Trailing Deque [Java/Pjs] - OpenProcessing

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/**
 * Trailing Deque (v4.0.0) [Java/Pjs]
 * by  Quarks (2013/Feb)
 * for Rialobran
 * mod GoToLoop
 *
 * https://Forum.Processing.org/two/discussion/3864/
 * how-to-draw-multiple-user-defined-lines#Item_3
 *
 * https://www.OpenProcessing.org/sketch/878488
 * https://Bl.ocks.org/GoToLoop/571eaa4797963ffbacdd706542c30637
 */
​
import java.util.Queue;
import java.util.ArrayDeque; // not needed anymore
​
static final boolean JAVA = 1/2 != 1/2.;
​
static final byte MAX_TRAIL_POINTS = 5;
final Queue<PointXY> trails = new ArrayQueue<PointXY>(MAX_TRAIL_POINTS);
//final Queue<PointXY> trails = new ArrayDeque<PointXY>(MAX_TRAIL_POINTS);
​
static final color BG  = 0350;
static final short FPS = 30;
static final String GFX = JAVA2D; // use JAVA2D, FX2D or P2D
​
void setup() {
  size(800, 600, GFX);
​
  frameRate(FPS);
  noLoop();
​
  stroke(PointXY.FG);
  strokeWeight(PointXY.BOLD);
}
​
void draw() {
  background(BG);
​
  PointXY tt = trails.peek();
  for (final PointXY t : trails)  tt = t.lineXY(tt);
​
  if (JAVA)  println(trails);
  else { // Pjs doesn't implement ArrayList::toString()
    for (final PointXY xy : trails)  print(xy);
    println("\n");
  }
}
​
void mousePressed() {
  trails.add( trails.size() == MAX_TRAIL_POINTS
    ? trails.remove().setXY(mouseX, mouseY)
    : new PointXY(mouseX, mouseY) );
​
  redraw();
}
​