g_canvas.c 65.4 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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    /* 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);

/* --------- 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;

static void glist_doupdatewindowlist(t_glist *gl, char *sbuf)
{
    t_gobj *g;
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    if (glist_amreloadingabstractions)  /* not if we're in a reload */
        return;
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    if (!gl->gl_owner)
    {
        /* this is a canvas; if we have a window, put on "windows" list */
        t_canvas *canvas = (t_canvas *)gl;
        if (canvas->gl_havewindow)
        {
            if (strlen(sbuf) + strlen(gl->gl_name->s_name) + 100 <= 1024)
            {
                char tbuf[1024];
                sprintf(tbuf, "{{%s} .x%lx} ", gl->gl_name->s_name,
                    (t_int)canvas);
                strcat(sbuf, tbuf);
            }
        }
    }
    for (g = gl->gl_list; g; g = g->g_next)
    {
        if (pd_class(&g->g_pd) == canvas_class)
            glist_doupdatewindowlist((t_glist *)g, sbuf);
    }
    return;
}

    /* maintain the list of visible toplevels for the GUI's "windows" menu */
void canvas_updatewindowlist( void)
{
    t_canvas *x;
    char sbuf[1024];
    strcpy(sbuf, "set menu_windowlist {");
        /* find all root canvases */
    for (x = canvas_list; x; x = x->gl_next)
        glist_doupdatewindowlist(x, sbuf);
    /* next line updates the window menu state before -postcommand tries it */
    strcat(sbuf, "}\npdtk_fixwindowmenu\n");
    sys_gui(sbuf);
}

    /* 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;
}

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)
{
    char *dir = canvas_getenv(x)->ce_dir->s_name;
    if (file[0] == '/' || (file[0] && file[1] == ':') || !*dir)
    {
        strncpy(result, file, resultsize);
        result[resultsize-1] = 0;
    }
    else
    {
        int nleft;
        strncpy(result, dir, resultsize);
        result[resultsize-1] = 0;
        nleft = resultsize - strlen(result) - 1;
        if (nleft <= 0) return;
        strcat(result, "/");
        strncat(result, file, nleft);
        result[resultsize-1] = 0;
    }           
}

void canvas_rename(t_canvas *x, t_symbol *s, t_symbol *dir)
{
    if (strcmp(x->gl_name->s_name, "Pd"))
        pd_unbind(&x->gl_pd, canvas_makebindsym(x->gl_name));
    x->gl_name = s;
    if (strcmp(x->gl_name->s_name, "Pd"))
        pd_bind(&x->gl_pd, canvas_makebindsym(x->gl_name));
    if (glist_isvisible(x))
        canvas_reflecttitle(x);
    if (dir && dir != &s_)
    {
        t_canvasenvironment *e = canvas_getenv(x);
        e->ce_dir = dir;
    }
}

/* --------------- 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;

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//static void canvas_manual_pd_free(t_canvas *x) {
//	sys_flushtogui();
//	pd_free(&x->gl_pd);
//}

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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);
}

    /* 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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	/*	first alloc one byte or redundant memory to prevent creation of objects with the same "name"
		which leads to double-action invoked from every single action and eventually possible crashes

		we keep a list of these redundant allocations and destroy them when pd quits */
	//if (x->gl_owner && x->gl_env) {
/*
		t_redundant_mem *new_rm = (t_redundant_mem *)t_getbytes(sizeof(*new_rm));
		new_rm->rm_what = (int)getbytes(1);
		if (rm_start == NULL) {
			//fprintf(stderr,"first allocation\n");
			rm_start = new_rm;
			rm_end = new_rm;
		}
		else if (rm_start == rm_end) {
			//fprintf(stderr,"second allocation\n");
			rm_end = new_rm;
			rm_start->rm_next = rm_end;
		}
		else {
			//fprintf(stderr,"allocation\n");
			rm_end->rm_next = new_rm;
			rm_end = new_rm;
		}
*/
	//}

