Would someone be able to give me a code for a simple game over end screen once the character loses all of his lives or is taken away from the world
CreepingFuRbalL wrote ...
2013/10/18
Simple game over end screen
What should this game over screen do?
If you just want a game over screen you just need a new class with an image which you add to the world when your character dies.
You could also remove all the objects in the world before doing this or stop the execution of the game.
To stop the game you just need to call Greenfoot.stop();
To remove all the objects you can use this code:
If you also need something else just ask.
if (characterDies()) {//only an example;
World world = getWorld();
world.removeObjects(world.getObjects(null)); //removes all the objects in the world;
world.addObject(new GameOverScreen(), world.getWidth()/2, world.getHeight()/2); //adds the game over screen in the middle of the world;
}
As an alternative, after removing all the actors from the world, you can set a new background image to the world (the game over screen) and call 'Greenfoot.stop();'. This avoids adding another Actor class for something that really has no actions or influential purpose in the world (as far as interacting with other actors).
How would i say if character is !null for it to remove all objects from the game?
To remove all objects in the world you can use this:
But I don't realy understand what you mean by if character is !null. Could you explain that?
World world = getWorld();
if (world != null) {
world.removeObjects(world.getObjects(null));
}Actor Rocket;
Rocket = getOneObjectAtOffset(0,0,Rocket.class);
if (Rocket != null)
{
World world = getWorld();
world.removeObjects(world.getObjects(null));
}How do i add a game over screen to pop up after this has just happened?
You need to create a new class GameOver or any other name, set the image of this actor to the game over screen and add it to the world.
So in line 9 you add this:
world.addObject(new GameOver(), world.getWidth()/2, world.getHeight()/2);
Or, since you removed all the actors, just change the background image of the world to your game over screen:
world.setBackground("game_over.jpg");
Greenfoot.stop();I tried setting up the
world.setBackground("game_over.jpg");
Greenfoot.stop();
but cannot get it to work. I am a Greenfoot newbie, where do I place this in my code (in the class where my collision/stop occurs?) & do I need to create a game_over class under the World class? Thanks!
You had this:
You should be able to get it to work if you place it at line 7 above.
Actor Rocket;
Rocket = getOneObjectAtOffset(0,0,Rocket.class);
if (Rocket != null)
{
World world = getWorld();
world.removeObjects(world.getObjects(null));
// here
}I'm using the Greenfoot book Asteroids game as an example to try this, where do I place this in my code? checkCollision( )?
private void checkCollision()
{
Asteroid a = (Asteroid) getOneIntersectingObject(Asteroid.class);
if(a != null) {
getWorld().addObject(new Explosion(), getX(), getY());
getWorld().removeObject(this);
//here??
}
}
I keep getting "java.lang.NullPointerException" and "java.lang.IllegalStateException: Actor not in world. An attempt was made to use the actor's location while it is not in the world. Either it has not yet been inserted, or it has been removed" errors, so I must be placing this incorrectly in the code.
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