Follower [] followers;
boolean mPressed=false;
int r,g,b;
void setup() {
  size(600,600);
  background(#333333);
  buildFollowers(int(random(5,70)));
  noFill();
}
void buildFollowers(int pVal) {
  getInitColor();
  followers=new Follower[pVal];
  for(int i=0;i<followers.length;i++) {
    followers[i]=new Follower(i+5,r,g,b); 
   }
}
void getInitColor() {
  r=int(random(10,255));
  g=int(random(10,255));
  b=int(random(10,255));
}
void draw() {
  if(mousePressed) {
    if(mPressed==false) {
      mPressed=true;
      for(int i=0;i<followers.length;i++) {
        followers[i].gotoMouse();
      }
    }
    ellipseMode(CENTER); 
    for(int i=0;i<followers.length;i++) {
      ////stroke(followers[i].myColor);
      stroke(followers[i].r,followers[i].g,followers[i].b,5);
      strokeWeight(1);
      //ellipse(followers[i].myLoc.x, followers[i].myLoc.y, followers[i].ballSize, followers[i].ballSize); 
      if(i>=1) { 
        followers[i].followPrevious(followers[i-1]);
        strokeWeight(2);
        strokeCap(SQUARE);
        line(followers[i].myLoc.x,followers[i].myLoc.y,followers[i-1].myLoc.x,followers[i-1].myLoc.y);
      } else {
        followers[i].followMouse();
      }
    }
  }
}
void mouseReleased() {
  mPressed=false;
}
void keyPressed() {
  background(#333333);
  buildFollowers(int(random(5,70)));
}

class Follower {
  float ballSize=random(3,10);
  int myOrder,r,g,b;
  color myColor= color(r,g,b);
  Vector myLoc;
  Follower(int pOrd,int pR, int pG, int pB) {
    r=pR+int(random(-10,10));
    g=pG+int(random(-10,10));
    b=pB+int(random(-10,10));
    myOrder=pOrd;
    myLoc=new Vector(width/2,height/2);
  }
  void followMouse() {
    float dx=mouseX-myLoc.x;
    float dy=mouseY-myLoc.y;
    myLoc.x+=dx/myOrder;
    myLoc.y+=dy/myOrder;
  }
  void followPrevious(Follower pF) {
    float dx=pF.myLoc.x-myLoc.x;
    float dy=pF.myLoc.y-myLoc.y;
    myLoc.x+=dx/myOrder;
    myLoc.y+=dy/myOrder;
  }
  void gotoMouse() {
    myLoc.x=mouseX;
    myLoc.y=mouseY;
  }
}
class Vector{
  float x;
  float y;
  Vector (float pX, float pY) {
    x=pX;
    y=pY;
  }
  void moveX (float pVal) {
    x+=pVal;
    x=constrain(x,0,width);
  }
  void moveY (float pVal) {
    y+=pVal;
    y=constrain(y,0,height);
  }
}