File content as of revision 21:e41126528cc6:

#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 = 1;// change this according to the options selected
    
}


int Snake::draw(Gamepad &pad, N5110 &lcd, int length, int level)
{   
    if(m == 0){
        _x[0] = WIDTH/2;  //Spawns player sprite near the middle of the screen.
        _x[1] = _x[0];
        _x[2] = _x[1];
        _x[3] = _x[2];
        _x[4] = _x[3];
        _x[5] = _x[4];
        _x[6] = _x[5];
        _x[7] = _x[6];
        _x[8] = _x[7];
        _x[9] = _x[8];
        _x[10] = _x[9];
        _x[11] = _x[10];
        _x[12] = _x[11];
        _x[13] = _x[12];
        _x[14] = _x[13];
        _y[0] = HEIGHT - 3;
        _y[1] = _y[0] - 3; 
        _y[2] = _y[0] - 6; 
        _y[3] = _y[0] - 9; 
        _y[4] = _y[0] - 12; 
        _y[5] = _y[0] - 15; 
        _y[6] = _y[0] - 18; 
        _y[7] = _y[0] - 21; 
        _y[8] = _y[0] - 24; 
        _y[9] = _y[0] - 27; 
        _y[10] = _y[0] - 30; 
        _y[11] = _y[0] - 33; 
        _y[12] = _y[0] - 36; 
        _y[13] = _y[0] - 39; 
        _y[14] = _y[0] - 42;
        b[0] = 1;
        b[1] = 1;
        b[2] = 1;
        b[3] = 1;
        b[4] = 1;
        b[5] = 1;
        b[6] = 1;
        b[7] = 1;
        b[8] = 1;
        b[9] = 1;
        b[10] = 1;
        b[11] = 1;
        b[12] = 1;
        b[13] = 1;
        b[14] = 1; 
        m = m+1;  
        }
    //printf("SPRITE %d %d \n", _x[0], _y[0]); 
    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[0],_y[0],3,3,(int *)snake_sprite); //Function used to draw the sprite.
    }
    else if(length == 2)  {
    lcd.drawSprite(_x[0],_y[0],3,3,(int *)snake_sprite); //Function used to draw the sprite.
    lcd.drawSprite(_x[1],_y[1],3,3,(int *)snake_sprite);
    }
    else if(length == 3)  {
    lcd.drawSprite(_x[0],_y[0],3,3,(int *)snake_sprite); //Function used to draw the sprite.
    lcd.drawSprite(_x[1],_y[1],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[2],_y[2],3,3,(int *)snake_sprite);
    }
    else if(length == 4)  {
    lcd.drawSprite(_x[0],_y[0],3,3,(int *)snake_sprite); //Function used to draw the sprite.
    lcd.drawSprite(_x[1],_y[1],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[2],_y[2],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[3],_y[3],3,3,(int *)snake_sprite);
    }
    else if(length == 5)  {
    lcd.drawSprite(_x[0],_y[0],3,3,(int *)snake_sprite); //Function used to draw the sprite.
    lcd.drawSprite(_x[1],_y[1],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[2],_y[2],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[3],_y[3],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[4],_y[4],3,3,(int *)snake_sprite);
    }
    else if(length == 6)  {
    lcd.drawSprite(_x[0],_y[0],3,3,(int *)snake_sprite); //Function used to draw the sprite.
    lcd.drawSprite(_x[1],_y[1],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[2],_y[2],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[3],_y[3],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[4],_y[4],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[5],_y[5],3,3,(int *)snake_sprite);
    }
    else if(length == 7)  {
    lcd.drawSprite(_x[0],_y[0],3,3,(int *)snake_sprite); //Function used to draw the sprite.
    lcd.drawSprite(_x[1],_y[1],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[2],_y[2],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[3],_y[3],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[4],_y[4],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[5],_y[5],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[6],_y[6],3,3,(int *)snake_sprite);
    }
    else if(length == 8)  {
    lcd.drawSprite(_x[0],_y[0],3,3,(int *)snake_sprite); //Function used to draw the sprite.
    lcd.drawSprite(_x[1],_y[1],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[2],_y[2],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[3],_y[3],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[4],_y[4],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[5],_y[5],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[6],_y[6],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[7],_y[7],3,3,(int *)snake_sprite);
    }
    else if(length == 9)  {
    lcd.drawSprite(_x[0],_y[0],3,3,(int *)snake_sprite); //Function used to draw the sprite.
    lcd.drawSprite(_x[1],_y[1],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[2],_y[2],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[3],_y[3],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[4],_y[4],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[5],_y[5],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[6],_y[6],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[7],_y[7],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[8],_y[8],3,3,(int *)snake_sprite);
    }
    else if(length == 10)  {
    lcd.drawSprite(_x[0],_y[0],3,3,(int *)snake_sprite); //Function used to draw the sprite.
