ArrayList<Blob> blobs = new ArrayList<Blob>();

float SZ;
void setup() {
  size(500, 500);
  SZ = 500;
  
  for(int i = 0; i < 5; i++){
     blobs.add(new Blob(random(100,400),random(200,300))); 
  }

  
  noStroke();
}


void draw() {
  background(220);

  
  for(Blob b : blobs){
      b.check();
     b.draw();
  }
  fill(220);
  rect(0,250,500,250);
    fill(240);
  arc(250,250,480,300,0,PI);
}


class Blob{

    ArrayList<Corner> corners= new ArrayList<Corner>();
    float sz,x,y;
    Blob(float px, float py){
      x = px ; y = py;
       sz = SZ / 5;
       for(int i = 0; i < 4; i++){
           float a = 2 * PI - (i * (PI/2)) - PI/4;
           corners.add(new Corner(
             x + (cos(a) *sz)+ (sz * random(-.2,.2)),
             y + (sin(a) *sz)+ (sz * random(-.2,.2))
              
           ));
       }
    } 
    boolean mouseIn = false;
   void check(){
     boolean mouseInNow = mouseSortaOver();
     if(mouseIn && ! mouseInNow){
   //    println("RELEASE");
        for(Corner c : corners){
           c.release();
        }           
     } 
     if(! mouseIn && mouseInNow){
  //     println("HOLD " + dist(mouseX,mouseY,x,y));
        for(Corner c : corners){
           c.startHold(x,y);
        } 
     }
     if(mouseIn && mouseInNow){
//       println("PRESS " + dist(mouseX,mouseY,x,y));
        for(Corner c : corners){
           c.press(sz-dist(x,y,mouseX,mouseY));
        } 
     }     
      mouseIn = mouseInNow;
      if(!mouseIn){
        for(Corner c : corners){
           c.move();
        }         
      }
   }
   boolean mouseSortaOver(){
    return dist(mouseX,mouseY, x, y) <sz;
   } 
    float r = random(1);
    
  void draw(){
    if(r < .4)   fill(200,0,0,128);
    else fill(0,200,0,128);
    beginShape();
    for(Corner c : corners){
       vertex(c.x,c.y); 
    }
    Corner start = corners.get(0);
    vertex(start.x,start.y);
    endShape();
  }
}


class Corner{
   float bx,by,x,y, xs, ys, a;
  boolean holding = false;
    Corner(float px, float py){
       bx = x = px;
       by = y = py;
    }
    void startHold(float cx, float cy){ //pick a direction... randomly offset from angle from center
       a = atan2(y - cy, x - cx);
       a += random(-.3,.3);
       a = random(0,PI*2);
       //println("a is "+a);
    }
    
    void press(float s) {
      x = bx + cos(a) * s/1.5; 
      y = by + sin(a) * s/1.5; 
      //print("    s is "+s);
    }
    
    void release(){
      
    }
   void move(){
       float f = dist(x,y,bx,by)/10;
     
      if(x < bx) xs += f;
      if(x > bx) xs -= f;
      if(y < by) ys += f;
      if(y > by) ys -= f;
      x += xs;
      y += ys;
      xs *= .98;
      ys *= .98;
   } 
   
}