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    t_canvas *x = (t_canvas *)pd_new(canvas_class);
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	/* now that we've created a new canvas, add canvas info to the new_rm */
	//new_rm->rm_canvas = x;

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    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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    // jsarlo
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    x->gl_magic_glass = magicGlass_new(x);
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    // end jsarlo
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	//if we are root canvas set the clock for script based destructor of the window
	//if (!owner) {
	//	x->gl_destroy = clock_new(x, (t_method)canvas_manual_pd_free);
	//}

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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")));
    if (strcmp(x->gl_name->s_name, "Pd"))
        pd_bind(&x->gl_pd, canvas_makebindsym(x->gl_name));
    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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    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 -------------------------------- */
	//resize blob	
	t_scalehandle *sh;
	char buf[64];
	x->x_handle = pd_new(scalehandle_class);
	sh = (t_scalehandle *)x->x_handle;
	sh->h_master = (t_gobj*)x;
	sprintf(buf, "_h%lx", (t_int)sh);
	pd_bind(x->x_handle, sh->h_bindsym = gensym(buf));
	sprintf(sh->h_outlinetag, "h%lx", (t_int)sh);
	sh->h_dragon = 0;
	sh->h_scale = 1;
	x->scale_offset_x = 0;
	x->scale_offset_y = 0;
	x->scale_vis = 0;
	
	//move blob	
	t_scalehandle *mh;
	char mbuf[64];
	x->x_mhandle = pd_new(scalehandle_class);
	mh = (t_scalehandle *)x->x_mhandle;
	mh->h_master = (t_gobj*)x;
	sprintf(mbuf, "_h%lx", (t_int)mh);
	pd_bind(x->x_mhandle, mh->h_bindsym = gensym(mbuf));
	sprintf(mh->h_outlinetag, "h%lx", (t_int)mh);
	mh->h_dragon = 0;
	mh->h_scale = 0;
	x->move_offset_x = 0;
	x->move_offset_y = 0;
	x->move_vis = 0;
/*------------------------------------------------------------- */

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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;
    if (strcmp(x->gl_name->s_name, "Pd"))
        pd_bind(&x->gl_pd, canvas_makebindsym(x->gl_name));
    x->gl_owner = g;
    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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	sys_vgui("pdtk_canvas_getscroll .x%lx.c\n", (long unsigned int)glist_getcanvas(g));
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    return (x);
}

    /* 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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	pd_vmess(&g->gl_pd, gensym("editmode"), "i", 1);
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    t_symbol *sym = atom_getsymbolarg(0, argc, argv);
	/* 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);
}

    /* 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)
{
  return (x->gl_isgraph|(x->gl_hidetext<<1));
}

    /* 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));
}

void canvas_reflecttitle(t_canvas *x)
{
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	//fprintf(stderr,"canvas_reflecttitle\n");
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    char namebuf[MAXPDSTRING];
    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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#ifdef __APPLE__
    sys_vgui("wm attributes .x%lx -modified %d -titlepath {%s/%s}\n",
        x, x->gl_dirty, canvas_getdir(x)->s_name, x->gl_name->s_name);
    sys_vgui("wm title .x%lx {%s%s}\n", x, x->gl_name->s_name, namebuf);
#else
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	//if(glist_havewindow(x) || !x->gl_isgraph || x->gl_isgraph && x->gl_havewindow || x->gl_loading || x->gl_dirty) {
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		/*fprintf(stderr,"%d %d %d %d %d\n", glist_istoplevel(x), !x->gl_isgraph,
			x->gl_isgraph && x->gl_havewindow, x->gl_loading,
			x->gl_dirty);*/
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	sys_vgui("catch { wm title .x%lx {%s%c%s - %s} }\n", 
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	        x, x->gl_name->s_name, (x->gl_dirty? '*' : ' '), namebuf,
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            canvas_getdir(x)->s_name);
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	//}
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#endif
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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 (glist_isvisible(x2))
            canvas_reflecttitle(x2);
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    }
}