    lcd.drawSprite(_x[1],_y[1],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[2],_y[2],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[3],_y[3],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[4],_y[4],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[5],_y[5],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[6],_y[6],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[7],_y[7],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[8],_y[8],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[9],_y[9],3,3,(int *)snake_sprite);
    }
    else if(length == 11)  {
    lcd.drawSprite(_x[0],_y[0],3,3,(int *)snake_sprite); //Function used to draw the sprite.
    lcd.drawSprite(_x[1],_y[1],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[2],_y[2],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[3],_y[3],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[4],_y[4],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[5],_y[5],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[6],_y[6],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[7],_y[7],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[8],_y[8],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[9],_y[9],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[10],_y[10],3,3,(int *)snake_sprite);
    }
    else if(length == 12)  {
    lcd.drawSprite(_x[0],_y[0],3,3,(int *)snake_sprite); //Function used to draw the sprite.
    lcd.drawSprite(_x[1],_y[1],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[2],_y[2],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[3],_y[3],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[4],_y[4],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[5],_y[5],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[6],_y[6],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[7],_y[7],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[8],_y[8],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[9],_y[9],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[10],_y[10],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[11],_y[11],3,3,(int *)snake_sprite);
    }
    else if(length == 13)  {
    lcd.drawSprite(_x[0],_y[0],3,3,(int *)snake_sprite); //Function used to draw the sprite.
    lcd.drawSprite(_x[1],_y[1],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[2],_y[2],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[3],_y[3],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[4],_y[4],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[5],_y[5],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[6],_y[6],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[7],_y[7],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[8],_y[8],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[9],_y[9],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[10],_y[10],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[11],_y[11],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[12],_y[12],3,3,(int *)snake_sprite);
    }
    else if(length == 14)  {
    lcd.drawSprite(_x[0],_y[0],3,3,(int *)snake_sprite); //Function used to draw the sprite.
    lcd.drawSprite(_x[1],_y[1],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[2],_y[2],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[3],_y[3],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[4],_y[4],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[5],_y[5],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[6],_y[6],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[7],_y[7],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[8],_y[8],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[9],_y[9],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[10],_y[10],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[11],_y[11],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[12],_y[12],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[13],_y[13],3,3,(int *)snake_sprite);
    }
    else if(length == 15)  {
    lcd.drawSprite(_x[0],_y[0],3,3,(int *)snake_sprite); //Function used to draw the sprite.
    lcd.drawSprite(_x[1],_y[1],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[2],_y[2],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[3],_y[3],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[4],_y[4],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[5],_y[5],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[6],_y[6],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[7],_y[7],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[8],_y[8],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[9],_y[9],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[10],_y[10],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[11],_y[11],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[12],_y[12],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[13],_y[13],3,3,(int *)snake_sprite);
    lcd.drawSprite(_x[14],_y[14],3,3,(int *)snake_sprite);
    }
    else if(length > 15)  {
        lcd.clear();
        lcd.printString("Level Complete",0,1);
        lcd.refresh();
        wait(2);
        lcd.clear();
        lcd.printString("Press Start",10,1);
        lcd.printString("to Proceed",12,3);
        lcd.refresh();
        int sound = 1000; //helps to set max freq for random sound
        while ( pad.check_event(Gamepad::START_PRESSED) == false) {
            pad.leds_on();
            pad.tone(rand()%sound,0.1);
            wait(0.1);
            pad.leds_off();
            wait(0.1);
        }
        lcd.clear();
        char bufferlevel[14];
        sprintf(bufferlevel,"%d",level);
        lcd.printString("Level:",25,1);
        lcd.printString(bufferlevel,40,3);
        lcd.refresh();
        wait(2);
        length = 3;
    }
    return length;
}

Vector2D Snake::get_pos(int length)
{
    if(length == 1)  {
        Vector2D snakepos = {_x[0],_y[0]}; //Obtains the snake position.
        return snakepos;
    }
    else if(length == 2)  {
        Vector2D snakepos = {_x[1],_y[1]}; //Obtains the snake position.
        return snakepos;
    }
    else if(length==3)  {
        Vector2D snakepos = {_x[2],_y[2]}; //Obtains the snake position.
        return snakepos;
    }
    else if(length==4)  {
        Vector2D snakepos = {_x[3],_y[3]}; //Obtains the snake position.
        return snakepos;
    }
    else if(length==5)  {
        Vector2D snakepos = {_x[4],_y[4]}; //Obtains the snake position.
        return snakepos;
    }
    else if(length==6)  {
        Vector2D snakepos = {_x[5],_y[5]}; //Obtains the snake position.
        return snakepos;
    }
    else if(length==7)  {
        Vector2D snakepos = {_x[6],_y[6]}; //Obtains the snake position.
