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roonie01
roonie01 wrote ...

2021/12/21

need help with getting enemy actor to respawn at original spawn point after touching bottom

roonie01 roonie01

2021/12/21

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import greenfoot.*;  // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
 
/**
 * Write a description of class MyWorld here.
 *
 * @author (your name)
 * @version (a version number or a date)
 */
public class Space extends World
{
    int x;
    int y;
    GreenfootImage background;
    /**
     * Constructor for objects of class MyWorld.
     *
     */
    public Space()
    {   
        // Create a new world with 1600x1200 cells with a cell size of 1x1 pixels.
        super(1600, 1200, 1);
 
        x = getWidth()/2;
        y = getHeight()/2;
 
        addObject(new Rocket(),getWidth()/2,getHeight()/2);
 
        addEnemy();
        addBack();
 
    }
 
    public  void addEnemy()
    {
        int x1 = 1600 / 8;
        for(int i =0;i<=1600;i=i+x1)
    {
 
        addObject( new enemy1(),200+x1,30);
        }
    }
 
    public  void addBack()
    {
        if( enemy1.class == null )
        {
            addEnemy(); 
        }
    }
}
Super_Hippo Super_Hippo

2021/12/21

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Show code for the enemy1 class.
roonie01 roonie01

2021/12/21

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here is source code for enemy1 class
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import greenfoot.*;  // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
 
/**
 * Write a description of class enemy1 here.
 *
 * @author (your name)
 * @version (a version number or a date)
 */
public class enemy1 extends Actor
{
    /**
     * Act - do whatever the enemy1 wants to do. This method is called whenever
     * the 'Act' or 'Run' button gets pressed in the environment.
     */
    int x = 1600 / 8;
    public void act()
    {
        // Add your action code here.
        //add movement
        Movement();
         
        //add collision detection
        Collisions();
         
        //add respawn
        //addBack();
     
    }
 
    public void Movement()
    {
        setLocation(getX(),getY()+10);
    }
 
    public void Collisions()
    {
        if (this.isTouching(Rocket.class))
        {
            //remove enemy
            getWorld().removeObject(this);
            setLocation(getX(),getY());
 
        }
        else if(this.isAtEdge( ))
        {
            //reset enemy to starting position
            getWorld().removeObject(this);
            //setLocation(getX(),getY());
             
        }
    }
     
    }
    
roonie01 roonie01

2021/12/21

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what im trying to do is have 8 enemys spawn across the top of the window and have them progressively move down
Super_Hippo Super_Hippo

2021/12/21

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Instead of removing it from the world, you can just move it upwards to the top again.
roonie01 roonie01

2021/12/21

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ill try that but wont it just get stuck with the enemy at the bottom of the screen and i also need help making it so there are multiple enemys going horizontally across the screen do you know how i can do this
roonie01 roonie01

2021/12/22

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so by moving it upwards you mean make its y value equal the y value defined in world
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if (this.isTouching(Rocket.class))
        {
            //remove enemy
            getWorld().removeObject(this);
            setLocation(getX(),30);
 
        }
        else if(this.isAtEdge( ))
        {
            //reset enemy to starting position
            getWorld().removeObject(this);
            setLocation(getX(),30);
             
        }
danpost danpost

2021/12/22

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Use the following in the class:
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private int x0, y0; // original coordinates
private int vX, vY; // horizontal and vertical speeds
 
protected void addedToWorld(World world)
{
    x0 = getX();
    y0 = getY();
    int speed = 3; // adjust as required
    if (y0 <= 30)  vY = speed; else vX = speed;
}
 
public void act()
{
    setLocation(getX()+vX, getY()+vY);
    if (isAtEdge() || isTouching(Rocket.class)) setLocation(x0, y0);
}
roonie01 roonie01

2021/12/22

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i did your suggestion but now when i hit spacebar top fire the laser it makes my enemy class get stuck at top of screen how can i remove the laser after it hits the enemy class
danpost danpost

2021/12/22

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roonie01 wrote...
i did your suggestion but now when i hit spacebar top fire the laser it makes my enemy class get stuck at top of screen how can i remove the laser after it hits the enemy class
That sounds like Rocket class codes, which was not given.
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