Snake teleport problem

Eleza · December 2017

Hello guys! I have troubles with this code of Snake. I was trying to teleport the snake to the other side and actually, the code I wrote mostly works (line 114). The problem is once the snake goes through the wall and is teleported to the other side, it doesn't eat the food anymore. I'm a beginner so I don't have any clue of why. Any suggestion? :( Thanks in advance!

    color col=color(0);
    color foodColor = color(0,255,255);
    float speed = 100;
    int cx, cy;
    int moveX = 0;
    int moveY = 0;
    int snakeX = 0;
    int snakeY = 0;
    int foodX = -1;
    int foodY = -1;
    boolean check = true;
    int []snakesX;
    int []snakesY;
    int snakeSize = 1;
    int windowSize = 600;
    boolean gameOver = false;
    PFont Font = createFont("Arial",20, true);

    void setup(){
      size(int(windowSize), int(windowSize),P3D); 
      background(255);
      noStroke();
      speed = 100;
      speed=speed/frameRate;
      snakesX = new int[100];
      snakesY = new int[100];
      cx = width/2;
      cy = height/2; 
      snakeX = cx-5;
      snakeY = cy-5;
      foodX = -1;
      foodY = -1;
      gameOver = false;
      check = true;
      snakeSize =1;
    }
     
    void draw(){
      
      if(speed%5 == 0){
        background(255);
        runGame();}
      speed++;
    }
    
    void reset(){
      snakeX = cx-5;
      snakeY = cy-5;
      gameOver = false;
      check = true;
      snakeSize =1; 
      moveY = 0;
      moveX = 0;
    }
    void runGame(){
      if(gameOver== false){
        drawfood();
        drawSnake();
        snakeMove();
        ateFood();
        checkHitSelf();
      }else{
          String modelString = "game over";
          textAlign (CENTER);
          textFont(Font);
          text(modelString,100,100,40);}
    }
    
    void checkHitSelf(){
       for(int i = 1; i < snakeSize; i++){
           if(snakeX == snakesX[i] && snakeY== snakesY[i]){
              gameOver = true;}
       }  
    }

    void ateFood(){
      if(foodX == snakeX && foodY == snakeY){
         check = true;
         snakeSize++; 
      }
    }
    void drawfood(){
      fill(foodColor);
      while(check){
        int x = (int)random(1,windowSize/10);
        int y =  (int)random(1,windowSize/10);
        foodX = 5+x*10;
        foodY = 5+y*10;
        
        for(int i = 0; i < snakeSize; i++){
           if(x == snakesX[i] && y == snakesY[i]){
             check = true;
             i = snakeSize;
           }else{
             check = false; }}
           }
      rect(foodX-5, foodY-5, 10, 10);
    }
    
    void drawSnake(){
      fill(col);
    
      for(int i = 0; i < snakeSize; i++) {
        int X = snakesX[i];
        int Y = snakesY[i];
        rect(X-5,Y-5,10,10);
      }
       for(int i = snakeSize; i > 0; i--){
        snakesX[i] = snakesX[i-1];
        snakesY[i] = snakesY[i-1];
      }
    }
    
    void snakeMove(){
      snakeX += moveX;
      snakeY += moveY;
    
    if (snakeX > windowSize){snakeX = 0;}              
    if (snakeX < 0){snakeX = windowSize;}      
    if (snakeY < 0){snakeY = windowSize;}        
    if (snakeY > windowSize){snakeY = 0;}      
        
      snakesX[0] = snakeX;
      snakesY[0] = snakeY;
    }
     
    void keyPressed() { 
      if(keyCode == UP){  
        if(snakesY[1] != snakesY[0]-10){moveY = -10; moveX = 0;}}
      if(keyCode == DOWN){
        if(snakesY[1] != snakesY[0]+10){moveY = 10; moveX = 0;}}
      if(keyCode == LEFT){
        if(snakesX[1] != snakesX[0]-10){moveX = -10; moveY = 0;}}
      if(keyCode == RIGHT){
        if(snakesX[1] != snakesX[0]+10){moveX = 10; moveY = 0;}}
      if(keyCode == 'R') {reset();}
    }

kfrajer · December 2017

For debugging, you can use the debugging features in the Processing IDE or use something like the following lines, which needs to be added in your keyPressed() function:

  if (key=='p')
    looping=!looping;

  if (key=='c') {
    println("Snake "+snakesX[0]+", "+snakesY[0]);
    println("\tFood "+foodX+", "+foodY);
  }

