public class Circ2D{

  public Vector2D Pos;
  public float r;

  Circ2D()
  {
    Pos = new Vector2D();
    r = 1.0f;
  }

  Circ2D(Vector2D p, float r_)
  {
    Pos = new Vector2D();
    Pos.Set(p);
    r = r_;
  }

  Circ2D(float x, float y, float r_)
  {
    Pos = new Vector2D(x,y);
    r = r_;
  }
  
  public boolean DoesPointISect(float x, float y)
  {
    float dx = Pos.x - x;
    float dy = Pos.y - y;
    
    if ((dx*dx) + (dy*dy) <= r*r)
    {  return true; }
    else 
    {  return false; }
  }
  
  public boolean DoesCircISect(Circ2D c)
  {
    float dx = Pos.x - c.Pos.x;
    float dy = Pos.y - c.Pos.y;
    float Tr = r + c.r;

    if ((dx*dx) + (dy*dy) <= Tr*Tr)
    {  return true; }
    else 
    {  return false; }
  } 
    
}