g_template.c 258 KB
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/* Copyright (c) 1997-1999 Miller Puckette.
* For information on usage and redistribution, and for a DISCLAIMER OF ALL
* WARRANTIES, see the file, "LICENSE.txt," in this distribution.  */

#include <stdlib.h>
#include <string.h>
#include <stdio.h>
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#include <math.h>  /* for matrix transforms */
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#include "m_pd.h"
#include "s_stuff.h"    /* for sys_hostfontsize */
#include "g_canvas.h"

void array_redraw(t_array *a, t_glist *glist);
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void graph_graphrect(t_gobj *z, t_glist *glist,
    int *xp1, int *yp1, int *xp2, int *yp2);
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/*
This file contains text objects you would put in a canvas to define a
template.  Templates describe objects of type "array" (g_array.c) and
"scalar" (g_scalar.c).
*/

    /* the structure of a "struct" object (also the obsolete "gtemplate"
    you get when using the name "template" in a box.) */

struct _gtemplate
{
    t_object x_obj;
    t_template *x_template;
    t_canvas *x_owner;
    t_symbol *x_sym;
    struct _gtemplate *x_next;
    int x_argc;
    t_atom *x_argv;
};

/* ---------------- forward definitions ---------------- */

static void template_conformarray(t_template *tfrom, t_template *tto,
    int *conformaction, t_array *a);
static void template_conformglist(t_template *tfrom, t_template *tto,
    t_glist *glist,  int *conformaction);
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t_canvas *canvas_templatecanvas_forgroup(t_canvas *c);
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static int drawimage_getindex(void *z, t_template *template, t_word *data);
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/* ---------------------- storage ------------------------- */

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t_class *gtemplate_class;
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static t_class *template_class;

/* there's a pre-defined "float" template.  LATER should we bind this
to a symbol such as "pd-float"??? */

    /* return true if two dataslot definitions match */
static int dataslot_matches(t_dataslot *ds1, t_dataslot *ds2,
    int nametoo)
{
    return ((!nametoo || ds1->ds_name == ds2->ds_name) &&
        ds1->ds_type == ds2->ds_type &&
            (ds1->ds_type != DT_ARRAY ||
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                ds1->ds_fieldtemplate == ds2->ds_fieldtemplate));
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}

/* -- templates, the active ingredient in gtemplates defined below. ------- */

t_template *template_new(t_symbol *templatesym, int argc, t_atom *argv)
{
    t_template *x = (t_template *)pd_new(template_class);
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    //fprintf(stderr,"template_new %lx\n", x);
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    x->t_n = 0;
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    x->t_transformable = 0;
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    x->t_vec = (t_dataslot *)t_getbytes(0);
    while (argc > 0)
    {
        int newtype, oldn, newn;
        t_symbol *newname, *newarraytemplate = &s_, *newtypesym;
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        t_binbuf *newbinbuf = NULL;
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        if (argc < 2 || argv[0].a_type != A_SYMBOL ||
            argv[1].a_type != A_SYMBOL)
                goto bad;
        newtypesym = argv[0].a_w.w_symbol;
        newname = argv[1].a_w.w_symbol;
        if (newtypesym == &s_float)
            newtype = DT_FLOAT;
        else if (newtypesym == &s_symbol)
            newtype = DT_SYMBOL;
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//        else if (newtypesym == &s_list)
//            newtype = DT_LIST;
        else if (newtypesym == gensym("canvas"))
        {
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            char filename[MAXPDSTRING+3];
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            t_binbuf *b = binbuf_new();
            if (argc < 3 || argv[2].a_type != A_SYMBOL)
            {
                pd_error(x, "canvas lacks template or name");
                goto bad;
            }
//            filename = canvas_makebindsym(argv[2].a_w.w_symbol);
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            sprintf(filename, "%s.pd", argv[2].a_w.w_symbol->s_name);
            if (binbuf_read_via_canvas(b, filename, canvas_getcurrent(), 0))
                post("warning: abstraction %s not found", filename);
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            else
                newbinbuf = b;
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            newtype = DT_LIST;
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            argc--;
            argv++;
        }
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        else if (newtypesym == gensym("array"))
        {
            if (argc < 3 || argv[2].a_type != A_SYMBOL)
            {
                pd_error(x, "array lacks element template or name");
                goto bad;
            }
            newarraytemplate = canvas_makebindsym(argv[2].a_w.w_symbol);
            newtype = DT_ARRAY;
            argc--;
            argv++;
        }
        else
        {
            pd_error(x, "%s: no such type", newtypesym->s_name);
            goto bad;
        }
        newn = (oldn = x->t_n) + 1;
        x->t_vec = (t_dataslot *)t_resizebytes(x->t_vec,
            oldn * sizeof(*x->t_vec), newn * sizeof(*x->t_vec));
        x->t_n = newn;
        x->t_vec[oldn].ds_type = newtype;
        x->t_vec[oldn].ds_name = newname;
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        x->t_vec[oldn].ds_fieldtemplate = newarraytemplate;
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        x->t_vec[oldn].ds_binbuf = newbinbuf;
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    bad: 
        argc -= 2; argv += 2;
    }
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    if (*templatesym->s_name)
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    {
        x->t_sym = templatesym;
        pd_bind(&x->t_pdobj, x->t_sym);
    }
    else x->t_sym = templatesym;
    return (x);
}

int template_size(t_template *x)
{
    return (x->t_n * sizeof(t_word));
}

int template_find_field(t_template *x, t_symbol *name, int *p_onset,
    int *p_type, t_symbol **p_arraytype)
{
    int i, n;
    if (!x)
    {
        bug("template_find_field");
        return (0);
    }
    n = x->t_n;
    for (i = 0; i < n; i++)
        if (x->t_vec[i].ds_name == name)
    {
        *p_onset = i * sizeof(t_word);
        *p_type = x->t_vec[i].ds_type;
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        *p_arraytype = x->t_vec[i].ds_fieldtemplate;
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        return (1);
    }
    return (0);
}

t_float template_getfloat(t_template *x, t_symbol *fieldname, t_word *wp,
    int loud)
{
    int onset, type;
    t_symbol *arraytype;
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    t_float val = 0;
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    if (template_find_field(x, fieldname, &onset, &type, &arraytype))
    {
        if (type == DT_FLOAT)
            val = *(t_float *)(((char *)wp) + onset);
        else if (loud) error("%s.%s: not a number",
            x->t_sym->s_name, fieldname->s_name);
    }
    else if (loud) error("%s.%s: no such field",
        x->t_sym->s_name, fieldname->s_name);
    return (val);
}

void template_setfloat(t_template *x, t_symbol *fieldname, t_word *wp, 
    t_float f, int loud)
{
    int onset, type;
    t_symbol *arraytype;
    if (template_find_field(x, fieldname, &onset, &type, &arraytype))
     {
        if (type == DT_FLOAT)
            *(t_float *)(((char *)wp) + onset) = f;
        else if (loud) error("%s.%s: not a number",
            x->t_sym->s_name, fieldname->s_name);
    }
    else if (loud) error("%s.%s: no such field",
        x->t_sym->s_name, fieldname->s_name);
}

t_symbol *template_getsymbol(t_template *x, t_symbol *fieldname, t_word *wp,
    int loud)
{
    int onset, type;
    t_symbol *arraytype;
    t_symbol *val = &s_;
    if (template_find_field(x, fieldname, &onset, &type, &arraytype))
    {
        if (type == DT_SYMBOL)
            val = *(t_symbol **)(((char *)wp) + onset);
        else if (loud) error("%s.%s: not a symbol",
            x->t_sym->s_name, fieldname->s_name);
    }
    else if (loud) error("%s.%s: no such field",
        x->t_sym->s_name, fieldname->s_name);
    return (val);
}

void template_setsymbol(t_template *x, t_symbol *fieldname, t_word *wp, 
    t_symbol *s, int loud)
{
    int onset, type;
    t_symbol *arraytype;
    if (template_find_field(x, fieldname, &onset, &type, &arraytype))
     {
        if (type == DT_SYMBOL)
            *(t_symbol **)(((char *)wp) + onset) = s;
        else if (loud) error("%s.%s: not a symbol",
            x->t_sym->s_name, fieldname->s_name);
    }
    else if (loud) error("%s.%s: no such field",
        x->t_sym->s_name, fieldname->s_name);
}

    /* stringent check to see if a "saved" template, x2, matches the current
        one (x1).  It's OK if x1 has additional scalar elements but not (yet)
        arrays or lists.  This is used for reading in "data files". */
int template_match(t_template *x1, t_template *x2)
{
    int i;
    if (x1->t_n < x2->t_n)
        return (0);
    for (i = x2->t_n; i < x1->t_n; i++)
    {
        if (x1->t_vec[i].ds_type == DT_ARRAY || 
            x1->t_vec[i].ds_type == DT_LIST)
                return (0);
    }
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    //if (x2->t_n > x1->t_n)
    //    post("add elements...");
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    for (i = 0; i < x2->t_n; i++)
        if (!dataslot_matches(&x1->t_vec[i], &x2->t_vec[i], 1))
            return (0);
    return (1);
}