        return snakepos;
    }
    else if(length==8)  {
        Vector2D snakepos = {_x[7],_y[7]}; //Obtains the snake position.
        return snakepos;
    }
    else if(length==9)  {
        Vector2D snakepos = {_x[8],_y[8]}; //Obtains the snake position.
        return snakepos;
    }
    else if(length==10)  {
        Vector2D snakepos = {_x[9],_y[9]}; //Obtains the snake position.
        return snakepos;
    }
    else if(length==11)  {
        Vector2D snakepos = {_x[10],_y[10]}; //Obtains the snake position.
        return snakepos;
    }
    else if(length==12)  {
        Vector2D snakepos = {_x[11],_y[11]}; //Obtains the snake position.
        return snakepos;
    }
    else if(length==13)  {
        Vector2D snakepos = {_x[12],_y[12]}; //Obtains the snake position.
        return snakepos;
    }
    else if(length == 14)  {
        Vector2D snakepos = {_x[13],_y[13]}; //Obtains the snake position.
        return snakepos;
    }
    else if(length==15)  {
        Vector2D snakepos = {_x[14],_y[14]}; //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 == 2)  {
        Vector2D snakepos_b1 = {_x[0],_y[0]}; //Obtains the snake position.
        return snakepos_b1;
    }
    else if(length==3)  {
        Vector2D snakepos_b1 = {_x[1],_y[1]}; //Obtains the snake position.
        return snakepos_b1;
    }
    else if(length==4)  {
        Vector2D snakepos_b1 = {_x[2],_y[2]}; //Obtains the snake position.
        return snakepos_b1;
    }
    else if(length==5)  {
        Vector2D snakepos_b1 = {_x[3],_y[3]}; //Obtains the snake position.
        return snakepos_b1;
    }
    else if(length==6)  {
        Vector2D snakepos_b1 = {_x[4],_y[4]}; //Obtains the snake position.
        return snakepos_b1;
    }
    else if(length==7)  {
        Vector2D snakepos_b1 = {_x[5],_y[5]}; //Obtains the snake position.
        return snakepos_b1;
    }
    else if(length==8)  {
        Vector2D snakepos_b1 = {_x[6],_y[6]}; //Obtains the snake position.
        return snakepos_b1;
    }
    else if(length==9)  {
        Vector2D snakepos_b1 = {_x[7],_y[7]}; //Obtains the snake position.
        return snakepos_b1;
    }
    else if(length==10)  {
        Vector2D snakepos_b1 = {_x[8],_y[8]}; //Obtains the snake position.
        return snakepos_b1;
    }
    else if(length==11)  {
        Vector2D snakepos_b1 = {_x[9],_y[9]}; //Obtains the snake position.
        return snakepos_b1;
    }
    else if(length==12)  {
        Vector2D snakepos_b1 = {_x[10],_y[10]}; //Obtains the snake position.
        return snakepos_b1;
    }
    else if(length==13)  {
        Vector2D snakepos_b1 = {_x[11],_y[11]}; //Obtains the snake position.
        return snakepos_b1;
    }
    else if(length == 14)  {
        Vector2D snakepos_b1 = {_x[12],_y[12]}; //Obtains the snake position.
        return snakepos_b1;
    }
    else if(length==15)  {
        Vector2D snakepos_b1 = {_x[13],_y[13]}; //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 == 3)  {
        Vector2D snakepos_b2 = {_x[0],_y[0]}; //Obtains the snake position.
        return snakepos_b2;
    }
    else if(length==4)  {
        Vector2D snakepos_b2 = {_x[1],_y[1]}; //Obtains the snake position.
        return snakepos_b2;
    }
    else if(length==5)  {
        Vector2D snakepos_b2 = {_x[2],_y[2]}; //Obtains the snake position.
        return snakepos_b2;
    }
    else if(length==6)  {
        Vector2D snakepos_b2 = {_x[3],_y[3]}; //Obtains the snake position.
        return snakepos_b2;
    }
    else if(length==7)  {
        Vector2D snakepos_b2 = {_x[4],_y[4]}; //Obtains the snake position.
        return snakepos_b2;
    }
    else if(length==8)  {
        Vector2D snakepos_b2 = {_x[5],_y[5]}; //Obtains the snake position.
        return snakepos_b2;
    }
    else if(length==9)  {
        Vector2D snakepos_b2 = {_x[6],_y[6]}; //Obtains the snake position.
        return snakepos_b2;
    }
    else if(length==10)  {
        Vector2D snakepos_b2 = {_x[7],_y[7]}; //Obtains the snake position.
        return snakepos_b2;
    }
    else if(length==11)  {
        Vector2D snakepos_b2 = {_x[8],_y[8]}; //Obtains the snake position.
        return snakepos_b2;
    }
    else if(length==12)  {
        Vector2D snakepos_b2 = {_x[9],_y[9]}; //Obtains the snake position.
