File content as of revision 16:7b474f873683:

#include "Snake.h"

Snake::Snake()
{

}

Snake::~Snake()
{

}

//The Snake Sprite.
int snake_sprite[3][3] = {
    {0,1,0},
    {1,0,1},
    {0,1,0},
};
    
int m = 0; //Variable used to allow a starting location for the player.
    

void Snake::init()
{

    _speed = 0.15;// change this according to the options selected
    
}


void Snake::draw(Gamepad &pad, N5110 &lcd, int length)
{   
    if(m == 0){
        _x = WIDTH/2;  //Spawns player sprite near the middle of the screen.
        _xa = _x;
        _xb = _xa;
        _xc = _xb;
        _xd = _xc;
        _xe = _xd;
        _xf = _xe;
        _xg = _xf;
        _xh = _xg;
        _xi = _xh;
        _xj = _xi;
        _xk = _xj;
        _xl = _xk;
        _xm = _xl;
        _xn = _xm;
        _y = HEIGHT - 3;
        _ya = _y-3; 
        _yb = _y-6; 
        _yc = _y-9; 
        _yd = _y-12; 
        _ye = _y-15; 
        _yf = _y-18; 
        _yg = _y-21; 
        _yh = _y-24; 
        _yi = _y-27; 
        _yj = _y-30; 
        _yk = _y-33; 
        _yl = _y-36; 
        _ym = _y-39; 
        _yn = _y-42; 
        m = m+1;  
        }
    //printf("SPRITE %d %d \n", _x, _y); 
    if(length == 0)  {
        while ((pad.check_event(Gamepad::BACK_PRESSED) == false)) {
            lcd.clear();
            lcd.printString("Game",33,1);
            lcd.printString("Over",33,3);
            lcd.printString("Press Back",14,5); //Function used to promt the user to Restart.
            lcd.refresh();
            wait(0.1);
       }
        NVIC_SystemReset(); //Software Reset. //change this condition to loosing screen.
    }
    else if(length == 1)  {
    lcd.drawSprite(_x,_y,3,3,(int *)snake_sprite); //Function used to draw the sprite.
    }
    else if(length == 2)  {
    lcd.drawSprite(_x,_y,3,3,(int *)snake_sprite); //Function used to draw the sprite.
    lcd.drawSprite(_xa,_ya,3,3,(int *)snake_sprite);
    }
    else if(length == 3)  {
    lcd.drawSprite(_x,_y,3,3,(int *)snake_sprite); //Function used to draw the sprite.
    lcd.drawSprite(_xa,_ya,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xb,_yb,3,3,(int *)snake_sprite);
    }
    else if(length == 4)  {
    lcd.drawSprite(_x,_y,3,3,(int *)snake_sprite); //Function used to draw the sprite.
    lcd.drawSprite(_xa,_ya,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xb,_yb,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xc,_yc,3,3,(int *)snake_sprite);
    }
    else if(length == 5)  {
    lcd.drawSprite(_x,_y,3,3,(int *)snake_sprite); //Function used to draw the sprite.
    lcd.drawSprite(_xa,_ya,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xb,_yb,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xc,_yc,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xd,_yd,3,3,(int *)snake_sprite);
    }
    else if(length == 6)  {
    lcd.drawSprite(_x,_y,3,3,(int *)snake_sprite); //Function used to draw the sprite.
    lcd.drawSprite(_xa,_ya,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xb,_yb,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xc,_yc,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xd,_yd,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xe,_ye,3,3,(int *)snake_sprite);
    }
    else if(length == 7)  {
    lcd.drawSprite(_x,_y,3,3,(int *)snake_sprite); //Function used to draw the sprite.
    lcd.drawSprite(_xa,_ya,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xb,_yb,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xc,_yc,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xd,_yd,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xe,_ye,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xf,_yf,3,3,(int *)snake_sprite);
    }
    else if(length == 8)  {
    lcd.drawSprite(_x,_y,3,3,(int *)snake_sprite); //Function used to draw the sprite.
    lcd.drawSprite(_xa,_ya,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xb,_yb,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xc,_yc,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xd,_yd,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xe,_ye,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xf,_yf,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xg,_yg,3,3,(int *)snake_sprite);
    }
    else if(length == 9)  {
    lcd.drawSprite(_x,_y,3,3,(int *)snake_sprite); //Function used to draw the sprite.
    lcd.drawSprite(_xa,_ya,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xb,_yb,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xc,_yc,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xd,_yd,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xe,_ye,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xf,_yf,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xg,_yg,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xh,_yh,3,3,(int *)snake_sprite);
    }
    else if(length == 10)  {
    lcd.drawSprite(_x,_y,3,3,(int *)snake_sprite); //Function used to draw the sprite.
    lcd.drawSprite(_xa,_ya,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xb,_yb,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xc,_yc,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xd,_yd,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xe,_ye,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xf,_yf,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xg,_yg,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xh,_yh,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xi,_yi,3,3,(int *)snake_sprite);
    }
    else if(length == 11)  {
    lcd.drawSprite(_x,_y,3,3,(int *)snake_sprite); //Function used to draw the sprite.
    lcd.drawSprite(_xa,_ya,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xb,_yb,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xc,_yc,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xd,_yd,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xe,_ye,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xf,_yf,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xg,_yg,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xh,_yh,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xi,_yi,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xj,_yj,3,3,(int *)snake_sprite);
    }
    else if(length == 12)  {
    lcd.drawSprite(_x,_y,3,3,(int *)snake_sprite); //Function used to draw the sprite.
    lcd.drawSprite(_xa,_ya,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xb,_yb,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xc,_yc,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xd,_yd,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xe,_ye,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xf,_yf,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xg,_yg,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xh,_yh,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xi,_yi,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xj,_yj,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xk,_yk,3,3,(int *)snake_sprite);
    }
    else if(length == 13)  {
    lcd.drawSprite(_x,_y,3,3,(int *)snake_sprite); //Function used to draw the sprite.
    lcd.drawSprite(_xa,_ya,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xb,_yb,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xc,_yc,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xd,_yd,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xe,_ye,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xf,_yf,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xg,_yg,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xh,_yh,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xi,_yi,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xj,_yj,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xk,_yk,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xl,_yl,3,3,(int *)snake_sprite);
    }
    else if(length == 14)  {
    lcd.drawSprite(_x,_y,3,3,(int *)snake_sprite); //Function used to draw the sprite.
    lcd.drawSprite(_xa,_ya,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xb,_yb,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xc,_yc,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xd,_yd,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xe,_ye,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xf,_yf,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xg,_yg,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xh,_yh,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xi,_yi,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xj,_yj,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xk,_yk,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xl,_yl,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xm,_ym,3,3,(int *)snake_sprite);
    }
    else if(length == 15)  {
    lcd.drawSprite(_x,_y,3,3,(int *)snake_sprite); //Function used to draw the sprite.
    lcd.drawSprite(_xa,_ya,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xb,_yb,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xc,_yc,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xd,_yd,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xe,_ye,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xf,_yf,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xg,_yg,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xh,_yh,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xi,_yi,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xj,_yj,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xk,_yk,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xl,_yl,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xm,_ym,3,3,(int *)snake_sprite);
    lcd.drawSprite(_xn,_yn,3,3,(int *)snake_sprite);
    }
}