/* --------------- CONFORMING TO CHANGES IN A TEMPLATE ------------ */

/* the following routines handle updating scalars to agree with changes
in their template.  The old template is assumed to be the "installed" one
so we can delete old items; but making new ones we have to avoid scalar_new
which would make an old one whereas we will want a new one (but whose array
elements might still be old ones.)
    LATER deal with graphics updates too... */

    /* conform the word vector of a scalar to the new template */    
static void template_conformwords(t_template *tfrom, t_template *tto,
    int *conformaction, t_word *wfrom, t_word *wto)
{
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    int nto = tto->t_n, i;
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    for (i = 0; i < nto; i++)
    {
        if (conformaction[i] >= 0)
        {
                /* we swap the two, in case it's an array or list, so that
                when "wfrom" is deleted the old one gets cleaned up. */
            t_word wwas = wto[i];
            wto[i] = wfrom[conformaction[i]];
            wfrom[conformaction[i]] = wwas;
        }
    }
}

    /* conform a scalar, recursively conforming sublists and arrays  */
static t_scalar *template_conformscalar(t_template *tfrom, t_template *tto,
    int *conformaction, t_glist *glist, t_scalar *scfrom)
{
    t_scalar *x;
    t_gpointer gp;
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    int i;
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    t_template *scalartemplate;
    /* post("conform scalar"); */
        /* possibly replace the scalar */
    if (scfrom->sc_template == tfrom->t_sym)
    {
            /* see scalar_new() for comment about the gpointer. */
        gpointer_init(&gp);
        x = (t_scalar *)getbytes(sizeof(t_scalar) +
            (tto->t_n - 1) * sizeof(*x->sc_vec));
        x->sc_gobj.g_pd = scalar_class;
        x->sc_template = tfrom->t_sym;
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        gpointer_setglist(&gp, glist, &x->sc_gobj);
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            /* Here we initialize to the new template, but array and list
            elements will still belong to old template. */
        word_init(x->sc_vec, tto, &gp);

        template_conformwords(tfrom, tto, conformaction,
            scfrom->sc_vec, x->sc_vec);
            
            /* replace the old one with the new one in the list */
        if (glist->gl_list == &scfrom->sc_gobj)
        {
            glist->gl_list = &x->sc_gobj;
            x->sc_gobj.g_next = scfrom->sc_gobj.g_next;
        }
        else
        {
            t_gobj *y, *y2;
            for (y = glist->gl_list; y2 = y->g_next; y = y2)
                if (y2 == &scfrom->sc_gobj)
            {
                x->sc_gobj.g_next = y2->g_next;
                y->g_next = &x->sc_gobj;
                goto nobug;
            }
            bug("template_conformscalar");
        nobug: ;
        }
            /* burn the old one */
        pd_free(&scfrom->sc_gobj.g_pd);
        scalartemplate = tto;
    }
    else
    {
        x = scfrom;
        scalartemplate = template_findbyname(x->sc_template);
    }
        /* convert all array elements and sublists */
    for (i = 0; i < scalartemplate->t_n; i++)
    {
        t_dataslot *ds = scalartemplate->t_vec + i;
        if (ds->ds_type == DT_LIST)
        {
            t_glist *gl2 = x->sc_vec[i].w_list;
            template_conformglist(tfrom, tto, gl2, conformaction);
        }
        else if (ds->ds_type == DT_ARRAY)
        {
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            t_symbol *arraytemplate = ds->ds_fieldtemplate;
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            if (arraytemplate == tfrom->t_sym ||
                arraytemplate == tto->t_sym)
            {
                return 0;
            }
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            template_conformarray(tfrom, tto, conformaction, 
                x->sc_vec[i].w_array);
        }
    }
    return (x);
}

    /* conform an array, recursively conforming sublists and arrays  */
static void template_conformarray(t_template *tfrom, t_template *tto,
    int *conformaction, t_array *a)
{
    int i, j;
    t_template *scalartemplate = 0;
    if (a->a_templatesym == tfrom->t_sym)
    {
        /* the array elements must all be conformed */
        int oldelemsize = sizeof(t_word) * tfrom->t_n,
            newelemsize = sizeof(t_word) * tto->t_n;
        char *newarray = getbytes(newelemsize * a->a_n);
        char *oldarray = a->a_vec;
        if (a->a_elemsize != oldelemsize)
            bug("template_conformarray");
        for (i = 0; i < a->a_n; i++)
        {
            t_word *wp = (t_word *)(newarray + newelemsize * i);
            word_init(wp, tto, &a->a_gp);
            template_conformwords(tfrom, tto, conformaction,
                (t_word *)(oldarray + oldelemsize * i), wp);
            word_free((t_word *)(oldarray + oldelemsize * i), tfrom);
        }
        scalartemplate = tto;
        a->a_vec = newarray;
        freebytes(oldarray, oldelemsize * a->a_n);
    }
    else scalartemplate = template_findbyname(a->a_templatesym);
        /* convert all arrays and sublist fields in each element of the array */
    for (i = 0; i < a->a_n; i++)
    {
        t_word *wp = (t_word *)(a->a_vec + sizeof(t_word) * a->a_n * i);
        for (j = 0; j < scalartemplate->t_n; j++)
        {
            t_dataslot *ds = scalartemplate->t_vec + j;
            if (ds->ds_type == DT_LIST)
            {
                t_glist *gl2 = wp[j].w_list;
                template_conformglist(tfrom, tto, gl2, conformaction);
            }
            else if (ds->ds_type == DT_ARRAY)
            {
                template_conformarray(tfrom, tto, conformaction, 
                    wp[j].w_array);
            }
        }
    }
}

    /* this routine searches for every scalar in the glist that belongs
    to the "from" template and makes it belong to the "to" template.  Descend
    glists recursively.
    We don't handle redrawing here; this is to be filled in LATER... */

t_array *garray_getarray(t_garray *x);

static void template_conformglist(t_template *tfrom, t_template *tto,
    t_glist *glist,  int *conformaction)
{
    t_gobj *g;
    /* post("conform glist %s", glist->gl_name->s_name); */
    for (g = glist->gl_list; g; g = g->g_next)
    {
        if (pd_class(&g->g_pd) == scalar_class)
            g = &template_conformscalar(tfrom, tto, conformaction,
                glist, (t_scalar *)g)->sc_gobj;
        else if (pd_class(&g->g_pd) == canvas_class)
            template_conformglist(tfrom, tto, (t_glist *)g, conformaction);
        else if (pd_class(&g->g_pd) == garray_class)
            template_conformarray(tfrom, tto, conformaction,
                garray_getarray((t_garray *)g));
    }
}

    /* globally conform all scalars from one template to another */ 
void template_conform(t_template *tfrom, t_template *tto)
{
    int nto = tto->t_n, nfrom = tfrom->t_n, i, j,
        *conformaction = (int *)getbytes(sizeof(int) * nto),
        *conformedfrom = (int *)getbytes(sizeof(int) * nfrom), doit = 0;
    for (i = 0; i < nto; i++)
        conformaction[i] = -1;
    for (i = 0; i < nfrom; i++)
        conformedfrom[i] = 0;
    for (i = 0; i < nto; i++)
    {
        t_dataslot *dataslot = &tto->t_vec[i];
        for (j = 0; j < nfrom; j++)
        {
            t_dataslot *dataslot2 = &tfrom->t_vec[j];
            if (dataslot_matches(dataslot, dataslot2, 1))
            {
                conformaction[i] = j;
                conformedfrom[j] = 1;
            }
        }
    }
    for (i = 0; i < nto; i++)
        if (conformaction[i] < 0)
    {
        t_dataslot *dataslot = &tto->t_vec[i];
        for (j = 0; j < nfrom; j++)
            if (!conformedfrom[j] &&
                dataslot_matches(dataslot, &tfrom->t_vec[j], 0))
        {
            conformaction[i] = j;
            conformedfrom[j] = 1;
        }
    }
    if (nto != nfrom)
        doit = 1;
    else for (i = 0; i < nto; i++)
        if (conformaction[i] != i)
            doit = 1;

    if (doit)
    {
        t_glist *gl;
        post("conforming template '%s' to new structure",
            tfrom->t_sym->s_name);
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        //for (i = 0; i < nto; i++)
        //    post("... %d", conformaction[i]);
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        for (gl = canvas_list; gl; gl = gl->gl_next)
            template_conformglist(tfrom, tto, gl, conformaction);
    }
    freebytes(conformaction, sizeof(int) * nto);
    freebytes(conformedfrom, sizeof(int) * nfrom);
}

t_template *template_findbyname(t_symbol *s)
{
    return ((t_template *)pd_findbyclass(s, template_class));
}

t_canvas *template_findcanvas(t_template *template)
{
    t_gtemplate *gt;
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    if (!template)
    {
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        bug("template_findcanvas");
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        return (0);
    }
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    if (!(gt = template->t_list))
        return (0);
    return (gt->x_owner);
    /* return ((t_canvas *)pd_findbyclass(template->t_sym, canvas_class)); */
}

void template_notify(t_template *template, t_symbol *s, int argc, t_atom *argv)
{
    if (template->t_list)
        outlet_anything(template->t_list->x_obj.ob_outlet, s, argc, argv);
}

