PFont font;
Letter l;
Letter ll;
char k;
ArrayList on = new ArrayList();
ArrayList off = new ArrayList();
float xspeed = 0.8;
float yspeed = 1.9;

void setup(){
  size (500,500);
  textAlign(LEFT);
  font = loadFont("Bauhaus93-48.vlw");
  textFont(font);
  l = new Letter(k,0,75);
}

void draw(){
  background (255);
  fill(0);
  rect(0,80,150,10);
  rect(280,460,100,40);
  pushMatrix();
  translate(80, 410);
  rotate(PI+PI/2);
  textSize(48);
  text ("TRAMPOLINE",0,0);
  popMatrix();
  textSize(25);
  l.displayOn();
  l.displayOff();
}

void keyPressed(){
  k = (char)key;
  l = new Letter(k,0,75);
  for (int i = on.size()-1; i >= 0; i--){
    Letter ll = (Letter)(on.get(i));
    ll.xPos =  ll.xPos+20;
    if (ll.xPos >150 ){
      on.remove(i);
      off.add(ll);
    }
  }
  on.add(l);
}

class Letter {
  char toBe;
  float xPos;
  float yPos;
  boolean flipped;
  
  Letter(char toBe, float xPos, float yPos){
    this.toBe = toBe;
    this.xPos = xPos;
    this.yPos = yPos;
    this.flipped = false;
  }
  
  void displayOn (){
   for (int i = 0; i < on.size(); i++){
    l = (Letter )on.get(i);
    text (l.toBe,l.xPos, l.yPos);
  }
 }
 
 void displayOff(){
   for (int i = 0; i < off.size(); i++){
   l = (Letter )off.get(i);
    if (l.flipped == true){
      l.xPos += xspeed;
      l.yPos -= yspeed;
      text(l.toBe, l.xPos, l.yPos);
    } else {
        l.xPos += xspeed;
        l.yPos += yspeed;
        if (l.yPos > 460){
          l.flipped = true;
        } 
       text(l.toBe, l.xPos, l.yPos);
     }
    }
  }
}