Vector2D Snake::get_pos(int length)
{
    if(length == 1)  {
        Vector2D snakepos = {_x,_y}; //Obtains the snake position.
        return snakepos;
    }
    else if(length == 2)  {
        Vector2D snakepos = {_xa,_ya}; //Obtains the snake position.
        return snakepos;
    }
    else if(length==3)  {
        Vector2D snakepos = {_xb,_yb}; //Obtains the snake position.
        return snakepos;
    }
    else if(length==4)  {
        Vector2D snakepos = {_xc,_yc}; //Obtains the snake position.
        return snakepos;
    }
    else if(length==5)  {
        Vector2D snakepos = {_xd,_yd}; //Obtains the snake position.
        return snakepos;
    }
    else if(length==6)  {
        Vector2D snakepos = {_xe,_ye}; //Obtains the snake position.
        return snakepos;
    }
    else if(length==7)  {
        Vector2D snakepos = {_xf,_yf}; //Obtains the snake position.
        return snakepos;
    }
    else if(length==8)  {
        Vector2D snakepos = {_xg,_yg}; //Obtains the snake position.
        return snakepos;
    }
    else if(length==9)  {
        Vector2D snakepos = {_xh,_yh}; //Obtains the snake position.
        return snakepos;
    }
    else if(length==10)  {
        Vector2D snakepos = {_xi,_yi}; //Obtains the snake position.
        return snakepos;
    }
    else if(length==11)  {
        Vector2D snakepos = {_xj,_yj}; //Obtains the snake position.
        return snakepos;
    }
    else if(length==12)  {
        Vector2D snakepos = {_xk,_yk}; //Obtains the snake position.
        return snakepos;
    }
    else if(length==13)  {
        Vector2D snakepos = {_xl,_yl}; //Obtains the snake position.
        return snakepos;
    }
    else if(length == 14)  {
        Vector2D snakepos = {_xm,_ym}; //Obtains the snake position.
        return snakepos;
    }
    else if(length==15)  {
        Vector2D snakepos = {_xn,_yn}; //Obtains the snake position.
        return snakepos;
    }
    //printf("snakepos from player = %f %f \n", snakepos.x, snakepos.y);
    else  {
        Vector2D snakepos = {-20,-20}; //Obtains the snake position.
        return snakepos;
    }
}

Vector2D Snake::get_pos_before1(int length)  //this sends data of following sprites.
{
    if(length == 1)  {
        Vector2D snakepos_b1 = {-20,-20}; //Obtains the snake position.
        return snakepos_b1;
    }
    else if(length == 2)  {
        Vector2D snakepos_b1 = {_x,_y}; //Obtains the snake position.
        return snakepos_b1;
    }
    else if(length==3)  {
        Vector2D snakepos_b1 = {_xa,_ya}; //Obtains the snake position.
        return snakepos_b1;
    }
    else if(length==4)  {
        Vector2D snakepos_b1 = {_xb,_yb}; //Obtains the snake position.
        return snakepos_b1;
    }
    else if(length==5)  {
        Vector2D snakepos_b1 = {_xc,_yc}; //Obtains the snake position.
        return snakepos_b1;
    }
    else if(length==6)  {
        Vector2D snakepos_b1 = {_xd,_yd}; //Obtains the snake position.
        return snakepos_b1;
    }
    else if(length==7)  {
        Vector2D snakepos_b1 = {_xe,_ye}; //Obtains the snake position.
        return snakepos_b1;
    }
    else if(length==8)  {
        Vector2D snakepos_b1 = {_xf,_yf}; //Obtains the snake position.
        return snakepos_b1;
    }
    else if(length==9)  {
        Vector2D snakepos_b1 = {_xg,_yg}; //Obtains the snake position.
        return snakepos_b1;
    }
    else if(length==10)  {
        Vector2D snakepos_b1 = {_xh,_yh}; //Obtains the snake position.
        return snakepos_b1;
    }
    else if(length==11)  {
        Vector2D snakepos_b1 = {_xi,_yi}; //Obtains the snake position.
        return snakepos_b1;
    }
    else if(length==12)  {
        Vector2D snakepos_b1 = {_xj,_yj}; //Obtains the snake position.
        return snakepos_b1;
    }
    else if(length==13)  {
        Vector2D snakepos_b1 = {_xk,_yk}; //Obtains the snake position.
        return snakepos_b1;
    }
    else if(length == 14)  {
        Vector2D snakepos_b1 = {_xl,_yl}; //Obtains the snake position.
        return snakepos_b1;
    }
    else if(length==15)  {
        Vector2D snakepos_b1 = {_xm,_ym}; //Obtains the snake position.
        return snakepos_b1;
    }
    //printf("snakepos from player = %f %f \n", snakepos.x, snakepos.y);
    else  {
        Vector2D snakepos_b1 = {-20,-20}; //Obtains the snake position.
        return snakepos_b1;
    }
}

Vector2D Snake::get_pos_before2(int length)  //this sends data of following sprites.
{
    if(length == 1)  {
        Vector2D snakepos_b2 = {-20,-20}; //Obtains the snake position.
        return snakepos_b2;
    }
    else if(length == 2)  {
        Vector2D snakepos_b2 = {-20,-20}; //Obtains the snake position.
        return snakepos_b2;
    }
    else if(length == 3)  {
        Vector2D snakepos_b2 = {_x,_y}; //Obtains the snake position.
        return snakepos_b2;
    }
    else if(length==4)  {
        Vector2D snakepos_b2 = {_xa,_ya}; //Obtains the snake position.
        return snakepos_b2;
    }
    else if(length==5)  {
        Vector2D snakepos_b2 = {_xb,_yb}; //Obtains the snake position.
        return snakepos_b2;
    }
    else if(length==6)  {
        Vector2D snakepos_b2 = {_xc,_yc}; //Obtains the snake position.
        return snakepos_b2;
    }
    else if(length==7)  {
        Vector2D snakepos_b2 = {_xd,_yd}; //Obtains the snake position.
        return snakepos_b2;
    }
    else if(length==8)  {
        Vector2D snakepos_b2 = {_xe,_ye}; //Obtains the snake position.
        return snakepos_b2;
    }
    else if(length==9)  {
        Vector2D snakepos_b2 = {_xf,_yf}; //Obtains the snake position.
        return snakepos_b2;
    }
    else if(length==10)  {
        Vector2D snakepos_b2 = {_xg,_yg}; //Obtains the snake position.
        return snakepos_b2;
    }
    else if(length==11)  {
        Vector2D snakepos_b2 = {_xh,_yh}; //Obtains the snake position.
        return snakepos_b2;
    }
    else if(length==12)  {
        Vector2D snakepos_b2 = {_xi,_yi}; //Obtains the snake position.
        return snakepos_b2;
    }
    else if(length==13)  {
        Vector2D snakepos_b2 = {_xj,_yj}; //Obtains the snake position.
        return snakepos_b2;
    }
    else if(length==14)  {
        Vector2D snakepos_b2 = {_xk,_yk}; //Obtains the snake position.
        return snakepos_b2;
    }
    else if(length == 15)  {
        Vector2D snakepos_b2 = {_xl,_yl}; //Obtains the snake position.
        return snakepos_b2;
    }
    //printf("snakepos from player = %f %f \n", snakepos.x, snakepos.y);
    else  {
        Vector2D snakepos_b2 = {-20,-20}; //Obtains the snake position.
        return snakepos_b2;
    }
}

