getdollarzero can get the dollar zero of any parent. For example, lets say a patch called "top" contains the abstraction 1. The abstraction 1 contains the abstraction 2. The abstraction 2 contains the abstraction 3. Well, with getdollarzero, abstraction 1 through 3 can know the dollar zero of the patch "top". The patch "top" becomes the "root" patch. All the abstractions 1 through 3 have in common this "root" patch.
This is what I needed it for:
- I am currently developing a state saving system that does not require the
"$0" arguments (of Memento for example). The state of all elements that have the same "root" patch are saved together. 2) I am also creating a timing architecture for PD and I wanted all elements in the same "root" to be synchronized together.
Tom
On 8/29/07, Hans-Christoph Steiner hans@eds.org wrote:
Hey,
I think Günter didn't want to depend on non-public headers like g_canvas.h, so included the glist struct from that header. Personally, I think makes more sense to include the g_canvas.h header.
[parentdollarzero] like a useful object, I am not usre what [getdollarzero] does beyond [float $0] or [$0]. Anyway, hopefully they make into Pd-extended.
.hc
On Aug 27, 2007, at 4:43 PM, Thomas O Fredericks wrote:
Thanks to Han's help page (http://puredata.info/docs/developer/mingw) I was able to compile a test external on windows with mingw.
I then started making a new external called getdollarzero based on getdir (from ggee) and parentdollarzero (from iemlib2). I compiled it and it works but I had to:
- remove Guenter's hack from getdir's source code
- and therefore include g_canvas.h
My question is the following: why is there a hack in the first place? If I do not use it will my code crash PD in some way (I compiled against PD 0.4and worked fine during testing)?
As a reference, here is my code with the hack commented out :
--------- getdollarzero --------
#include "m_pd.h" #include "g_canvas.h" //needed to include g_canvas.h once the hack was commented out
/* HACK struct _glist { t_object gl_obj; // header in case we're a glist t_gobj *gl_list; // the actual data struct _gstub *gl_stub; // safe pointer handler int gl_valid; // incremented when pointers might be stale struct _glist *gl_owner; // parent glist, supercanvas, or 0 if none };
END HACK */
typedef struct getdollarzero { t_object x_ob; t_canvas * x_canvas; t_outlet* x_outlet; int x_level; } t_getdollarzero;
static void getdollarzero_bang(t_getdollarzero *x) { int i = x->x_level; t_canvas* last = x->x_canvas;
while (i>0) { i--; if (last->gl_owner) last = last->gl_owner; } // code example taken from iemlib2's parentdollarzero: // x->s_parent_unique = canvas_realizedollar((t_canvas*)this_canvas->gl_owner, gensym("$0")); // original get dir function: //outlet_symbol(x->x_outlet,canvas_getdir(last));
outlet_symbol(x->x_outlet,canvas_realizedollar(last, gensym("$0")));}
t_class *getdollarzero_class;
static void *getdollarzero_new(t_floatarg level) { t_getdollarzero *x = (t_getdollarzero *)pd_new(getdollarzero_class); x->x_canvas = canvas_getcurrent(); x->x_outlet = outlet_new(&x->x_ob, &s_); x->x_level = level; return (void *)x; }
void getdollarzero_setup(void) { getdollarzero_class = class_new(gensym("getdollarzero"), (t_newmethod)getdollarzero_new, 0, sizeof(t_getdollarzero), 0, A_DEFFLOAT,0); class_addbang(getdollarzero_class, getdollarzero_bang); }
--------- getdollarzero end --------
-- thomas ouellet fredericks, tof@danslchamp.org, montreal, canada _______________________________________________ PD-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
Computer science is no more related to the computer than astronomy is related to the telescope. -Edsger Dykstra