Space Invader

Das Ziel des Spiels ist es, alles Aliens zu treffen, bevor sie unten gelandet sind.

Das Raumschiff kann mit der Volumentasten bewegt werden, mit der Menü-Taste kann man schiessen. Mit Back-Taste kann das Spiel wiederholt werden. Beim Emulator verwendet man anstelle der Lautstärke-Tasten die Taste Ctrl+F5 und Ctrl+F6.

Das Spiel ist im Querformat programmiert. Der Emulator lässt sich mit den Tasten Ctrl+F11 bzw. Ctrl+F12 in den Querformati umdrehen un wieder zurücksetzte.

Beispiel im Online-Editor bearbeiten

App installieren auf Smartphone oder Tablet

QR-Code

Programmcode downloaden (SpaceInvader.zip)

Programmcode:

// SpaceInvader.java

package app.spaceinvader;

import ch.aplu.android.*;
import android.graphics.*;

public class SpaceInvader extends GameGrid
{
  private final static int nbRows = 3;
  private final static int nbCols = 9;
  protected final static int dx = 6;
  protected final static int nbHorzCells = 81;
  protected final static int nbVertCells = 51;
  private final static int cellSize = 5;

  public SpaceInvader()
  {
    super(nbHorzCells, nbVertCells, cellSize, Color.TRANSPARENT);
    setScreenOrientation(LANDSCAPE);
  }

  public void main()
  {
    setSimulationPeriod(50);
    getBg().drawText("Button actions:", new Point(30, 10));
    getBg().drawText("VOLUME to move spaceship", new Point(30, 40));
    getBg().drawText("MENU to shoot", new Point(30, 60));
    getBg().drawText("BACK to restart", new Point(30, 80));
    getBg().drawText("Please wait for game start...", new Point(60, 120));
    refresh();
    delay(10000);

    init();
  }

  protected void init()
  {
    getBg().clear(Color.BLACK);
    removeAllActors();
    for (int i = 0; i < nbRows; i++)
    {
      for (int k = 0; k < nbCols; k++)
      {
        Alien alien = new Alien();
        addActor(alien, new Location(nbHorzCells / 2 - (nbCols / 2) * dx + k * dx, 10 + 5 * i));
      }
    }
    SpaceShip ss = new SpaceShip(this);
    addNavigationListener(ss);
    addActor(ss, new Location(nbHorzCells / 2, 45));
    doRun();
  }
}

// --------------class Alien -----------
class Alien extends Actor
{
  private final int maxNbSteps = 16;
  private int nbSteps;

  public Alien()
  {
    super("alien");
    setSlowDown(7);
  }

  public void reset()
  {
    nbSteps = 7;
  }

  public void act()
  {

    if (nbSteps < maxNbSteps)
    {
      move(SpaceInvader.dx / 2);
      nbSteps++;
    }
    else
    {
      nbSteps = 0;
      int angle;
      if (getDirection() == 0)
        angle = 90;
      else
        angle = -90;
      turn(angle);
      move();
      turn(angle);
    }
    if (getLocation().y > 90)
      removeSelf();
  }
}

// --------------class Ship -------------

class SpaceShip extends Actor implements GGNavigationListener
{
  private int nbShots = 0;
  private SpaceInvader app;

  public SpaceShip(SpaceInvader app)
  {
    super("spaceship");
    this.app = app;
  }

  public void act()
  {
    GameGrid gg = gameGrid;
    Location location = getLocation();
    if (gg.getNumberOfActorsAt(location, Alien.class) > 0)  // Spaceship hit
    {
      gg.removeAllActors();
      gg.addActor(new Actor("explosion2"), location);
      gg.getBg().drawText("Press 'BACK' to play again", new Point(30, 50));
      gg.doPause();
      return;
    }
    if (gg.getNumberOfActors(Alien.class) == 0) // All aliens dead
    {
      gg.removeAllActors();
      gg.getBg().drawText("Game over. You survive.", new Point(30, 10));
      gg.getBg().drawText("Number of shots: " + nbShots, new Point(30, 30));
      gg.getBg().drawText("Press 'BACK' to play again", new Point(30, 50));
      gg.doPause();
    }
  }

  public void navigationEvent(GGNavigationEvent event)
  {
    switch (event)
    {
      case VOLUME_INCREASE_REPEAT:
        setDirection(Location.WEST);
        if (getX() > 5)
          move(SpaceInvader.dx);
        break;
      case VOLUME_DECREASE_REPEAT:
        setDirection(Location.EAST);
        if (getX() < SpaceInvader.nbHorzCells - 5)
          move(SpaceInvader.dx);
        break;
      case MENU_DOWN:
        Bomb bomb = new Bomb();
        gameGrid.addActor(bomb, getLocation());
        nbShots++;
        break;
      case BACK_DOWN:
        app.doPause();
        app.init();
        break;

    }
  }
}

// --------- class Bomb -------------------------

class Bomb extends Actor
{
  public Bomb()
  {
    super("bomb");
  }

  public void reset()
  {
    setDirection(Location.NORTH);
  }

  public void act()
  {
    // Acts independently searching a possible target and bring it to explosion
    move();
    if (gameGrid.removeActorsAt(getLocation(), Alien.class) != 0)
    {
      Explosion explosion = new Explosion();
      gameGrid.addActor(explosion, getLocation());
      removeSelf();
      return;
    }
    if (getLocation().y < 5)
      removeSelf();
  }
}

// ------------------- class Explosion ------------
class Explosion extends Actor
{
  public Explosion()
  {
    super("explosion1");
    setSlowDown(3);
  }

  public void act()
  {
    removeSelf();
  }
}

Game-Apps für Smartphones und Tablets	English
Bern University oh Teacher Education

Game-Apps für Smartphones und Tablets

Space Invader