Triangle class

package cz.muni.fi.pb162.project.geometry;

/**
 * Created by xmlynar1 on 6.10.15.
 */
public class Triangle {
    private Vertex2D VertexA, VertexB, VertexC; //Vrcholy trojuholnika
    private Triangle TriA, TriB, TriC; //Trojuholniky pri vrcholoch po rozdeleni


    public Vertex2D getVertexA() {
        return VertexA;
    }

    public void setVertexA(Vertex2D vertexA) {
        VertexA = vertexA;
    }

    public Vertex2D getVertexB() {
        return VertexB;
    }

    public void setVertexB(Vertex2D vertexB) {
        VertexB = vertexB;
    }

    public Vertex2D getVertexC() {
        return VertexC;
    }

    public void setVertexC(Vertex2D vertexC) {
        VertexC = vertexC;
    }

    @Override
    public String toString() {
        return "Triangle: vertices="+VertexA+" "+VertexB+" "+VertexC;
    }

    public boolean isDivided(){

        return (TriA != null);

    }

    public Triangle getSubTriangle(int i){

        switch (i){

            case 0:
                return TriA;

            case 1:
                return TriB;

            case 2:
                return TriC;

            default:
                return null;

        }

    }

    private Vertex2D countSplitPoint(Vertex2D a, Vertex2D b){
        Vertex2D result = new Vertex2D();
        result.setX((a.getX() + b.getX()) / 2.0);
        result.setY((a.getY() + b.getY()) / 2.0);
        return result;
    }

    public boolean divide() {

        if(isDivided()){
            return false;
        }
        else {
            TriA = new Triangle();
            TriB = new Triangle();
            TriC = new Triangle();
            Vertex2D s1 = countSplitPoint(VertexA, VertexB);
            Vertex2D s2 = countSplitPoint(VertexB, VertexC);
            Vertex2D s3 = countSplitPoint(VertexC, VertexA);
            TriA.setVertexA(s1);
            TriA.setVertexB(VertexA);
            TriA.setVertexC(s3);
            TriB.setVertexA(s1);
            TriB.setVertexB(VertexB);
            TriB.setVertexC(s2);
            TriC.setVertexA(s2);
            TriC.setVertexB(VertexC);
            TriC.setVertexC(s3);
            return true;
        }

    }

}