Getting one Slider or Knob to do something specific

Contributed Library Questions

njitram

Getting one Slider or Knob to do something specific

in Contributed Library Questions • 2 years ago

So for example i have 8 ellipses in my sketch, and i have 8 knobs on my midi (NANO Kontrol 2)

How can i move them seperately with the 8 knobs?

Like Knob 1 moves Ellipse 1, Knob 2 moves Ellipse 2, and so on ...

Now every knob or slider on my Midi Controller does the same.

I use the ProMIDI library

i can show you me sketch if you ask me, but its kinda big.

Replies(12)

phironn

Re: Getting one Slider or Knob to do something specific

2 years ago

You should post your code here.

In general, you should choose the MIDI channel you like to receive.

Any knob should send their position via one channel.

There is an example on the ProMIDI website:

example

-
Philipp Ronnenberg
Interaction design
-
http://www.phiron.de

njitram

Re: Re: Getting one Slider or Knob to do something specific

2 years ago

Yeah i thought it would have something to do with the MIDI channel, put cant seem to figure out how to specifically write it in code. And the example above isnt helping me as well, already saw it.

Im a beginner in processing and code language in general :)

Here is my sketch:

import promidi.*;

MidiIO midiIO;

int val = 0;
int num = 0;

void setup(){
size(128*5,128*5);
smooth();

midiIO = MidiIO.getInstance(this);
println("printPorts of midiIO");
midiIO.printDevices();
midiIO.openInput(1,0);
}

void controllerIn(
Controller controller,
int deviceNumber,
int midiChannel
){
num = controller.getNumber();
val = controller.getValue();
print(num);
}

void draw(){
background(0, 0, 0);
stroke(255);
fill(0, 0, 0);
strokeWeight(val/2);
ellipse(width/2,height/2,val*3,val*3);

strokeWeight(2);
ellipse(width/8*1-40,height/8,30,30);
ellipse(width/8*2-40,height/8,30,30);
ellipse(width/8*3-40,height/8,30,30);
ellipse(width/8*4-40,height/8,30,30);
ellipse(width/8*5-40,height/8,30,30);
ellipse(width/8*6-40,height/8,30,30);
ellipse(width/8*7-40,height/8,30,30);
ellipse(width/8*8-40,height/8,30,30);
}

those eight ellipses you see, I want to assign different knobs for.

Thanks for the comment!

njitram

Re: Getting one Slider or Knob to do something specific

2 years ago

As you can see, now i assign ALL the knobs and buttons and sliders from my midi to 1 ellipse, changing the radius and thickness of stroke when i turn them.

njitram

Re: Getting one Slider or Knob to do something specific

2 years ago

So what i need to do is take the 'val' number but specifically from 1 'num'.

But thats too far over my head :D

phironn

Re: Getting one Slider or Knob to do something specific

2 years ago

So you should see different numbers printing when rotating different knobs on your nano.

Copy code

void controllerIn(Controller controller, int deviceNumber, int midiChannel) {
num = controller.getNumber();
val = controller.getValue();
print(num); // <- this line should print the knobs number/note
}

If you see those numbers changing, while rotating different knobs you should be able to control single ellipses.

Copy code

if(num==1) do something with ellipse#1;

-
Philipp Ronnenberg
Interaction design
-
http://www.phiron.de

njitram

Re: Re: Getting one Slider or Knob to do something specific

2 years ago

if(num = 1);

ellipse(width/8*1-40,val,30,30);

'cannot convert from int to boolean'

njitram

Re: Getting one Slider or Knob to do something specific

2 years ago

And yeah the numbers are changing :)

njitram

Re: Getting one Slider or Knob to do something specific

2 years ago

oh tried it with == and then he opens the sketch but it doenst work.

still all the knobs move ellipse nr 1 around

njitram

Re: Getting one Slider or Knob to do something specific

2 years ago

yeah ok i'm a noob, shouldnt put the ; there

THANKS ALOT

this had bin a big braincrahs for me the last 2 days :D

njitram

Re: Re: Getting one Slider or Knob to do something specific

2 years ago

the only thing thats bothering me now is that he only can show 1 ellipse, but thats probalby because of the 'if'

phironn

Re: Getting one Slider or Knob to do something specific

2 years ago

Put this on top of your code:

Copy code

int[] values=new int[9];

Replace your controllerIn function:

Copy code

void controllerIn(Controller controller,int deviceNumber,int midiChannel) {
num = controller.getNumber();
val = controller.getValue();
print(num);
// check your current num's and set the numbers to your specific knob:
if(num==0) values[0] = val;
if(num==1) values[1] = val;
if(num==2) values[2] = val;
// etc.
}

Replace your current draw() with this:

Copy code

void draw() {
for(int i=0; i<9; i++) {
strokeWeight(values[i]/2);
ellipse(width/8*i-40,height/8,30,30);
}
}

-
Philipp Ronnenberg
Interaction design
-
http://www.phiron.de

njitram

Re: Getting one Slider or Knob to do something specific

2 years ago

thanks, looks complicated, will have a look though!

thanks for the help

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