        return snakepos_b2;
    }
    else if(length==13)  {
        Vector2D snakepos_b2 = {_x[10],_y[10]}; //Obtains the snake position.
        return snakepos_b2;
    }
    else if(length==14)  {
        Vector2D snakepos_b2 = {_x[11],_y[11]}; //Obtains the snake position.
        return snakepos_b2;
    }
    else if(length == 15)  {
        Vector2D snakepos_b2 = {_x[12],_y[12]}; //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 == 4)  {
        Vector2D snakepos_b3 = {_x[0],_y[0]}; //Obtains the snake position.
        return snakepos_b3;
    }
    else if(length==5)  {
        Vector2D snakepos_b3 = {_x[1],_y[1]}; //Obtains the snake position.
        return snakepos_b3;
    }
    else if(length==6)  {
        Vector2D snakepos_b3 = {_x[2],_y[2]}; //Obtains the snake position.
        return snakepos_b3;
    }
    else if(length==7)  {
        Vector2D snakepos_b3 = {_x[3],_y[3]}; //Obtains the snake position.
        return snakepos_b3;
    }
    else if(length==8)  {
        Vector2D snakepos_b3 = {_x[4],_y[4]}; //Obtains the snake position.
        return snakepos_b3;
    }
    else if(length==9)  {
        Vector2D snakepos_b3 = {_x[5],_y[5]}; //Obtains the snake position.
        return snakepos_b3;
    }
    else if(length==10)  {
        Vector2D snakepos_b3 = {_x[6],_y[6]}; //Obtains the snake position.
        return snakepos_b3;
    }
    else if(length==11)  {
        Vector2D snakepos_b3 = {_x[7],_y[7]}; //Obtains the snake position.
        return snakepos_b3;
    }
    else if(length==12)  {
        Vector2D snakepos_b3 = {_x[8],_y[8]}; //Obtains the snake position.
        return snakepos_b3;
    }
    else if(length==13)  {
        Vector2D snakepos_b3 = {_x[9],_y[9]}; //Obtains the snake position.
        return snakepos_b3;
    }
    else if(length==14)  {
        Vector2D snakepos_b3 = {_x[10],_y[10]}; //Obtains the snake position.
        return snakepos_b3;
    }
    else if(length==15)  {
        Vector2D snakepos_b3 = {_x[11],_y[11]}; //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 == 5)  {
        Vector2D snakepos_b4 = {_x[0],_y[0]}; //Obtains the snake position.
        return snakepos_b4;
    }
    else if(length==6)  {
        Vector2D snakepos_b4 = {_x[1],_y[1]}; //Obtains the snake position.
        return snakepos_b4;
    }
    else if(length==7)  {
        Vector2D snakepos_b4 = {_x[2],_y[2]}; //Obtains the snake position.
        return snakepos_b4;
    }
    else if(length==8)  {
        Vector2D snakepos_b4 = {_x[3],_y[3]}; //Obtains the snake position.
        return snakepos_b4;
    }
    else if(length==9)  {
        Vector2D snakepos_b4 = {_x[4],_y[4]}; //Obtains the snake position.
        return snakepos_b4;
    }
    else if(length==10)  {
        Vector2D snakepos_b4 = {_x[5],_y[5]}; //Obtains the snake position.
        return snakepos_b4;
    }
    else if(length==11)  {
        Vector2D snakepos_b4 = {_x[6],_y[6]}; //Obtains the snake position.
        return snakepos_b4;
    }
    else if(length==12)  {
        Vector2D snakepos_b4 = {_x[7],_y[7]}; //Obtains the snake position.
        return snakepos_b4;
    }
    else if(length==13)  {
        Vector2D snakepos_b4 = {_x[8],_y[8]}; //Obtains the snake position.
        return snakepos_b4;
    }
    else if(length==14)  {
        Vector2D snakepos_b4 = {_x[9],_y[9]}; //Obtains the snake position.
        return snakepos_b4;
    }
    else if(length==15)  {
        Vector2D snakepos_b4 = {_x[10],_y[10]}; //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 == 6)  {
        Vector2D snakepos_b5 = {_x[0],_y[0]}; //Obtains the snake position.
        return snakepos_b5;
    }
    else if(length==7)  {
        Vector2D snakepos_b5 = {_x[1],_y[1]}; //Obtains the snake position.
        return snakepos_b5;
    }
    else if(length==8)  {
        Vector2D snakepos_b5 = {_x[2],_y[2]}; //Obtains the snake position.
        return snakepos_b5;
    }
    else if(length==9)  {
        Vector2D snakepos_b5 = {_x[3],_y[3]}; //Obtains the snake position.
        return snakepos_b5;
    }
    else if(length==10)  {
        Vector2D snakepos_b5 = {_x[4],_y[4]}; //Obtains the snake position.
