Source of AbstractEdge.java

Structures and functions

  1: import java.awt.*;
  2: import java.awt.geom.*;

  4: /**
  5:    A class that supplies convenience implementations for 
  6:    a number of methods in the Edge interface type.
  7: */
  8: public abstract class AbstractEdge implements Edge
  9: {  
 10:    public Object clone()
 11:    {
 12:       try
 13:       {
 14:          return super.clone();
 15:       }
 16:       catch (CloneNotSupportedException exception)
 17:       {
 18:          return null;
 19:       }
 20:    }

 22:    public void connect(Node s, Node e)
 23:    {  
 24:       start = s;
 25:       end = e;
 26:    }

 28:    public Node getStart()
 29:    {
 30:       return start;
 31:    }

 33:    public Node getEnd()
 34:    {
 35:       return end;
 36:    }

 38:    public Rectangle2D getBounds(Graphics2D g2)
 39:    {
 40:       Line2D conn = getConnectionPoints();      
 41:       Rectangle2D r = new Rectangle2D.Double();
 42:       r.setFrameFromDiagonal(conn.getX1(), conn.getY1(),
 43:             conn.getX2(), conn.getY2());
 44:       return r;
 45:    }

 47:    public Line2D getConnectionPoints()
 48:    {
 49:       Rectangle2D startBounds = start.getBounds();
 50:       Rectangle2D endBounds = end.getBounds();
 51:       Point2D startCenter = new Point2D.Double(
 52:             startBounds.getCenterX(), startBounds.getCenterY());
 53:       Point2D endCenter = new Point2D.Double(
 54:             endBounds.getCenterX(), endBounds.getCenterY());
 55:       return new Line2D.Double(
 56:             start.getConnectionPoint(endCenter),
 57:             end.getConnectionPoint(startCenter));
 58:    }

 60:    private Node start;
 61:    private Node end;
 62: }