TrackStar_Applet

import java.util.List;
import toxi.geom.*;
import controlP5.*;
//-------------------------------------------------------------------------------------------
//---------------------------------------Globals--------------------------------------------
//-------------------------------------------------------------------------------------------
Vec3D locStart;

Agent a;
ControlP5 cp5;
GUI cgui;
Path tempPath;

boolean simulate;
boolean debug = false;
int resetAmount = 0; 
int agentCount = 250;

List<Agent> agentList;
//-------------------------------------------------------------------------------------------
//---------------------------------------Settings--------------------------------------------
//-------------------------------------------------------------------------------------------
void settings() {
  size(1920, 1080, FX2D);
  smooth();
}
//-------------------------------------------------------------------------------------------
//---------------------------------------Setup-----------------------------------------------
//-------------------------------------------------------------------------------------------
void setup() {
  background(0);
  this.agentList = new ArrayList<Agent>();
  this.simulate = true;
  if (this.resetAmount == 0) {
    this.cgui = new GUI();
    this.cgui.run(this);
  }
  newPath();
  for (int i = 0; i < this.agentCount; i ++) {
    this.locStart = new Vec3D(0, random(height), 0);
    this.a = new Agent(this.locStart);
    this.agentList.add(this.a);
  }
}
//-------------------------------------------------------------------------------------------
//---------------------------------------Draw------------------------------------------------
//-------------------------------------------------------------------------------------------
void draw() {
  background(0);

  this.agentCount = (int)this.cgui.s7.getValue();
  this.tempPath.display();
  this.tempPath.radius = this.cgui.s0.getValue();

  for (Agent ag : this.agentList) { //set the agent field values
    ag.maxforce = this.cgui.s6.getValue();
    ag.max = this.cgui.s5.getValue();
    ag.amp = this.cgui.s9.getValue();
    ag.vel = this.cgui.s4.getValue();
    ag.run();
  }
}
//-------------------------------------------------------------------------------------------
//---------------------------------------Create New Path-------------------------------------
//-------------------------------------------------------------------------------------------
void newPath() {
  this.tempPath = new Path();
  this.tempPath.addPoint(-20, height/2);
  this.tempPath.addPoint(random(0, width/2), random(0, height));
  this.tempPath.addPoint(random(width/2, width), random(0, height));
  tempPath.addPoint(width+20, height/2);
}
//-------------------------------------------------------------------------------------------
//---------------------------------------Keys------------------------------------------------
//-------------------------------------------------------------------------------------------
void keyPressed() {
  if (key == 'R') {
    this.resetAmount ++;
    setup();
  }
  if (key == 'S') this.simulate = !this.simulate;
  if (key == 'W') this.newPath();
  if (key == 'Q')this.debug = !this.debug; 
  if (key == 'S') {
    simulate = !simulate;
    saveFrame("img-######.png");
  }
}
Update