void keyPressed(){
  things = new ArrayList<Thing>();
  background(255);
  thing = null;

}
ArrayList<Thing>things = new ArrayList<Thing>();

Thing thing = null;
float axs, ays;


void setup(){
  background(255);
   size(500,500);
  smooth(); 
  noStroke();
}
void draw(){
if(thing != null) {
   thing.draw(); 
}
   for(Thing t:things){
      t.move();
      t.draw();
   } 
}

void mousePressed(){
   thing = new Thing(); 
}

void mouseReleased(){
    if(thing != null){
      thing.release();
      things.add(thing);
    }
}

void mouseDragged(){
   if(thing != null){
      thing.force();
   } 
}




float sz = 30;

class Thing{
  float x,y,xs,ys;
  color c;
  boolean free = false;
  Thing(){
    c = color(random(255),random(255),random(255));
    x = mouseX;
    xs = mouseX - pmouseX;  
    y = mouseY;
    ys = mouseY - pmouseY;
oldx = x;
oldy = y;
    
    //xs *= -1; ys*= -1;
  }
  void release(){
     free = true; 
  }
  float G = .1;
  float oldx,oldy;
  void move(){
    oldx = x;
    oldy = y;
    if(free){
     //xs += map(250-x,0,200,0,1); 
     //ys += map(250-y,0,200,0,1); 
     
     if(x < 250) xs += G;
     if(y < 250) ys += G;
     if(x > 250) xs -= G;
     if(y > 250) ys -= G;
     
     x += xs;
     y += ys;
    }
  }
  
  void force(){
    oldx = x;
    oldy = y;
     x = mouseX;
    y = mouseY;  
    xs += mouseX - pmouseX ;
    ys += mouseY - pmouseY;
    xs *= .3;
    ys *= .3;

    stroke(c);
    strokeWeight(10);
    line(x,y,oldx,oldy);

  }
  
  void draw(){
    if(free){
    stroke(c);
    strokeWeight(10);
    line(x,y,oldx,oldy);
  }
  }
  
  
}