    /* bash the first of (argv) with a pointer to a scalar, and send on
    to template as a notification message */
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void template_notifyforscalar(t_template *template, t_glist *owner,
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    t_scalar *sc, t_symbol *s, int argc, t_atom *argv)
{
    t_gpointer gp;
    gpointer_init(&gp);
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    gpointer_setglist(&gp, owner, &sc->sc_gobj);
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    SETPOINTER(argv, &gp);
    template_notify(template, s, argc, argv);
    gpointer_unset(&gp);
}

    /* call this when reading a patch from a file to declare what templates
    we'll need.  If there's already a template, check if it matches.
    If it doesn't it's still OK as long as there are no "struct" (gtemplate)
    objects hanging from it; we just conform everyone to the new template.
    If there are still struct objects belonging to the other template, we're
    in trouble.  LATER we'll figure out how to conform the new patch's objects
    to the pre-existing struct. */
static void *template_usetemplate(void *dummy, t_symbol *s,
    int argc, t_atom *argv)
{
    t_template *x;
    t_symbol *templatesym =
        canvas_makebindsym(atom_getsymbolarg(0, argc, argv));
    if (!argc)
        return (0);
    argc--; argv++;
            /* check if there's already a template by this name. */
    if ((x = (t_template *)pd_findbyclass(templatesym, template_class)))
    {
        t_template *y = template_new(&s_, argc, argv), *y2;
            /* If the new template is the same as the old one,
            there's nothing to do.  */
        if (!template_match(x, y))
        {
                /* Are there "struct" objects upholding this template? */
            if (x->t_list)
            {
                    /* don't know what to do here! */
                error("%s: template mismatch",
                    templatesym->s_name);
            }
            else
            {
                    /* conform everyone to the new template */
                template_conform(x, y);
                pd_free(&x->t_pdobj);
                y2 = template_new(templatesym, argc, argv);
                y2->t_list = 0;
            }
        }
        pd_free(&y->t_pdobj);
    }
        /* otherwise, just make one. */
    else template_new(templatesym, argc, argv);
    return (0);
}

    /* here we assume someone has already cleaned up all instances of this. */
void template_free(t_template *x)
{
    if (*x->t_sym->s_name)
        pd_unbind(&x->t_pdobj, x->t_sym);
    t_freebytes(x->t_vec, x->t_n * sizeof(*x->t_vec));
}

static void template_setup(void)
{
    template_class = class_new(gensym("template"), 0, (t_method)template_free,
        sizeof(t_template), CLASS_PD, 0);
    class_addmethod(pd_canvasmaker, (t_method)template_usetemplate,
        gensym("struct"), A_GIMME, 0);
        
}

/* ---------------- gtemplates.  One per canvas. ----------- */

/* "Struct": an object that searches for, and if necessary creates, 
a template (above).  Other objects in the canvas then can give drawing
instructions for the template.  The template doesn't go away when the
"struct" is deleted, so that you can replace it with
another one to add new fields, for example. */

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static void gtemplate_free(t_gtemplate *x);

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static void *gtemplate_donew(t_symbol *sym, int argc, t_atom *argv)
{
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    t_canvas *cur = canvas_getcurrent();
    t_gobj *gob = cur->gl_list;
    while (gob)
    {
        if (pd_class(&gob->g_pd) == gtemplate_class)
        {
            error("%s: only one struct allowed per canvas.", cur->gl_name->s_name);
            return(0);
        }
        gob = gob->g_next;
    }
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    t_gtemplate *x = (t_gtemplate *)pd_new(gtemplate_class);
    t_template *t = template_findbyname(sym);
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    int i;
    x->x_owner = canvas_getcurrent();
    x->x_next = 0;
    x->x_sym = sym;
    x->x_argc = argc;
    x->x_argv = (t_atom *)getbytes(argc * sizeof(t_atom));
    for (i = 0; i < argc; i++)
        x->x_argv[i] = argv[i];

        /* already have a template by this name? */
    if (t)
    {
        x->x_template = t;
            /* if it's already got a "struct" object we
            just tack this one to the end of the list and leave it
            there. */
        if (t->t_list)
        {
            t_gtemplate *x2, *x3;
            for (x2 = x->x_template->t_list; x3 = x2->x_next; x2 = x3)
                ;
            x2->x_next = x;
            post("template %s: warning: already exists.", sym->s_name);
        }
        else
        {
                /* if there's none, we just replace the template with
                our own and conform it. */
            t_template *y = template_new(&s_, argc, argv);
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            canvas_redrawallfortemplate(t, 2);
                /* Unless the new template is different from the old one,
                there's nothing to do.  */
            if (!template_match(t, y))
            {
                    /* conform everyone to the new template */
                template_conform(t, y);
                pd_free(&t->t_pdobj);
                t = template_new(sym, argc, argv);
            }
            pd_free(&y->t_pdobj);
            t->t_list = x;
            canvas_redrawallfortemplate(t, 1);
        }
    }
    else
    {
            /* otherwise make a new one and we're the only struct on it. */
        x->x_template = t = template_new(sym, argc, argv);
        t->t_list = x;
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   }
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    outlet_new(&x->x_obj, 0);
    return (x);
}

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int template_check_array_fields(t_symbol *structname, t_template *template);

/* probably duplicating some code from template_new here... */
int gtemplate_cancreate(t_symbol *templatename, int argc, t_atom *argv)
{
    while (argc > 1)
    {
        t_symbol *typesym = argv[0].a_w.w_symbol;
        if (typesym == &s_float || typesym == &s_symbol)
        {
            argc -= 2;
            argv += 2; 
        }
        else if (typesym == gensym("array"))
        {
            if (argc > 2 && argv[2].a_type == A_SYMBOL)
            {
                /* check for cancreation here */
                t_template *elemtemplate =
                    template_findbyname(canvas_makebindsym(argv[2].a_w.w_symbol));
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                if (!elemtemplate)
                {
                    post("warning: template %s does not exist",
                        argv[2].a_w.w_symbol->s_name);
                }
                else if (template_check_array_fields(
                        canvas_makebindsym(templatename), elemtemplate) == 0)
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                {
                    return 0;
                }
                argc -= 3;
                argv += 3;
            }
            else
            {
                argc -= 2;
                argv += 2;
            }
        }
        else
        {
            argc -= 2;
            argv += 2;
        }
    }
    return 1;
}

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static void *gtemplate_new(t_symbol *s, int argc, t_atom *argv)
{
    t_symbol *sym = atom_getsymbolarg(0, argc, argv);
    if (argc >= 1)
        argc--; argv++;
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    if (gtemplate_cancreate(sym, argc, argv))
    {
        return (gtemplate_donew(canvas_makebindsym(sym), argc, argv));
    }
    else
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        return (0);
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}

    /* old version (0.34) -- delete 2003 or so */
static void *gtemplate_new_old(t_symbol *s, int argc, t_atom *argv)
{
    t_symbol *sym = canvas_makebindsym(canvas_getcurrent()->gl_name);
    static int warned;
    if (!warned)
    {
        post("warning -- 'template' (%s) is obsolete; replace with 'struct'",
            sym->s_name);
        warned = 1;
    }
    return (gtemplate_donew(sym, argc, argv));
}

t_template *gtemplate_get(t_gtemplate *x)
{
    return (x->x_template);
}

static void gtemplate_free(t_gtemplate *x)
{
        /* get off the template's list */
    t_template *t = x->x_template;
    t_gtemplate *y;
    if (x == t->t_list)
    {
        canvas_redrawallfortemplate(t, 2);
        if (x->x_next)
        {
                /* if we were first on the list, and there are others on
                the list, make a new template corresponding to the new
                first-on-list and replace the existing template with it. */
            t_template *z = template_new(&s_,
                x->x_next->x_argc, x->x_next->x_argv);
            template_conform(t, z);
            pd_free(&t->t_pdobj);
            pd_free(&z->t_pdobj);
            z = template_new(x->x_sym, x->x_next->x_argc, x->x_next->x_argv);
            z->t_list = x->x_next;
            for (y = z->t_list; y ; y = y->x_next)
                y->x_template = z;
        }
        else t->t_list = 0;
        canvas_redrawallfortemplate(t, 1);
    }
    else
    {
        t_gtemplate *x2, *x3;
        for (x2 = t->t_list; x3 = x2->x_next; x2 = x3)
        {
            if (x == x3)
            {
                x2->x_next = x3->x_next;
                break;
            }
        }
    }
    freebytes(x->x_argv, sizeof(t_atom) * x->x_argc);
}

static void gtemplate_setup(void)
{
    gtemplate_class = class_new(gensym("struct"),
        (t_newmethod)gtemplate_new, (t_method)gtemplate_free,
        sizeof(t_gtemplate), CLASS_NOINLET, A_GIMME, 0);
    class_addcreator((t_newmethod)gtemplate_new_old, gensym("template"),
        A_GIMME, 0);
}

