import pitaru.sonia_v2_9.*;

int L = 1024; // FFT length (positive frequency)
int L2 = int(L*4); // table length
int sr = 44100;
int H = 10; //number of harmonics
int ampiezza;
float[] Data;
float freq = 10.00; // fundamental frequency [Hz]
Sample mySample;
float oneCycle = TWO_PI/L; 

void setup() {
  size(1024,200);
  frameRate(1);
  colorMode(HSB, 360, height, height);
  Sonia.start(this);
  mySample = new Sample(L2); // empty sample with L2 frames.
  Data = new float[L2]; // array with as many frames as samples.
  //populate the array with sample data, i.e. a sine wave 
  for(int k = 1; k <=H; k++){      // Additive Synthesis
    for(int i = 0; i < L2; i++){
      Data[i] = Data[i] + sin(i*oneCycle*freq*k)/10;
    }
  }
  mySample.write(Data); // write from 'Data' array into sample
  mySample.repeat(); // loop the sample */
}

void draw()
{
  background(0,20,0);
  strokeWeight(0);
  stroke(0,230,0);
  mySample.getSpectrum(L);  // FFT
  stroke(255); //println();
  for ( int i = 1; i < L; i++){
    ampiezza = int(mySample.spectrum[i]*L);
    line(i, height, i, height - 2*ampiezza/(0.003*i));
  }
}

void mouseReleased()
{
  freq = (float)(mouseX/2);  // to change the fundamental
  println(freq + " Hz");
  for (int i = 0; i < L2; i++) Data[i] = 0;
  for(int k = 1; k <=H; k++){      // Additive Synthesis
    for(int i = 0; i < L2; i++){
      Data[i] = Data[i] + sin(i*oneCycle*freq*k)/20;
    }
  }
  mySample.write(Data); // write from 'Data' array into sample
  mySample.getSpectrum(L); // initial steps
  mouseReleased();
}

// safely stop the Sonia engine upon shutdown.
public void stop(){
  Sonia.stop();
  super.stop();
}