openFrameworks MIDI send to Launchpad sample

main.cpp

#include "ofMain.h"
#include "ofApp.h"

int main( ){
    ofSetupOpenGL(320, 320 , OF_WINDOW);
    ofRunApp(new ofApp());
}

ofApp.cpp

#include "ofApp.h"

const int midiMap[] = {
  0,    1,   2,   3,   4,   5,   6,   7,
  16,  17,  18,  19,  20,  21,  22,  23,
  32,  33,  34,  35,  36,  37,  38,  39,
  48,  49,  50,  51,  52,  53,  54,  55,
  64,  65,  66,  67,  68,  69,  70,  71,
  80,  81,  82,  83,  84,  85,  86,  87,
  96,  97,  98,  99,  100, 101, 102, 103,
  112, 113, 114, 115, 116, 117, 118, 119
};

void ofApp::setup() {
    // MIDI Setup
    midiOut.listPorts();
    midiOut.openPort("Launchpad");
}

void ofApp::draw() {
    // Draw grid line
    int w = ofGetWidth() / 8;
    int h = ofGetHeight() / 8;
    for (int i=0; i<8; i++) {
        ofDrawLine(w*i, 0, w*i, ofGetHeight());
        ofDrawLine(0, h*i, ofGetWidth(), h*i);
    }
}

void ofApp::keyReleased(int key) {
    switch(key) {
    case ' ':
        // Reset
        midiOut.sendControlChange(1, 0, 0);
        break;
    }
}

void ofApp::mouseDragged(int x, int y, int button) {
    int w = x / (ofGetWidth() / 8);
    int h = y / (ofGetHeight() / 8);
    int key = ofClamp(8*h+w, 0, 63);
    int channel = 1;
    int velocity = 127;

    midiOut.sendNoteOn(channel, midiMap[key], velocity);
}

ofApp.h

#pragma once

#include "ofMain.h"
#include "ofxMidi.h"

class ofApp : public ofBaseApp {
 public:
    void setup();
    void draw();
    void keyReleased(int key);
    void mouseDragged(int x, int y, int button);

 private:
    ofxMidiOut midiOut;
};