Vector2D Snake::get_pos_before3(int length)  //this sends data of following sprites.
{
    if(length == 1)  {
        Vector2D snakepos_b3 = {-20,-20}; //Obtains the snake position.
        return snakepos_b3;
    }
    else if(length == 2)  {
        Vector2D snakepos_b3 = {-20,-20}; //Obtains the snake position.
        return snakepos_b3;
    }
    else if(length == 3)  {
        Vector2D snakepos_b3 = {-20,-20}; //Obtains the snake position.
        return snakepos_b3;
    }
    else if(length == 4)  {
        Vector2D snakepos_b3 = {_x,_y}; //Obtains the snake position.
        return snakepos_b3;
    }
    else if(length==5)  {
        Vector2D snakepos_b3 = {_xa,_ya}; //Obtains the snake position.
        return snakepos_b3;
    }
    else if(length==6)  {
        Vector2D snakepos_b3 = {_xb,_yb}; //Obtains the snake position.
        return snakepos_b3;
    }
    else if(length==7)  {
        Vector2D snakepos_b3 = {_xc,_yc}; //Obtains the snake position.
        return snakepos_b3;
    }
    else if(length==8)  {
        Vector2D snakepos_b3 = {_xd,_yd}; //Obtains the snake position.
        return snakepos_b3;
    }
    else if(length==9)  {
        Vector2D snakepos_b3 = {_xe,_ye}; //Obtains the snake position.
        return snakepos_b3;
    }
    else if(length==10)  {
        Vector2D snakepos_b3 = {_xf,_yf}; //Obtains the snake position.
        return snakepos_b3;
    }
    else if(length==11)  {
        Vector2D snakepos_b3 = {_xg,_yg}; //Obtains the snake position.
        return snakepos_b3;
    }
    else if(length==12)  {
        Vector2D snakepos_b3 = {_xh,_yh}; //Obtains the snake position.
        return snakepos_b3;
    }
    else if(length==13)  {
        Vector2D snakepos_b3 = {_xi,_yi}; //Obtains the snake position.
        return snakepos_b3;
    }
    else if(length==14)  {
        Vector2D snakepos_b3 = {_xj,_yj}; //Obtains the snake position.
        return snakepos_b3;
    }
    else if(length==15)  {
        Vector2D snakepos_b3 = {_xk,_yk}; //Obtains the snake position.
        return snakepos_b3;
    }
    //printf("snakepos from player = %f %f \n", snakepos.x, snakepos.y);
    else  {
        Vector2D snakepos_b3 = {-20,-20}; //Obtains the snake position.
        return snakepos_b3;
    }
}

Vector2D Snake::get_pos_before4(int length)  //this sends data of following sprites.
{
    if(length == 1)  {
        Vector2D snakepos_b4 = {-20,-20}; //Obtains the snake position.
        return snakepos_b4;
    }
    else if(length == 2)  {
        Vector2D snakepos_b4 = {-20,-20}; //Obtains the snake position.
        return snakepos_b4;
    }
    else if(length == 3)  {
        Vector2D snakepos_b4 = {-20,-20}; //Obtains the snake position.
        return snakepos_b4;
    }
    else if(length == 4)  {
        Vector2D snakepos_b4 = {-20,-20}; //Obtains the snake position.
        return snakepos_b4;
    }
    else if(length == 5)  {
        Vector2D snakepos_b4 = {_x,_y}; //Obtains the snake position.
        return snakepos_b4;
    }
    else if(length==6)  {
        Vector2D snakepos_b4 = {_xa,_ya}; //Obtains the snake position.
        return snakepos_b4;
    }
    else if(length==7)  {
        Vector2D snakepos_b4 = {_xb,_yb}; //Obtains the snake position.
        return snakepos_b4;
    }
    else if(length==8)  {
        Vector2D snakepos_b4 = {_xc,_yc}; //Obtains the snake position.
        return snakepos_b4;
    }
    else if(length==9)  {
        Vector2D snakepos_b4 = {_xd,_yd}; //Obtains the snake position.
        return snakepos_b4;
    }
    else if(length==10)  {
        Vector2D snakepos_b4 = {_xe,_ye}; //Obtains the snake position.
        return snakepos_b4;
    }
    else if(length==11)  {
        Vector2D snakepos_b4 = {_xf,_yf}; //Obtains the snake position.
        return snakepos_b4;
    }
    else if(length==12)  {
        Vector2D snakepos_b4 = {_xg,_yg}; //Obtains the snake position.
        return snakepos_b4;
    }
    else if(length==13)  {
        Vector2D snakepos_b4 = {_xh,_yh}; //Obtains the snake position.
        return snakepos_b4;
    }
    else if(length==14)  {
        Vector2D snakepos_b4 = {_xi,_yi}; //Obtains the snake position.
        return snakepos_b4;
    }
    else if(length==15)  {
        Vector2D snakepos_b4 = {_xj,_yj}; //Obtains the snake position.
        return snakepos_b4;
    }
    //printf("snakepos from player = %f %f \n", snakepos.x, snakepos.y);
    else  {
        Vector2D snakepos_b4 = {-20,-20}; //Obtains the snake position.
        return snakepos_b4;
    }
}