/* ---------------  FIELD DESCRIPTORS ---------------------- */

/* a field descriptor can hold a constant or a variable; if a variable,
it's the name of a field in the template we belong to.  LATER, we might
want to cache the offset of the field so we don't have to search for it
every single time we draw the object.
*/

struct _fielddesc
{
    char fd_type;       /* LATER consider removing this? */
    char fd_var;
    union
    {
        t_float fd_float;       /* the field is a constant float */
        t_symbol *fd_symbol;    /* the field is a constant symbol */
        t_symbol *fd_varsym;    /* the field is variable and this is the name */
    } fd_un;
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    float fd_v1;        /* min and max values */
    float fd_v2;
    float fd_screen1;   /* min and max screen values */
    float fd_screen2;
    float fd_quantum;   /* quantization in value */ 
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};

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static void fielddesc_setfloat_const(t_fielddesc *fd, t_float f)
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{
    fd->fd_type = A_FLOAT;
    fd->fd_var = 0;
    fd->fd_un.fd_float = f;
    fd->fd_v1 = fd->fd_v2 = fd->fd_screen1 = fd->fd_screen2 =
        fd->fd_quantum = 0;
}

static void fielddesc_setsymbol_const(t_fielddesc *fd, t_symbol *s)
{
    fd->fd_type = A_SYMBOL;
    fd->fd_var = 0;
    fd->fd_un.fd_symbol = s;
    fd->fd_v1 = fd->fd_v2 = fd->fd_screen1 = fd->fd_screen2 =
        fd->fd_quantum = 0;
}

static void fielddesc_setfloat_var(t_fielddesc *fd, t_symbol *s)
{
    char *s1, *s2, *s3, strbuf[MAXPDSTRING];
    fd->fd_type = A_FLOAT;
    fd->fd_var = 1;
    if (!(s1 = strchr(s->s_name, '(')) || !(s2 = strchr(s->s_name, ')'))
        || (s1 > s2))
    {
        fd->fd_un.fd_varsym = s;
        fd->fd_v1 = fd->fd_v2 = fd->fd_screen1 = fd->fd_screen2 =
            fd->fd_quantum = 0;
    }
    else
    {
        int cpy = s1 - s->s_name, got;
        if (cpy > MAXPDSTRING-5)
            cpy = MAXPDSTRING-5;
        strncpy(strbuf, s->s_name, cpy);
        strbuf[cpy] = 0;
        fd->fd_un.fd_varsym = gensym(strbuf);
        got = sscanf(s1, "(%f:%f)(%f:%f)(%f)",
            &fd->fd_v1, &fd->fd_v2, &fd->fd_screen1, &fd->fd_screen2,
                &fd->fd_quantum);
        if (got < 2)
            goto fail;
        if (got == 3 || (got < 4 && strchr(s2, '(')))
            goto fail;
        if (got < 5 && (s3 = strchr(s2, '(')) && strchr(s3+1, '('))
            goto fail;
        if (got == 4)
            fd->fd_quantum = 0;
        else if (got == 2)
        {
            fd->fd_quantum = 0;
            fd->fd_screen1 = fd->fd_v1;
            fd->fd_screen2 = fd->fd_v2;
        }
        return;
    fail:
        post("parse error: %s", s->s_name);
        fd->fd_v1 = fd->fd_screen1 = fd->fd_v2 = fd->fd_screen2 =
            fd->fd_quantum = 0;
    }
}

#define CLOSED 1
#define BEZ 2
#define NOMOUSE 4
#define A_ARRAY 55      /* LATER decide whether to enshrine this in m_pd.h */

static void fielddesc_setfloatarg(t_fielddesc *fd, int argc, t_atom *argv)
{
        if (argc <= 0) fielddesc_setfloat_const(fd, 0);
        else if (argv->a_type == A_SYMBOL)
            fielddesc_setfloat_var(fd, argv->a_w.w_symbol);
        else fielddesc_setfloat_const(fd, argv->a_w.w_float);
}

static void fielddesc_setsymbolarg(t_fielddesc *fd, int argc, t_atom *argv)
{
        if (argc <= 0) fielddesc_setsymbol_const(fd, &s_);
        else if (argv->a_type == A_SYMBOL)
        {
            fd->fd_type = A_SYMBOL;
            fd->fd_var = 1;
            fd->fd_un.fd_varsym = argv->a_w.w_symbol;
            fd->fd_v1 = fd->fd_v2 = fd->fd_screen1 = fd->fd_screen2 =
                fd->fd_quantum = 0;
        }
        else fielddesc_setsymbol_const(fd, &s_);
}

static void fielddesc_setarrayarg(t_fielddesc *fd, int argc, t_atom *argv)
{
        if (argc <= 0) fielddesc_setfloat_const(fd, 0);
        else if (argv->a_type == A_SYMBOL)
        {
            fd->fd_type = A_ARRAY;
            fd->fd_var = 1;
            fd->fd_un.fd_varsym = argv->a_w.w_symbol;
        }
        else fielddesc_setfloat_const(fd, argv->a_w.w_float);
}

    /* getting and setting values via fielddescs -- note confusing names;
    the above are setting up the fielddesc itself. */
static t_float fielddesc_getfloat(t_fielddesc *f, t_template *template,
    t_word *wp, int loud)
{
    if (f->fd_type == A_FLOAT)
    {
        if (f->fd_var)
            return (template_getfloat(template, f->fd_un.fd_varsym, wp, loud));
        else return (f->fd_un.fd_float);
    }
    else
    {
        if (loud)
            error("symbolic data field used as number");
        return (0);
    }
}

    /* convert a variable's value to a screen coordinate via its fielddesc */
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t_float fielddesc_cvttocoord(t_fielddesc *f, t_float val)
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{
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    t_float coord, extreme, div;
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    if (f->fd_v2 == f->fd_v1)
        return (val);
    div = (f->fd_screen2 - f->fd_screen1)/(f->fd_v2 - f->fd_v1);
    coord = f->fd_screen1 + (val - f->fd_v1) * div;
    extreme = (f->fd_screen1 < f->fd_screen2 ?
        f->fd_screen1 : f->fd_screen2);
    if (coord < extreme)
        coord = extreme;
    extreme = (f->fd_screen1 > f->fd_screen2 ? 
        f->fd_screen1 : f->fd_screen2);
    if (coord > extreme)
        coord = extreme;
    return (coord);
}

    /* read a variable via fielddesc and convert to screen coordinate */
t_float fielddesc_getcoord(t_fielddesc *f, t_template *template,
    t_word *wp, int loud)
{
    if (f->fd_type == A_FLOAT)
    {
        if (f->fd_var)
        {
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            t_float val = template_getfloat(template,
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                f->fd_un.fd_varsym, wp, loud);
            return (fielddesc_cvttocoord(f, val));
        }
        else return (f->fd_un.fd_float);
    }
    else
    {
        if (loud)
            error("symbolic data field used as number");
        return (0);
    }
}

static t_symbol *fielddesc_getsymbol(t_fielddesc *f, t_template *template,
    t_word *wp, int loud)
{
    if (f->fd_type == A_SYMBOL)
    {
        if (f->fd_var)
            return(template_getsymbol(template, f->fd_un.fd_varsym, wp, loud));
        else return (f->fd_un.fd_symbol);
    }
    else
    {
        if (loud)
            error("numeric data field used as symbol");
        return (&s_);
    }
}

