public void test(){
        SichtS sichts = new SichtS(); //Line of sight
        Schwert schwert = new Schwert(); //Enemy

        if(Quest.Schwert){   //Interaction with KI, not necessary
            Quest.Schwert = false;  
            if(i<1){
                getWorld().addObject(sichts, 400, 300);
                Schwert = true;
                getWorld().addObject(schwert, 200, 300);
                getWorld().addObject(sichts, 400, 300);
                i++;
            }
        }
        if(Greenfoot.isKeyDown("z")){
            i = 0;
        }
    }

public void Schwert(){
        Schwert schwert = new Schwert();
        if(i<1 && super.Schwert){
            getWorld().addObject(schwert, 200, 300);
            super.Schwert = false;
            i++;
        }
        if(Greenfoot.isKeyDown("z")){
            i = 0;
        }
    }

public void SichtS(){
        SichtS sichts = new SichtS();
        
        
            if(i<1){
                getWorld().addObject(sichts, 400, 300);
                
                i++;
            
        }
        if(Greenfoot.isKeyDown("z")){
            i = 0;
        }
    }

import greenfoot.*;  // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
import java.awt.event.*;
import java.awt.Font;
import java.awt.Color;
import java.awt.Graphics;
import java.lang.Math;

/**
 * Checks if enemy can see the player
 * He can see him if no wall blocks the view or if the player is in range 
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class SichtS extends Sicht
{
   
    public SichtS(){
        setImage(new GreenfootImage(1,1));
       
    }

    /**
     * Act - do whatever the SichtS wants to do. This method is called whenever
     * the 'Act' or 'Run' button gets pressed in the environment.
     */
    public void act() 
    {
        if(!Quest.pause){
            Schwert();
            sehenSchwert1(-100, 100, -100, 100);
            
            //GameOver();
        }
    }   
    int i = 0;
    public void Schwert(){
        Schwert schwert = new Schwert();
        if(i<1 && super.Schwert){
            getWorld().addObject(schwert, 200, 300);
            super.Schwert = false;
            i++;
        }
        if(Greenfoot.isKeyDown("z")){
            i = 0;
        }
    }
    
    public static boolean SichtS = true;
    public void sehenSchwert1(int SYNe, int SYPo, int SXNe, int SXPo){
        //AYNe = negative value of distance on Y-Axe to keep sight true
        //AYPo = positive value of distance on Y-Axe to keep sight true
        //AXNe = negative value of distance on X-Axe to keep sight true
        //AXPo = positive value of distance on X-Axe to keep sight true

        W1 w1 =  (W1) getWorld();
        Schwert schwert = new Schwert();
        Charakter1 charakter1 = new Charakter1();

        Wände wände = (Wände) getOneIntersectingObject(Wände.class);
        int EntfX = CharX-SchwertX; //calculation distance of X coordinates
        int EntfY = CharY-SchwertY; //calculating distance of Y coordinates 
        boolean EntfX1 = false;
        if(SXNe <= EntfX && SXPo >= EntfX ){ //checks if x distance is inside the range for the sigth
            EntfX1 = true;
        }else{
            EntfX1 = false;
        }
        boolean EntfY1 = true;
        if(SYNe <= EntfY && SYPo >= EntfY){ //checks if y distance is inside the range for the sigth
            EntfY1 = true;
        }else{
            EntfY1 = false;
        }
        boolean EntfS = false;
        if(EntfY1 == true && EntfX1 == true){ //checks if y&x distance is inside range of sigth
            EntfS = true;
        }else{
            EntfS = false;
        }

        if(wände !=null || !EntfS){ //checks if sight is blcoked
            SichtS = false;
            SchwertX = schwert.X2;
            SchwertY = schwert.Y2;
            CharX = charakter1.X1;
            CharY = charakter1.Y1;
            int myX = (SchwertX + CharX) / 2; //calculates x coordinate
            int myY = (SchwertY + CharY) / 2; //calculates x coordinate
            setLocation(myX, myY); 
            turnTowards(CharX, CharY); //turning towards player 
            int d = (int)Math.sqrt(Math.pow((SchwertX-CharX),2)+Math.pow((SchwertY-CharY),2)); //calculating the size of the line
            if(d<=0){
                d = 1;
            }
            setImage(new GreenfootImage(d, 1));

            ImgS = getImage();
            ImgS.setColor(Color.GREEN);
            ImgS.drawLine(0, 0, d,0);
             
        }else{
            SichtS = true;
            SchwertX = schwert.X2;
            SchwertY = schwert.Y2;
            CharX = charakter1.X1;
            CharY = charakter1.Y1;
            int myX = (SchwertX + CharX) / 2;
            int myY = (SchwertY + CharY) / 2;
            setLocation(myX, myY);
            turnTowards(CharX, CharY);
            int d = (int)Math.sqrt(Math.pow((SchwertX-CharX),2)+Math.pow((SchwertY-CharY),2));
            if(d<=0){
                d = 1;
            }
            setImage(new GreenfootImage(d, 1));

            ImgS = getImage();
            ImgS.setColor(Color.RED);
            ImgS.drawLine(0, 0, d,0);
           
        }
    }

}

public class LineOfSight extends Actor
{
    public LineOfSight()
    {
        hide();
    }

    public boolean isClearBetween(Actor a, Actor b)
    {
        // set location and rotation
        // set image (line length)
        // get number of intersectors minus line of sight objects  (count)
        // set color of line based on value of 'count'
        // return (count == 2)
    }

    public void hide()
    {
        // set invisible
    }
}

private LineOfSight los = new LineOfSight();

protected void addedToWorld(World world)
{
    los.hide();
    world.addObject(los, 0, 0);
}

public void act()
{
    // ...
    // if player not in range, los.hide(); else
    //     get reference to player in range
    //     if (los.isClearBetween(this, player)), turn towards player
    // ...
}