        return snakepos_b5;
    }
    else if(length==11)  {
        Vector2D snakepos_b5 = {_x[5],_y[5]}; //Obtains the snake position.
        return snakepos_b5;
    }
    else if(length==12)  {
        Vector2D snakepos_b5 = {_x[6],_y[6]}; //Obtains the snake position.
        return snakepos_b5;
    }
    else if(length==13)  {
        Vector2D snakepos_b5 = {_x[7],_y[7]}; //Obtains the snake position.
        return snakepos_b5;
    }
    else if(length==14)  {
        Vector2D snakepos_b5 = {_x[8],_y[8]}; //Obtains the snake position.
        return snakepos_b5;
    }
    else if(length==15)  {
        Vector2D snakepos_b5 = {_x[9],_y[9]}; //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 == 7)  {
        Vector2D snakepos_b6 = {_x[0],_y[0]}; //Obtains the snake position.
        return snakepos_b6;
    }
    else if(length==8)  {
        Vector2D snakepos_b6 = {_x[1],_y[1]}; //Obtains the snake position.
        return snakepos_b6;
    }
    else if(length==9)  {
        Vector2D snakepos_b6 = {_x[2],_y[2]}; //Obtains the snake position.
        return snakepos_b6;
    }
    else if(length==10)  {
        Vector2D snakepos_b6 = {_x[3],_y[3]}; //Obtains the snake position.
        return snakepos_b6;
    }
    else if(length==11)  {
        Vector2D snakepos_b6 = {_x[4],_y[4]}; //Obtains the snake position.
        return snakepos_b6;
    }
    else if(length==12)  {
        Vector2D snakepos_b6 = {_x[5],_y[5]}; //Obtains the snake position.
        return snakepos_b6;
    }
    else if(length==13)  {
        Vector2D snakepos_b6 = {_x[6],_y[6]}; //Obtains the snake position.
        return snakepos_b6;
    }
    else if(length==14)  {
        Vector2D snakepos_b6 = {_x[7],_y[7]}; //Obtains the snake position.
        return snakepos_b6;
    }
    else if(length==15)  {
        Vector2D snakepos_b6 = {_x[8],_y[8]}; //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 == 8)  {
        Vector2D snakepos_b7 = {_x[0],_y[0]}; //Obtains the snake position.
        return snakepos_b7;
    }
    else if(length==9)  {
        Vector2D snakepos_b7 = {_x[1],_y[1]}; //Obtains the snake position.
        return snakepos_b7;
    }
    else if(length==10)  {
        Vector2D snakepos_b7 = {_x[2],_y[2]}; //Obtains the snake position.
        return snakepos_b7;
    }
    else if(length==11)  {
        Vector2D snakepos_b7 = {_x[3],_y[3]}; //Obtains the snake position.
        return snakepos_b7;
    }
    else if(length==12)  {
        Vector2D snakepos_b7 = {_x[4],_y[4]}; //Obtains the snake position.
        return snakepos_b7;
    }
    else if(length==13)  {
        Vector2D snakepos_b7 = {_x[5],_y[5]}; //Obtains the snake position.
        return snakepos_b7;
    }
    else if(length==14)  {
        Vector2D snakepos_b7 = {_x[6],_y[6]}; //Obtains the snake position.
        return snakepos_b7;
    }
    else if(length==15)  {
        Vector2D snakepos_b7 = {_x[7],_y[7]}; //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 == 9)  {
        Vector2D snakepos_b8 = {_x[0],_y[0]}; //Obtains the snake position.
        return snakepos_b8;
    }
    else if(length==10)  {
        Vector2D snakepos_b8 = {_x[1],_y[1]}; //Obtains the snake position.
        return snakepos_b8;
    }
    else if(length==11)  {
        Vector2D snakepos_b8 = {_x[2],_y[2]}; //Obtains the snake position.
        return snakepos_b8;
    }
    else if(length==12)  {
        Vector2D snakepos_b8 = {_x[3],_y[3]}; //Obtains the snake position.
        return snakepos_b8;
    }
    else if(length==13)  {
        Vector2D snakepos_b8 = {_x[4],_y[4]}; //Obtains the snake position.
        return snakepos_b8;
    }
    else if(length==14)  {
        Vector2D snakepos_b8 = {_x[5],_y[5]}; //Obtains the snake position.
        return snakepos_b8;
    }
    else if(length==15)  {
        Vector2D snakepos_b8 = {_x[6],_y[6]}; //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 == 10)  {
        Vector2D snakepos_b9 = {_x[0],_y[0]}; //Obtains the snake position.
        return snakepos_b9;
    }
    else if(length==11)  {
        Vector2D snakepos_b9 = {_x[1],_y[1]}; //Obtains the snake position.
