001package horstmann.ch08_graphed2;
002import java.awt.Graphics2D;
003import java.awt.geom.Line2D;
004import java.awt.geom.Point2D;
005import java.awt.geom.Rectangle2D;
006import java.io.Serializable;
007
008/**
009   An edge in a graph.
010 */
011public interface Edge extends Serializable, Cloneable
012{
013        /**
014      Draw the edge.
015      @param g2 the graphics context
016         */
017        void draw(Graphics2D g2);
018
019        /**
020      Tests whether the edge contains a point.
021      @param aPoint the point to test
022      @return true if this edge contains aPoint
023         */
024        boolean contains(Point2D aPoint);
025
026        /**
027      Connects this edge to two nodes.
028      @param aStart the starting node
029      @param anEnd the ending node
030         */
031        void connect(Node aStart, Node anEnd);
032
033        /**
034      Gets the starting node.
035      @return the starting node
036         */
037        Node getStart();
038
039        /**
040      Gets the ending node.
041      @return the ending node
042         */
043        Node getEnd();
044
045        /**
046      Gets the points at which this edge is connected to
047      its nodes.
048      @return a line joining the two connection points
049         */
050        Line2D getConnectionPoints();
051
052        /**
053      Gets the smallest rectangle that bounds this edge.
054      The bounding rectangle contains all labels.
055      @return the bounding rectangle
056         */
057        Rectangle2D getBounds(Graphics2D g2);
058
059        Object clone();
060}
061