// Polygon.java
// S. Tanimoto, 1 Feb. 2000

import java.awt.*;
import java.util.*;

public class Polygon extends DrawnObject {
    final static int r = 5; // radius of dot for displaying first vertex.

    Vector theVertices;
    boolean closed; // True if a segment is to be drawn from last to first.
    int lineThickness;
    Color theColor;

    Polygon() {
	theVertices = new Vector();
        closed = false;
    }

    public void addVertex(PDPoint p) {
        theVertices.addElement(p);
    }
    public void close() {
        closed = true;
    }
    public void open() {
        closed = false;
    }
    public void setLineThickness(int theThickness) {
	lineThickness = theThickness;
    }
    public void setColor(Color aColor) {
	theColor = aColor;
    }
    public Vector getVertices() {
	return theVertices;
    }
    public boolean lastVertexNotAt(int anX, int aY) {
	if (theVertices.isEmpty()) return true;
	PDPoint p = (PDPoint) theVertices.lastElement();
        if ((p.getX() == anX) && (p.getY() == aY)) return false;
	else return true;
    }

    public void paint(Graphics g) {
        PDPoint lastVertex, firstVertex;
        Enumeration enum = theVertices.elements();
        if (enum.hasMoreElements()) {
            lastVertex = (PDPoint) enum.nextElement();
            firstVertex = lastVertex;
        }
        else return;
	firstVertex.paint(g);
	g.setColor(theColor);
	if (theVertices.size() == 1) {
	    g.fillOval(((int)lastVertex.getX()) - r,
                       ((int)lastVertex.getY()) - r,
		       r+r,
                       r+r);
	    return;
	}

        for (
             ; enum.hasMoreElements();) {
	    PDPoint vertex = (PDPoint) enum.nextElement();
            g.drawLine((int) lastVertex.getX(), (int) lastVertex.getY(),
                       (int) vertex.getX(), (int) vertex.getY() );
	    lastVertex = vertex;
	    lastVertex.paint(g);
        }
	if (closed) {
            g.drawLine((int) lastVertex.getX(),  (int) lastVertex.getY(),
                       (int) firstVertex.getX(), (int) firstVertex.getY() );
	}
    }
}