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/*********** dpsaha@vt.edu resize move hooks ****************/
void canvas_draw_gop_resize_hooks(t_canvas* x)
{
	if(x->gl_edit){
		
		//Drawing and Binding Resize_Blob for GOP
		t_scalehandle *sh = (t_scalehandle *)(x->x_handle);
		sprintf(sh->h_pathname, ".x%lx.h%lx", (t_int)x, (t_int)sh);
		sys_vgui("destroy %s\n", sh->h_pathname);		
		sys_vgui("canvas %s -width %d -height %d -bg $select_color -bd 0 -cursor bottom_right_corner\n",
				 sh->h_pathname, SCALEHANDLE_WIDTH, SCALEHANDLE_HEIGHT);
		sys_vgui(".x%x.c create window %d %d -anchor nw -width %d -height %d -window %s -tags {%lxSCALE %lxGOP GOP_resblob}\n",
				 x, x->gl_xmargin + x->gl_pixwidth - SCALEHANDLE_WIDTH - 1,
				 x->gl_ymargin + 3 + x->gl_pixheight - SCALEHANDLE_HEIGHT - 4,
				 SCALEHANDLE_WIDTH, SCALEHANDLE_HEIGHT,
				 sh->h_pathname, x, x);
		
		sys_vgui("bind %s <Button> {pd [concat %s _click 1 %%x %%y \\;]}\n",
				 sh->h_pathname, sh->h_bindsym->s_name);
		sys_vgui("bind %s <ButtonRelease> {pd [concat %s _click 0 0 0 \\;]}\n",
				 sh->h_pathname, sh->h_bindsym->s_name);
		sys_vgui("bind %s <Motion> {pd [concat %s _motion %%x %%y \\;]}\n",
				 sh->h_pathname, sh->h_bindsym->s_name);

		//Drawing and Binding Move_Blob for GOP
		t_scalehandle *mh = (t_scalehandle *)(x->x_mhandle);
		sprintf(mh->h_pathname, ".x%lx.h%lx", (t_int)x, (t_int)mh);
		sys_vgui("destroy %s\n", mh->h_pathname);		
		sys_vgui("canvas %s -width %d -height %d -bg $select_color -bd 0 -cursor crosshair\n",
				 mh->h_pathname, SCALEHANDLE_WIDTH, SCALEHANDLE_HEIGHT);
		sys_vgui(".x%x.c create window %d %d -anchor nw -width %d -height %d -window %s -tags {%lxMOVE %lxGOP GOP_movblob}\n",
				 x, x->gl_xmargin + 2 ,
				 x->gl_ymargin + 2 ,
				 SCALEHANDLE_WIDTH, SCALEHANDLE_HEIGHT,
				 mh->h_pathname, x, x);
		
		sys_vgui("bind %s <Button> {pd [concat %s _click 1 %%x %%y \\;]}\n",
				 mh->h_pathname, mh->h_bindsym->s_name);
		sys_vgui("bind %s <ButtonRelease> {pd [concat %s _click 0 0 0 \\;]}\n",
				 mh->h_pathname, mh->h_bindsym->s_name);
		sys_vgui("bind %s <Motion> {pd [concat %s _motion %%x %%y \\;]}\n",
				 mh->h_pathname, mh->h_bindsym->s_name);

	}
	else{
		sys_vgui(".x%lx.c delete GOP_resblob\n",x);					//delete the GOP_resblob
		sys_vgui(".x%lx.c delete GOP_movblob\n",x);					//delete the GOP_movblob	
	}
}
/*****************************************************************************/

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void canvas_drawredrect(t_canvas *x, int doit)
{
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    if (doit){
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        sys_vgui(".x%lx.c create line\
            %d %d %d %d %d %d %d %d %d %d -fill #ff8080 -tags GOP\n",
            glist_getcanvas(x),
            x->gl_xmargin, x->gl_ymargin,
            x->gl_xmargin + x->gl_pixwidth, x->gl_ymargin,
            x->gl_xmargin + x->gl_pixwidth, x->gl_ymargin + x->gl_pixheight,
            x->gl_xmargin, x->gl_ymargin + x->gl_pixheight,
            x->gl_xmargin, x->gl_ymargin);
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		if (x->gl_goprect && x->gl_edit){
				canvas_draw_gop_resize_hooks(x);					//dpsaha@vt.edu for drawing the GOP_blobs
		}	
	}
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    else sys_vgui(".x%lx.c delete GOP\n",  glist_getcanvas(x));
}

