Processing XY scope from linein

audio.pde

import ddf.minim.*;
import ddf.minim.effects.*;

// https://processing.org/discourse/beta/num_1200857589.html
class playBack implements AudioSignal, AudioListener{ //Just a simple "re-route" audio class.
  float[] left, right;
  //Getting.
  public void samples(float[] arg0) {
  left = arg0;
}

public void samples(float[] arg0, float[] arg1) {
  left = arg0;
  right = arg1;
}
//Sending back.
public void generate(float[] arg0) {
  System.arraycopy(left, 0, arg0, 0, arg0.length);
}

public void generate(float[] arg0, float[] arg1) {
  System.out.println(arg0[0]);
  if (left!=null && right!=null) {
    System.arraycopy(left, 0, arg0, 0, arg0.length);
    System.arraycopy(right, 0, arg1, 0, arg1.length);
  }
  }
}

Minim minim;
AudioPlayer wav;
AudioInput in;
  AudioSource audio = in;
  AudioOutput output = null;
//playBack pb = new playBack();

float size = 0;
boolean swap = true;

void setup()
{
  size(512, 512);
  
  size = (width/2.0) * 0.9;

  minim = new Minim(this);
  
  in = minim.getLineIn();
  output = minim.getLineOut();
  
  //in.addListener(pb);
  //output.addSignal(pb);
  
  wav = minim.loadFile("youscope_nointro.wav", 1024);
  //wav.cue(30 * 100000);
  //wav.loop();
  
  audio = in;
}


void draw()
{
  //background(0);
  fill(0,0,0, 96);
  rect(0, 0, width, height);
  
  fill(0,0,0, 255);
  rect(0, 0, 100, 50);
  fill(255,255,255, 255);
  stroke(64,255,64);
  text(audio.left.get(0), 50, 10);
  text("fps: " + frameRate, 15, 25);
  text("pos: " + wav.position()/1000.0 + " s", 15, 35);
  text("bufsize: " + audio.bufferSize(), 15, 45);
  text("swap: " + swap, 15, 15);

    float left1 = 0;
    float right1 = 0;
    float left2 = 0;
    float right2 = 0;
    
 
  //output.addSignal(audio.left);
  
  float waveform_w = 400;
  float waveform_h = 100;
  float waveform_x = 100;
  float waveform_y = 60;
  float waveform_skale = waveform_h/2;
  float add = waveform_w / audio.bufferSize();
   strokeWeight(1);
  fill(0,0,32, 255);
  rect(waveform_x, waveform_y-waveform_h/2, waveform_w, waveform_h);
  fill(255,255,255, 255);
  for(int i = 1; i < audio.bufferSize() - 1; i++)
  {
    right1 = audio.left.get(i -1);
    left1 = audio.right.get(i -1);
    right2 = audio.left.get(i);
    left2 = audio.right.get(i);
    float x1 = waveform_x + i * add - add;
    float x2 = waveform_x + i * add;
    stroke(255, 0, 0);    
    line(x1, left1 * waveform_skale + waveform_y, x2, left2 * waveform_skale + waveform_y);
    stroke(0, 255, 0);    
    line(x1, right1 * waveform_skale + waveform_y, x2, right2 * waveform_skale + waveform_y);  
  }
   strokeWeight(3);

  for(int i = 1; i < audio.bufferSize() - 1; i++)
  {

   if (swap) {
    right1 = audio.left.get(i -1);
    left1 = audio.right.get(i -1);
    right2 = audio.left.get(i);
    left2 = audio.right.get(i);     
   } else {
     left1 = audio.left.get(i -1);
    right1 = audio.right.get(i -1);
    left2 = audio.left.get(i);
    right2 = audio.right.get(i); 
   }
   
   float px = width/2.0 + left1 * size;
   float py = height/2.0 - right1 * size;
   float px2 = width/2.0 + left2 * size;
   float py2 = height/2.0 - right2 * size;
   
   float len = sqrt((px-px2)*(px-px2) + (py-py2)*(py-py2));
   stroke(64,255,64, (1.0/((len/size)*200.0)) *64);
    //stroke(64,255,64, (max(0.0, 0.15 - len/size))*128);
    //stroke(64,255,64, (exp(-(len/size)-1.0))*32);
    //point(width/2.0 + left * size, height/2.0 + right * size);
    line(px, py, px2, py2);
    
    //line(width/2.0 + left * size, height/2.0 + right * size, width, height);
    //line(i, 50  + audio.left.get(i)*50,  i+1, 50  + audio.left.get(i+1)*50);
    //line(i, 150 + audio.right.get(i)*50, i+1, 150 + audio.right.get(i+1)*50);
  }
}

void keyPressed()
{
  if (key == 's') swap = !swap;
}