Gamegrid

Frogger

Ziel: Ein Frosch soll die beiden Strassen überqueren, ohne überfahren zu werden.

Die Steuerung erfolgt mit den Cursortasten:

Der Klassendesign besteht aus drei Klassen (Frogger, Frog und Car). Für den Online-Editor müssen alle drei Klassen im gleichen Editorfenster bearbeitet werden. Eigene Bilder können Sie auf dem lokalen Rechner im Verzeichnis userhome/gamegrid/sprites ablegen. Diese werden beim Erstellen vom jar-File automatisch mitverpackt.

Programmcode downloaden: Frogger.zip

Programmcode

// Frogger.java

import ch.aplu.jgamegrid.*;
import java.awt.event.KeyEvent;
import java.awt.*;

public class Frogger extends GameGrid
{
  public Frogger()
  {
    super(800, 600, 1, null, "sprites/lane.gif", false);
    setSimulationPeriod(80);
    Frog frog = new Frog();
    addActor(frog, new Location(400, 560), Location.NORTH);
    playSound(GGSound.DUMMY);
    frog.setCollisionRectangle(new Point(0, 0), 30, 30);

    Car[] cars = new Car[20];
    for (int i = 0; i < 10; i++)
    {
      cars[i] = new Car("sprites/car" + i + ".gif");
      cars[i].setHorzMirror(true);
      frog.addCollisionActor(cars[i]);
    }
    for (int i = 0; i < 10; i++)
    {
      cars[10 + i] = new Car("sprites/car" + i + ".gif");
      frog.addCollisionActor(cars[10 + i]);
    }

    for (int i = 0; i < 5; i++)
      addActor(cars[i], new Location(350 * i, 90), Location.WEST);
    for (int i = 5; i < 10; i++)
      addActor(cars[i], new Location(350 * (i - 5), 350), Location.WEST);
    for (int i = 10; i < 15; i++)
      addActor(cars[i], new Location(350 * (i - 10), 220), Location.EAST);
    for (int i = 15; i < 20; i++)
      addActor(cars[i], new Location(350 * (i - 15), 480), Location.EAST);

    addKeyRepeatListener(frog);
    setTitle("Frogger -- Use 4 cursor keys to move the frog");
    show();
    doRun();
  }

  public static void main(String[] args)
  {
    new Frogger();
  }
}

//---------------class Car.java ---------------------------------------

class Car extends Actor
{
  public Car(String imagePath)
  {
    super(imagePath);
  }

  public void act()
  {
    move();
    if (getLocation().x < -100)
      setLocation(new Location(1650, getLocation().y));
    if (getLocation().x > 1650)
      setLocation(new Location(-100, getLocation().y));
  }
}

// ---------------- class Frog.java-----------------------------------

class Frog extends Actor implements GGKeyRepeatListener
{
  private boolean isFinished = false;

  public Frog()
  {
    super("sprites/frog.gif");
  }

  public void act()
  {
    if (getLocation().y < 25)
    {
      if (!isFinished)
      {
        isFinished = true;
        gameGrid.playSound(GGSound.FROG);
      }
    }
    else
      isFinished = false;
  }

  public void keyRepeated(int keyCode)
  {
    switch (keyCode)
    {
      case KeyEvent.VK_UP:
        if (!isFinished)
          setLocation(new Location(getLocation().x, getLocation().y - 5));
        break;
      case KeyEvent.VK_DOWN:
        setLocation(new Location(getLocation().x, getLocation().y + 5));
        break;
      case KeyEvent.VK_LEFT:
        setLocation(new Location(getLocation().x - 5, getLocation().y));
        break;
      case KeyEvent.VK_RIGHT:
        setLocation(new Location(getLocation().x + 5, getLocation().y));
        break;
    }
  }

  public int collide(Actor actor1, Actor actor2)
  {
    gameGrid.playSound(GGSound.BOING);
    setLocation(new Location(400, 560));
    setDirection(Location.NORTH);
    return 0;
  }
}