class Polygon (slide 3 of 3)

public double volume() { return 0.0; }

public int nVertices() { return vertices.size(); }

public int nFaces() { return 1; }

public void paint(Graphics g) {

g.setColor(c);

Enumeration enum = vertices.elements();

Point firstVertex = (Point) enum.nextElement();

Point lastVertex = firstVertex;

while(enum.hasMoreElements()) {

Point thisVertex = (Point) enum.nextElement();

g.drawLine(lastVertex.x, lastVertex.y ,

thisVertex.x, thisVertex.y);

lastVertex = thisVertex;

}

g.drawLine(lastVertex.x, lastVertex.y,

firstVertex.x, firstVertex.y);

}