Snake Game Bewegung Problem

Question

Ich versuche, ein Snake-Spiel zu machen, indem Sie ein Tutorial mit Java beobachten. Mein Problem ist, dass die Schlange von Anfang an mit sich selbst kollidiert.

Hier ist meine Hauptklasse "Main.java"

import java.awt.Color; 
import javax.swing.JFrame; 

public class Main { 
    public static void main(String[] args) { 
     JFrame obj = new JFrame(); 
     Gameplay gameplay = new Gameplay(); 
     obj.setBounds(10, 10, 905, 700); 
     obj.setBackground(Color.DARK_GRAY); 
     obj.setResizable(false); 
     obj.setVisible(true); 
     obj.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     obj.add(gameplay); 
    } 
} 

meine Spielklasse Hier namens "Gameplay.java"

import java.awt.*; 
import java.awt.event.*; 
import java.util.Random; 
import javax.swing.*; 

public class Gameplay extends JPanel implements KeyListener, ActionListener { 
    private int[] snakexlength = new int[750]; 
    private int[] snakeylength = new int[750]; 
    private boolean left = false; 
    private boolean right = false; 
    private boolean up = false; 
    private boolean down = false; 

    private ImageIcon rightmouth; 
    private ImageIcon upmouth; 
    private ImageIcon downmouth; 
    private ImageIcon leftmouth; 

    private int lengthofsnake = 3; 

    private Timer timer; 
    private int delay = 100; 

    private ImageIcon snakeimage; 
    private ImageIcon titleImage; 
    private ImageIcon enemyimage; 

    private int[] enemyxpos = { 
     25, 50, 75, 100, 125, 150, 175, 200, 225, 250, 275, 300, 325, 350, 375, 400, 425, 
     450, 475, 500, 525, 550, 575, 600, 625, 650, 675, 700, 725, 750, 775, 800, 825, 850 }; 
    private int[] enemyypos = { 
     75, 100, 125, 150, 175, 200, 225, 250, 275, 300, 325, 350, 375, 400, 425, 450, 475, 
     500, 525, 550, 575, 600, 625 }; 

    private Random random = new Random(); 

    private int xpos = random.nextInt(34); 
    private int ypos = random.nextInt(23); 

    private int score = 0; 
    private int moves = 0; 

    public Gameplay() { 
     addKeyListener(this); 
     setFocusable(true); 
     setFocusTraversalKeysEnabled(false); 
     timer = new Timer(delay, this); 
     timer.start(); 
    } 

    public void paint(Graphics g) { 
     if (moves == 0) { 
      snakexlength[2] = 50; 
      snakexlength[1] = 75; 
      snakexlength[0] = 100; 

      snakeylength[2] = 100; 
      snakeylength[1] = 100; 
      snakeylength[0] = 100; 
     } 

     // draw title image border 
     g.setColor(Color.WHITE); 
     g.drawRect(24, 10, 851, 55); 

     // draw the title image 
     titleImage = new ImageIcon("snaketitle.jpg"); 
     titleImage.paintIcon(this, g, 25, 11); 

     // draw border for gameplay 
     g.setColor(Color.WHITE); 
     g.drawRect(24, 74, 851, 577); 

     // draw background for the gameplay 
     g.setColor(Color.BLACK); 
     g.fillRect(25, 75, 850, 575); 

     // draw scores 
     g.setColor(Color.red); 
     g.setFont(new Font("arial", Font.BOLD, 20)); 
     g.drawString("Score: " + score, 780, 30); 

     // draw length 
     g.setColor(Color.red); 
     g.setFont(new Font("arial", Font.BOLD, 20)); 
     g.drawString("Length: " + lengthofsnake, 780, 50); 

     rightmouth = new ImageIcon("rightmouth.png"); 
     rightmouth.paintIcon(this, g, snakexlength[0], snakeylength[0]); 

     for (int a = 0; a < lengthofsnake; a++) 

     { 
      if (a == 0 && right == true) { 
       rightmouth = new ImageIcon("rightmouth.png"); 
       rightmouth.paintIcon(this, g, snakexlength[a], snakeylength[a]); 
      } 
      if (a == 0 && left == true) { 
       leftmouth = new ImageIcon("leftmouth.png"); 
       leftmouth.paintIcon(this, g, snakexlength[a], snakeylength[a]); 
      } 
      if (a == 0 && up == true) { 
       upmouth = new ImageIcon("upmouth.png"); 
       upmouth.paintIcon(this, g, snakexlength[a], snakeylength[a]); 
      } 
      if (a == 0 && down == true) { 
       downmouth = new ImageIcon("downmouth.png"); 
       downmouth.paintIcon(this, g, snakexlength[a], snakeylength[a]); 
      } 
      if (a != 0) { 
       snakeimage = new ImageIcon("snakeimage.png"); 
       snakeimage.paintIcon(this, g, snakexlength[a], snakeylength[a]); 
      } 

