relocate");
            /* for some reason this is initially called with cw=ch=1 so
            we just suppress that here. */
    if (cw > 5 && ch > 5)
        canvas_setbounds(x, txpix, typix,
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            txpix + cw, typix + ch);
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    /* readjust garrays (if any) */
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    t_gobj *g;
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    t_garray *ga = NULL;
    t_array *a = NULL;
    int  num_elem = 0;

    for (g = x->gl_list; g; g = g->g_next)
    {
        //fprintf(stderr, "searching\n");

        //for subpatch garrays
        if (pd_class(&g->g_pd) == garray_class)
        {
            //fprintf(stderr,"found ya\n");
            ga = (t_garray *)g;
            if (ga)
            {
                a = garray_getarray(ga);
                num_elem = a->a_n;
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                garray_fittograph(ga, num_elem, 1);
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            }
        }
    }
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    canvas_checkconfig(x);
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}

void canvas_popabstraction(t_canvas *x)
{
    newest = &x->gl_pd;
    pd_popsym(&x->gl_pd);
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    //x->gl_loading = 1;
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    //fprintf(stderr,"loading = 1 .x%lx owner=.x%lx\n", x, x->gl_owner);
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    canvas_resortinlets(x);
    canvas_resortoutlets(x);
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    x->gl_loading = 0;
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    //fprintf(stderr,"loading = 0 .x%lx owner=.x%lx\n", x, x->gl_owner);
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}

void canvas_logerror(t_object *y)
{
#ifdef LATER
    canvas_vis(x, 1);
    if (!glist_isselected(x, &y->ob_g))
        glist_select(x, &y->ob_g);
#endif
}

/* -------------------------- subcanvases ---------------------- */

static void *subcanvas_new(t_symbol *s)
{
    t_atom a[6];
    t_canvas *x, *z = canvas_getcurrent();
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    //fprintf(stderr,"subcanvas_new current canvas .x%lx\n", (t_int)z);
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    if (!*s->s_name) s = gensym("/SUBPATCH/");
    SETFLOAT(a, 0);
    SETFLOAT(a+1, GLIST_DEFCANVASYLOC);
    SETFLOAT(a+2, GLIST_DEFCANVASWIDTH);
    SETFLOAT(a+3, GLIST_DEFCANVASHEIGHT);
    SETSYMBOL(a+4, s);
    SETFLOAT(a+5, 1);
    x = canvas_new(0, 0, 6, a);
    x->gl_owner = z;
    canvas_pop(x, 1);
    return (x);
}

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void *group_new(t_symbol *s)
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{
    t_canvas *x = subcanvas_new(s);
    group_svginit(x);
    return (x);
}
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static void canvas_click(t_canvas *x,
    t_floatarg xpos, t_floatarg ypos,
        t_floatarg shift, t_floatarg ctrl, t_floatarg alt)
{
    canvas_vis(x, 1);
}


    /* find out from subcanvas contents how much to fatten the box */
void canvas_fattensub(t_canvas *x,
    int *xp1, int *yp1, int *xp2, int *yp2)
{
    *xp2 += 50;     /* fake for now */
    *yp2 += 50;
}

static void canvas_rename_method(t_canvas *x, t_symbol *s, int ac, t_atom *av)
{
    if (ac && av->a_type == A_SYMBOL)
        canvas_rename(x, av->a_w.w_symbol, 0);
    else if (ac && av->a_type == A_DOLLSYM)
    {
        t_canvasenvironment *e = canvas_getenv(x);
        canvas_setcurrent(x);
        canvas_rename(x, binbuf_realizedollsym(av->a_w.w_symbol,
            e->ce_argc, e->ce_argv, 1), 0); 
        canvas_unsetcurrent(x);
    }
    else canvas_rename(x, gensym("Pd"), 0);
}

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static int forwardmess_recurse = 0;

static void canvas_forwardmess(t_canvas *x, t_symbol *s, int ac, t_atom *av)
{
    if (av[0].a_type != A_FLOAT)
    {
        pd_error(x, "error: canvas: forwardmess: need object index");
        return;
    }
    t_int indexno = (t_int)atom_getfloatarg(0, ac--, av++);
    if (indexno < 0) indexno = 0;
    t_gobj *y;
    t_int i;
    for (i = 0, y = x->gl_list; y && i < indexno; i++)
        y = y->g_next;
    if (!y) return;
    if (forwardmess_recurse++ < 1)
        pd_forwardmess((t_pd *)y, ac, av);
    else
        pd_error(y, "error: canvas: forwardmess can't be in a recursive loop");
    forwardmess_recurse = 0;
}

