[PD] Re: multi-speaker panning.. problamtic maths

[Frank Barknecht]

Hallo,
alexandre r. decoupigny hat gesagt: // alexandre r. decoupigny wrote:

> then i obviously still face some problems in the sketch:
> for example that the way it is set up, the patch only reacts
> if there is movement on both axis.. for example if i put
> the joystick all the way to the front and move it from left
> to right, nothing happens.. no idea how to deal with it..

This is because you have the triggering wrong in the part where you
convert the joystick coordinates to a degree value. 

Correct triggering is hard to get right until you get used to it, just
search the archives how often this is mentioned. I'd say it's the
most important next thing for you to learn in Pd. Really. 

I reworked that part of your patch and commented it a lot. I hope you
can follow it, but if there are more questions, please ask: Without
understanding trigger you will spend a lot of time hunting for
seemingly strange bugs in your patches.

Ciao
-- 
 Frank Barknecht                 _ ______footils.org_ __goto10.org__
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#N canvas 0 0 1230 661 10;
#X obj 67 178 joystick;
#X obj 65 117 tgl 15 0 empty on/off empty 0 -6 0 8 -262144 -1 -1 0
1;
#X floatatom 45 230 5 0 0 0 A - -;
#X floatatom 94 228 5 0 0 1 B - -;
#X msg 117 137 open 4;
#X obj 119 104 loadbang;
#X obj 47 267 * 2;
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#X obj 46 304 - 1;
#X obj 105 303 - 1;
#X floatatom 47 341 5 0 0 0 - - -;
#X floatatom 108 339 5 0 0 0 - - -;
#X obj 72 395 atan2;
#X floatatom 73 419 5 0 0 0 - - -;
#X floatatom 70 576 5 0 0 0 - - -;
#X obj 66 536 + 180;
#X obj 62 608 send joystick;
#X obj 56 469 rad2deg;
#X floatatom 58 504 5 0 0 0 - - -;
#X obj 125 557 s pack;
#X obj 144 200 s buttons;
#X obj 679 185 joystick;
#X obj 679 114 tgl 15 0 empty on/off empty 0 -6 0 8 -262144 -1 -1 0
1;
#X floatatom 611 236 5 0 0 0 A - -;
#X floatatom 742 236 5 0 0 1 B - -;
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#X obj 729 112 loadbang;
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#X floatatom 754 501 5 0 0 0 - - -;
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#X obj 659 622 send joystick;
#X obj 659 490 rad2deg;
#X floatatom 754 529 5 0 0 0 - - -;
#X obj 689 593 s pack;
#X obj 756 207 s buttons;
#X obj 63 33 cnv 15 100 60 empty empty You 20 12 0 14 -233017 -66577
0;
#X obj 574 39 cnv 15 100 60 empty empty Me 20 12 0 14 -233017 -66577
0;
#X text 696 42 A core thing to understand in Pd is the trigger-object
\, abbreviated [t]. It also will trigger from right to left and you
can use it to manually control triggering.;
#X obj 659 392 t b a;
#X obj 659 567 t a a;
#X floatatom 742 253 5 0 0 1 B - -;
#X floatatom 611 254 5 0 0 0 A - -;
#X obj 659 420 f;
#X text 817 526 <== Hint: remove all these debugging numbers later
\, they are performance hogs!;
#X text 158 231 Pd normally triggers outlets from right to left \,
so "A" will be triggered after "B";
#X text 134 365 Inlets also get read from right to left \, but generally
only the left-most inlet will actually generate any output. So everything
coming from number "A" above will have to wait for something coming
from "B" arriving a [atna2]'s left inlet first.;
#X text 134 448 But as "A" is triggered after "B" from the [joystick]
object \, you will always lag one coordinate pair behind!!;
#X text 754 369 Here the trigger is used to make the output of [joystick]
update the [atan2] correctly: The [f] just stores the "B"-coordinate
\, then the "A" coordinate will first be send out to the "a"nything
part of the [t b a] trigger \, and then it will "b"ang the [float]
that has the current "B" coordinate stored.;
#X text 752 459 Now the correct pair of A and B will arrive at the
[atan2] at the same time!;
#X text 775 601 [trigger] also should be used everywhere you have a
"fanning" outlet \, where more than one connection leaves. Make triggering
a habit!;
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