File content as of revision 63:205f0ca48473:

#include "Snake.h"

Snake::Snake()
{

}

Snake::~Snake()
{

}

//The Snake Sprite.
int snake_sprite[3][3] = {
    {0,1,0},
    {1,0,1},
    {0,1,0},
};

void Snake::init()
{
    _speed = 1;// change this according to the options selected
    m = 0; //Variable used to allow a starting location for the player.
}


void Snake::draw(N5110 &lcd, int length, int level)
{
    _length = length;
    if(m == 0) {
        _x[0] = WIDTH/2;  //Spawns player sprite near the middle of the screen.
        _y[0] = HEIGHT - 3;

        for(int i=0; i<=13; i++)  {
            _x[i+1] = _x[i];
            _y[i+1] = _y[i] - 3;
            b[i] = 1;
        }
        b[14] = 1;
        m = m+1;
    }
    //printf("SPRITE %d %d \n", _x[0], _y[0]);

    for(int a=1; a<=10; a++)  {
        if(_length == a)  {
            for(int i=0; i<=a-1; i++)  {
                lcd.drawSprite(_x[i],_y[i],3,3,(int *)snake_sprite); //Function used to draw the sprite.
            }
        }
    }
    if(_length >= 10) {
        for(int a=1; a<=10; a++)  {
            for(int i=0; i<=a-1; i++)  {
                lcd.drawSprite(_x[i],_y[i],3,3,(int *)snake_sprite); //Function used to draw the sprite.
            }
        }
    }
}


Vector2D Snake::get_pos()
{
    for(int i=1; i<=10; i++)  {
        if(_length == i)  {
            Vector2D snakepos = {_x[i-1],_y[i-1]}; //Obtains the snake position.
            return snakepos;
        }
    }
    if(_length >= 10)  {
        Vector2D snakepos = {_x[9],_y[9]}; //Obtains the snake position.
        return snakepos;
    }
    Vector2D snakepos = {-20,-20}; //Obtains the snake position.
    return snakepos;
    //printf("snakepos from player = %f %f \n", snakepos.x, snakepos.y);
}

Vector2D Snake::get_pos_before1()  //this sends data of following sprites.
{
    for(int i=2; i<=10; i++)  {
        if(_length == i)  {
            Vector2D snakepos_b1 = {_x[i-2],_y[i-2]}; //Obtains the snake position.
            return snakepos_b1;
        }
    }
    if(_length >= 10)  {
        Vector2D snakepos_b1 = {_x[8],_y[8]}; //Obtains the snake position.
        return snakepos_b1;
    }
    Vector2D snakepos_b1 = {-20,-20}; //Obtains the snake position.
    return snakepos_b1;
    //printf("snakepos_b1 from player = %f %f \n", snakepos_b1.x, snakepos_b1.y);
}

Vector2D Snake::get_pos_before2()  //this sends data of following sprites.
{
    for(int i=3; i<=10; i++)  {
        if(_length == i)  {
            Vector2D snakepos_b2 = {_x[i-3],_y[i-3]}; //Obtains the snake position.
            return snakepos_b2;
        }
    }
    if(_length >= 10)  {
        Vector2D snakepos_b2 = {_x[7],_y[7]}; //Obtains the snake position.
        return snakepos_b2;
    }
    Vector2D snakepos_b2 = {-20,-20}; //Obtains the snake position.
    return snakepos_b2;
    //printf("snakepos_b2 from player = %f %f \n", snakepos_b2.x, snakepos_b2.y);
}

Vector2D Snake::get_pos_before3()  //this sends data of following sprites.
{
    for(int i=4; i<=10; i++)  {
        if(_length == i)  {
            Vector2D snakepos_b3 = {_x[i-4],_y[i-4]}; //Obtains the snake position.
            return snakepos_b3;
        }
    }
    if(_length >= 10)  {
        Vector2D snakepos_b3 = {_x[6],_y[6]}; //Obtains the snake position.
        return snakepos_b3;
    }
    Vector2D snakepos_b3 = {-20,-20}; //Obtains the snake position.
    return snakepos_b3;
    //printf("snakepos_b3 from player = %f %f \n", snakepos_b3.x, snakepos_b3.y);
}

Vector2D Snake::get_pos_before4()  //this sends data of following sprites.
{
    for(int i=5; i<=10; i++)  {
        if(_length == i)  {
            Vector2D snakepos_b4 = {_x[i-5],_y[i-5]}; //Obtains the snake position.
            return snakepos_b4;
        }
    }
    if(_length >= 10)  {
        Vector2D snakepos_b4 = {_x[5],_y[5]}; //Obtains the snake position.
        return snakepos_b4;
    }
    Vector2D snakepos_b4 = {-20,-20}; //Obtains the snake position.
    return snakepos_b4;
    //printf("snakepos_b4 from player = %f %f \n", snakepos_b4.x, snakepos_b4.y);
}