    /* convert from a screen coordinate to a variable value */
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{
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    t_float val;
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    if (f->fd_screen2 == f->fd_screen1)
        val = coord;
    else
    {
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        t_float div = (f->fd_v2 - f->fd_v1)/(f->fd_screen2 - f->fd_screen1);
        t_float extreme;
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        val = f->fd_v1 + (coord - f->fd_screen1) * div;
        if (f->fd_quantum != 0)
            val = ((int)((val/f->fd_quantum) + 0.5)) *  f->fd_quantum;
        extreme = (f->fd_v1 < f->fd_v2 ?
            f->fd_v1 : f->fd_v2);
        if (val < extreme) val = extreme;
        extreme = (f->fd_v1 > f->fd_v2 ?
            f->fd_v1 : f->fd_v2);
        if (val > extreme) val = extreme;
    }
    return (val);
 }

void fielddesc_setcoord(t_fielddesc *f, t_template *template,
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    t_word *wp, t_float coord, int loud)
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{
    if (f->fd_type == A_FLOAT && f->fd_var)
    {
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        t_float val = fielddesc_cvtfromcoord(f, coord);
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        template_setfloat(template,
                f->fd_un.fd_varsym, wp, val, loud);
    }
    else
    {
        if (loud)
            error("attempt to set constant or symbolic data field to a number");
    }
}

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/* ---------------- draw svg shapes and paths ---------------- */

/*
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draw objects belong to templates and describe how the data in the template
are to be drawn.  The coordinates of the draw (and other display features)
can be attached to fields in the template.
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todo: some better way than drawcurve has for defining click widgetbehaviors
    (just checking for field variables and moving joints is too simplistic)
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*/

t_class *draw_class;

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t_class *drawimage_class;

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t_class *svg_class;

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/* this is a wrapper around t_fielddesc-- it adds a flag for two reasons:
   1) tkpath defaults to inheriting values for options from the parent until
      you specify them-- after that, there's no way to get back to "inherit".
      We set the flag to "0" to mean "inherit"-- that way we don't send a tcl
      string for that option.  There's still the bug that the user can't set
      an attribute back to "inherit" after they've set something explicitly,
      however.
   2) This might be generally useful even with Qt, so that if the user calls
      a method for an attribute without any arguments, Qt goes back to
      inheriting the value from the parent.  That gives us a way to
      differentiate "inherit" from fielddescriptors, the value "none" and
      "".  (Similar to the way "set" resets a message box.)
*/
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typedef struct _svg_attr
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{
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    int a_flag;
    t_fielddesc a_attr;
} t_svg_attr;

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/* events on which to output a notification from the outlet of [draw] */
typedef struct _svg_event
{
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    t_svg_attr e_focusin,
               e_focusout,
               e_activate,
               e_click,
               e_mousedown,
               e_mouseup,
               e_mouseover,
               e_mousemove,
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               e_mouseout,
               e_drag; /* not in the svg spec, but should have been */
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} t_svg_event;

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/* svg attributes */
typedef struct _svg
{
    t_pd x_pd;
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    void *x_parent; /* parent object-- [group], [draw] or [draw image] */
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    int x_flags;
    t_symbol *x_type;
    t_fielddesc x_fill[3];
    int x_filltype;
    t_svg_attr x_fillopacity;
    t_svg_attr x_fillrule;
    t_fielddesc x_stroke[3];
    int x_stroketype;
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    int x_ndash;
    t_fielddesc *x_strokedasharray; /* array of lengths */
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    t_svg_attr x_strokedashoffset;
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    t_svg_event x_events;
    t_fielddesc x_drag; /* convenience event, not part of the svg spec */
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    t_svg_attr x_opacity;
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    t_svg_attr x_pointerevents;
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    t_svg_attr x_strokelinecap;
    t_svg_attr x_strokelinejoin;
    t_svg_attr x_strokemiterlimit;
    t_svg_attr x_strokeopacity;
    t_svg_attr x_strokewidth;
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    t_svg_attr x_rx; /* for rounded rectangles, ellipse,
                        and abused for
                        circle (aka 'r')
                        line (aka 'x2') */
    t_svg_attr x_ry; /* abused for line (aka 'y2') */
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    int x_transform_n;
    t_fielddesc *x_transform;
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    t_svg_attr x_x; /* doubles as 'cx' and 'x1' */
    t_svg_attr x_y; /* doubles as 'cy' and 'y1' */
    t_svg_attr x_width;
    t_svg_attr x_height;
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    t_svg_attr x_vis;
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    t_fielddesc x_bbox; /* turn bbox calculation on or off */
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    int x_pathrect_cache; /* 0 to recalc on next draw_getrect call
                             1 for cached
                            -1 to turn off caching */
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    int x_x1; /* for cached bbox */
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    int x_y1;
    int x_x2;
    int x_y2;
    int x_nargs;
    t_fielddesc *x_vec;
    int *x_nargs_per_cmd;      /* points per each path command */
    int x_npathcmds;
    char *x_pathcmds; /* for path commands */
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} t_svg;

typedef struct _draw
{
    t_object x_obj;
    t_symbol *x_drawtype;
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    t_canvas *x_canvas;
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    t_pd *x_attr;
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} t_draw;

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typedef struct _drawimage
{
    t_object x_obj;
    t_fielddesc x_value; /* todo: rename to index */
    t_fielddesc x_xloc;
    t_fielddesc x_yloc;
    t_fielddesc x_vis;
    t_symbol *x_img;
    t_float x_w;
    t_float x_h;
    int x_flags;
    int x_deleteme;
    t_canvas *x_canvas;
    t_pd *x_attr;
} t_drawimage;

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extern t_outlet *obj_rightmost_outlet(t_object *x);

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void draw_notifyforscalar(t_object *x, t_glist *owner,
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    t_scalar *sc, t_symbol *s, int argc, t_atom *argv)
{
    t_gpointer gp;
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    t_binbuf *b = binbuf_new();
    t_atom at[1];
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    gpointer_init(&gp);
    gpointer_setglist(&gp, owner, &sc->sc_gobj);
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    SETPOINTER(at, &gp);
    binbuf_add(b, 1, at);
    binbuf_add(b, argc, argv);
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    if (x)
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    {
        t_outlet *out;
        if (pd_class(&x->te_pd) == canvas_class)
            out = obj_rightmost_outlet(x);
        else
            out = x->ob_outlet;
        outlet_anything(out, s, binbuf_getnatom(b),
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            binbuf_getvec(b));
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    }
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    gpointer_unset(&gp);
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    binbuf_free(b);
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}

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static int is_svgpath_cmd(t_symbol *s)
{
    /* 1 for absolute cmd, 2 for relative */
    if (s == gensym("M") || s == gensym("Z") || s == gensym("L") ||
        s == gensym("H") || s == gensym("V") || s == gensym("C") ||
        s == gensym("S") || s == gensym("Q") || s == gensym("T") ||
        s == gensym("A"))
        return 1;
    else if (s == gensym("m") || s == gensym("z") || s == gensym("l") ||
        s == gensym("h") || s == gensym("v") || s == gensym("c") ||
        s == gensym("s") || s == gensym("q") || s == gensym("t") ||
        s == gensym("a"))
        return 2;
    else return 0;
}

static int path_ncmds(int argc, t_atom *argv)
{
    int i, j = 0;
    for(i = 0; i < argc; i++)
    {
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        if (argv[i].a_type == A_SYMBOL &&
            is_svgpath_cmd(atom_getsymbol(argv+i)))
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            j++;
    }
    return j;
}

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void svg_attr_setfloatarg(t_svg_attr *a, int argc, t_atom *argv)
{
    fielddesc_setfloatarg(&a->a_attr, argc, argv);
    a->a_flag = 1;
}

void svg_attr_setfloat_const(t_svg_attr *a, float n)
{
    fielddesc_setfloat_const(&a->a_attr, 0);
    a->a_flag = 0;
}

