Cara membuat bola pantul dari greenfoot

Cara Menmbuat Bola Pantul Dari GreenFoot

Tutorial Greenfoot kali ini saya akan membuat game Bola Pantul.

1. Buatlah project baru beri nama Bola pantul/Bounce Ball
2. Buat class World baru dengan cara klik kanan>>new subclass>>masukkan nama class, begitu juga dengan class actor caranya sama. Tampilannya akan seperti di bawah.
3. Masukkan kode di bawah pada class bg (nama subclass world)import greenfoot.*;
   import javax.swing.JOptionPane;
   /**
   * Write a description of class bg here.
   *
   * @author Aldio
   * @version trial
   */
   public class bg extends World
   {
   counter counter = new counter(“Skor: “);
   skor skor = new skor();
   player player = new player();
   ball ball = new ball();
   tembok tembok = new tembok();
   tembok tembok1 = new tembok();
   tembok tembok2 = new tembok();
   tembok tembok3 = new tembok();
   tembok tembok4 = new tembok();
   /**
   * Constructor for objects of class bg.
   *
   */
   public bg()
   {
   // Create a new world with 600×400 cells with a cell size of 1×1 pixels.
   super(600, 400, 1);
   setPaintOrder(counter.class, player.class, skor.class, tembok.class, ball.class);
   addObject(counter,155,380);
   //meltakkan posisi caption skor
   addObject(player,321,360);
   //meletakkan posisi tembok pemantul
   addObject(ball,320,335);
   //meletakkan posisi bola
   addObject(tembok,100,35);
   //meletakkan posisi tembok
   addObject(tembok1,170,75);
   //meletakkan posisi tembok
   addObject(tembok2,200,135);
   //meletakkan posisi tembok
   addObject(tembok3,400,135);
   //meletakkan posisi tembok
   addObject(tembok4,500,35);
   //meletakkan posisi tembok
   prepare();
   }
   
   
   public void act(){
   if(Greenfoot.getRandomNumber(1000)<4){
   addObject(new tembok(),Greenfoot.
   getRandomNumber(100),Greenfoot.
   getRandomNumber(170)); //menampilkan class tembok agar tampil secara acak
   }
   
   
   if(Greenfoot.isKeyDown(“space”))
   {//menggunakan tombol spasi untuk menghentikan sementara game
   Greenfoot.stop();
   }
   }
   public void tambah(){
   counter.add(5);
   }
   /**
   * Called when game is up. Stop running and display score
   */
   public void selesai()
   {
   addObject(new skor(counter.getValue()), getWidth()/2, getHeight()/2);
   //menampilkan pesan “Game Over dan skor terakhir yg diperoleh”
   }
   