     } 

     enemyimage = new ImageIcon("enemy.png"); 

     if ((enemyxpos[xpos] == snakexlength[0] && enemyypos[ypos] == snakeylength[0])) { 
      scorelength(); 
      ratrandom(); 
      /* 
      * score++; lengthofsnake++; xpos = random.nextInt(34); ypos = 
      * random.nextInt(23); 
      */ 
     } 
     enemyimage.paintIcon(this, g, enemyxpos[xpos], enemyypos[xpos]); 

     for (int b = 1; b < lengthofsnake; b++) { 
      if (snakexlength[b] == snakexlength[0] && snakeylength[0] == snakeylength[0]) { 
       right = false; 
       left = false; 
       up = false; 
       down = false; 
       g.setColor(Color.white); 
       g.setFont(new Font("arial", Font.BOLD, 50)); 
       g.drawString("Game Overs", 300, 300); 
       g.setFont(new Font("arial", Font.BOLD, 20)); 
       g.drawString("Spacebar to AGAIN play", 350, 340); 
      } 
     } 

     g.dispose(); 
    } 

    public void scorelength() { 
     score += 5; 
     lengthofsnake++; 
    } 

    public void ratrandom() { 
     xpos = random.nextInt(34); 
     ypos = random.nextInt(23); 
    } 

    @Override 
    public void keyPressed(KeyEvent e) { 

     if (e.getKeyCode() == KeyEvent.VK_SPACE) { 
      lengthofsnake = 3; 
      score = 0; 
      moves = 0; 
      repaint(); 
     } 
     if (e.getKeyCode() == KeyEvent.VK_RIGHT) { 
      moves++; 
      right = true; 
      if (left == false) { 
       right = true; 
      } else { 
       left = true; 
       right = false; 
      } 
      up = false; 
      down = false; 
     } 
     if (e.getKeyCode() == KeyEvent.VK_LEFT) { 
      moves++; 
      left = true; 
      if (right == false) { 
       left = true; 
      } else { 
       left = false; 
       right = true; 
      } 
      up = false; 
      down = false; 
     } 
     if (e.getKeyCode() == KeyEvent.VK_UP) { 
      moves++; 
      up = true; 
      if (down == false) { 
       up = true; 
      } else { 
       down = true; 
       up = false; 
      } 
      left = false; 
      right = false; 
     } 
     if (e.getKeyCode() == KeyEvent.VK_DOWN) { 
      moves++; 
      down = true; 
      if (up == false) { 
       down = true; 
      } else { 
       up = true; 
       down = false; 
      } 
      left = false; 
      right = false; 
     } 

    } 

    public void actionPerformed(ActionEvent e) { 
     timer.start(); 
     if (right == true) { 
      for (int r = lengthofsnake - 1; r >= 0; r--) { 
       snakeylength[r + 1] = snakeylength[r]; 
      } 

      for (int r = lengthofsnake; r >= 0; r--) { 
       if (r == 0) { 
        snakexlength[r] = snakeylength[r] + 25; 
       } else { 
        snakexlength[r] = snakeylength[r - 1]; 
       } 
       if (snakexlength[r] > 850) { 
        snakexlength[r] = 25; 
       } 
      } 
      repaint(); 
     } 
     if (left == true) { 
      for (int r = lengthofsnake - 1; r >= 0; r--) { 
       snakeylength[r + 1] = snakeylength[r]; 
      } 

      for (int r = lengthofsnake; r >= 0; r--) { 
       if (r == 0) { 
        snakexlength[r] = snakeylength[r] - 25; 
       } else { 
        snakexlength[r] = snakeylength[r - 1]; 
       } 
       if (snakexlength[r] < 25) { 
        snakexlength[r] = 850; 
       } 
      } 
      repaint(); 
     } 
     if (up) { 
      for (int r = lengthofsnake - 1; r >= 0; r--) { 
       snakexlength[r + 1] = snakexlength[r]; 
      } 

      for (int r = lengthofsnake; r >= 0; r--) { 
       if (r == 0) { 
        snakeylength[r] = snakeylength[r] - 25; 
       } else { 
        snakeylength[r] = snakeylength[r - 1]; 
       } 
       if (snakeylength[r] < 75) { 
        snakeylength[r] = 625; 
       } 
      } 
      repaint(); 
     } 
     if (down == true) { 
      for (int r = lengthofsnake - 1; r >= 0; r--) { 
       snakexlength[r + 1] = snakexlength[r]; 
      } 

      for (int r = lengthofsnake; r >= 0; r--) { 
       if (r == 0) { 
        snakeylength[r] = snakexlength[r] + 25; 
       } else { 
        snakeylength[r] = snakeylength[r - 1]; 
       } 
       if (snakeylength[r] > 625) { 
        snakeylength[r] = 75; 
       } 
      } 
      repaint(); 
     } 
    } 

    @Override 
    public void keyReleased(KeyEvent e) { } 

    @Override 
    public void keyTyped(KeyEvent e) { } 
} 

eine Hilfe nötig

Answer 1

das Problem, um herauszufinden, Es ist dieser Teil Ihres Codes, der das Problem verursacht:

if(snakexlength[b] == snakexlength[0]&& snakeylength[0] == snakeylength[0]) 

siehe

Wir können sofort, dass der zweite Teil wird immer wahr ausgewertet (dies sieht aus wie ein Fehler in sich selbst), so ist es eindeutig ein Problem mit dem ersten Teil:

snakexlength[b] == snakexlength[0] 

Es ist nicht sofort klar warum das passiert, aber wenn ich eine Annahme machen müsste, würde ich sagen, dass es etwas damit zu tun hat, wie man die Schlange "initialisiert", da der Fehler augenscheinlich sofort auftritt. Ich habe festgestellt, dass Sie an mehreren Stellen snakexlength[r] = snakexlength[r-1] oder umgekehrt setzen, also ist es wahrscheinlich ein Problem im Kontrollfluss Ihres Programms hier, das bedeutet, dass zwei Indizes in snakexlength kurz gleich sind.