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void *svg_new(t_pd *parent, t_symbol *s, int argc, t_atom *argv)
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{
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    t_fielddesc *fd;
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    int i, flags = 0;
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    t_svg *x = (t_svg *)pd_new(svg_class);
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    t_symbol *type = x->x_type = s;
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    x->x_flags = flags;
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    x->x_parent = (void *)parent;
    fielddesc_setfloat_const(&x->x_vis.a_attr, 1);
    /* let it inherit visibility from parent group, if present */
    x->x_vis.a_flag = 0;
    /* the following should be set in method space */
    /* flags |= NOMOUSE; */
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    if (type == gensym("rect") ||
        type == gensym("circle") ||
        type == gensym("ellipse") ||
        type == gensym("line"))
    {
        if (argc) svg_attr_setfloatarg(&x->x_x, argc--, argv++);
        else svg_attr_setfloat_const(&x->x_x, 0);
        if (argc) svg_attr_setfloatarg(&x->x_y, argc--, argv++);
        else svg_attr_setfloat_const(&x->x_x, 0);
        if (type == gensym("rect"))
        {
            if (argc) svg_attr_setfloatarg(&x->x_width, argc--, argv++);
            else svg_attr_setfloat_const(&x->x_width, 0);
            if (argc) svg_attr_setfloatarg(&x->x_height, argc--, argv++);
            else svg_attr_setfloat_const(&x->x_height, 0);
        }
        else
        {
            if (argc) svg_attr_setfloatarg(&x->x_rx, argc--, argv++);
            else svg_attr_setfloat_const(&x->x_rx, 0);
            if (argc) svg_attr_setfloatarg(&x->x_ry, argc--, argv++);
            else svg_attr_setfloat_const(&x->x_ry, 0);
        }
    }
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    if (x->x_type == gensym("path"))
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    {
        int ncmds = x->x_npathcmds = path_ncmds(argc, argv);
        x->x_pathcmds = (char *)t_getbytes(ncmds * sizeof(char));
        x->x_nargs_per_cmd = (int *)t_getbytes(ncmds * sizeof(int));
        for (i = 0; i < ncmds; i++) x->x_nargs_per_cmd[i] = 0;
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        x->x_nargs = argc - ncmds;
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    }
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    else if (x->x_type == gensym("group"))
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    {
        x->x_nargs = 0;
        x->x_vec = 0;
    }
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    else
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    {
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        x->x_nargs = argc;
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    }
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    x->x_vec = (t_fielddesc *)t_getbytes(x->x_nargs * sizeof(t_fielddesc));
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    if (argc && x->x_type == gensym("path"))
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    {
        if (argv->a_type != A_SYMBOL ||
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            (atom_getsymbol(argv) != gensym("M") &&
             atom_getsymbol(argv) != gensym("m")))
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        {
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            /* this should probably be the parent instead of "x" */
            pd_error(x->x_parent, "draw path: path data must start "
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                        "with a moveto command (M or m)");
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            return 0;
        }
    }
    int cmdn = -1; /* hack */
    for (i = 0, fd = x->x_vec; i < argc; i++, argv++)
    {
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        if (x->x_type == gensym("path") &&
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            argv->a_type == A_SYMBOL &&
            is_svgpath_cmd(atom_getsymbol(argv)))
        {
                x->x_pathcmds[++cmdn] = *(atom_getsymbol(argv)->s_name);
        }
        else
        {
            fielddesc_setfloatarg(fd++, 1, argv);
            /* post("got a coord"); */
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            if (x->x_type == gensym("path"))
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            {
                (x->x_nargs_per_cmd[cmdn])++;
                /* if we get a field variable, just
                   turn off the get_rect caching */
                if (argv->a_type == A_SYMBOL)
                    x->x_pathrect_cache = -1;
            }
        }
    }
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    fielddesc_setfloat_const(&x->x_bbox, 1);
    fielddesc_setfloat_const(&x->x_drag, 0);
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    x->x_filltype = 0;
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    x->x_fillopacity.a_flag = 0;
    x->x_fillrule.a_flag = 0;
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    fielddesc_setfloat_const(&x->x_pointerevents.a_attr, 1);
    x->x_pointerevents.a_flag = 0;
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    x->x_stroketype = 0;
    x->x_strokelinecap.a_flag = 0;
    x->x_strokelinejoin.a_flag = 0;
    x->x_strokemiterlimit.a_flag = 0;
    x->x_strokeopacity.a_flag = 0;
    x->x_strokewidth.a_flag = 0;
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    x->x_x1 = 0;
    x->x_x2 = 0;
    x->x_y1 = 0;
    x->x_y2 = 0;

    x->x_ndash = 0;
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    x->x_strokedasharray =
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        (t_fielddesc *)t_getbytes(x->x_ndash * sizeof(t_fielddesc));
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    x->x_transform_n = 0;
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    x->x_strokedashoffset.a_flag = 0;
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    x->x_transform = (t_fielddesc *)t_getbytes(x->x_transform_n *
        sizeof(t_fielddesc));
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    /* initialize events */
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    fielddesc_setfloat_const(&x->x_events.e_focusin.a_attr, 0);
    x->x_events.e_focusin.a_flag = 0;
    fielddesc_setfloat_const(&x->x_events.e_focusout.a_attr, 0);
    x->x_events.e_focusout.a_flag = 0;
    fielddesc_setfloat_const(&x->x_events.e_activate.a_attr, 0);
    x->x_events.e_activate.a_flag = 0;
    fielddesc_setfloat_const(&x->x_events.e_click.a_attr, 0);
    x->x_events.e_click.a_flag = 0;
    fielddesc_setfloat_const(&x->x_events.e_mousedown.a_attr, 0);
    x->x_events.e_mousedown.a_flag = 0;
    fielddesc_setfloat_const(&x->x_events.e_mouseup.a_attr, 0);
    x->x_events.e_mouseup.a_flag = 0;
    fielddesc_setfloat_const(&x->x_events.e_mouseover.a_attr, 0);
    x->x_events.e_mouseover.a_flag = 0;
    fielddesc_setfloat_const(&x->x_events.e_mousemove.a_attr, 0);
    x->x_events.e_mousemove.a_flag = 0;
    fielddesc_setfloat_const(&x->x_events.e_mouseout.a_attr, 0);
    x->x_events.e_mouseout.a_flag = 0;
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    fielddesc_setfloat_const(&x->x_events.e_drag.a_attr, 0);
    x->x_events.e_drag.a_flag = 0;
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    char buf[50];
    // Here we bind the parent object to the addy for
    // the svg. This way both [group] and [draw] will have
    // the same binding symbol
    sprintf(buf, "x%lx", (long unsigned int)x);
    pd_bind(parent, gensym(buf));

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    return (x);
}

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t_pd *svg_header(t_pd *x)
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{
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    return (&(((t_svg *)x)->x_pd));
}

static int symbol_isdrawtype(t_symbol *s)
{
    if (s == gensym("circle")  || s == gensym("ellipse")  ||
        s == gensym("line")    || s == gensym("path")     ||
        s == gensym("polygon") || s == gensym("polyline") ||
        s == gensym("rect")    || s == gensym("image")    ||
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        s == gensym("sprite")  || s == gensym("group"))
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    {
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        return 1;
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    }
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    else
        return 0;
}
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static void *drawimage_new(t_symbol *classsym, int argc, t_atom *argv);
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extern void *group_new(t_symbol *s);
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static void *draw_new(t_symbol *classsym, t_int argc, t_atom *argv)
{
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    t_symbol *type;
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    if (argc && argv->a_type == A_SYMBOL &&
        symbol_isdrawtype(argv[0].a_w.w_symbol))
    {
        type = atom_getsymbolarg(0, argc--, argv++);
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        /* sprite and image have their own widgetbehavior, so they
        have their own class and new function */
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        if (type == gensym("sprite") || type == gensym("image"))
            return (drawimage_new(type, argc, argv));
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        else if (type == gensym("group"))
        {
            t_symbol *group_name;
            if (argc > 0 && argv->a_type == A_SYMBOL)
                group_name = atom_getsymbolarg(0, argc, argv);
            else group_name = &s_;
            post("group name is %s", group_name->s_name);
            return (group_new(group_name));
        }
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    }
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    else
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    {
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        type = gensym("rect");
        post("warning: draw: no shape specified, defaulting to 'rect'");
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    }
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    t_draw *x = (t_draw *)pd_new(draw_class);

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    /* create a proxy for drawing/svg attributes */
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    if (!(x->x_attr = (t_pd *)svg_new((t_pd *)x, type, argc, argv)))
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    {
        pd_error(x, "draw: path data must start with 'm' or 'M'");
        return (0);
    }
    /* now that we have our proxy, make an inlet for it.
       The inlet will belong to our draw object, but the
       svg_class will actually receive the messages
       to the inlet. */
    t_svg *sa = (t_svg *)x->x_attr;
    inlet_new(&x->x_obj, &sa->x_pd, 0, 0);
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    /* outlet for event notifications */
    outlet_new(&x->x_obj, &s_anything);

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    /* x_canvas can stay here */
    x->x_canvas = canvas_getcurrent();
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    return (x);
}

t_canvas *svg_parentcanvas(t_svg *x)
{
    /* this is probably a better interface... I am
       returning c sometimes because it works for my
       use case, but that doesn't seem like a sensible
       interface in general. */
    t_canvas *ret = 0;
    if (x->x_type == gensym("group"))
    {
        t_canvas *c = (t_canvas *)x->x_parent;
        if (c->gl_owner)
            ret = c->gl_owner;
        else
            ret = c;
    }
    else if (x->x_type == gensym("sprite") ||
             x->x_type == gensym("image"))
    {
        t_drawimage *d = (t_drawimage *)x->x_parent;
        ret = d->x_canvas;
    }
    else
    {
        t_draw *d = (t_draw *)x->x_parent;
        ret = d->x_canvas;
    }
    return (ret);
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}

static char *rgb_to_hex(int r, int g, int b)
{
    static char hexc[10];
    int r1 = r < 0 ? 0 : r;
    if (r1 > 255) r1 = 255;
    int g1 = g < 0 ? 0 : g;
    if (g1 > 255) g1 = 255;
    int b1 = b < 0 ? 0 : b;
    if (b1 > 255) b1 = 255;
    sprintf(hexc, "#%.6x", (r1 << 16) + (g1 << 8) + b1);
    return hexc;
}

char *get_strokelinecap(int a)
{
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    static char strokelinecap[15];
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    if (a == 0) sprintf(strokelinecap, "butt");
    else if (a == 1) sprintf(strokelinecap, "round");
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    else if (a == 2) sprintf(strokelinecap, "projecting");
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    else sprintf(strokelinecap, "butt");
    return (strokelinecap);
}

char *get_strokelinejoin(int a)
{
    static char strokelinejoin[8];
    if (a == 0) sprintf(strokelinejoin, "miter");
    else if (a == 1) sprintf(strokelinejoin, "round");
    else if (a == 2) sprintf(strokelinejoin, "bevel");
    else sprintf(strokelinejoin, "miter");
    return (strokelinejoin);
}

