三次元スペクトログラム

import ddf.minim.spi.*;
import ddf.minim.signals.*;
import ddf.minim.*;
import ddf.minim.analysis.*;
import ddf.minim.ugens.*;
import ddf.minim.effects.*;
/**
* 3D spectrogram by line
* 
* @author aa_debdeb
* @date2016/05/22
*/

Minim minim;
AudioInput in;
FFT fft;

float[][] values;
int timeWidth = 200;

void setup(){
  size(500, 500, P3D);
  minim = new Minim(this);
  in = minim.getLineIn(Minim.STEREO, 1024);
  fft = new FFT(in.bufferSize(), in.sampleRate());
  
  values = new float[fft.specSize()][timeWidth];
  for(int i = 0; i < fft.specSize(); i++){
    for(int j = 0; j < timeWidth; j++){
      values[i][j] = 0.0;
    }
  } 
  fill(0);
  stroke(255);
  strokeWeight(2);
}

void draw(){
  fft.forward(in.mix);
  for(int i = 0; i < fft.specSize(); i++){
    for(int j = 0; j < timeWidth - 1; j++){
      if(j != timeWidth - 2){
        values[i][j] = values[i][j + 1];
      } else {
        values[i][j] = fft.getBand(i);
      }
    }
  } 
  background(0);
  translate(width / 2, height / 2, -100);
  rotateX(PI / 3);
  rotateZ(PI / 12);
  for(int i = 0; i < fft.specSize(); i += 10){
    beginShape();
    for(int j = 0; j < timeWidth; j++){
      float x = map(j, 0, timeWidth - 1, -width / 2, width / 2); 
      float y = map(i, 0, fft.specSize() - 1, height / 2,  -height / 2);
      float z = values[i][j] * 10;
      vertex(x, y, z);      
    }
    endShape();
  }
}