Vector2D Snake::get_pos_before5()  //this sends data of following sprites.
{
    for(int i=6; i<=10; i++)  {
        if(_length == i)  {
            Vector2D snakepos_b5 = {_x[i-6],_y[i-6]}; //Obtains the snake position.
            return snakepos_b5;
        }
    }
    if(_length >= 10)  {
        Vector2D snakepos_b5 = {_x[4],_y[4]}; //Obtains the snake position.
        return snakepos_b5;
    }
    Vector2D snakepos_b5 = {-20,-20}; //Obtains the snake position.
    return snakepos_b5;
    //printf("snakepos_b5 from player = %f %f \n", snakepos_b5.x, snakepos_b5.y);
}

Vector2D Snake::get_pos_before6()  //this sends data of following sprites.
{
    for(int i=7; i<=10; i++)  {
        if(_length == i)  {
            Vector2D snakepos_b6 = {_x[i-7],_y[i-7]}; //Obtains the snake position.
            return snakepos_b6;
        }
    }
    if(_length >= 10)  {
        Vector2D snakepos_b6 = {_x[3],_y[3]}; //Obtains the snake position.
        return snakepos_b6;
    }
    Vector2D snakepos_b6 = {-20,-20}; //Obtains the snake position.
    return snakepos_b6;
    //printf("snakepos_b6 from player = %f %f \n", snakepos_b6.x, snakepos_b6.y);
}

Vector2D Snake::get_pos_before7()  //this sends data of following sprites.
{
    for(int i=8; i<=10; i++)  {
        if(_length == i)  {
            Vector2D snakepos_b7 = {_x[i-8],_y[i-8]}; //Obtains the snake position.
            return snakepos_b7;
        }
    }
    if(_length >= 10)  {
        Vector2D snakepos_b7 = {_x[2],_y[2]}; //Obtains the snake position.
        return snakepos_b7;
    }
    Vector2D snakepos_b7 = {-20,-20}; //Obtains the snake position.
    return snakepos_b7;
    //printf("snakepos_b7 from player = %f %f \n", snakepos_b7.x, snakepos_b7.y);
}

Vector2D Snake::get_pos_before8()  //this sends data of following sprites.
{
    for(int i=9; i<=10; i++)  {
        if(_length == i)  {
            Vector2D snakepos_b8 = {_x[i-9],_y[i-9]}; //Obtains the snake position.
            return snakepos_b8;
        }
    }
    if(_length >= 10)  {
        Vector2D snakepos_b8 = {_x[1],_y[1]}; //Obtains the snake position.
        return snakepos_b8;
    }
    Vector2D snakepos_b8 = {-20,-20}; //Obtains the snake position.
    return snakepos_b8;
    //printf("snakepos_b8 from player = %f %f \n", snakepos_b8.x, snakepos_b8.y);
}

Vector2D Snake::get_pos_before9()  //this sends data of following sprites.
{
    for(int i=10; i<=10; i++)  {
        if(_length == i)  {
            Vector2D snakepos_b9 = {_x[i-10],_y[i-10]}; //Obtains the snake position.
            return snakepos_b9;
        }
    }
    if(_length >= 10)  {
        Vector2D snakepos_b9 = {_x[0],_y[0]}; //Obtains the snake position.
        return snakepos_b9;
    }
    Vector2D snakepos_b9 = {-20,-20}; //Obtains the snake position.
    return snakepos_b9;
    //printf("snakepos_b9 from player = %f %f \n", snakepos_b9.x, snakepos_b9.y);
}

void Snake::update(Direction d, int* b)
{
    if(_length >= 10) {
        _length = 10;   //to stop the snake length virtually at 10 when it goes past it.
    }

    //this makes all of the snake beeds chained together by making the lower ones drag towards where the top one was in the previous loop
    //the b[i] makes sure that the snake beed doesn't move if that beed is deactivated by colliding with a barrier. b[i] also signifies the specific beed number by i.
    for(int i=0; i<=13; i++)  {
        if((_length > i+1)&&(_x[i] != _x[i+1]))  {
            if ((_x[i] > _x[i+1])&&(b[i+1] == 1)&&(b[i] == 1))  {
                _x[i]-=_speed;
            }
            if ((_x[i] < _x[i+1])&&(b[i+1] == 1)&&(b[i] == 1))  {
                _x[i]+=_speed;
            }
        }
    }
    //this makes the controls of W/E directions only exclusive to the top beed in the snake
    for(int i=14; i>=0; i--)  {
        if((_length == i+1)&&(b[i] == 1))  {

            if (d == E) {
                _x[i]+= _speed;
            }

            if (d == W) {
                _x[i]-= _speed;
            }

        }
    }

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

    for(int i=2; i<=15; i++)  {

        if(_length < i)  {
            _x[i-1] = _x[i-2];
        }
    }

    //Limits set so that the snake does not travel off the screen.
    for(int i=0; i<=14; i++)  {

        if (_x[i] <= 0) {
            _x[i] = 0;
        }

        if (_x[i] > 81) {
            _x[i] = 81;
        }
    }
}