PadKit for Processing. Use Processing with your Novation Launchpad MKII.

PadKit.pde

import themidibus.*;
import javax.sound.midi.MidiMessage;
MidiBus myBus;
PKColor padColor;
PKManager pm;

// PadKit, PKManager and all subclasses in this project are owned by Ben Myers.
// Project initated 11/19/2018
// Latest update 11/21/2018
// Current version 1.2

// PKManager creates points and shapes on the Launchpad.
// Make sure to run definePadArrays() in setup().
// midiMessage(message, timestamp, bus_name) is called whenever a button is pressed on the Launchpad. You can put handlers inside that function.

String launchpadName;
Pad[] padList = new Pad[99];
Pad[][] padGrid;

int tick = 0;
int tick2 = 5;

private void definePadArrays() {
  int counter = 11;
  for(int i = 0; i < 94; i++) {
    padList[i] = new Pad(i);
    while(counter % 10 != 0) counter++;
  }
  padList[91] = new Pad(104);
  padList[92] = new Pad(105);
  padList[93] = new Pad(106);
  padList[94] = new Pad(107);
  padList[95] = new Pad(108);
  padList[96] = new Pad(109);
  padList[97] = new Pad(110);
  padList[98] = new Pad(111);
}

PKCoordinate touchCoordinate;
void midiMessage(MidiMessage message, long timestamp, String bus_name) { 
  int note = (int)(message.getMessage()[1] & 0xFF);
  int vel = (int)(message.getMessage()[2] & 0xFF);
  
  if(note <= 89) {
    touchCoordinate = new PKCoordinate(note % 10 - 1, floor(note / 10) - 1);
  } else {
    touchCoordinate = new PKCoordinate(note - 104, 8);
  }
  
  print("Pad touched");
  
  for(int i = 0; i < padList.length; i++) {
    if(padList[i].noteAssignment == note) {
      if(vel == 0) { padList[i].isPressed = false; padList[i].padTouchUp(); }
      else { padList[i].isPressed = true; padList[i].padTouchDown(); }
    }
  }
  
  //if(vel == 0) padReleased(note);
  //else padTouched(note, vel);
}

void testLights() {
  padList[tick].on(tick2, (floor(random(0,2)) == 0));
  padList[tick].on(tick2);
  
  tick += 1;
  if(tick >= 99) { tick = 0; tick2 += 4; }
  if(tick2 > 57) {
    tick2 = 5;
  }
}

class PKColor {
  
  int colorNum = 3;
  
  PKColor(String colorName) {
    int toAdd = 0;
    /*if(colorName.substring(0,4).equalsIgnoreCase("DARK")) toAdd = 1;
    if(colorName.substring(0,6).equalsIgnoreCase("DARKER")) toAdd = 2;
    if(colorName.substring(0,5).equalsIgnoreCase("LIGHT")) toAdd = -1;*/
    if(colorName.equalsIgnoreCase("DARKGRAY")) colorNum =  1;
    if(colorName.equalsIgnoreCase("GRAY")) colorNum =  2;
    if(colorName.equalsIgnoreCase("WHITE")) colorNum =  3;
    if(colorName.equalsIgnoreCase("RED")) colorNum =  5 + toAdd;
    if(colorName.equalsIgnoreCase("ORANGE")) colorNum =  9 + toAdd;
    if(colorName.equalsIgnoreCase("YELLOW")) colorNum =  13 + toAdd;
    if(colorName.equalsIgnoreCase("CHARTREUSE")) colorNum =  17 + toAdd;
    if(colorName.equalsIgnoreCase("LIME")) colorNum =  21 + toAdd;
    if(colorName.equalsIgnoreCase("GREEN")) colorNum =  25 + toAdd;
    if(colorName.equalsIgnoreCase("AQUA")) colorNum =  29 + toAdd;
    if(colorName.equalsIgnoreCase("TEAL")) colorNum =  33 + toAdd;
    if(colorName.equalsIgnoreCase("SKY")) colorNum =  37 + toAdd;
    if(colorName.equalsIgnoreCase("BLUE")) colorNum =  41 + toAdd;
    if(colorName.equalsIgnoreCase("INDIGO")) colorNum =  45 + toAdd;
    if(colorName.equalsIgnoreCase("PURPLE")) colorNum =  49 + toAdd;
    if(colorName.equalsIgnoreCase("VIOLET")) colorNum =  53 + toAdd;
    if(colorName.equalsIgnoreCase("MAGENTA")) colorNum =  57 + toAdd;
    if(colorName.equalsIgnoreCase("PINK")) colorNum =  56;
  }
  
  PKColor(int _colorNum) {
    colorNum = _colorNum;
  }
}

class PKCoordinate {
  int toNote = 0;
  int x;
  int y;
  
  PKCoordinate(int _x, int _y) {
    toNote = (_y+1)*10 + _x + 1;
    x = _x;
    y = _y;
  }
  
  boolean equals(PKCoordinate a) {
    if(a.x == this.x && a.y == this.y) {
      return true;
    } else return false;
  }
}

class PKManager {
  PKManager() {}
  
  int fillColor = 1;
  void fill(PKColor c) {
    fillColor = c.colorNum;
  }
  
  boolean doShimmer = false;
  void shimmer() {
    doShimmer = true;
  }
  
  void noShimmer() {
    doShimmer = false;
  }
  
  int deltaColor = 0;
  void tint(int amount) {
    deltaColor = amount;
    fillColor += amount;
  }
  
  void noTint() {
    fillColor -= deltaColor;
    deltaColor = 0;
  }
  
  void point(PKCoordinate p) {
    padList[p.toNote].on(fillColor, doShimmer);
  }
  
  void setPressedColorOf(PKCoordinate p, PKColor c) {
    padList[p.toNote].setPressedColor(c.colorNum);
  }
  
  void background(PKColor c) {
    for(int i = 0; i < padList.length; i++) {
      padList[i].on(c.colorNum);
    }
  }
}

class Pad {
  int noteAssignment;
  boolean isPressed;
  boolean isOn;
  int currentVel;
  int pressedColor;
  
  Pad(int assignToNote) {
    noteAssignment = assignToNote;
    isPressed = false;
    isOn = false;
    currentVel = 0;
  }
  
  void on(int c) {
    isOn = true;
    currentVel = c;
    if(noteAssignment < 104) {
      myBus.sendNoteOn(0, noteAssignment, c);
    } else {
      myBus.sendMessage(176, noteAssignment, c);
    }
  }
  public void on(int c, boolean shimmer) {
    isOn = true;
    currentVel = c;
    if(shimmer && noteAssignment < 104) {
      myBus.sendNoteOn(2, noteAssignment, c);
    } else {
      if(noteAssignment < 91) {
        myBus.sendNoteOn(0, noteAssignment, c);
      } else {
        if(!shimmer) {
          myBus.sendMessage(176, noteAssignment, c);
        } else if(floor(millis() / 50) % 20 < 10) {
          myBus.sendMessage(176, noteAssignment, c);
        } else {
          myBus.sendMessage(176, noteAssignment, 0);
        }
      }
    }
  }
  public void off() {
    isOn = false;
    if(noteAssignment < 91) {
      myBus.sendNoteOff(0, noteAssignment, 0);
    } else {
      myBus.sendMessage(176, noteAssignment, 0);
    }
  }
  
  void setPressedColor(int c) {
    pressedColor = c;
  }
  
  void padTouchDown() {
    on(pressedColor);
  }
  
  void padTouchUp() {
    
  }
}