/****************************************************************************
** COPYRIGHT (C):    1997 Cay S. Horstmann. All Rights Reserved.
** PROJECT:          Practical OO Development with C++ and Java
** FILE:             DiagramEditor.java
** PURPOSE:          an instance of the graph editor framework
** VERSION           1.0
** PROGRAMMERS:      Cay Horstmann (CSH)
** RELEASE DATE:     3-15-97 (CSH)
** UPDATE HISTORY:
****************************************************************************/

import java.applet.*;
import java.util.*;
import java.awt.Graphics;
import practicaloo.*;

class CircleNode extends Node
{  public void plot(Graphics gc)
   {  gc.drawOval(center().get_x() - RADIUS, center().get_y() - RADIUS,
         2 * RADIUS, 2 * RADIUS);
   }

   public Rectangle enclosing_rect()
   {  Point c = (Point)center().clone();
      Point d = (Point)center().clone();
      c.move(-RADIUS - OFFSET, -RADIUS - OFFSET);
      d.move(RADIUS + OFFSET, RADIUS + OFFSET);
      return  new Rectangle(c, d);
   }

   public boolean is_inside(Point p)
   {  Ellipse c = new Ellipse(center(), RADIUS, RADIUS);
      return c.is_inside(p);
   }

   public Point boundary_point(Point exterior)
   {  Point r = (Point)center().clone();
      double a = r.angle(exterior);
      r.move((int)(RADIUS * Math.cos(a)), (int)(RADIUS * Math.sin(a)));
      return r;
   }

   private static int RADIUS = 25;
   private static int OFFSET = 1;
}

class DotNode extends Node
{  public void plot(Graphics gc)
   {  gc.fillOval(center().get_x() - RADIUS, center().get_y() - RADIUS,
         2 * RADIUS, 2 * RADIUS);
   }

   public Rectangle enclosing_rect()
   {  Point c = (Point)center().clone();
      Point d = (Point)center().clone();
      c.move(-RADIUS - OFFSET, -RADIUS - OFFSET);
      d.move(RADIUS + OFFSET, RADIUS + OFFSET);
      Rectangle r = new Rectangle(c, d);
      return r;
   }

   public boolean is_inside(Point p)
   {  Ellipse c = new Ellipse(center(), RADIUS, RADIUS);
      return c.is_inside(p);
   }

   public Point boundary_point(Point exterior)
   {  Point r = (Point)center().clone();
      double a = r.angle(exterior);
      r.move((int)(RADIUS * Math.cos(a)), (int)(RADIUS * Math.sin(a)));
      return r;
   }

   private static int RADIUS = 25;
   private static int OFFSET = 1;
}


class Line extends Edge
{  public void plot(Graphics g, Point a, Point b)
   {  Segment s = new Segment(a, b);
      s.plot(g);
   }

   public boolean is_on(Point p, Point a, Point b)
   {  Segment s = new Segment(a, b);
      return s.distance(p) < 3;
   }
}

class Arrow extends Edge
{  public void plot(Graphics gc, Point a, Point b)
   {  Segment s = new Segment(a, b);
      s.plot(gc);
      int dx = b.get_x() - a.get_x();
      int dy = b.get_y() - a.get_y();
      double angle = Math.atan2(dy, dx);
      int x1 = b.get_x() - (int)(ARROW_LEN * Math.cos(angle - Math.PI / 6));
      int y1 = b.get_y() - (int)(ARROW_LEN * Math.sin(angle - Math.PI / 6));
      int x2 = b.get_x() - (int)(ARROW_LEN * Math.cos(angle + Math.PI / 6));
      int y2 = b.get_y() - (int)(ARROW_LEN * Math.sin(angle + Math.PI / 6));
      Segment r1 = new Segment(b, new Point(x1, y1));
      r1.plot(gc);
      Segment r2 = new Segment(b, new Point(x2, y2));
      r2.plot(gc);
   }

   public boolean is_on(Point p, Point a, Point b)
   {  Segment s = new Segment(a, b);
      return s.distance(p) < 3;
   }

   private static int ARROW_LEN = 8;
}

public class DiagramEditor extends GraphEditor
{  public String[] get_types()
   {  String[] types = { "CircleNode", "DotNode", "Line", "Arrow" };
      return types;
   }
}