import java.awt.*;

class intersectionPoint extends point
{
     public shape s1, s2;
     protected boolean pExists = true;
     protected double dragX, dragY;
     protected int whichPoint;
     
     public intersectionPoint(shape S1, shape S2, int WhichPoint)
     {
	  s1 = S1;
	  s2 = S2;
	  whichPoint = WhichPoint;
	  
	  UpdateCoordinates();
     }

     public intersectionPoint(shape S1, shape S2)
     {
	  s1 = S1;
	  s2 = S2;
	  whichPoint = 1;
	  
	  UpdateCoordinates();
     }

     public boolean exists()
     {
	  UpdateCoordinates();
	  return(pExists);
     }

     public void UpdateCoordinates()
     {
	  point p = s1.intersect(s2, whichPoint);
	  if (p == null)
	       p = s2.intersect(s1, whichPoint);
	  
	  if (p == null)
	  {
	       pExists = false;
	  }
	  else
	  {
	       x = p.x; y = p.y;
	       pExists = true;
	  }
     }     

     public void draw(GeometryWindow G)
     {
	  if (!exists() || hidden)
	       return;

	  UpdateCoordinates();
	  
	  if (pExists)
	       super.draw(G);
     }

     public void resetTranslated()
     {
	  translated = false;
	  
	  s1.resetTranslated();
	  s2.resetTranslated();
     }

     public boolean translate(double dx, double dy)
     {
	  if (translated)
	       return(true);

	  translated = true;

	  s1.translate(dx, dy);
	  s2.translate(dx, dy);
	  return(true);
     }

     public boolean mouseDown(double X, double Y)
     {
	  if (hidden)
	       return(false);

	  if (gMath.distance(x, y, X, Y) < clickRange)
	  {
	       dragging = true;
	       
	       double dx = X - x;
	       double dy = Y - y;
	       
	       resetTranslated();

	       s1.translate(dx, dy);
	       s2.translate(dx, dy);

	       UpdateCoordinates();

	       dragX = X;
	       dragY = Y;

	       return(true);
	  }
	  return(false);
     }

     public boolean mouseDrag(double X, double Y)
     {
	  if (dragging == true)
	  {
	       double dx = X - dragX;
	       double dy = Y - dragY;

	       resetTranslated();
	       s1.translate(dx, dy);
	       s2.translate(dx, dy);

	       UpdateCoordinates();

	       dragX = X;
	       dragY = Y;

	       return(true);
	  }
	  return(false);
     }

     public boolean mouseUp(double X, double Y)
     {
	  dragging = false;
	  return(false);
     }
}