        return snakepos_b9;
    }
    else if(length==12)  {
        Vector2D snakepos_b9 = {_x[2],_y[2]}; //Obtains the snake position.
        return snakepos_b9;
    }
    else if(length==13)  {
        Vector2D snakepos_b9 = {_x[3],_y[3]}; //Obtains the snake position.
        return snakepos_b9;
    }
    else if(length==14)  {
        Vector2D snakepos_b9 = {_x[4],_y[4]}; //Obtains the snake position.
        return snakepos_b9;
    }
    else if(length==15)  {
        Vector2D snakepos_b9 = {_x[5],_y[5]}; //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 == 11)  {
        Vector2D snakepos_b10 = {_x[0],_y[0]}; //Obtains the snake position.
        return snakepos_b10;
    }
    else if(length==12)  {
        Vector2D snakepos_b10 = {_x[1],_y[1]}; //Obtains the snake position.
        return snakepos_b10;
    }
    else if(length==13)  {
        Vector2D snakepos_b10 = {_x[2],_y[2]}; //Obtains the snake position.
        return snakepos_b10;
    }
    else if(length==14)  {
        Vector2D snakepos_b10 = {_x[3],_y[3]}; //Obtains the snake position.
        return snakepos_b10;
    }
    else if(length==15)  {
        Vector2D snakepos_b10 = {_x[4],_y[4]}; //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 == 12)  {
        Vector2D snakepos_b11 = {_x[0],_y[0]}; //Obtains the snake position.
        return snakepos_b11;
    }
    else if(length==13)  {
        Vector2D snakepos_b11 = {_x[1],_y[1]}; //Obtains the snake position.
        return snakepos_b11;
    }
    else if(length==14)  {
        Vector2D snakepos_b11 = {_x[2],_y[2]}; //Obtains the snake position.
        return snakepos_b11;
    }
    else if(length==15)  {
        Vector2D snakepos_b11 = {_x[3],_y[3]}; //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 == 13)  {
        Vector2D snakepos_b12 = {_x[0],_y[0]}; //Obtains the snake position.
        return snakepos_b12;
    }
    else if(length==14)  {
        Vector2D snakepos_b12 = {_x[1],_y[1]}; //Obtains the snake position.
        return snakepos_b12;
    }
    else if(length==15)  {
        Vector2D snakepos_b12 = {_x[2],_y[2]}; //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 == 14)  {
        Vector2D snakepos_b13 = {_x[0],_y[0]}; //Obtains the snake position.
        return snakepos_b13;
    }
    else if(length==15)  {
        Vector2D snakepos_b13 = {_x[1],_y[1]}; //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==15)  {
        Vector2D snakepos_b14 = {_x[0],_y[0]}; //Obtains the snake position.
        return snakepos_b14;
    }
    else  {
        Vector2D snakepos_b14 = {-20,-20}; //Obtains the snake position.
        return snakepos_b14;
    }
    //printf("snakepos from player = %f %f \n", snakepos.x, snakepos.y);
}



void Snake::update(Direction d,float mag,int length, int speed, int* b0_to_b14)
{
    _speed = speed;  //Speed changes depending on how much you push the joystick.(As Of Now)
    b[0] = b0_to_b14[0];
    b[1] = b0_to_b14[1];
    b[2] = b0_to_b14[2];
    b[3] = b0_to_b14[3];
    b[4] = b0_to_b14[4];
    b[5] = b0_to_b14[5];
    b[6] = b0_to_b14[6];
    b[7] = b0_to_b14[7];
    b[8] = b0_to_b14[8];
    b[9] = b0_to_b14[9];
    b[10] = b0_to_b14[10];
    b[11] = b0_to_b14[11];
    b[12] = b0_to_b14[12];
    b[13] = b0_to_b14[13];
    b[14] = b0_to_b14[14];
    
    if(length > 1)  {
        if ((_x[0] > _x[1])&&(b[1] == 1)&&(b[0] == 1))  {
            _x[0]-=_speed;    
        }
        if ((_x[0] < _x[1])&&(b[1] == 1)&&(b[0] == 1))  {
            _x[0]+=_speed;    
        }
    }
    if(length > 2)  {
        if ((_x[1] > _x[2])&&(b[2] == 1)&&(b[1] == 1))  {
            _x[1]-=_speed;    
        }
        if ((_x[1] < _x[2])&&(b[2] == 1)&&(b[1] == 1))  {
            _x[1]+=_speed;    
        }
    }
    if(length > 3)  {
        if ((_x[2] > _x[3])&&(b[3] == 1)&&(b[2] == 1))  {
