GameHUD.java

package com.angrykings;

import org.andengine.engine.camera.hud.HUD;
import org.andengine.entity.Entity;
import org.andengine.entity.modifier.AlphaModifier;
import org.andengine.entity.modifier.DelayModifier;
import org.andengine.entity.modifier.SequenceEntityModifier;
import org.andengine.entity.primitive.Rectangle;
import org.andengine.entity.sprite.AnimatedSprite;
import org.andengine.entity.text.Text;
import org.andengine.input.touch.TouchEvent;
import org.andengine.opengl.font.Font;
import org.andengine.util.color.Color;

/**
 * GameHUD
 * <p/>
 * Manages the HUD (head up display)
 *
 * @author Shivan Taher <zn31415926535@gmail.com>
 * @date 31.05.13
 */
public class GameHUD extends HUD {
	private final AnimatedSprite whiteFlagButton;

	private final Font statusFont;
	private final Font playerNameFont;

	private Runnable onAimTouched;
	private Runnable onWhiteFlagTouched;

	private final LifeBar leftLifeBar;
	private final LifeBar rightLifeBar;

	private final Text leftPlayerNameText;
	private final Text rightPlayerNameText;
	private final Text statusText;

	private final static int MAX_TEXT_LENGTH = 256;
	private final static int HUD_MARGIN = 20;
	private final static int BUTTON_OFFSET_Y = 32;
	private final static float PLAYER_NAME_ALPHA = 0.7f;

	/**
	 * This entity represents a slider to indicate the height of the players castle.
	 */
	public class LifeBar extends Entity {
		public final static float BAR_HEIGHT = 6;
		public final static float BAR_WIDTH = 200;
		private final static float BAR_ALPHA = 0.5f;

		private final Rectangle barFrame;
		private final Rectangle barFilled;
		private final boolean isLeft;

		private LifeBar(float x, float y, boolean isLeft) {
			this(x, y, new Color(0.5f, 0.5f, 0.5f, LifeBar.BAR_ALPHA), new Color(1, 0, 0, LifeBar.BAR_ALPHA), isLeft);
		}

		private LifeBar(float x, float y, Color frameColor, Color lifeColor, boolean isLeft) {
			super(x, y);

			GameContext gc = GameContext.getInstance();

			this.isLeft = isLeft;

			this.barFrame = new Rectangle(0, 0, BAR_WIDTH, LifeBar.BAR_HEIGHT, gc.getVboManager());
			this.barFrame.setColor(frameColor);
			this.attachChild(this.barFrame);

			this.barFilled = new Rectangle(isLeft ? 0 : BAR_WIDTH, 0, isLeft ? LifeBar.BAR_WIDTH : -LifeBar.BAR_WIDTH, LifeBar.BAR_HEIGHT, gc.getVboManager());
			this.barFilled.setColor(lifeColor);
			this.attachChild(this.barFilled);
		}

		public void setValue(float value) {
			this.barFilled.setWidth((isLeft ? 1 : -1) * LifeBar.BAR_WIDTH * Math.min(Math.max(value, 0.0f), 1.0f));
		}
	}

	public GameHUD() {
		super();

		GameContext gc = GameContext.getInstance();
		ResourceManager rm = ResourceManager.getInstance();

		this.statusFont = rm.getStatusFont();
		this.playerNameFont = rm.getPlayerNameFont();

		//
		// white flag button
		//

		this.whiteFlagButton = new AnimatedSprite(
				GameConfig.CAMERA_WIDTH - rm.getWhiteFlagButtonTexture().getWidth() - GameHUD.HUD_MARGIN,
                GameConfig.CAMERA_HEIGHT - rm.getWhiteFlagButtonTexture().getHeight() - GameHUD.HUD_MARGIN,
				rm.getWhiteFlagButtonTexture(), gc.getVboManager()) {
			@Override
			public boolean onAreaTouched(TouchEvent pSceneTouchEvent, float pTouchAreaLocalX, float pTouchAreaLocalY) {
				if (pSceneTouchEvent.isActionUp()) {
					if (onWhiteFlagTouched != null)
						onWhiteFlagTouched.run();
				}
				return true;
			}
		};

        this.whiteFlagButton.setAlpha(0.8f);

		this.attachChild(this.whiteFlagButton);

