/**
   A simple Polygon.
   @author Charlie McDowell
 */
class Polygon implements Shape {
    private int[] x, y;
    int count = 0;

    /**
       Construct a polygon with capacity for the specified number of points.
     */
    Polygon(int size) {
        x = new int[size];
        y = new int[size];
    }

    /**
       Add a point to this polygon.
       @throws IndexOutOfBoundsException if this polygon is at capacity
     */
    void add(int x, int y) {
        if (count >= this.x.length) {
            throw new IndexOutOfBoundsException("Too many points for this polygon.");
        }
        else {
            this.x[count] = x;
            this.y[count] = y;
            count++;
        }
    }


    /**
       Draw this polygon on the specifid graphics device.
     */
    public void draw(TGraphics graphics) {
        for(int i = 0; i < x.length-1; i++) {
            graphics.drawLine(x[i],y[i], x[i+1], y[i+1]);
        }
        graphics.drawLine(x[x.length-1],y[y.length-1], x[0], y[0]);
    }
}