GameOverHud.java

package com.jonathan.survivor.hud;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.Color;
import com.badlogic.gdx.graphics.GL10;
import com.badlogic.gdx.scenes.scene2d.InputEvent;
import com.badlogic.gdx.scenes.scene2d.Stage;
import com.badlogic.gdx.scenes.scene2d.ui.Image;
import com.badlogic.gdx.scenes.scene2d.ui.Label;
import com.badlogic.gdx.scenes.scene2d.ui.Label.LabelStyle;
import com.badlogic.gdx.scenes.scene2d.utils.ClickListener;
import com.jonathan.survivor.World;

/*
 * An instance of this class will display the HUD whilst in EXPLORATION mode.
 */

public class GameOverHud extends Hud
{	
	/** Holds the color which overlays the screen below the GameOverHud. */
	public static final Color OVERLAY_COLOR = new Color(Color.BLACK);
	
	/** Stores how long the GameOverHud is displayed for before being brought back to the main menu. */
	public static final float DISPLAY_TIME = 3;
	
	/** Stores the text which displays "Game Over". */
	private Label gameOverLabel;
	
	/** Stores the listener used to listen for events from the arrow buttons. */
	private ButtonListener buttonListener;
	
	/** Holds the amount of time the GameOverHud has been displayed. Once a certain time period elapses, the player is redirected to the MainMenu. */
	private float playTime;
	
	/** Accepts the stage where 2d widgets will be drawn and placed, and the world, which will receive information about
	 *  button presses. */
	public GameOverHud(Stage stage, World world)
	{
		super(stage, world);
	
		//Creates the "Game Over" label from a pre-defined LabelStyle.
		gameOverLabel = new Label("Game Over", assets.gameOverLabelStyle);
		
		//Creates a new listener for the buttons
		buttonListener = new ButtonListener();
	}

	@Override
	public void draw(float deltaTime) 
	{		
		//Clears the screen with the overlay color so that the game is hidden behind the game over HUD.
		Gdx.gl.glClearColor(OVERLAY_COLOR.r, OVERLAY_COLOR.g, OVERLAY_COLOR.b, OVERLAY_COLOR.a);
		Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT);
		
		//Draws the widgets to the screen.
		super.draw(deltaTime);		
		
		//Increments the playTime of the GameOverHud to keep track of how long the HUD has been showing.
		playTime += deltaTime;
		
		//Checks if the GameOverHud has been displaying for long enough. If so, the player is brought back to the main menu.
		checkDone();
	}
	
	/** Called to check if the GameOverHud has been displaying for long enough. If so, the player is brought back to the main menu. */
	private void checkDone() 
	{
		//If the GameOverHud has been showing for longer than DISPLAY_TIME
		if(playTime > DISPLAY_TIME)
		{
			//Informs the GameScreen that the GameOverHud has finished displaying, and the player is dead.
			hudListener.gameOverHudFinished();
		}
	}

	class ButtonListener extends ClickListener
	{
		/** Delegates when a button is pressed. */
		@Override
		public void clicked(InputEvent event, float x, float y)
		{
			
		}
	}

	/** Called when the stage must be reset to draw the widgets contained in this class. Used when the stage needs to be re-purposed. Also called when the
	 *  screen is resized to re-place the widgets. */
	@Override
	public void reset(float guiWidth, float guiHeight) 
	{
		//Clears the stage and all its widgets to re-purpose the stage to draw the exploration HUD.
		stage.clear();
		
		//Sets the bottom-left position of the gameOverLabel so that the label is displayed at the center of the stage.
		gameOverLabel.setPosition(stage.getWidth()/2 - gameOverLabel.getWidth()/2, stage.getHeight()/2 - gameOverLabel.getHeight()/2);
		
		//Adds the "Game Over" label to the stage.
		stage.addActor(gameOverLabel);
	}	
}