File content as of revision 20:980b37fde361:

#include "snake.h"

snake::snake(){
    
}


snake::~snake(){
    
}

void snake::init(){   //initialise 
    for (int i = 0; i <_point ; i++) {//the initial length of snake = 6 pixel.  i++ until it = 6 .
         //the position both old and new x are changing as the snake move to east initially. And old and new y keep same position. 
        _xoldpos[i] = 30;       
        _yoldpos[i] = 23; 
        _xnewpos[i] = 30 ; 
        _ynewpos[i] = 23; 
    }
    dir_snake = 3; // 3 = east . initial direction
    _array = 100;
    _point = 6;

}
//direction of the snake 
void snake::update(Direction d,float mag){
    if (dir_snake == 1){
        s() ;}
        else if (dir_snake == 2){
            n();}
            else if (dir_snake == 3){
                e();}
                else if (dir_snake == 4){
                    w();}
    if ((d == S) ) 
               {   dir_snake = 1 ;}
    if ((d == N) )
               {   dir_snake = 2 ;}
    if ((d == E) )
               {   dir_snake = 3 ;}
    if ((d == W) )
               {   dir_snake = 4 ;}
               
}

//draw the snake . the length of the snake is changing as the got point changing
void snake::draw(N5110 &lcd)
{
    for(int i=0; i<_point; i++) {      
        lcd.setPixel(_xnewpos[i],_ynewpos[i]);
           }
}

Vector2D snake::get_pos()//get the position of snake in 2D vector. From pong sample code
{
    Vector2D p = {_xnewpos[0],_ynewpos[0]};
    return p;
}

void snake::set_pos(Vector2D p)//set the position in 2D vector . From pong sample code
{
    _xnewpos[0] = p.x;
    _ynewpos[0] = p.y;

}


void snake::point()//To add the point that the snake ate. 
{
    _point++;

}


int snake::get_point()//used to display the number of point
{
    return _point -6 ; 
}


void snake::n() {//snake move to north
    _xnewpos[0] = _xoldpos[0] ;
    for (int i = 0; i < _array; i++) {
        _xnewpos[i+1] = _xoldpos[i];
       }
    _ynewpos[0] = _yoldpos[0]- 1;
    for (int i = 0; i < _array-1; i++) {
        _ynewpos[i+1] = _yoldpos[i]; 
       }
    for (int i = 0; i < _array; i++) {
        _xoldpos[i] = _xnewpos[i];
        _yoldpos[i] = _ynewpos[i];
      }

}


void snake::s(){//snake move to south 
        _xnewpos[0] = _xoldpos[0] ; 
    for (int i = 0; i < _array; i++) { 
        _xnewpos[i+1] = _xoldpos[i]; 
        } 
    _ynewpos[0] = _yoldpos[0]+ 1;
    for (int i = 0; i < _array-1; i++) {
        _ynewpos[i+1] = _yoldpos[i]; 
        }
    for (int i = 0; i < _array; i++) {
        _xoldpos[i] = _xnewpos[i];
        _yoldpos[i] = _ynewpos[i];
        }
    
}


void snake::w(){//snake move to west
        _xnewpos[0] = _xoldpos[0]-1;
        for (int i = 0; i < _array; i++) {
        _xnewpos[i+1] = _xoldpos[i];
        }
    _ynewpos[0] = _yoldpos[0];
    for (int i = 0; i < _array-1; i++) {
        _ynewpos[i+1] = _yoldpos[i];
        }
    for (int i = 0; i < _array; i++) {
        _xoldpos[i] = _xnewpos[i];
        _yoldpos[i] = _ynewpos[i];
        }
    
}
    

void snake::e(){//snake move to east
        _xnewpos[0] = _xoldpos[0]+1; 
    for (int i = 0; i < _array; i++) {
        _xnewpos[i+1] = _xoldpos[i];
        }
    _ynewpos[0] = _yoldpos[0]; 
    for (int i = 0; i < _array-1; i++) {
        _ynewpos[i+1] = _yoldpos[i]; 
        }
    for (int i = 0; i < _array; i++) {
        _xoldpos[i] = _xnewpos[i];
        _yoldpos[i] = _ynewpos[i];
        }
    
}