Sindbad~EG File Manager

/**
 * This class represents a Closed Polygon (with only 3 points)
 *  displayed by Diagrammer.
 * File: Triangle.java
 *
 * This code is in the public domain.
 *
 * @author Brian Chan
 */

package org.dynamicgeometry.diagrammer;

import java.util.*;

public class Triangle extends ClosedPolygon {

	// the number of Points allowed for this Closed Polygon
	private final static int NUM_OF_POINTS = 3;

	/**
	 * A constructor for Triangle
	 *
	 */
	public Triangle()
	{
		// calls the constructor of Closed Polygon
		super();
	}

	/**
	 * A constructor for Triangle
	 * Creates a Triangle using three Points as parameters.
	 *
	 * @param p1 the first Point of the Triangle
	 * @param p2 the second Point of the Triangle
	 * @param p3 the third Point of the Triangle
	 */
	public Triangle(Point p1, Point p2, Point p3)
	{
		// calls the other Constructor of this Triangle
		this();

		if(p1 instanceof Point &&
		   p2 instanceof Point &&
		   p3 instanceof Point)
		{
			this.Arguments.add(p1);
			this.Arguments.add(p2);
			this.Arguments.add(p3);
		}
	}
	/**
	 * Sets the Points used to create a Quadrilateral.
	 *
	 * @param the list of three new Points used for this Quadrilateral.
	 * @return true if the points were successfully set, false if not.
	 */
	public boolean setPoints(ArrayList<GeometricObject> points)
	{
		// checks if the number of Points in the List correspond to
		// the number of Points a Triangle should have.
		if(points != null &&
		   points.size() == NUM_OF_POINTS)
		{
			return super.setPoints(points);
		}
		else return false;
	}
}