Markov Chain controlled music

int w, h, xpos, ypos, xa, xd;        //variables for width, height, mouse position and the left and right of each section

​

int num = 500;                       //size of arrays (number of ellipses) for visuals

int[] dx = new int[num];

int[] dy = new int[num];             //arrays for position and size of ellipses

int[] diam = new int[num];

​

import arb.soundcipher.*;            //imports soundcipher library

​

SoundCipher notes = new SoundCipher(this);

                                                //these create soundcipher instruments for notes and chords

SoundCipher chord = new SoundCipher(this);

​

void setup()

{

  size(1200, 760);                              //setting up the canvas

  background(40);

  smooth();

  frameRate(10);

  w = width; h = height;                          //assigning width and height to w and h

  drawLines();                                    //draws the lines and words from the start

  words();

  notes.instrument(39);                           //bass guitar instrument for notes

  chord.instrument(25);                           //steel string acoustic guitar for broken chords

 }

​

void draw()

{

  drawLines();       //draws the dividing lines

  xpos = mouseX; ypos = mouseY;                    //assigns mouse position to xpos and ypos

  float vel = map(ypos, 0, h, 30, 90);             //maps mouse y position to velocity of the notes

  background(40);

  drawLines();                                    //resets background and redraws lines and text every frame to cover up previous ellipses

  words();

​

  if (mousePressed == true) {

    if (xpos < w/6) {xa = 0; xd = w/6; ellipses(); notes.playNote(38, vel, 1.2);}

    else if (xpos < w/3) {xa = w/6; xd = w/3; ellipses(); notes.playNote(40, vel, 1.2);}                  //this section determines where the mouse is. this defines

    else if (xpos < w/2) {xa = w/3; xd = w/2; ellipses(); notes.playNote(41, vel, 1.2);}                  //values for xa and xd and calls the ellipse function to    

    else if (xpos < w - w/3) {xa = w/2; xd = w - w/3; ellipses(); notes.playNote(43, vel, 1.2);}          //draw the ellipses in the correct box

    else if (xpos < w - w/6) {xa = w - w/3; xd = w - w/6; ellipses(); notes.playNote(45, vel, 1.2);}

    else {xa = w - w/6; xd = w; ellipses(); notes.playNote(47, vel, 1.2);}

  }

  saveFrame();

}

​

void keyPressed()

{

  if (key == ' ') markovChords();                      //if the space bar is pressed, call the markov function which plays chords according to a markov chain

}

​

void words()                                          //this function prints all of the text to the canvas

{

  fill(200, 0, 100);

  textAlign(CENTER);

  textSize(20);

  text("Click to Play Notes!", w/2, h-35);

  text("Hold Space Bar to Play Chords!", w/2, h - 10);

  textSize(40);

  text("D", w/12, h - 90);

  text("E", 3*w/12, h - 90);

  text("F", 5*w/12, h - 90);

  text("G", 7*w/12, h - 90);

  text("A", 9*w/12, h - 90);

  text("B", 11*w/12, h - 90);

}

​

void markovChords()                                  //this function contains the markov chain whiach plays the chords

{

  if (frameCount % 5 == 0)                           //plays a new chord only every 5 frames

  {

    int last = 1;                                    //variable for last state of the state engine

    float r = random(1);                             //creates the random probabilities

    float[] chord1 = {48, 52, 55};    //Cmaj

    float[] chord2 = {53, 57, 60};    //Fmaj          //arrays for the three chords

    float[] chord3 = {55, 59, 60};    //Gmaj

    float[] dyn = {65, 70, 75};                       //these arrays define the velocity and duration of each respective note in the broken chord

    float[] dur = {0.2, 0.2, 0.3};

    switch(last)                                      //switches the last variable around

    {

      case 1:

      if (r < 0.2)

        {

          chord.playPhrase(chord1, dyn, dur);

          last = 1;

        }

        else if (r < 0.4)

        {

          chord.playPhrase(chord2, dyn, dur);

          last = 2;

        }

        else if (r < 0.8)

        {

        }

        else

        {

          chord.playPhrase(chord3, dyn, dur);

          last = 3;

        }

      break;

      case 2:

        if (r < 0.3)

        {

          chord.playPhrase(chord1, dyn, dur);

          last = 1;

        }

        else if (r < 0.5)

        {

          chord.playPhrase(chord2, dyn, dur);

          last = 2;

        }

        else if (r < 0.8) 

        {

        }

        else

        {

          chord.playPhrase(chord3, dyn, dur);

          last = 3;

        };

      break;

      case 3:

        if (r < 0.1)

        {

          chord.playPhrase(chord1, dyn, dur);

          last = 1;

        }

        else if (r < 0.3)

        {

          chord.playPhrase(chord2, dyn, dur);

          last = 2;

        }

        else if (r < 0.8) 

        {

        }

        else

        {

          chord.playPhrase(chord3, dyn, dur);

          last = 3;

        }

      break;

    }

  }

}

void ellipses()

{

  for (int i = 0; i < num; i++) {

    dy[i] = trianglePass(0, ypos);

    diam[i] = lowPass(50);

  }

  for (int i = 0; i < num; i++) {

    dx[i] = trianglePass(xa, xd);

  }

​

  for (int j = 0; j < num; j++) {

    stroke(random(255), random(255), random(255));

    fill(random(155), random(155), random(255), 30);

    ellipse(dx[j], dy[j], diam[j], diam[j]);

  }

}

​

void drawLines()

{

   for (int i = 0; i < w; i += w/6)

  {

    stroke(255);

    line(i, 0, i, h-60);

  }

  line(0, h-60, w, h-60);

}

​

​

int trianglePass(int a, int d)

{

  int aa = int(random(a, d) + random(a, d) + random(a, d) + random(a, d) + random(a, d) + random(a, d) + random(a, d) + random(a, d))/8;

  return aa;

}

​

int lowPass(int b)

{

  int bb = min(int(random(5, b)), int(random(5, b)));

  return bb;

}

​