How to make the snake not move constantly

Processing Coding Questions
1

Hi, How to make the snake not move constantly?

int angle=0;
int snakesize=10;
int time=0;
int[] headx= new int[2500];
int[] heady= new int[2500];
int applex=(round(random(47))+1)*8;
int appley=(round(random(47))+1)*8;
boolean redo=true;
boolean stopgame=false;            //These are the variables necessary to plot the game characters and boundaries.

void setup()
{
  restart();
  size(400,400);            //The size of the window.
  textAlign(CENTER);
}

void draw()
{
  if (stopgame)          
  {
  }
  
  else
  {
  time+=1;
  fill(255,0,0);
  stroke(0);
  rect(applex,appley,8,8);
  fill(0);
  stroke(0);
  rect(0,0,width,8);
  rect(0,height-8,width,8);
  rect(0,0,8,height);
  rect(width-8,0,8,height);        
  
  if ((time % 5)==0)
  {
    travel();
    display();
    checkdead();              
  }
  }
}

void keyPressed()                    // The controls are set to up, down, left and right arrows of the keyboard. you can change them accordingly.
{
  if (key == CODED)
  {
    if (keyCode == UP && angle!=270 && (heady[1]-8)!=heady[2])
    {
      angle=90;
    }
    if (keyCode == DOWN && angle!=90 && (heady[1]+8)!=heady[2])
    {
      angle=270;
    }if (keyCode == LEFT && angle!=0 && (headx[1]-8)!=headx[2])
    {
      angle=180;
    }if (keyCode == RIGHT && angle!=180 && (headx[1]+8)!=headx[2])
    {
      angle=0;
    }
    if (keyCode == SHIFT)
    {
      restart();
    }
  }
}

void travel()
{
  for(int i=snakesize;i>0;i--)                    // loop for the creation of snake.
  {
    if (i!=1)
    {
      headx[i]=headx[i-1];
      heady[i]=heady[i-1];
    }
    else
    {
      switch(angle)
      {
        case 0:
        headx[1]+=8;
        break;
        case 90:
        heady[1]-=8;
        break;
        case 180:
        headx[1]-=8;
        break;
        case 270:
        heady[1]+=8;
        break;
      }
    }
  }
  
}

void display()            // displaying the snake as well as the apple.
{
  if (headx[1]==applex && heady[1]==appley)
  {
    snakesize+=round(random(3)+1);
    redo=true;
    while(redo)
    {
      applex=(round(random(47))+1)*8;
      appley=(round(random(47))+1)*8;
      for(int i=1;i<snakesize;i++)
      {     
        if (applex==headx[i] && appley==heady[i])
        {
          redo=true;
        }
        else
        {
          redo=false;
          i=1000;
        }
      }
    }
  }
  stroke(255,255,255);
  fill(0);
  rect(headx[1],heady[1],8,8);
  fill(255);
  rect(headx[snakesize],heady[snakesize],8,8);
}

void checkdead()          //end game method to check if the snake is dead or alive.
{
  for(int i=2;i<=snakesize;i++)
  {
    if (headx[1]==headx[i] && heady[1]==heady[i])
    {
      fill(255);
      rect(125,125,160,100);
      fill(0);
      text("GAME OVER",200,150);
      text("Score:  "+str(snakesize-1)+" apples eaten",200,175);
      text("Press SHIFT to RESTART",200,200);
      stopgame=true;
    }
    if (headx[1]>=(width-8) || heady[1]>=(height-8) || headx[1]<=0 || heady[1]<=0)
    {
      fill(255);
      rect(125,125,160,100);
      fill(0);
      text("GAME OVER",200,150);
      text("Score:  "+str(snakesize-1)+" apples eaten",200,175);
      text("Press SHIFT to RESTART",200,200);
      stopgame=true;
    }
  }
}
void restart()        //if we press shift then the game is restarted. SHIFT is the key to restart the game. You can change it as well to any other key.
{
  background(255);
  headx[1]=200;
  heady[1]=200;
  for(int i=2;i<1000;i++)
  {
    headx[i]=0;
    heady[i]=0;
  }
  stopgame=false;
  applex=(round(random(47))+1)*8;
  appley=(round(random(47))+1)*8;
  snakesize=10;
  time=0;
  angle=0;
  redo=true;
}
1 Like
2

Right now you have the keys bound to swapping the snake’s angle. Based on that angle, the sketch automatically moves the snake forward in your function called void travel(). If you don’t want this automatic behaviour at all, you could merge these two together (replace the angle inside the key bindings with the location replacements in the travel function).

A quick fix, if you merely want to ‘freeze’ the snake for testing purposes, is by adding a boolean. When it’s false the snake won’t move, if you set it to true the snake automatically moves.

Were these the type of suggestions you were looking for?

1 Like
3

Well, this pauses the game pressing ‘a’, if is what you want… not sure :sweat_smile:

boolean redo=true, stop = false;
.
.
.

in draw:

void draw()
{
  if (stopgame)          
  {
  }
  
  else
  {
     time+=1;
  if(stop)
     time = 1;

// or just:
  
  //if ((time % 5)==0 && !stop)
  //{
  //  travel();
  //  display();
  //  checkdead();              
  //}
...

in keyPressed:

  if (key=='a'){
    if(stop)
     stop = false;
    else
     stop = true;
   }
1 Like