Vector2D Snake::get_pos_before5(int length)  //this sends data of following sprites.
{
    if(length == 1)  {
        Vector2D snakepos_b5 = {-20,-20}; //Obtains the snake position.
        return snakepos_b5;
    }
    else if(length == 2)  {
        Vector2D snakepos_b5 = {-20,-20}; //Obtains the snake position.
        return snakepos_b5;
    }
    else if(length == 3)  {
        Vector2D snakepos_b5 = {-20,-20}; //Obtains the snake position.
        return snakepos_b5;
    }
    else if(length == 4)  {
        Vector2D snakepos_b5 = {-20,-20}; //Obtains the snake position.
        return snakepos_b5;
    }
    else if(length == 5)  {
        Vector2D snakepos_b5 = {-20,-20}; //Obtains the snake position.
        return snakepos_b5;
    }
    else if(length == 6)  {
        Vector2D snakepos_b5 = {_x,_y}; //Obtains the snake position.
        return snakepos_b5;
    }
    else if(length==7)  {
        Vector2D snakepos_b5 = {_xa,_ya}; //Obtains the snake position.
        return snakepos_b5;
    }
    else if(length==8)  {
        Vector2D snakepos_b5 = {_xb,_yb}; //Obtains the snake position.
        return snakepos_b5;
    }
    else if(length==9)  {
        Vector2D snakepos_b5 = {_xc,_yc}; //Obtains the snake position.
        return snakepos_b5;
    }
    else if(length==10)  {
        Vector2D snakepos_b5 = {_xd,_yd}; //Obtains the snake position.
        return snakepos_b5;
    }
    else if(length==11)  {
        Vector2D snakepos_b5 = {_xe,_ye}; //Obtains the snake position.
        return snakepos_b5;
    }
    else if(length==12)  {
        Vector2D snakepos_b5 = {_xf,_yf}; //Obtains the snake position.
        return snakepos_b5;
    }
    else if(length==13)  {
        Vector2D snakepos_b5 = {_xg,_yg}; //Obtains the snake position.
        return snakepos_b5;
    }
    else if(length==14)  {
        Vector2D snakepos_b5 = {_xh,_yh}; //Obtains the snake position.
        return snakepos_b5;
    }
    else if(length==15)  {
        Vector2D snakepos_b5 = {_xi,_yi}; //Obtains the snake position.
        return snakepos_b5;
    }
    //printf("snakepos from player = %f %f \n", snakepos.x, snakepos.y);
    else  {
        Vector2D snakepos_b5 = {-20,-20}; //Obtains the snake position.
        return snakepos_b5;
    }
}

Vector2D Snake::get_pos_before6(int length)  //this sends data of following sprites.
{
    if(length == 1)  {
        Vector2D snakepos_b6 = {-20,-20}; //Obtains the snake position.
        return snakepos_b6;
    }
    else if(length == 2)  {
        Vector2D snakepos_b6 = {-20,-20}; //Obtains the snake position.
        return snakepos_b6;
    }
    else if(length == 3)  {
        Vector2D snakepos_b6 = {-20,-20}; //Obtains the snake position.
        return snakepos_b6;
    }
    else if(length == 4)  {
        Vector2D snakepos_b6 = {-20,-20}; //Obtains the snake position.
        return snakepos_b6;
    }
    else if(length == 5)  {
        Vector2D snakepos_b6 = {-20,-20}; //Obtains the snake position.
        return snakepos_b6;
    }
    else if(length == 6)  {
        Vector2D snakepos_b6 = {-20,-20}; //Obtains the snake position.
        return snakepos_b6;
    }
    else if(length == 7)  {
        Vector2D snakepos_b6 = {_x,_y}; //Obtains the snake position.
        return snakepos_b6;
    }
    else if(length==8)  {
        Vector2D snakepos_b6 = {_xa,_ya}; //Obtains the snake position.
        return snakepos_b6;
    }
    else if(length==9)  {
        Vector2D snakepos_b6 = {_xb,_yb}; //Obtains the snake position.
        return snakepos_b6;
    }
    else if(length==10)  {
        Vector2D snakepos_b6 = {_xc,_yc}; //Obtains the snake position.
        return snakepos_b6;
    }
    else if(length==11)  {
        Vector2D snakepos_b6 = {_xd,_yd}; //Obtains the snake position.
        return snakepos_b6;
    }
    else if(length==12)  {
        Vector2D snakepos_b6 = {_xe,_ye}; //Obtains the snake position.
        return snakepos_b6;
    }
    else if(length==13)  {
        Vector2D snakepos_b6 = {_xf,_yf}; //Obtains the snake position.
        return snakepos_b6;
    }
    else if(length==14)  {
        Vector2D snakepos_b6 = {_xg,_yg}; //Obtains the snake position.
        return snakepos_b6;
    }
    else if(length==15)  {
        Vector2D snakepos_b6 = {_xh,_yh}; //Obtains the snake position.
        return snakepos_b6;
    }
    //printf("snakepos from player = %f %f \n", snakepos.x, snakepos.y);
    else  {
        Vector2D snakepos_b6 = {-20,-20}; //Obtains the snake position.
        return snakepos_b6;
    }
}

Vector2D Snake::get_pos_before7(int length)  //this sends data of following sprites.
{
    if(length == 1)  {
        Vector2D snakepos_b7 = {-20,-20}; //Obtains the snake position.
        return snakepos_b7;
    }
    else if(length == 2)  {
        Vector2D snakepos_b7 = {-20,-20}; //Obtains the snake position.
        return snakepos_b7;
    }
    else if(length == 3)  {
        Vector2D snakepos_b7 = {-20,-20}; //Obtains the snake position.
        return snakepos_b7;
    }
    else if(length == 4)  {
        Vector2D snakepos_b7 = {-20,-20}; //Obtains the snake position.
        return snakepos_b7;
    }
    else if(length == 5)  {
        Vector2D snakepos_b7 = {-20,-20}; //Obtains the snake position.
        return snakepos_b7;
    }
    else if(length == 6)  {
        Vector2D snakepos_b7 = {-20,-20}; //Obtains the snake position.
        return snakepos_b7;
    }
    else if(length == 7)  {
        Vector2D snakepos_b7 = {-20,-20}; //Obtains the snake position.
        return snakepos_b7;
    }
    else if(length == 8)  {
        Vector2D snakepos_b7 = {_x,_y}; //Obtains the snake position.
        return snakepos_b7;
    }
    else if(length==9)  {
        Vector2D snakepos_b7 = {_xa,_ya}; //Obtains the snake position.
        return snakepos_b7;
    }
    else if(length==10)  {
        Vector2D snakepos_b7 = {_xb,_yb}; //Obtains the snake position.
        return snakepos_b7;
    }
    else if(length==11)  {
        Vector2D snakepos_b7 = {_xc,_yc}; //Obtains the snake position.
        return snakepos_b7;
    }
    else if(length==12)  {
        Vector2D snakepos_b7 = {_xd,_yd}; //Obtains the snake position.
        return snakepos_b7;
    }
    else if(length==13)  {
        Vector2D snakepos_b7 = {_xe,_ye}; //Obtains the snake position.
        return snakepos_b7;
    }
    else if(length==14)  {
        Vector2D snakepos_b7 = {_xf,_yf}; //Obtains the snake position.
        return snakepos_b7;
    }
    else if(length==15)  {
        Vector2D snakepos_b7 = {_xg,_yg}; //Obtains the snake position.
        return snakepos_b7;
    }
    //printf("snakepos from player = %f %f \n", snakepos.x, snakepos.y);
    else  {
        Vector2D snakepos_b7 = {-20,-20}; //Obtains the snake position.
        return snakepos_b7;
    }
}

