Use pots connected to Arduino to make a bezier curve in Processing

BezierWithPots_Processing

// Bezier curve to visualize for drawing on xy machine. 

import processing.serial.*;
Serial myPort;
float  a,b,c,d,e,f,g,h;
float aa,bb,cc,dd,ee,ff,gg,hh;
String val;
boolean firstContact = false;
int end = 10;  
String serial;
int[] pos = new int[8];

void setup(){
  myPort = new Serial(this, Serial.list()[0],9600);
  myPort.clear();  
  serial = myPort.readStringUntil(end);
  serial = null;
  size(1000, 1000); 
  background(0); 
  stroke(255);
  noFill();
  smooth();
}

void draw(){
  background(0); 
  while (myPort.available() > 0) { 
    serial = myPort.readStringUntil(end);
  }
  if (serial != null) {  


    String numbers = serial;
    float[] pos = float(split(numbers, ','));  
    print(pos[0]); 
    print(" "); 
    a = pos[0]; 
    print(pos[1]);
    print(" "); 
    b =  pos[1]; 
    print(pos[2]);
    print(" ");
    c  = pos[2]; 
    print(pos[3]);
    print(" "); 
    d = pos[3];
    print(pos[4]);
    print(" ");
    e = pos[4]; 
    print(pos[5]);
    print(" ");
    f= pos[5]; 
    print(pos[6]);
    print(" ");
    g= pos[6]; 
    println(pos[7]);       
    h = pos[7];

  }

  delay(1000);
  bezier(a, b,     c, d,    e, f,     g, h);

}