   
   /**
   * Prepare the world for the start of the program. That is: create the initial
   * object and add them to the world
   */
   private void prepare()
   {
   }
   }
   Lalu klick compile
4. Masukkan juga kode di bawah ini pada class ball agar bola dapat bergerak dan memantul pada dindingimport greenfoot.*;
   /**
   * Write a description of class ball here.
   *
   * @author Aldio
   * @version trial
   */
   public class ball extends Actor
   {
   int x=3;
   int y=3;
   /**
   * Act – do whatever the ball wants to do. This method is called whenever
   * the ‘Act’ or ‘Run’ button gets pressed in the environment.
   */
   public void act()
   {
   // Add your action code here.
   gerak();
   kanan();
   kiri();
   atas();
   player();
   }
   public void gerak()
   {
   setLocation(getX()+x,getY()+y);
   }
   public void kanan()
   {
   if(getX()>=getWorld().getWidth()-getImage().getWidth()/2){
   x=x-1;
   }
   }
   public void kiri()
   {
   if(getX()<=getImage().getWidth()/2){
   x=x+1;
   }
   }
   public void atas()
   {
   Actor tembok=getOneIntersectingObject(tembok.class);
   if(getY()<=getImage(). getHeight()/2){
   y=y+1;
   }
   if(tembok !=null){
   ((bg)getWorld()).tambah();
   //jika subclass ball berhasil menabrak tembok dan pecah, akan ditambahkan poinnya
   getWorld(). removeObject(tembok);
   }
   }
   public void player()
   {
   Actor box=getOneIntersectingObject(player.class);
   if(box !=null){
   y=y-1;
   }
   if(getY()>=getWorld().getHeight()-getImage().getHeight()/2){
   Greenfoot.stop();
   ((bg)getWorld()).selesai();
   }
   }
   }
5. Masukkan juga kode di bawah ini pada class counterimport greenfoot.*;
   import java.awt.Font; //Tambahkan Font
   /**
   * Write a description of class counter here.
   *
   * @author Aldio
   * @version trial
   */
   public class counter extends Actor
   {
   private int value = 0;
   private int target = 0;
   private String text;
   private int stringLength;
   public counter()
   {
   this(“”);
   }
   public counter (String prefix)
   {
   text = prefix;
   stringLength = (text.length() + 2) * 16;
   setImage (new GreenfootImage(stringLength, 24));
   GreenfootImage image = getImage();
   Font font = image.getFont();
   image.setFont (font.deriveFont(24.0F)); // use larger font
   updateImage ();
   }
   public void act() {
   if(value < target) {
   value++;
   updateImage();
   }
   else if(value > target) {
   value–;
   updateImage();
   }
   }
   public void add(int score)
   {
   target += score;
   }
   public void subtract(int score)
   {
   target -= score;
   }
   public int getValue()
   {
   return value;
   }
   /**
   * make the image
   */
   private void updateImage()
   {
   GreenfootImage image = getImage();
   image.clear();
   image.drawString(text + value, 1,18);
   }
   }
6. Masukkan juga kode di bawah ini pada class skorimport greenfoot.*;
   import java.awt.Color;
   import java.awt.Font;
   import java.util.Calendar;
   /**
   * Write a description of class skor here.
   *
   * @author Aldio
   * @version trial
   */
   public class skor extends Actor
   {
   /**
   * Act – do whatever the skor wants to do. This method is called whenever
   * the ‘Act’ or ‘Run’ button gets pressed in the environment.
   */
   public static final float FONT_SIZE = 48.0f;
   public static final int WIDTH = 400;
   public static final int HEIGHT = 300;
   /**
   * Create a score board with dummy result fot testing.
   */
   public skor() {
   this (25);
   }
   /**
   * Create a score board for the final result.
   */
   public skor(int score) {
   makeImage(“GAME OVER”, “Skor Anda: “, score);
   }
   /**
   * Make the score board image.
   */
   private void makeImage(String title, String prefix, int score) {
   GreenfootImage image = new GreenfootImage(WIDTH, HEIGHT);
   image.setColor(new Color(14, 14, 89, 160));
   image.fillRect(0, 0, WIDTH, HEIGHT);
   image.setColor(new Color(255, 255, 255, 100));
   image.fillRect(5, 5, WIDTH-10, HEIGHT-10);
   Font font = image.getFont();
   font = font.deriveFont(FONT_SIZE);
   image.setFont (font);
   image.setColor (Color.WHITE);
   image.drawString(title, 60, 100);
   image.drawString (prefix + score, 60, 200);
   setImage (image);
   }
   public void act()
   {
   //Add your action code here.
   }
   }
7. Masukkan juga kode di bawah ini pada class playerimport greenfoot.*;
   /**
   * Write a description of class player here.
   *
   * @author Aldio
   * @version trial
   */
   public class player extends Actor
   {
   /**
   * Act – do whatever the player wants to do. This method is called whenever
   * the ‘Act’ or ‘Run’ button gets pressed in the environment.
   */
   public player()
   {
   // Add your action code here.
   GreenfootImage img=getImage();
   img.scale(img.getWidth()+30,img.getHeight()-60);
   setImage(img);
   }
   public void act(){
   if(Greenfoot.isKeyDown(“left”)){
   move(-3);
   }
   if(Greenfoot.isKeyDown(“right”)){
   move(3);
   }
   if(Greenfoot.mouseMoved(null)){
   MouseInfo mouse = Greenfoot.getMouseInfo();
   setLocation(mouse.getX(),360);
   }
   }
   }

setelah semuanya di compile dan hasilnya seperti gambar di bawah