// Random Movement

Thing[] things;
int num;

void setup(){
  size(800,400);
  background(204,204,182);
  framerate(30);
  // Creating the objects
  num = width/8 -2;
  things = new Thing[num];
  int hsize = 50;
  for (int i=0; i<num; i++) {
    things[i] = new Thing(10+i*8, 200, 100);
  }
  loadFonts();
  drawTitle();
}
 
void loop(){
  background(204,204,182);
  drawTitle();
  for (int i=0; i<num; i++) {
    things[i].update(i);
    things[i].display();
  }
}

class Thing {
  int x,y;
  float height;
  float dif;
  
  Thing(int _x, int _y, int _l){
    x = _x;
    y = _y;
    height = _l;
  }
  void display(){
    int halfheight = int(height/2);
    noStroke();
    fill(102,102,102);
    // lines amplitude
    stroke(102,102,102);
    line(x+1,200-halfheight,x+1,y+halfheight);
    line(x,200-halfheight,x+2,200-halfheight);
    line(x,y+halfheight,x+2,y+halfheight);
    // the differnce (exagerated by *2)
    stroke(255,255,255);
    fill(234,143,21);
    rect(x, 200-dif, 3, dif*2);
  }
  void update(int i){
    float newheight;
    //dif = alter();
    if(i == 0){
      newheight = alter() + (things[things.length-1].height + height)/2 ;
    }else{
      newheight = alter() + (things[i-1].height + height)/2;
    }
    if (newheight == 0) { newheight = .01;}
    dif = height - newheight;
    height = newheight;
  }
}
  
public float alter(){
  float n = random(6)-3;
  return(n);
}

void drawTitle(){
  // Text Caption
  fill(102,102,102);
  text("_random movement 1D", 610, 370); 
}

void loadFonts(){
  BFont Univers65; 
  Univers65 = loadFont("Univers65.vlw.gz"); 
  textFont(Univers65, 18); 
}