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/* ------------------ table ---------------------------*/

static int tabcount = 0;

static void *table_new(t_symbol *s, t_floatarg f)
{
    t_atom a[9];
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    t_atom ga[4];
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    t_glist *gl;
    t_canvas *x, *z = canvas_getcurrent();
    if (s == &s_)
    {
         char  tabname[255];
         t_symbol *t = gensym("table"); 
         sprintf(tabname, "%s%d", t->s_name, tabcount++);
         s = gensym(tabname); 
    }
    if (f <= 1)
        f = 100;
    SETFLOAT(a, 0);
    SETFLOAT(a+1, GLIST_DEFCANVASYLOC);
    SETFLOAT(a+2, 600);
    SETFLOAT(a+3, 400);
    SETSYMBOL(a+4, s);
    SETFLOAT(a+5, 0);
    x = canvas_new(0, 0, 6, a);

    x->gl_owner = z;

        /* create a graph for the table */
    gl = glist_addglist((t_glist*)x, &s_, 0, -1, (f > 1 ? f-1 : 1), 1,
        50, 350, 550, 50);

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    SETSYMBOL(ga, s);
    SETFLOAT(ga+1, f);
    SETSYMBOL(ga+2, &s_float);
    SETFLOAT(ga+3, 0);
    graph_array(gl, gensym("array"), 4, ga);
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    canvas_pop(x, 0); 

    return (x);
}

    /* return true if the "canvas" object is an abstraction (so we don't
    save its contents, fogr example.)  */
int canvas_isabstraction(t_canvas *x)
{
    return (x->gl_env != 0);
}

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    /* return true if the "canvas" object should be bound to a name */
static int canvas_should_bind(t_canvas *x)
{
        /* FIXME should have a "backwards compatible" mode */
        /* not named "Pd" && (is top level || is subpatch) */
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    return strcmp(x->gl_name->s_name, "Pd"); // && (!x->gl_owner || !x->gl_env);
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}

static void canvas_bind(t_canvas *x)
{
    if (canvas_should_bind(x))
        pd_bind(&x->gl_pd, canvas_makebindsym(x->gl_name));
}

static void canvas_unbind(t_canvas *x)
{
    if (canvas_should_bind(x))
        pd_unbind(&x->gl_pd, canvas_makebindsym(x->gl_name));
}

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    /* return true if the "canvas" object is a "table". */
int canvas_istable(t_canvas *x)
{
    t_atom *argv = (x->gl_obj.te_binbuf? binbuf_getvec(x->gl_obj.te_binbuf):0);
    int argc = (x->gl_obj.te_binbuf? binbuf_getnatom(x->gl_obj.te_binbuf) : 0);
    int istable = (argc && argv[0].a_type == A_SYMBOL &&
        argv[0].a_w.w_symbol == gensym("table"));
    return (istable);
}

    /* return true if the "canvas" object should be treated as a text
    object.  This is true for abstractions but also for "table"s... */
/* JMZ: add a flag to gop-abstractions to hide the title */
int canvas_showtext(t_canvas *x)
{
    t_atom *argv = (x->gl_obj.te_binbuf? binbuf_getvec(x->gl_obj.te_binbuf):0);
    int argc = (x->gl_obj.te_binbuf? binbuf_getnatom(x->gl_obj.te_binbuf) : 0);
    int isarray = (argc && argv[0].a_type == A_SYMBOL &&
        argv[0].a_w.w_symbol == gensym("graph"));
    if(x->gl_hidetext)
      return 0;
    else
      return (!isarray);
}

    /* get the document containing this canvas */
t_canvas *canvas_getrootfor(t_canvas *x)
{
    if ((!x->gl_owner) || canvas_isabstraction(x))
        return (x);
    else return (canvas_getrootfor(x->gl_owner));
}

/* ------------------------- DSP chain handling ------------------------- */

EXTERN_STRUCT _dspcontext;
#define t_dspcontext struct _dspcontext

void ugen_start(void);
void ugen_stop(void);

t_dspcontext *ugen_start_graph(int toplevel, t_signal **sp,
    int ninlets, int noutlets);
void ugen_add(t_dspcontext *dc, t_object *x);
void ugen_connect(t_dspcontext *dc, t_object *x1, int outno,
    t_object *x2, int inno);
void ugen_done_graph(t_dspcontext *dc);

    /* schedule one canvas for DSP.  This is called below for all "root"
    canvases, but is also called from the "dsp" method for sub-
    canvases, which are treated almost like any other tilde object.  */