Vector2D Snake::get_pos_before8(int length)  //this sends data of following sprites.
{
    if(length == 1)  {
        Vector2D snakepos_b8 = {-20,-20}; //Obtains the snake position.
        return snakepos_b8;
    }
    else if(length == 2)  {
        Vector2D snakepos_b8 = {-20,-20}; //Obtains the snake position.
        return snakepos_b8;
    }
    else if(length == 3)  {
        Vector2D snakepos_b8 = {-20,-20}; //Obtains the snake position.
        return snakepos_b8;
    }
    else if(length == 4)  {
        Vector2D snakepos_b8 = {-20,-20}; //Obtains the snake position.
        return snakepos_b8;
    }
    else if(length == 5)  {
        Vector2D snakepos_b8 = {-20,-20}; //Obtains the snake position.
        return snakepos_b8;
    }
    else if(length == 6)  {
        Vector2D snakepos_b8 = {-20,-20}; //Obtains the snake position.
        return snakepos_b8;
    }
    else if(length == 7)  {
        Vector2D snakepos_b8 = {-20,-20}; //Obtains the snake position.
        return snakepos_b8;
    }
    else if(length == 8)  {
        Vector2D snakepos_b8 = {-20,-20}; //Obtains the snake position.
        return snakepos_b8;
    }
    else if(length == 9)  {
        Vector2D snakepos_b8 = {_x,_y}; //Obtains the snake position.
        return snakepos_b8;
    }
    else if(length==10)  {
        Vector2D snakepos_b8 = {_xa,_ya}; //Obtains the snake position.
        return snakepos_b8;
    }
    else if(length==11)  {
        Vector2D snakepos_b8 = {_xb,_yb}; //Obtains the snake position.
        return snakepos_b8;
    }
    else if(length==12)  {
        Vector2D snakepos_b8 = {_xc,_yc}; //Obtains the snake position.
        return snakepos_b8;
    }
    else if(length==13)  {
        Vector2D snakepos_b8 = {_xd,_yd}; //Obtains the snake position.
        return snakepos_b8;
    }
    else if(length==14)  {
        Vector2D snakepos_b8 = {_xe,_ye}; //Obtains the snake position.
        return snakepos_b8;
    }
    else if(length==15)  {
        Vector2D snakepos_b8 = {_xf,_yf}; //Obtains the snake position.
        return snakepos_b8;
    }
    //printf("snakepos from player = %f %f \n", snakepos.x, snakepos.y);
    else  {
        Vector2D snakepos_b8 = {-20,-20}; //Obtains the snake position.
        return snakepos_b8;
    }
}

Vector2D Snake::get_pos_before9(int length)  //this sends data of following sprites.
{
    if(length == 1)  {
        Vector2D snakepos_b9 = {-20,-20}; //Obtains the snake position.
        return snakepos_b9;
    }
    else if(length == 2)  {
        Vector2D snakepos_b9 = {-20,-20}; //Obtains the snake position.
        return snakepos_b9;
    }
    else if(length == 3)  {
        Vector2D snakepos_b9 = {-20,-20}; //Obtains the snake position.
        return snakepos_b9;
    }
    else if(length == 4)  {
        Vector2D snakepos_b9 = {-20,-20}; //Obtains the snake position.
        return snakepos_b9;
    }
    else if(length == 5)  {
        Vector2D snakepos_b9 = {-20,-20}; //Obtains the snake position.
        return snakepos_b9;
    }
    else if(length == 6)  {
        Vector2D snakepos_b9 = {-20,-20}; //Obtains the snake position.
        return snakepos_b9;
    }
    else if(length == 7)  {
        Vector2D snakepos_b9 = {-20,-20}; //Obtains the snake position.
        return snakepos_b9;
    }
    else if(length == 8)  {
        Vector2D snakepos_b9 = {-20,-20}; //Obtains the snake position.
        return snakepos_b9;
    }
    else if(length == 9)  {
        Vector2D snakepos_b9 = {-20,-20}; //Obtains the snake position.
        return snakepos_b9;
    }
    else if(length == 10)  {
        Vector2D snakepos_b9 = {_x,_y}; //Obtains the snake position.
        return snakepos_b9;
    }
    else if(length==11)  {
        Vector2D snakepos_b9 = {_xa,_ya}; //Obtains the snake position.
        return snakepos_b9;
    }
    else if(length==12)  {
        Vector2D snakepos_b9 = {_xb,_yb}; //Obtains the snake position.
        return snakepos_b9;
    }
    else if(length==13)  {
        Vector2D snakepos_b9 = {_xc,_yc}; //Obtains the snake position.
        return snakepos_b9;
    }
    else if(length==14)  {
        Vector2D snakepos_b9 = {_xd,_yd}; //Obtains the snake position.
        return snakepos_b9;
    }
    else if(length==15)  {
        Vector2D snakepos_b9 = {_xe,_ye}; //Obtains the snake position.
        return snakepos_b9;
    }
    //printf("snakepos from player = %f %f \n", snakepos.x, snakepos.y);
    else  {
        Vector2D snakepos_b9 = {-20,-20}; //Obtains the snake position.
        return snakepos_b9;
    }
}

Vector2D Snake::get_pos_before10(int length)  //this sends data of following sprites.
{
    if(length == 1)  {
        Vector2D snakepos_b10 = {-20,-20}; //Obtains the snake position.
        return snakepos_b10;
    }
    else if(length == 2)  {
        Vector2D snakepos_b10 = {-20,-20}; //Obtains the snake position.
        return snakepos_b10;
    }
    else if(length == 3)  {
        Vector2D snakepos_b10 = {-20,-20}; //Obtains the snake position.
        return snakepos_b10;
    }
    else if(length == 4)  {
        Vector2D snakepos_b10 = {-20,-20}; //Obtains the snake position.
        return snakepos_b10;
    }
    else if(length == 5)  {
        Vector2D snakepos_b10 = {-20,-20}; //Obtains the snake position.
        return snakepos_b10;
    }
    else if(length == 6)  {
        Vector2D snakepos_b10 = {-20,-20}; //Obtains the snake position.
        return snakepos_b10;
    }
    else if(length == 7)  {
        Vector2D snakepos_b10 = {-20,-20}; //Obtains the snake position.
        return snakepos_b10;
    }
    else if(length == 8)  {
        Vector2D snakepos_b10 = {-20,-20}; //Obtains the snake position.
        return snakepos_b10;
    }
    else if(length == 9)  {
            Vector2D snakepos_b10 = {-20,-20}; //Obtains the snake position.
        return snakepos_b10;
    }
    else if(length == 10)  {
        Vector2D snakepos_b10 = {-20,-20}; //Obtains the snake position.
        return snakepos_b10;
    }
    else if(length == 11)  {
        Vector2D snakepos_b10 = {_x,_y}; //Obtains the snake position.
        return snakepos_b10;
    }
    else if(length==12)  {
        Vector2D snakepos_b10 = {_xa,_ya}; //Obtains the snake position.
        return snakepos_b10;
    }
    else if(length==13)  {
        Vector2D snakepos_b10 = {_xb,_yb}; //Obtains the snake position.
        return snakepos_b10;
    }
    else if(length==14)  {
        Vector2D snakepos_b10 = {_xc,_yc}; //Obtains the snake position.
        return snakepos_b10;
    }
    else if(length==15)  {
        Vector2D snakepos_b10 = {_xd,_yd}; //Obtains the snake position.
        return snakepos_b10;
    }
    //printf("snakepos from player = %f %f \n", snakepos.x, snakepos.y);
    else  {
        Vector2D snakepos_b10 = {-20,-20}; //Obtains the snake position.
        return snakepos_b10;
    }
}