		//
		// player slider
		//

		this.leftLifeBar = new LifeBar(
				GameHUD.HUD_MARGIN,
				GameHUD.HUD_MARGIN + playerNameFont.getLineHeight(), // GameConfig.CAMERA_HEIGHT / 2 - LifeBar.BAR_HEIGHT / 2,
				true
		);
		this.leftLifeBar.setValue(0.5f);
		this.attachChild(this.leftLifeBar);

		this.rightLifeBar = new LifeBar(
				GameConfig.CAMERA_WIDTH - LifeBar.BAR_WIDTH - GameHUD.HUD_MARGIN,
				GameHUD.HUD_MARGIN + playerNameFont.getLineHeight(), //GameConfig.CAMERA_HEIGHT / 2 - LifeBar.BAR_HEIGHT / 2,
				false
		);
		this.rightLifeBar.setValue(0.9f);
		this.attachChild(this.rightLifeBar);

		//
		// players names
		//

		this.leftPlayerNameText = new Text(0, 0, this.playerNameFont, "", GameHUD.MAX_TEXT_LENGTH, gc.getVboManager());
		this.leftPlayerNameText.setAlpha(GameHUD.PLAYER_NAME_ALPHA);
		this.attachChild(this.leftPlayerNameText);

		this.rightPlayerNameText = new Text(0, 0, this.playerNameFont, "", GameHUD.MAX_TEXT_LENGTH, gc.getVboManager());
		this.rightPlayerNameText.setAlpha(GameHUD.PLAYER_NAME_ALPHA);
		this.attachChild(this.rightPlayerNameText);

		this.statusText = new Text(0, 0, this.statusFont, "", GameHUD.MAX_TEXT_LENGTH, gc.getVboManager());
		this.attachChild(this.statusText);

		this.setLeftPlayerName("Left Player");
		this.setRightPlayerName("Right Player");
		this.setStatus("Status Message");
	}

	public void setOnWhiteFlagTouched(Runnable onWhiteFlagTouched) {
		this.onWhiteFlagTouched = onWhiteFlagTouched;
		this.registerTouchArea(this.whiteFlagButton);
	}

	public AnimatedSprite getWhiteFlagButton() {
		return whiteFlagButton;
	}

	public LifeBar getRightLifeBar() {
		return rightLifeBar;
	}

	public LifeBar getLeftLifeBar() {
		return leftLifeBar;
	}

	public void setLeftPlayerName(String name) {
		this.leftPlayerNameText.setText(name);
		this.leftPlayerNameText.setPosition(
				GameHUD.HUD_MARGIN,
				GameHUD.HUD_MARGIN
		);
	}

	public void setRightPlayerName(String name) {
		this.rightPlayerNameText.setText(name);
		this.rightPlayerNameText.setPosition(
				GameConfig.CAMERA_WIDTH - this.rightPlayerNameText.getWidth() - GameHUD.HUD_MARGIN,
				GameHUD.HUD_MARGIN
		);
	}

	public void setStatus(String status) {
		this.statusText.registerEntityModifier(
				new SequenceEntityModifier(
						new AlphaModifier(0.3f, 0.0f, 1.0f),
						new DelayModifier(1.5f),
						new AlphaModifier(0.5f, 1.0f, 0.0f)
				)
		);

		this.statusText.setText(status);
		this.statusText.setPosition(
				GameConfig.CAMERA_WIDTH / 2 - statusText.getWidth() / 2,
				GameConfig.CAMERA_HEIGHT / 2 - statusText.getHeight() / 2
		);
	}
}