Where p is to pause/resume your game and c is for "checking". I notice your values are right even when you wrapped around the screen. Then I notice you have this:

snakeX and snakesX[]

I guess your bug is in drawfood(). Give it a try and see if this solves your problem.

Kf

Eleza · December 2017

Hey kfrajer, thank you for the tip but unfortunately, it didn't work :( I wrote the code again using another one as a reference. In this case, I'm not able to apply the same method for the teleport (line 48) and I don't really understand why. The terminal tells me "The left-hand side of an assignment must be a variable". Any idea? :(

    ArrayList x = new ArrayList(), y = new ArrayList();
    int w = 24, h = 24, bs = 25, dir = 2, foodx = 12, foody = 10;
    int[] dx = {0,0,1,-1}, dy = {1,-1,0,0};
    boolean gameover = false;
    
    int highScore;
    
    // millis keys lock
    boolean keys_broken;
    int time_to_toggle_keys_broken; 
     
     void setup() {
       size (600,600); //size(w*bs,h*bs);
       x.add(5);
       y.add(5);
       
       keys_broken = false;
       time_to_toggle_keys_broken = millis() + int(random(20000, 3000));
     }




     void draw() {
       background(255);
       
       if(millis() > time_to_toggle_keys_broken){
         keys_broken = !keys_broken;
         time_to_toggle_keys_broken = millis() + int(random(20000, 3000));
       }
         
       for(int i = 0; i < w; i++)  line(i*bs, 0, i*bs, height);
       for(int i = 0; i < h; i++)  line(0, i*bs, width, i*bs);
       for(int i = 0; i < x.size(); i++){
         fill(0);
         noStroke();
         rect(x.get(i)*bs, y.get(i)*bs, bs, bs);
       }
       if (!gameover) {
       fill(255,0,0);
       rect(foodx*bs, foody*bs, bs, bs);
       
       if(frameCount%8==0) {
         x.add(0,x.get(0) + dx[dir]);
         y.add(0,y.get(0) + dy[dir]);
       
     //if(x.get(0) < 0 || y.get(0) < 0 || x.get(0) >= w || y.get(0) >= h) gameover = true;
       if(x.get(0) < 0) { x.get(0) = w;}
       if(y.get(0) < 0) { y.get(0) = h;}
       if(x.get(0) >= w) { x.get(0) = 0;}
       if(y.get(0) >= h) { y.get(0) = 0;}
       
       for(int i = 1; i < x.size(); i++) if (x.get(0)==x.get(i) && y.get(0) == y.get(i)) gameover = true;
         
         if(x.get(0)==foodx && y.get(0)==foody) {
           foodx = (int)random(0,w);
           foody = (int)random(0,h);
         }else{
           x.remove(x.size()-1);
           y.remove(y.size()-1);
         }
      }
       if (x.size() > highScore) // If there's a new highscore
        highScore = x.size(); // Change the highscore to the new record
         fill(0);
         textSize(18);
         text("Score " + x.size()*10 + "\nHighscore 680", 20,20);
         
        
     } else {
        fill(0);
        textSize(30);
        textAlign(CENTER);
        text("GAME OVER" + "\nPRESS SPACE", width/2, height/2);
        if(keyPressed && key==' ') {
          x.clear();
          y.clear();
          x.add(5);
          y.add(5);
          gameover = false;
      } 
     } 
    }
     
     void keyPressed() {
       if (keys_broken) {return;
     }
       int newdir = keyCode==DOWN ? 0 : (keyCode==UP ? 1 : (keyCode==RIGHT ? 2 : (keyCode==LEFT ? 3 : -1)));
       if(newdir != -1 && (x.size()

Eleza · December 2017

Solved!

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