Vector2D Snake::get_pos_before11(int length)  //this sends data of following sprites.
{
    if(length == 1)  {
        Vector2D snakepos_b11 = {-20,-20}; //Obtains the snake position.
        return snakepos_b11;
    }
    else if(length == 2)  {
        Vector2D snakepos_b11 = {-20,-20}; //Obtains the snake position.
        return snakepos_b11;
    }
    else if(length == 3)  {
        Vector2D snakepos_b11 = {-20,-20}; //Obtains the snake position.
        return snakepos_b11;
    }
    else if(length == 4)  {
        Vector2D snakepos_b11 = {-20,-20}; //Obtains the snake position.
        return snakepos_b11;
    }
    else if(length == 5)  {
        Vector2D snakepos_b11 = {-20,-20}; //Obtains the snake position.
        return snakepos_b11;
    }
    else if(length == 6)  {
        Vector2D snakepos_b11 = {-20,-20}; //Obtains the snake position.
        return snakepos_b11;
    }
    else if(length == 7)  {
        Vector2D snakepos_b11 = {-20,-20}; //Obtains the snake position.
        return snakepos_b11;
    }
    else if(length == 8)  {
        Vector2D snakepos_b11 = {-20,-20}; //Obtains the snake position.
        return snakepos_b11;
    }
    else if(length == 9)  {
        Vector2D snakepos_b11 = {-20,-20}; //Obtains the snake position.
        return snakepos_b11;
    }
    else if(length == 10)  {
            Vector2D snakepos_b11 = {-20,-20}; //Obtains the snake position.
        return snakepos_b11;
    }
    else if(length == 11)  {
        Vector2D snakepos_b11 = {-20,-20}; //Obtains the snake position.
        return snakepos_b11;
    }
    else if(length == 12)  {
        Vector2D snakepos_b11 = {_x,_y}; //Obtains the snake position.
        return snakepos_b11;
    }
    else if(length==13)  {
        Vector2D snakepos_b11 = {_xa,_ya}; //Obtains the snake position.
        return snakepos_b11;
    }
    else if(length==14)  {
        Vector2D snakepos_b11 = {_xb,_yb}; //Obtains the snake position.
        return snakepos_b11;
    }
    else if(length==15)  {
        Vector2D snakepos_b11 = {_xc,_yc}; //Obtains the snake position.
        return snakepos_b11;
    }
    //printf("snakepos from player = %f %f \n", snakepos.x, snakepos.y);
    else  {
        Vector2D snakepos_b11 = {-20,-20}; //Obtains the snake position.
        return snakepos_b11;
    }
}

Vector2D Snake::get_pos_before12(int length)  //this sends data of following sprites.
{
    if(length == 1)  {
        Vector2D snakepos_b12 = {-20,-20}; //Obtains the snake position.
        return snakepos_b12;
    }
    else if(length == 2)  {
        Vector2D snakepos_b12 = {-20,-20}; //Obtains the snake position.
        return snakepos_b12;
    }
    else if(length == 3)  {
        Vector2D snakepos_b12 = {-20,-20}; //Obtains the snake position.
        return snakepos_b12;
    }
    else if(length == 4)  {
        Vector2D snakepos_b12 = {-20,-20}; //Obtains the snake position.
        return snakepos_b12;
    }
    else if(length == 5)  {
        Vector2D snakepos_b12 = {-20,-20}; //Obtains the snake position.
        return snakepos_b12;
    }
    else if(length == 6)  {
        Vector2D snakepos_b12 = {-20,-20}; //Obtains the snake position.
        return snakepos_b12;
    }
    else if(length == 7)  {
        Vector2D snakepos_b12 = {-20,-20}; //Obtains the snake position.
        return snakepos_b12;
    }
    else if(length == 8)  {
        Vector2D snakepos_b12 = {-20,-20}; //Obtains the snake position.
        return snakepos_b12;
    }
    else if(length == 9)  {
        Vector2D snakepos_b12 = {-20,-20}; //Obtains the snake position.
        return snakepos_b12;
    }
    else if(length == 10)  {
        Vector2D snakepos_b12 = {-20,-20}; //Obtains the snake position.
        return snakepos_b12;
    }
    else if(length == 11)  {
            Vector2D snakepos_b12 = {-20,-20}; //Obtains the snake position.
        return snakepos_b12;
    }
    else if(length == 12)  {
        Vector2D snakepos_b12 = {-20,-20}; //Obtains the snake position.
        return snakepos_b12;
    }
    else if(length == 13)  {
        Vector2D snakepos_b12 = {_x,_y}; //Obtains the snake position.
        return snakepos_b12;
    }
    else if(length==14)  {
        Vector2D snakepos_b12 = {_xa,_ya}; //Obtains the snake position.
        return snakepos_b12;
    }
    else if(length==15)  {
        Vector2D snakepos_b12 = {_xb,_yb}; //Obtains the snake position.
        return snakepos_b12;
    }
    //printf("snakepos from player = %f %f \n", snakepos.x, snakepos.y);
    else  {
        Vector2D snakepos_b12 = {-20,-20}; //Obtains the snake position.
        return snakepos_b12;
    }
}

Vector2D Snake::get_pos_before13(int length)  //this sends data of following sprites.
{
    if(length == 1)  {
        Vector2D snakepos_b13 = {-20,-20}; //Obtains the snake position.
        return snakepos_b13;
    }
    else if(length == 2)  {
        Vector2D snakepos_b13 = {-20,-20}; //Obtains the snake position.
        return snakepos_b13;
    }
    else if(length == 3)  {
        Vector2D snakepos_b13 = {-20,-20}; //Obtains the snake position.
        return snakepos_b13;
    }
    else if(length == 4)  {
        Vector2D snakepos_b13 = {-20,-20}; //Obtains the snake position.
        return snakepos_b13;
    }
    else if(length == 5)  {
        Vector2D snakepos_b13 = {-20,-20}; //Obtains the snake position.
        return snakepos_b13;
    }
    else if(length == 6)  {
        Vector2D snakepos_b13 = {-20,-20}; //Obtains the snake position.
        return snakepos_b13;
    }
    else if(length == 7)  {
        Vector2D snakepos_b13 = {-20,-20}; //Obtains the snake position.
        return snakepos_b13;
    }
    else if(length == 8)  {
        Vector2D snakepos_b13 = {-20,-20}; //Obtains the snake position.
        return snakepos_b13;
    }
    else if(length == 9)  {
        Vector2D snakepos_b13 = {-20,-20}; //Obtains the snake position.
        return snakepos_b13;
    }
    else if(length == 10)  {
        Vector2D snakepos_b13 = {-20,-20}; //Obtains the snake position.
        return snakepos_b13;
    }
    else if(length == 11)  {
        Vector2D snakepos_b13 = {-20,-20}; //Obtains the snake position.
        return snakepos_b13;
    }
    else if(length == 12)  {
            Vector2D snakepos_b13 = {-20,-20}; //Obtains the snake position.
        return snakepos_b13;
    }
    else if(length == 13)  {
        Vector2D snakepos_b13 = {-20,-20}; //Obtains the snake position.
        return snakepos_b13;
    }
    else if(length == 14)  {
        Vector2D snakepos_b13 = {_x,_y}; //Obtains the snake position.
        return snakepos_b13;
    }
    else if(length==15)  {
        Vector2D snakepos_b13 = {_xa,_ya}; //Obtains the snake position.
        return snakepos_b13;
    }
    //printf("snakepos from player = %f %f \n", snakepos.x, snakepos.y);
    else  {
        Vector2D snakepos_b13 = {-20,-20}; //Obtains the snake position.
        return snakepos_b13;
    }
}

