int zone=300;
float force=2;
float retour=0.001;
int amplitude=15;

int j=0;
float oldY=zone/2;
float jaune;
float fps=0;
float frame=0;
float t=second();
float[] ligne = new float[zone];

//Ball[] listBall = new Ball[999];
Ball b1 = new Ball(zone/4, 0);
Ball b2 = new Ball((zone/4)*2, 0);
Ball b3 = new Ball((zone/4)*3, 0);

void setup(){
  size(zone,zone);
  //framerate(60);
  smooth();
  cursor(CROSS);
 
  //PFont font;
  //font = loadFont("data/ArialMT-14.vlw");
  //textFont(font, 14);
  //textAlign(RIGHT);
 
  for(int i=0; i<zone; i++){
    ligne[i] = zone/2;
  }
  strokeWeight(2);
}

void draw(){
  background(0);
 
  //text(int(frame), zone-4, 14);
  if(t != second()){
    t = second();
    frame=frameCount-fps;
    fps=frameCount;
  }
  j=0;
  stroke(255,180,0); strokeWeight(6);
  beginShape(LINE_STRIP);
  curveVertex(0,  zone/2);
  curveVertex(0,  zone/2);
 
  for(int i=1; i<(zone-1); i++){
    if(ligne[i] > zone/2){ligne[i] -= retour*(ligne[i]-(zone/2));}
    if(ligne[i] < zone/2){ligne[i] += retour*((zone/2)-ligne[i]);}
    ligne[i]=((ligne[i]) + ligne[i-1] + ligne[i+1])/3;
   
    j++;
    if(j==amplitude && i<(zone-amplitude+1)){
      j=0;
      curveVertex(i, ligne[i]);
    }
  
    jaune = 5*((zone/2)-ligne[i]);
    if(jaune<0){jaune=jaune*-1;}
    stroke(255,jaune,0);
    point(i,ligne[i]);
  }
 
  curveVertex(zone-1,  zone/2);
  curveVertex(zone-1,  zone/2);
  stroke(255); strokeWeight(2);
  endShape();
 
  if(mousePressed == true){oldY = mouseY;}
 
  b1.update(ligne[b1.getXpos()]);
  b2.update(ligne[b2.getXpos()]);
  b3.update(ligne[b3.getXpos()]);
}


void mouseDragged(){
  if(mouseX<zone && mouseY<zone && mouseX>0 && mouseY>0){
    ligne[mouseX] -= (oldY-mouseY)*force;
    oldY = mouseY;
  }
}

class Ball {
  float Xpos, Ypos, Yec;
  Ball(float a, float b){
    Xpos=a;
    Ypos=b;
    Yec=0;
  }
 
  void update(float ground) {
    if(Ypos <= ground-10){
      Ypos += Yec;
      Yec += 0.01;
    }else{
      Ypos = ground-10;
      Yec = (Yec*-1)+.2;
      Ypos += Yec;
    }
 
    fill(255);
    ellipse(Xpos, Ypos, 10, 10);
  }
 
  int getXpos(){
    return int(Xpos);
  }
}