import processing.sound.*;
import java.util.ArrayList;

SoundFile sample;
Amplitude rms;
int m = 10;
int dim = 900;
ArrayList<Float> loudness = new ArrayList<Float>();

public void setup() {
  size(900, 900);
  sample = new SoundFile(this, "name.wav");
  sample.play();
  rms = new Amplitude(this);
  rms.input(sample);
  frameRate(24);
}

public void draw() {
  background(0);
  stroke(255);
  strokeWeight(4);
  float vol = rms.analyze();
  loudness.add(vol);
  for(int i = 0; i < loudness.size(); i++) {
    float y1 = map(loudness.get(i), 0, 1, dim/2, 0);
    float y2 = map(loudness.get(i), 0, 1, dim/2, dim);
    strokeCap(ROUND);
    line(i*m, dim/2, i*m, y1);
    line(i*m, dim/2, i*m, y2);
  }
  if (loudness.size() * m > width - 100) {
    loudness.remove(0);
  }
  if(!sample.isPlaying()) {
    noLoop();
  }
}

void draw1() {
  background(0);
  textSize(48);
  text(frameCount/60, width/2, height/2);
  if(!sample.isPlaying()) {
    noLoop();
  }
}