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t_svg_attr *svg_getattr(t_svg *x, t_symbol *s)
{
    if (s == gensym("fill-opacity")) return &x->x_fillopacity;
    else if (s == gensym("fill-rule")) return &x->x_fillrule;
    else if (s == gensym("height")) return &x->x_height;
    else if (s == gensym("opacity")) return &x->x_opacity;
    else if (s == gensym("pointer-events")) return &x->x_pointerevents;
    else if (s == gensym("rx") || s == gensym("r") || s == gensym("x2"))
        return &x->x_rx;
    else if (s == gensym("ry") || s == gensym("y2"))
        return &x->x_ry;
    else if (s == gensym("stroke-opacity")) return &x->x_strokeopacity;
    else if (s == gensym("stroke-dashoffset")) return &x->x_strokedashoffset;
    else if (s == gensym("stroke-linecap")) return &x->x_strokelinecap;
    else if (s == gensym("stroke-linejoin")) return &x->x_strokelinejoin;
    else if (s == gensym("stroke-miterlimit")) return &x->x_strokemiterlimit;
    else if (s == gensym("stroke-width")) return &x->x_strokewidth;
    else if (s == gensym("vis")) return &x->x_vis;
    else if (s == gensym("width")) return &x->x_width;
    else if (s == gensym("x") || s == gensym("cx") || s == gensym("x1"))
        return &x->x_x;
    else if (s == gensym("y") || s == gensym("cy") || s == gensym("y1"))
        return &x->x_y;
    return 0;
}

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void svg_parsetransform(t_svg *x, t_template *template, t_word *data,
    t_float *mp1, t_float *mp2, t_float *mp3,
    t_float *mp4, t_float *mp5, t_float *mp6);

void svg_group_pathrect_cache(t_svg *x, int state);

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extern void scalar_drawselectrect(t_scalar *x, t_glist *glist, int state);
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void svg_sendupdate(t_svg *x, t_canvas *c, t_symbol *s,
    t_template *template, t_word *data, int *predraw_bbox, void *parent,
    t_scalar *sc)
{
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   /* todo-- I'm mixing "c" with glist_getcanvas(c) too freely...
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      need to experiment with gop scalars to make sure I'm not breaking
      anything */ 
    int in_array = (sc->sc_vec != data);
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    //post("in_array is %d", in_array);
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    char tag[MAXPDSTRING];
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    if (x->x_type == gensym("group"))
    {
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        sprintf(tag, "%s%lx.%lx",
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            (in_array ? "scelem" : "dgroup"),
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            (long unsigned int)x->x_parent,
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            (long unsigned int)data);
    }
    else
    {
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        sprintf(tag, "draw%lx.%lx",
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            (long unsigned int)x->x_parent,
            (long unsigned int)data);
    }
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    if (s == gensym("bbox"))
        *predraw_bbox = 1;
    else if (s == gensym("fill"))
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    {
        t_symbol *fill;
        t_fielddesc *fd = x->x_fill;
        if (x->x_filltype == 1)
            fill = fielddesc_getsymbol(fd, template, data, 1);
        else if (x->x_filltype == 2)
        {
            fill = gensym(rgb_to_hex(
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                (int)fielddesc_getcoord(fd, template, data, 1),
                (int)fielddesc_getcoord(fd+1, template, data, 1),
                (int)fielddesc_getcoord(fd+2, template, data, 1)));
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        }
        else
            fill = &s_;
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        gui_vmess("gui_draw_configure", "xsss",
            glist_getcanvas(c), tag, s->s_name, fill->s_name);
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    }
    else if (s == gensym("stroke"))
    {
        t_symbol *stroke;
        t_fielddesc *fd = x->x_stroke;
        if (x->x_stroketype == 1)
            stroke = fielddesc_getsymbol(fd, template, data, 1);
        else if (x->x_stroketype == 2)
        {
            stroke = gensym(rgb_to_hex(
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                (int)fielddesc_getcoord(fd, template, data, 1),
                (int)fielddesc_getcoord(fd+1, template, data, 1),
                (int)fielddesc_getcoord(fd+2, template, data, 1)));
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        }
        else stroke = &s_;
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        gui_vmess("gui_draw_configure", "xsss",
            glist_getcanvas(c), tag, s->s_name, stroke->s_name);
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    }
    else if (s == gensym("fill-rule"))
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        gui_vmess("gui_draw_configure", "xssi",
            glist_getcanvas(c), tag, "fill-rule",
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            (int)fielddesc_getcoord(
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                &x->x_fillrule.a_attr, template, data, 1) ?
                    "evenodd" : "nonzero");
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    else if (s == gensym("fill-opacity") ||
             s == gensym("opacity") ||
             s == gensym("stroke-dashoffset") ||
             s == gensym("stroke-miterlimit") ||
             s == gensym("stroke-opacity"))
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        gui_vmess("gui_draw_configure", "xssf",
            glist_getcanvas(c), tag, s->s_name,
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            fielddesc_getcoord(
                &(svg_getattr(x, s)->a_attr), template, data, 1));
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    else if (s == gensym("pointer-events"))
        *predraw_bbox = 1;
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    else if (s == gensym("stroke-linecap"))
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        gui_vmess("gui_draw_configure", "xsss",
            glist_getcanvas(c), tag, "stroke-linecap",
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                get_strokelinecap(
                    (int)fielddesc_getcoord(&x->x_strokelinecap.a_attr,
                        template, data, 1)));
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    else if (s == gensym("stroke-linejoin"))
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        gui_vmess("gui_draw_configure", "xsss",
            glist_getcanvas(c), tag, "stroke-linejoin",
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                get_strokelinejoin(
                    (int)fielddesc_getcoord(&x->x_strokelinejoin.a_attr,
                        template, data, 1)));
    else if (s == gensym("stroke-width") ||
             s == gensym("rx") || s == gensym("r") || s == gensym("x2") ||
             s == gensym("ry") || s == gensym("y2") ||
             s == gensym("x") || s == gensym("cx") || s == gensym("x1") ||
             s == gensym("y") || s == gensym("cy") || s == gensym("y1") ||
             s == gensym("height") || s == gensym("width"))
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    {
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        gui_vmess("gui_draw_configure", "xssf",
            glist_getcanvas(c), tag, s->s_name,
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            fielddesc_getcoord(
                &(svg_getattr(x, s)->a_attr), template, data, 1));
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        *predraw_bbox = 1;
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    }
    else if (s == gensym("transform"))
    {
        t_float m1, m2, m3, m4, m5, m6;
        /* we'll probably get a different bbox now, so we
           will calculate a new one the next time we call
           draw_getrect for this draw command. For groups
           we need to do it for all of the draw commands
           inside it.
        */
        if (x->x_type == gensym("group"))
            svg_group_pathrect_cache(x, 0);
        else if (x->x_pathrect_cache != -1)
        {
            x->x_pathrect_cache = 0;
        }
        svg_parsetransform(x, template, data, &m1, &m2, &m3, &m4, &m5, &m6);
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        char mbuf[MAXPDSTRING];
        sprintf(mbuf, "matrix(%g %g %g %g %g %g)", m1, m2, m3, m4, m5, m6);
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        gui_vmess("gui_draw_configure", "xsss",
            glist_getcanvas(c), tag, s->s_name,
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            mbuf);
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        *predraw_bbox = 1;
    }
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    else if (s == gensym("mouseover"))
    {
        gui_vmess("gui_draw_event", "xsxxsi",
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            glist_getcanvas(c), tag, sc, x, "mouseover",
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            (int)fielddesc_getcoord(
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                &x->x_events.e_mouseover.a_attr, template, data, 1));
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    }
    else if (s == gensym("mouseout"))
    {
        gui_vmess("gui_draw_event", "xsxxsi",
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            glist_getcanvas(c), tag, sc, x, "mouseout",
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            (int)fielddesc_getcoord(
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                &x->x_events.e_mouseout.a_attr, template, data, 1));
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    }
    else if (s == gensym("mousemove"))
    {
        gui_vmess("gui_draw_event", "xsxxsi",
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            glist_getcanvas(c), tag, sc, x, "mousemove",
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            (int)fielddesc_getcoord(
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                &x->x_events.e_mousemove.a_attr, template, data, 1));
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    }
    else if (s == gensym("mouseup"))
    {
        gui_vmess("gui_draw_event", "xsxxsi",
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            glist_getcanvas(c), tag, sc, x, "mouseup",
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            (int)fielddesc_getcoord(
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                &x->x_events.e_mouseup.a_attr, template, data, 1));
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    }
    else if (s == gensym("mousedown"))
    {
        gui_vmess("gui_draw_event", "xsxxsi",
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            glist_getcanvas(c), tag, sc, x, "mousedown",
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            (int)fielddesc_getcoord(
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                &x->x_events.e_mousedown.a_attr, template, data, 1));
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    }
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    else if (s == gensym("drag"))
    {
        gui_vmess("gui_draw_drag_event", "xsxxsi",
            glist_getcanvas(c), tag, sc, x, "drag",
            (int)fielddesc_getcoord(
                &x->x_events.e_drag.a_attr, template, data, 1));
    }
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    else if (s == gensym("vis"))
    {
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        gui_vmess("gui_draw_configure", "xsss",
            glist_getcanvas(c), tag, "visibility",
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            (int)fielddesc_getcoord(
                &x->x_vis.a_attr, template, data, 1) ? "visible" : "hidden");
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        *predraw_bbox = 1;
    }
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    else if (s == gensym("stroke-dasharray"))
    {
        if (x->x_ndash)
        {
            t_fielddesc *fd = x->x_strokedasharray;
            int i;
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            gui_start_vmess("gui_draw_configure", "xss",
                glist_getcanvas(c), tag, s->s_name);
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            gui_start_array();
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            for (i = 0; i < x->x_ndash; i++)
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                gui_f(fielddesc_getcoord(fd+i, template, data, 1));
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            gui_end_array();
            gui_end_vmess();
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        }
    }
    else if (s == gensym("data"))
    {
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        char tagbuf[MAXPDSTRING];
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        sprintf(tagbuf, "draw%lx.%lx",
            (long unsigned int)parent, (long unsigned int)data);
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        gui_start_vmess("gui_draw_configure", "xss",
            glist_getcanvas(c), tagbuf, "d"); 
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        /* let's turn off bbox caching so we can recalculate the bbox */
        if (x->x_pathrect_cache != -1)
           x->x_pathrect_cache = 0;
        *predraw_bbox = 1;
        int i;
        char *cmd;
        t_fielddesc *f;
        int totalpoints = 0; /* running tally */
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        /* start an array parameter */
        char cmdbuf[2];
        gui_start_array();
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        /* path parser: no error checking yet */
        for (i = 0, cmd = x->x_pathcmds; i < x->x_npathcmds; i++, cmd++)
        {
            int j;
            int cargs = x->x_nargs_per_cmd[i];
            f = (x->x_vec)+totalpoints;
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            sprintf(cmdbuf, "%c", *(cmd));
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            gui_s(cmdbuf);
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            for (j = 0; j < x->x_nargs_per_cmd[i]; j++)
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                gui_f(fielddesc_getcoord(
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                    f+j, template, data, 0));
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            totalpoints += x->x_nargs_per_cmd[i];
        }
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        gui_end_array();
        gui_end_vmess();
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    }
    else if (s == gensym("index"))
    {
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        gui_vmess("gui_drawimage_index", "xxxi",
            glist_getcanvas(c), parent, data, drawimage_getindex(parent, template, data));
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    }
    else if (s == gensym("points"))
    {
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        char tagbuf[MAXPDSTRING];
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        sprintf(tagbuf, "draw%lx.%lx",
            (long unsigned int)parent, (long unsigned int)data);
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        gui_start_vmess("gui_draw_coords", "xss",
            glist_getcanvas(c), tagbuf, x->x_type->s_name);
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        gui_start_array();
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        /* let's turn off bbox caching so we can recalculate the bbox */
        if (x->x_pathrect_cache != -1)
           x->x_pathrect_cache = 0;
        *predraw_bbox = 1;
        int i;
        t_fielddesc *f = x->x_vec;
        if (x->x_type == gensym("rect") ||
            x->x_type == gensym("ellipse"))
        {
            t_float xval, yval, w, h;
            xval = fielddesc_getcoord(f, template, data, 1);
            yval = fielddesc_getcoord(f+1, template, data, 1);
            if (x->x_type == gensym("rect"))
            {
                w = xval + (fielddesc_getcoord(f+2, template, data, 1));
                h = yval + (fielddesc_getcoord(f+3, template, data, 1));
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                gui_f(xval);
                gui_f(yval);
                gui_f(w);
                gui_f(h);
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            }
            else
            {
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                gui_f(xval);
                gui_f(yval);
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            }
        }
        else
        {
            int n = (x->x_type == gensym("circle")) ? 2 : x->x_nargs;
            for (i = 0; i < n; i++)
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                gui_f(fielddesc_getcoord(f+i, template, data, 1));
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        }
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        gui_end_array();
        gui_end_vmess();
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    }
}

