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Index › Programming Questions & Help › Sound,  Music Libraries › How to use Midi Controller for Graphics
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How to use Midi Controller for Graphics? (Read 1189 times)
Miamiamiam
How to use Midi Controller for Graphics?
Mar 6th, 2010, 3:51pm  
Hello All,

Im working on a sound visualisation project and I just bought a Korg nano Kontrol, thinking that i could tweak some of my code graphical values with it.
Im a total amateur, and maybe its just a lexical problem, but i couldnt find anything to show me the way. Can someone orient me on a library  or just simply post a code that would change the background from black to white using a midi controler?
thanks in advance
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Miamiamiam
Re: How to use Midi Controller for Graphics?
Reply #1 - Mar 7th, 2010, 4:40am  
Ok guys,

I think Im getting closer, using the Midibus library. Here is the code, im trying to change the ellipse fill color using my sliders and knobs. I can see it prints correct values, but the ellipse doesnt seem to react. I also dont know how to assign tasks to specific knobs and sliders.

Quote:
import themidibus.*; //Import the library

MidiBus myBus; // The MidiBus

void setup() {
     size(400,400);
     background(0);
     MidiBus.list();
     myBus = new MidiBus(this, "nanoKONTROL 1 SLIDER/KNOB", "nanoKONTROL 1 CTRL"); //
}

void draw() {
     int channel = 0;
     int number = 0;
     int value = 90;
       
      fill(value, value, 0);      
      ellipse(200,200,90,90);

     myBus.sendControllerChange(channel, number, value); // Send a controllerChange
}

void controllerChange(int channel, int number, int value) {
     // Receive a controllerChange
     println();
     println("Channel:"+channel);
     println("Number:"+number);
     println("Value:"+value);
}


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antiplastik
Re: How to use Midi Controller for Graphics?
Reply #2 - Mar 7th, 2010, 4:47am  
I guess your code should be :

Code:
import themidibus.*;

MidiBus myBus;
color controllerValue = 0;

void setup() {
  size(400,400);
  background(0);
  MidiBus.list();
  myBus = new MidiBus(this, "nanoKONTROL 1 SLIDER/KNOB", "nanoKONTROL 1 CTRL");
}

void draw() {
  fill(controllerValue, controllerValue, 0);      
  ellipse(200,200,90,90);
}

void controllerChange(int channel, int number, int value) {
  controllerValue = value;
}


To listen to a specific controller, just do a conditional test in the controllerChange() method :

Code:
void controllerChange(int channel, int number, int value) {
  switch(number) {
    case 1:
      // controller #1
      // do something
      break;
    case 2:
      // controller #2
      // do something
      break;
  }
}
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Miamiamiam
Re: How to use Midi Controller for Graphics?
Reply #3 - Mar 7th, 2010, 8:20am  

Thanks Antiplastik,
its working perfectly.
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