            _x[2]-=_speed;    
            }
        if ((_x[2] < _x[3])&&(b[3] == 1)&&(b[2] == 1))  {
            _x[2]+=_speed;    
            }
    }
    if(length > 4)  {
        if ((_x[3] > _x[4])&&(b[4] == 1)&&(b[3] == 1))  {
            _x[3]-=_speed;    
        }
        if ((_x[3] < _x[4])&&(b[4] == 1)&&(b[3] == 1))  {
            _x[3]+=_speed;    
        }
    }
    if(length > 5)  {
        if ((_x[4] > _x[5])&&(b[5] == 1)&&(b[4] == 1))  {
            _x[4]-=_speed;    
        }
        if ((_x[4] < _x[5])&&(b[5] == 1)&&(b[4] == 1))  {
            _x[4]+=_speed;    
        }
    }
    if(length > 6)  {
        if ((_x[5] > _x[6])&&(b[6] == 1)&&(b[5] == 1))  {
            _x[5]-=_speed;    
        }
    if ((_x[5] < _x[6])&&(b[6] == 1)&&(b[5] == 1))  {
            _x[5]+=_speed;    
        }
    }
    if(length > 7)  {
        if ((_x[6] > _x[7])&&(b[7] == 1)&&(b[6] == 1))  {
            _x[6]-=_speed;    
        }
        if ((_x[6] < _x[7])&&(b[7] == 1)&&(b[6] == 1))  {
            _x[6]+=_speed;    
        }
    }
    if(length > 8)  {
        if ((_x[7] > _x[8])&&(b[8] == 1)&&(b[7] == 1))  {
            _x[7]-=_speed;    
        }
        if ((_x[7] < _x[8])&&(b[8] == 1)&&(b[7] == 1))  {
            _x[7]+=_speed;    
        }
    }
    if(length > 9)  {
        if ((_x[8] > _x[9])&&(b[9] == 1)&&(b[8] == 1))  {
            _x[8]-=_speed;    
        }
        if ((_x[8] < _x[9])&&(b[9] == 1)&&(b[8] == 1))  {
            _x[8]+=_speed;    
        }
    }
    if(length > 10)  {
        if ((_x[9] > _x[10])&&(b[10] == 1)&&(b[9] == 1))  {
            _x[9]-=_speed;    
        }
        if ((_x[9] < _x[10])&&(b[10] == 1)&&(b[9] == 1))  {
            _x[9]+=_speed;    
        }
    }
    if(length > 11)  {
        if ((_x[10] > _x[11])&&(b[11] == 1)&&(b[10] == 1))  {
            _x[10]-=_speed;    
        }
        if ((_x[10] < _x[11])&&(b[11] == 1)&&(b[10] == 1))  {
            _x[10]+=_speed;    
        }
    }
    if(length > 12)  {
        if ((_x[11] > _x[12])&&(b[12] == 1)&&(b[11] == 1))  {
            _x[11]-=_speed;    
        }
        if ((_x[11] < _x[12])&&(b[12] == 1)&&(b[11] == 1))  {
            _x[11]+=_speed;    
        }
    }
    if(length > 13)  {
        if ((_x[12] > _x[13])&&(b[13] == 1)&&(b[12] == 1))  {
            _x[12]-=_speed;    
        }
        if ((_x[12] < _x[13])&&(b[13] == 1)&&(b[12] == 1))  {
            _x[12]+=_speed;    
        }
    }
    if(length > 14)  {
        if ((_x[13] > _x[14])&&(b[14] == 1)&&(b[13] == 1))  {
            _x[13]-=_speed;    
        }
        if ((_x[13] < _x[14])&&(b[14] == 1)&&(b[13] == 1))  {
            _x[13]+=_speed;                                                      
        }
    }
    
    if((length == 15)&&(b[14] == 1))  {
        if (d == E) {
            _x[14]+= _speed;
        }
        if (d == W) {
            _x[14]-= _speed;
        }
    }
    if((length == 14)&&(b[13] == 1))  {
        if (d == E) {
            _x[13]+= _speed;
        }
        if (d == W) {
            _x[13]-= _speed;
        }
    }
    if((length == 13)&&(b[12] == 1))  {
        if (d == E) {
            _x[12]+= _speed;
        }
        if (d == W) {
            _x[12]-= _speed;
        }
    }
    if((length == 12)&&(b[11] == 1))  {
        if (d == E) {
            _x[11]+= _speed;
        }
        if (d == W) {
            _x[11]-= _speed;
        }
    }
    if((length == 11)&&(b[10] == 1))  {
        if (d == E) {
            _x[10]+= _speed;
        }
        if (d == W) {
            _x[10]-= _speed;
        }
    }
    if((length == 10)&&(b[9] == 1))  {
        if (d == E) {
            _x[9]+= _speed;
        }
        if (d == W) {
            _x[9]-= _speed;
        }
    }
    if((length == 9)&&(b[8] == 1))  {
        if (d == E) {