Vector2D Snake::get_pos_before14(int length)  //this sends data of following sprites.
{
    if(length == 1)  {
        Vector2D snakepos_b14 = {-20,-20}; //Obtains the snake position.
        return snakepos_b14;
    }
    else if(length == 2)  {
        Vector2D snakepos_b14 = {-20,-20}; //Obtains the snake position.
        return snakepos_b14;
    }
    else if(length == 3)  {
        Vector2D snakepos_b14 = {-20,-20}; //Obtains the snake position.
        return snakepos_b14;
    }
    else if(length == 4)  {
        Vector2D snakepos_b14 = {-20,-20}; //Obtains the snake position.
        return snakepos_b14;
    }
    else if(length == 5)  {
        Vector2D snakepos_b14 = {-20,-20}; //Obtains the snake position.
        return snakepos_b14;
    }
    else if(length == 6)  {
        Vector2D snakepos_b14 = {-20,-20}; //Obtains the snake position.
        return snakepos_b14;
    }
    else if(length == 7)  {
        Vector2D snakepos_b14 = {-20,-20}; //Obtains the snake position.
        return snakepos_b14;
    }
    else if(length == 8)  {
        Vector2D snakepos_b14 = {-20,-20}; //Obtains the snake position.
        return snakepos_b14;
    }
    else if(length == 9)  {
        Vector2D snakepos_b14 = {-20,-20}; //Obtains the snake position.
        return snakepos_b14;
    }
    else if(length == 10)  {
        Vector2D snakepos_b14 = {-20,-20}; //Obtains the snake position.
        return snakepos_b14;
    }
    else if(length == 11)  {
        Vector2D snakepos_b14 = {-20,-20}; //Obtains the snake position.
        return snakepos_b14;
    }
    else if(length == 12)  {
            Vector2D snakepos_b14 = {-20,-20}; //Obtains the snake position.
        return snakepos_b14;
    }
    else if(length == 13)  {
        Vector2D snakepos_b14 = {-20,-20}; //Obtains the snake position.
        return snakepos_b14;
    }
    else if(length == 14)  {
        Vector2D snakepos_b14 = {-20,-20}; //Obtains the snake position.
        return snakepos_b14;
    }
    else if(length==15)  {
        Vector2D snakepos_b14 = {_x,_y}; //Obtains the snake position.
        return snakepos_b14;
    }
    //printf("snakepos from player = %f %f \n", snakepos.x, snakepos.y);
    else  {
        Vector2D snakepos_b14 = {-20,-20}; //Obtains the snake position.
        return snakepos_b14;
    }
}

Vector2D Snake::get_pos_before15(int length)  //this sends data of following sprites.
{
    if(length == 1)  {
        Vector2D snakepos_b15 = {-20,-20}; //Obtains the snake position.
        return snakepos_b15;
    }
    else if(length == 2)  {
        Vector2D snakepos_b15 = {-20,-20}; //Obtains the snake position.
        return snakepos_b15;
    }
    else if(length == 3)  {
        Vector2D snakepos_b15 = {-20,-20}; //Obtains the snake position.
        return snakepos_b15;
    }
    else if(length == 4)  {
        Vector2D snakepos_b15 = {-20,-20}; //Obtains the snake position.
        return snakepos_b15;
    }
    else if(length == 5)  {
        Vector2D snakepos_b15 = {-20,-20}; //Obtains the snake position.
        return snakepos_b15;
    }
    else if(length == 6)  {
        Vector2D snakepos_b15 = {-20,-20}; //Obtains the snake position.
        return snakepos_b15;
    }
    else if(length == 7)  {
        Vector2D snakepos_b15 = {-20,-20}; //Obtains the snake position.
        return snakepos_b15;
    }
    else if(length == 8)  {
        Vector2D snakepos_b15 = {-20,-20}; //Obtains the snake position.
        return snakepos_b15;
    }
    else if(length == 9)  {
        Vector2D snakepos_b15 = {-20,-20}; //Obtains the snake position.
        return snakepos_b15;
    }
    else if(length == 10)  {
        Vector2D snakepos_b15 = {-20,-20}; //Obtains the snake position.
        return snakepos_b15;
    }
    else if(length == 11)  {
        Vector2D snakepos_b15 = {-20,-20}; //Obtains the snake position.
        return snakepos_b15;
    }
    else if(length == 12)  {
        Vector2D snakepos_b15 = {-20,-20}; //Obtains the snake position.
        return snakepos_b15;
    }
    else if(length == 13)  {
            Vector2D snakepos_b15 = {-20,-20}; //Obtains the snake position.
        return snakepos_b15;
    }
    else if(length == 14)  {
        Vector2D snakepos_b15 = {-20,-20}; //Obtains the snake position.
        return snakepos_b15;
    }
    else if(length == 15)  {
        Vector2D snakepos_b15 = {-20,-20}; //Obtains the snake position.
        return snakepos_b15;
    }
    //printf("snakepos from player = %f %f \n", snakepos.x, snakepos.y);
    else  {
        Vector2D snakepos_b15 = {-20,-20}; //Obtains the snake position.
        return snakepos_b15;
    }
}

void Snake::update(Direction d,float mag,int length, int speed)
{
    _speed = speed;  //Speed changes depending on how much you push the joystick.(As Of Now)
    
