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northscreen.md

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Creating the North screen

This screen will kill the player. Sounds awful, but this part of the tutorial will show you how you can force the player to restart the game.

Note that this screen does NOT need to implement Resettable, as it has no menu items that are hidden/unhidden.

We will customize the show and handleInput methods.

Below is the show method:

@Override
protected void show() {
    System.out.println(ConsoleColors.ANSI_CLEAR);
    System.out.println("You have entered the north room." +
            "\nYou fall into a pit of spikes and die. Sorry! :(");
    super.show();
}

And here is the handleInput method:

    @Override
    protected void handleInput() {
        Game.getInstance().getInput().getString("Press Enter to continue.");

        MyGame.killPlayer();
        
        ScreenManager.addScreen(new MainScreen());
    }

Notice that we are calling a method specific to our game for killing the player. At its simplest, removing the current player object from the game should remove the player object from the Game's state map. We will add this and another method statically to MyGame for convenience. Anytime you want to kill the player, call MyGame.killPlayer() and add MainScreen to the ScreenManager. Anytime you want to access the player's information, call MyGame.getPlayer().

The getPlayer method calls Game's getStateItem method which fetches an object from the Game's state hashmap. Because any Object can be stored in the Game's hashmap, you must tell Java the data type of the object you want from the hashmap. That is the reason for the Player.class argument. The call to the ScreenManager.emptyCache method clears the screen cache, so that ALL game screens start over with freshly initialized data, including the MainMenu screen.

Add these two methods to MyGame.java.

public static Player getPlayer() {
    return Game.getInstance().getStateItem("player", Player.class);
}

public static void killPlayer() {
    System.out.println("Removing player " + getPlayer().getName() + "...");
    Game.getInstance().removeStateItem("player");
    // emptyCache() removes ALL screens from the cache,
    // meaning that all screens will start over with a fresh new object
    // (e.g., all hidden menu items that were previously revealed will be hidden again)
    ScreenManager.emptyCache();
}

Lastly, remove the northStub method from EastScreen and replace the following line in EastScreen:

menu.addItem("Go north", northStub);

with

menu.addItem("Go north", new NorthScreen());

Below is the complete NorthScreen class. You should be able to run the game and go north from the east room and be killed. Smashing!

NorthScreen.java

package docrob.cag.mygame.screens;

import docrob.cag.framework.screens.Screen;
import docrob.cag.framework.screens.ScreenManager;
import docrob.cag.framework.state.Game;
import docrob.cag.framework.utils.ConsoleColors;

public class NorthScreen extends Screen {
    @Override
    protected void show() {
        System.out.println(ConsoleColors.ANSI_CLEAR);
        System.out.println("You have entered the north room." +
                "\nYou fall into a pit of spikes and die. Sorry! :(");
        super.show();
    }

    @Override
    protected void handleInput() {
        Game.getInstance().getInput().getString("Press Enter to continue.");

        MyGame.killPlayer();

        ScreenManager.addScreen(new MainScreen());
    }
}

Next: the west screen