GrafikChat/src/grafikchat/model/Figures.java

package grafikchat.model;

import java.awt.Point;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

/**
 * Implementation of a list of figures
 * 
 * @author marian
 */
public class Figures implements Serializable
{
    private ArrayList<Figure> figureList;
    private Figure lastFigure;
    private Point lastPoint;
    private Point secondToLastPoint;
    private static final long serialVersionUID = 8582433437601788990L;
    
    
    /**
     * Constructor, initialize variables
     */
    public Figures()
    {
        figureList = new ArrayList<>();
        lastFigure = null;
        lastPoint = null;
        secondToLastPoint = null;
    }
    
    /**
     * Add point to latest figure
     * @param p new point to add
     */
    public void addPoint(Point p)
    {
        lastFigure.addPoint(p);
        secondToLastPoint = lastPoint;
        lastPoint = p;
    }
    
    /**
     * Create new figure
     */
    public void newFigure()
    {
        Figure f = new Figure();
        figureList.add(f);
        lastFigure = f;
        
        lastPoint = null;
        secondToLastPoint = null;
    }
    
    /**
     * Get the last two points of the latest figure
     * @return last two points of latest figure
     * @throws Exception if not yet available
     */
    public List<Point> getLastTwoPoints() throws Exception
    {
        if (secondToLastPoint == null || lastPoint == null) {
            throw new Exception("Not enough points available");
        }
        
        ArrayList<Point> p = new ArrayList<>();
        p.add(lastPoint);
        p.add(secondToLastPoint);
        
        return p;
    }
    
    /**
     * Get latest figure
     * @return latest figure
     * @throws Exception if not yet available
     */
    private List<Point> getFigure() throws Exception
    {
        if (lastFigure == null) {
            throw new Exception("No figure available");
        }
        
        return lastFigure.getPoints();
    }
    
    /**
     * Set new figures
     * @param f 
     */
    public void setFigures(ArrayList<Figure> f)
    {
        figureList = f;
    }
    
    /**
     * Get all current figures
     * @return 
     */
    public ArrayList<Figure> getFigures()
    {
        return figureList;
    }
    
}