fft_locao.pde

import ddf.minim.*;

Minim minim;
AudioPlayer groove;

float c = 0;
int step = 1;

void setup()
{
  size(1024, 1024);

  minim = new Minim(this);
  groove = minim.loadFile("it.mp3", 1024);
  
  colorMode(HSB, 100);
  
  smooth();
  frameRate(60);
}

void draw()
{
  background(0);  
  
  int num = groove.bufferSize();
  
  float angleInc = (2*PI)/(num/step);
  
  for(int i = 0; i < groove.bufferSize() - step; i+=step)
  {
    
    float r = 300 - (groove.left.get(i) * 40);
    float theta = angleInc*i;
    
    float x = r * cos(theta);
    float y = r * sin(theta);
    
    float r2 = 300 + (groove.left.get(i) * 40);
    float theta2 = angleInc*i;   
    
    float x2 = r2 * cos(theta2);
    float y2 = r2 * sin(theta2);
    
    strokeWeight(4);
    stroke(c%100, 50, 100);    
    line(512+x, 512+y, 512+x2, 512+y2);
    
  }
  c+=0.1;
}

void keyPressed()
{  
  if (key == 'p' || key == 'P') {
    groove.loop(); 
  } 
}