    if(length > 1)  {
        if (_x > _xa)  {
            _x-=_speed;    
        }
        if (_x < _xa)  {
            _x+=_speed;    
        }
        if(length > 2)  {
            if (_xa > _xb)  {
                _xa-=_speed;    
            }
            if (_xa < _xb)  {
                _xa+=_speed;    
            }
            if(length > 3)  {
                if (_xb > _xc)  {
                    _xb-=_speed;    
                }
                if (_xb < _xc)  {
                    _xb+=_speed;    
                }
                if(length > 4)  {
                    if (_xc > _xd)  {
                        _xc-=_speed;    
                    }
                    if (_xc < _xd)  {
                        _xc+=_speed;    
                    }
                    if(length > 5)  {
                        if (_xd > _xe)  {
                            _xd-=_speed;    
                        }
                        if (_xd < _xe)  {
                            _xd+=_speed;    
                        }
                        if(length > 6)  {
                            if (_xe > _xf)  {
                                _xe-=_speed;    
                            }
                            if (_xe < _xf)  {
                                _xe+=_speed;    
                            }
                            if(length > 7)  {
                                if (_xf > _xg)  {
                                    _xf-=_speed;    
                                }
                                if (_xf < _xg)  {
                                    _xf+=_speed;    
                                }
                                if(length > 8)  {
                                    if (_xg > _xh)  {
                                        _xg-=_speed;    
                                    }
                                    if (_xg < _xh)  {
                                        _xg+=_speed;    
                                    }
                                    if(length > 9)  {
                                        if (_xh > _xi)  {
                                            _xh-=_speed;    
                                        }
                                        if (_xh < _xi)  {
                                            _xh+=_speed;    
                                        }
                                        if(length > 10)  {
                                            if (_xi > _xj)  {
                                                _xi-=_speed;    
                                            }
                                            if (_xi < _xj)  {
                                                _xi+=_speed;    
                                            }
                                            if(length > 11)  {
                                                if (_xj > _xk)  {
                                                    _xj-=_speed;    
                                                }
                                                if (_xj < _xk)  {
                                                    _xj+=_speed;    
                                                }
                                                if(length > 12)  {
                                                    if (_xk > _xl)  {
                                                        _xk-=_speed;    
                                                    }
                                                    if (_xk < _xl)  {
                                                        _xk+=_speed;    
                                                    }
                                                    if(length > 13)  {
                                                        if (_xl > _xm)  {
                                                            _xl-=_speed;    
                                                        }
                                                        if (_xl < _xm)  {
                                                            _xl+=_speed;    
                                                        }
                                                        if(length > 14)  {
                                                            if (_xm > _xn)  {
                                                                _xm-=_speed;    
                                                            }
                                                            if (_xm < _xn)  {
                                                                _xm+=_speed;    
                                                            }
                                                        }
                                                    }
                                                }
                                            }
                                        }
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
    }

    // Diagonal speeds are /2 to prevent player from going double the speed.
    if(length == 15)  {
        if (d == E) {
            _xn+= _speed;
        }
        if (d == W) {
            _xn-= _speed;
        }
    }
    if(length == 14)  {
        if (d == E) {
            _xm+= _speed;
        }
        if (d == W) {
            _xm-= _speed;
        }
    }
    if(length == 13)  {
        if (d == E) {
            _xl+= _speed;
        }
        if (d == W) {
            _xl-= _speed;
        }
    }
    if(length == 12)  {
        if (d == E) {
            _xk+= _speed;
        }
        if (d == W) {
            _xk-= _speed;
        }
    }
    if(length == 11)  {
        if (d == E) {
            _xj+= _speed;
        }
        if (d == W) {
            _xj-= _speed;
        }
    }
    if(length == 10)  {
        if (d == E) {
            _xi+= _speed;
        }
        if (d == W) {
            _xi-= _speed;
        }
    }
    if(length == 9)  {
        if (d == E) {
            _xh+= _speed;
        }
        if (d == W) {
            _xh-= _speed;
        }
    }
    if(length == 8)  {
        if (d == E) {
            _xg+= _speed;
        }
        if (d == W) {
            _xg-= _speed;
        }
    }
    if(length == 7)  {
        if (d == E) {
            _xf+= _speed;
        }
        if (d == W) {
            _xf-= _speed;
        }
    }
    if(length == 6)  {
        if (d == E) {
            _xe+= _speed;
        }
        if (d == W) {
            _xe-= _speed;
        }
    }
    if(length == 5)  {
        if (d == E) {
            _xd+= _speed;
        }
        if (d == W) {
            _xd-= _speed;
        }
    }
    if(length == 4)  {
        if (d == E) {
            _xc+= _speed;
        }
        if (d == W) {
            _xc-= _speed;
        }
    }
    if(length == 3)  {
        if (d == E) {
            _xb+= _speed;
        }
        if (d == W) {
            _xb-= _speed;
        }
    }
    if(length == 2)  {
        if (d == E) {
            _xa+= _speed;
        }
        if (d == W) {
            _xa-= _speed;
        }
    }
    if(length == 1)  {
        if (d == E) {
            _x+= _speed;
        }
        if (d == W) {
            _x-= _speed;
        }
    }

// the following makes sure that when the length is increased, the snake stays where it was when it ate food.

    if(length < 2)  {
        _xa = _x;
    }
    else if(length < 3)  {
        _xb = _xa;
    }
    else if(length < 4)  {
        _xc = _xb;
    }
    else if(length < 5)  {
        _xd = _xc;
    }
    else if(length < 6)  {
        _xe = _xd;
    }
    else if(length < 7)  {
        _xf = _xe;
    }
    else if(length < 8)  {
        _xg = _xf;
    }
    else if(length < 9)  {
        _xh = _xg;
    }
    else if(length < 10)  {
        _xi = _xh;
    }
    else if(length < 11)  {
        _xj = _xi;
    }
    else if(length < 12)  {
        _xk = _xj;
    }
    else if(length < 13)  {
        _xl = _xk;
    }
    else if(length < 14)  {
        _xm = _xl;
    }
    else if(length < 15)  {
        _xn = _xm;
    }
    
    //Limits set so that the sprite does not travel off the screen.
    if (_y <= 0) {
        _y = 0;
    }
    if (_x <= 0) {
        _x = 0;
    }
    if (_xa <= 0) {
        _xa = 0;
    }
    if (_xb <= 0) {
        _xb = 0;
    }
    if (_xc <= 0) {
        _xc = 0;
    }
    if (_xd <= 0) {
        _xd = 0;
    }
    if (_xe <= 0) {
        _xe = 0;
    }
    if (_xf <= 0) {
        _xf = 0;
    }
    if (_xg <= 0) {
        _xg = 0;
    }
    if (_xh <= 0) {
        _xh = 0;
    }
    if (_xi <= 0) {
        _xi = 0;
    }
    if (_xj <= 0) {
        _xj = 0;
    }
    if (_xk <= 0) {
        _xk = 0;
    }
    if (_xl <= 0) {
        _xl = 0;
    }
    if (_xm <= 0) {
        _xm = 0;
    }
    if (_xn <= 0) {
        _xn = 0;
    }
    if (_x > 81) {
        _x = 81;
    }
    if (_xa > 81) {
        _xa = 81;
    }
    if (_xb > 81) {
        _xb = 81;
    }
    if (_xc > 81) {
        _xc = 81;
    }
    if (_xd > 81) {
        _xd = 81;
    }
    if (_xe > 81) {
        _xe = 81;
    }
    if (_xf > 81) {
        _xf = 81;
    }
    if (_xg > 81) {
        _xg = 81;
    }
    if (_xh > 81) {
        _xh = 81;
    }
    if (_xi > 81) {
        _xi = 81;
    }
    if (_xj > 81) {
        _xj = 81;
    }
    if (_xk > 81) {
        _xk = 81;
    }
    if (_xl > 81) {
        _xl = 81;
    }
    if (_xm > 81) {
        _xm = 81;
    }
    if (_xn > 81) {
        _xn = 81;
    }
}