            _x[8]+= _speed;
        }
        if (d == W) {
            _x[8]-= _speed;
        }
    }
    if((length == 8)&&(b[7] == 1))  {
        if (d == E) {
            _x[7]+= _speed;
        }
        if (d == W) {
            _x[7]-= _speed;
        }
    }
    if((length == 7)&&(b[6] == 1))  {
        if (d == E) {
            _x[6]+= _speed;
        }
        if (d == W) {
            _x[6]-= _speed;
        }
    }
    if((length == 6)&&(b[5] == 1))  {
        if (d == E) {
            _x[5]+= _speed;
        }
        if (d == W) {
            _x[5]-= _speed;
        }
    }
    if((length == 5)&&(b[4] == 1))  {
        if (d == E) {
            _x[4]+= _speed;
        }
        if (d == W) {
            _x[4]-= _speed;
        }
    }
    if((length == 4)&&(b[3] == 1))  {
        if (d == E) {
            _x[3]+= _speed;
        }
        if (d == W) {
            _x[3]-= _speed;
        }
    }
    if((length == 3)&&(b[2] == 1))  {
        if (d == E) {
            _x[2]+= _speed;
        }
        if (d == W) {
            _x[2]-= _speed;
        }
    }
    if((length == 2)&&(b[1] == 1))  {
        if (d == E) {
            _x[1]+= _speed;
        }
        if (d == W) {
            _x[1]-= _speed;
        }
    }
    if((length == 1)&&(b[0] == 1))  {
        if (d == E) {
            _x[0]+= _speed;
        }
        if (d == W) {
            _x[0]-= _speed;
        }
    }

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

    if(length < 2)  {
        _x[1] = _x[0];
    }
    else if(length < 3)  {
        _x[2] = _x[1];
    }
    else if(length < 4)  {
        _x[3] = _x[2];
    }
    else if(length < 5)  {
        _x[4] = _x[3];
    }
    else if(length < 6)  {
        _x[5] = _x[4];
    }
    else if(length < 7)  {
        _x[6] = _x[5];
    }
    else if(length < 8)  {
        _x[7] = _x[6];
    }
    else if(length < 9)  {
        _x[8] = _x[7];
    }
    else if(length < 10)  {
        _x[9] = _x[8];
    }
    else if(length < 11) {
        _x[10] = _x[9];
    }
    else if(length < 12)  {
        _x[11] = _x[10];
    }
    else if(length < 13)  {
        _x[12] = _x[11];
    }
    else if(length < 14)  {
        _x[13] = _x[12];
    }
    else if(length < 15)  {
        _x[14] = _x[13];
    }
    
    //Limits set so that the sprite does not travel off the screen.
    if (_y[0] <= 0) {
        _y[0] = 0;
    }
    if (_x[0] <= 0) {
        _x[0] = 0;
    }
    if (_x[1] <= 0) {
        _x[1] = 0;
    }
    if (_x[2] <= 0) {
        _x[2] = 0;
    }
    if (_x[3] <= 0) {
        _x[3] = 0;
    }
    if (_x[4] <= 0) {
        _x[4] = 0;
    }
    if (_x[5] <= 0) {
        _x[5] = 0;
    }
    if (_x[6] <= 0) {
        _x[6] = 0;
    }
    if (_x[7] <= 0) {
        _x[7] = 0;
    }
    if (_x[8] <= 0) {
        _x[8] = 0;
    }
    if (_x[9] <= 0) {
        _x[9] = 0;
    }
    if (_x[10] <= 0) {
        _x[10] = 0;
    }
    if (_x[11] <= 0) {
        _x[11] = 0;
    }
    if (_x[12] <= 0) {
        _x[12] = 0;
    }
    if (_x[13] <= 0) {
        _x[13] = 0;
    }
    if (_x[14] <= 0) {
        _x[14] = 0;
    }
    if (_x[0] > 81) {
        _x[0] = 81;
    }
    if (_x[1] > 81) {
        _x[1] = 81;
    }
    if (_x[2] > 81) {
        _x[2] = 81;
    }
    if (_x[3] > 81) {
        _x[3] = 81;
    }
    if (_x[4] > 81) {
        _x[4] = 81;
    }
    if (_x[5] > 81) {
        _x[5] = 81;
    }
    if (_x[6] > 81) {
        _x[6] = 81;
    }
    if (_x[7] > 81) {
        _x[7] = 81;
    }
    if (_x[8] > 81) {
        _x[8] = 81;
    }
    if (_x[9] > 81) {
        _x[9] = 81;
    }
    if (_x[10] > 81) {
        _x[10] = 81;
    }
    if (_x[11] > 81) {
        _x[11] = 81;
    }
    if (_x[12] > 81) {
        _x[12] = 81;
    }
    if (_x[13] > 81) {
        _x[13] = 81;
    }
    if (_x[14] > 81) {
        _x[14] = 81;
    }
}