    /* 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\n");
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    int flag = (f != 0);
    t_gobj *y;
    if (flag)
    {
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		//fprintf(stderr,"canvas_map 1\n");
        //if (!glist_isvisible(x))
        //{
			//fprintf(stderr,"canvas_map 1 isvisible\n");
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        t_selection *sel;
        if (!x->gl_havewindow)
        {
            bug("canvas_map");
            canvas_vis(x, 1);
        }

		if (!x->gl_list) {
			//if there are no objects on the canvas
			canvas_create_editor(x);
		}
        else for (y = x->gl_list; y; y = y->g_next) {
            gobj_vis(y, x, 1);
			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);
		}
        x->gl_mapped = 1;
        canvas_drawlines(x);
        if (x->gl_isgraph && x->gl_goprect)
            canvas_drawredrect(x, 1);
        sys_vgui("pdtk_canvas_getscroll .x%lx.c\n", x);
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        //}
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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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			sys_vgui(".x%lx.c dtag all selected\n", x);
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            sys_vgui(".x%lx.c delete all\n", x);
            x->gl_mapped = 0;
        }
    }
}

void canvas_redraw(t_canvas *x)
{
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	//fprintf(stderr,"canvas_redraw\n");
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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;
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		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)
{
    if (glist_isvisible(x) && !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
        {
                /* erase ourself in parent window */
            gobj_vis(&x->gl_gobj, gl2, 0);
                    /* get rid of our editor (and subeditors) */
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            if (x->gl_editor)
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                canvas_destroy_editor(x);
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            x->gl_havewindow = 1;
                    /* redraw ourself in parent window (blanked out this time) */
            gobj_vis(&x->gl_gobj, gl2, 1);
        }
    }
    canvas_vis(x, 1);
}

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

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);
}

void canvas_free(t_canvas *x)
{
    t_gobj *y;
    int dspstate = canvas_suspend_dsp();
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    if (x->gl_magic_glass)
      magicGlass_free(x->gl_magic_glass);
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    canvas_noundo(x);
    if (canvas_editing == x)
        canvas_editing = 0;
    if (canvas_whichfind == x)
        canvas_whichfind = 0;
    glist_noselect(x);
    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 (strcmp(x->gl_name->s_name, "Pd"))
        pd_unbind(&x->gl_pd, canvas_makebindsym(x->gl_name));
    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));
    }
    canvas_resume_dsp(dspstate);
    glist_cleanup(x);
    gfxstub_deleteforkey(x);        /* probably unnecessary */
    if (!x->gl_owner)
        canvas_takeofflist(x);
}

/* ----------------- 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);
        sys_vgui(".x%lx.c create line %d %d %d %d -width %d -fill %s \
-tags {l%lx all_cords}\n",
                 glist_getcanvas(x), t.tr_lx1, t.tr_ly1, t.tr_lx2, t.tr_ly2, 
                 (issignal ? 2:1), (issignal ? "$signal_cord" : "$msg_cord"),
                 oc);
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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)
        {
            sys_vgui(".x%lx.c coords l%lx %d %d %d %d\n",
                glist_getcanvas(x), oc,
                    t.tr_lx1, t.tr_ly1, t.tr_lx2, t.tr_ly2);
        }
    }
}

    /* 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)
        {
            if (x->gl_editor)
            {
                sys_vgui(".x%lx.c delete l%lx\n",
                    glist_getcanvas(x), oc);
            }
            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 */
void canvas_eraselinesfor(t_canvas *x, t_text *text)
{
    t_linetraverser t;