Zad3

package zad3;

import static java.lang.Math.*;

public class Wektor {

    private double xP = 0;
    private double yP = 0;
    private double xK;
    private double yK;
    private double dlugosc;
    private double kat;

    private static Wektor d1k0 = new Wektor(1,0,1,0);
    private static Wektor d1k90 = new Wektor(0,1,1,90);
    private static Wektor d1k180 = new Wektor(-1,0,1,180);
    private static Wektor d1k270 = new Wektor(0,-1,1,270);

    public Wektor(){

    }

    public static Wektor stworz(double param1, double param2, boolean konWek){
        if (konWek == true){
            double xk = param1;
            double yk = param2;
            double dl = sqrt(xk*xk+yk*yk);
            double kat = atan(yk/xk);
            return new Wektor(xk,yk,dl,kat);
        }
        else{
            if (param1 == 1){
                int x = (int)param2;
                switch(x){
                    case 0:     return d1k0;
                    case 90:    return d1k90;
                    case 180:   return d1k180;
                    case 270:   return d1k270;
                }
                double a = tan(param2);
                double xk = sqrt(1/(1+a*a));
                double yk = a*x;
                double dl = param1;
                double kat = param2;
                return new Wektor(xk,yk,dl,kat);
            }
        return new Wektor(0,0,0,0);
        }
    }

    private Wektor(double xk, double yk, double dl, double kat){
        this.xK = xk;
        this.yK = yk;
        this.dlugosc = dl;
        this.kat = kat;
    }

    public double zwrdl(){
        return this.dlugosc;
    }
    public static void main(String[] args){
        Wektor nowy = Wektor.stworz(1,2,true);
        System.out.println(nowy.zwrdl());

    }
}