// Singularity.java

class Singularity {
   Singularity()  {exists = false;  give = new Velocity(0.0F, 0.0F);}

   void set(float f, float f1, float f2, int i)
   {  s  = f2;
      id = i;
      x  = f;
      y  = f1;
      birthday = System.currentTimeMillis();
      exists = true;
   }

   Velocity V(float f, float f1)
   { Velocity velocity = give;
     float f3 = f - x;
     float f4 = f1 - y;
     float f2 = f3 * f3 + f4 * f4;
      switch(id) {
         default:  break;
         case 1:
            if(f2 > 0.0F) {
               velocity.u = (s / f2) * f3;
               velocity.v = (s / f2) * f4;
               velocity.inf = false;
            }
            else {velocity.inf = true;}
            break;
         case 2:
            if(f2 > 0.0F) {
               velocity.u = (-s / f2) * f4;
               velocity.v = ( s / f2) * f3;
               velocity.inf = false;
            }
            else {velocity.inf = true;}
            break;
      }
      return velocity;
   }

   float    x, y, s;
   long     birthday;
   int      id;
   boolean  exists;
   Velocity give;
}