void svg_updatevec(t_canvas *c, t_word *data, t_template *template,
    t_template *target, void *parent, t_symbol *s, t_svg *x, t_scalar *sc,
    int *predraw_bbox)
{
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    // post("updateing vec...");
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    int i, j;
    for (i = 0; i < template->t_n; i++)
    {
        if (template->t_vec[i].ds_type == DT_ARRAY)
        {
            int arrayonset, type, elemsize;
            t_symbol *targetsym = target->t_sym, *elemtemplatesym;
            t_array *array;
            char *elem;
            if (!template_find_field(template, ((template->t_vec)+i)->ds_name,
                &arrayonset, &type, &elemtemplatesym))
            {
                error("draw: problem finding array...");
                return;
            }

            t_template *elemtemplate = template_findbyname(elemtemplatesym);
            t_canvas *elemtemplatecanvas = template_findcanvas(elemtemplate);
            /* this is a doozy... */
            array = *(t_array **)(((char *)data) + arrayonset);
            elem = (char *)array->a_vec;

            if (elemtemplatesym == targetsym)
            {
                elemsize = array->a_elemsize;
                for (j = 0; j < array->a_n; j++)
                {
                        int redraw_bbox = 0;
                        svg_sendupdate(x, glist_getcanvas(c), s,
                            elemtemplate, (t_word *)(elem + elemsize * j),
                            predraw_bbox, parent, sc);
                }
            }
            svg_updatevec(c, (t_word *)elem, elemtemplate, target, parent,
                s, x, sc, predraw_bbox);
        }
    }
}

/* todo: i think svg_togui and this are unnecessarily duplicating code... */
extern void scalar_select(t_gobj *z, t_glist *owner, int state);
t_template *canvas_findtemplate(t_canvas *c);
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void svg_doupdate(t_svg *x, t_canvas *c, t_symbol *s)
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{
    t_gobj *g;
    t_template *template;
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    t_canvas *visible = c;
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    void *parent = x->x_parent;
    t_canvas *parentcanvas =
        canvas_templatecanvas_forgroup(svg_parentcanvas(x));
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    t_template *parenttemplate = canvas_findtemplate(parentcanvas);
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    int redraw_bbox = 0;
     /* "visible" is here because we could be drawn in a gop, in
       which case we must "climb" out to the parent canvas on
       which we are drawn. There's probably a function somewhere
       that abstracts this away... */
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    while(visible->gl_isgraph && visible->gl_owner)
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        visible = visible->gl_owner;
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    for (g = c->gl_list; g; g = g->g_next)
    {
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        if (glist_isvisible(c) && g->g_pd == scalar_class)
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        {
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            template = template_findbyname((((t_scalar *)g)->sc_template));
            /* still kinda hacky-- redrawbbox side-effect is weird */
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            t_word *data = ((t_scalar *)g)->sc_vec;
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            if (parenttemplate == template)
            { 
                svg_sendupdate(x, visible, s, template,
                    data, &redraw_bbox, parent, (t_scalar *)g);
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            }
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            else
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            {
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                if (template_has_elemtemplate(template, parenttemplate))
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                {
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                    svg_updatevec(c, ((t_scalar *)g)->sc_vec, template,
                        parenttemplate, parent, s, x, (t_scalar *)g,
                        &redraw_bbox);
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                }
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            }
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            if (redraw_bbox)
            {
                /* uncache the scalar's bbox */
                ((t_scalar *)g)->sc_bboxcache = 0;
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                /* only get the scroll if we had to redraw the bbox */
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