Added way to print the snake with ascii extended

But ncurses doesn't seem to support ascii extended
so it looks bizzare

src/game/backend.rs

@@ -2,6 +2,7 @@ extern crate rand;
 use core::iter::Iterator;
 use rand::Rng;
 use std::collections::LinkedList;
+use std::ops::Sub;
 use std::thread::sleep;
 use std::time::Duration;
 pub enum Direction {
@@ -58,6 +59,12 @@ impl PartialEq for Cell {
         }
     }
 }
+impl Sub for Cell {
+    type Output = (i32, i32);
+    fn sub(self, rhs: Cell) -> (i32, i32) {
+        return (self.line - rhs.line, self.col - rhs.col);
+    }
+}
 impl Cell {
     pub fn new(l: i32, c: i32, t: CellType) -> Cell {
         Cell {
@@ -80,6 +87,15 @@ impl Cell {
     pub fn chtype(&mut self, ctype: CellType) {
         self.ctype = ctype;
     }
+    pub fn is_adjacent(&self, other: &Cell) -> Option<Direction> {
+        match *self - *other {
+            (0, 1) => Some(Direction::Left),
+            (1, 0) => Some(Direction::Down),
+            (-1, 0) => Some(Direction::Right),
+            (0, -1) => Some(Direction::Up),
+            _ => None,
+        }
+    }
 }
 
 impl Copy for CellType {}
@@ -136,6 +152,7 @@ impl Board {
         let mut snake_iter = snake.iter();
         snake_iter.next();
         for snake_cell in snake_iter {
+            // O(n) ; don't know how to reduce this complexity
             if snake.posyx() == snake_cell.posyx() {
                 self.gamestate = GameState::Failed(FailState::Snake);
                 return true;
@@ -167,6 +184,7 @@ impl Board {
             let mut snake_iter = snake.iter();
             for snake_cell in snake_iter.next() {
                 if *snake_cell == food {
+                    // O(n) ; I think this is nessacary/ I don't know how to reduce the order
                     // if food collides with the snake body then set food to a new random position and set spawned food to false
                     // so that the snake_iter is started again from the front of the snake
                     food = Cell::random(self.maxlines, self.maxcols);

src/game/frontend.rs

@@ -1,7 +1,8 @@
 // use ncurses::*;
-use crate::game::backend::{Board, Snake};
+use crate::game::backend::{Board, Cell, Direction, Snake};
 use ncurses::{
-    box_, delwin, keypad, mvwaddstr, newwin, stdscr, wborder, wclrtobot, wmove, wrefresh, WINDOW,
+    box_, delwin, keypad, mvwaddstr, newwin, stdscr, waddstr, wborder, wclrtobot, wmove, wrefresh,
+    WINDOW,
 };
 pub fn game_window(mlines: i32, mcols: i32, vmargin: i32, hmargin: i32) -> WINDOW {
     let game_win: WINDOW;
@@ -30,13 +31,58 @@ pub fn destroy_window(win: WINDOW) {
 
 pub fn draw_snake(snake: &Snake, game_win: WINDOW) {
     // let mut snake_iter = snake.iter();
+    let (mut prev, mut current, _next): (&Cell, &Cell, &Cell);
+    let mut snake_iter = snake.iter();
     wmove(game_win, 0, 0);
     wclrtobot(game_win);
     box_(game_win, 0, 0);
-    for snake_cell in snake.iter() {
-        let (snake_l, snake_c): (i32, i32) = snake_cell.posyx();
-        mvwaddstr(game_win, snake_l, snake_c, "o");
+
+    // I want to draw the snake as ascii box charachters
+    // So I'll need to know the last and next cell of the snake to draw the current snake_cell
+    // For some reason the snake goes invisible after the first food
+    prev = snake_iter.next().unwrap(); // currently this should be head. On initial run this should be the only snake_cell
+    mvwaddstr(game_win, prev.posyx().0, prev.posyx().1, &format!("H"));
+    let _current = snake_iter.next();
+    // current = match _current {
+    //     Some(cell) => cell,
+    //     None => return,
+    // };
+    if _current.is_some() {
+        current = _current.unwrap();
+    } else {
+        return;
+    } // the match is equivalent to this block of code
+      // this should be none in the initial run
+      // as of now this will panic as soon as the game starts
+      // I need to match this with Some(Cell) and None and if
+      // none then just straight exit from the function
+
+    // The head is never in current so the head is not being printed as of now
+    for next in snake_iter {
+        // O(n) the whole snake is redrawn every single tick
+        let (snake_l, snake_c): (i32, i32) = current.posyx();
+        // mvwaddstr(game_win, snake_l, snake_c, "o");
+        let snake_char = match (
+            prev.is_adjacent(current).unwrap(),
+            next.is_adjacent(current).unwrap(),
+        ) {
+            (Direction::Up, Direction::Down) | (Direction::Down, Direction::Up) => "║", //186, //boxdraw double vertical line ║ code 186
+            (Direction::Up, Direction::Left) | (Direction::Left, Direction::Left) => "╝", //188, // ╝
+            (Direction::Up, Direction::Right) | (Direction::Right, Direction::Up) => "╚", //200, // ╚
+            (Direction::Down, Direction::Left) | (Direction::Left, Direction::Down) => "╗", //187, // ╗
+            (Direction::Down, Direction::Right) | (Direction::Right, Direction::Down) => "╔", //,201, // ╔
+            (Direction::Left, Direction::Right) | (Direction::Right, Direction::Left) => "═", //205 ═
+            _ => " ",
+        };
+        mvwaddstr(
+            game_win, snake_l, snake_c, // &format!("{}", snake_char as char),
+            // &format!("{}", snake_char),
+            "o",
+        );
+        prev = current;
+        current = next;
     }
+    mvwaddstr(game_win, current.posyx().0, current.posyx().1, "t");
     wrefresh(game_win);
 }
 
@@ -60,15 +106,16 @@ pub fn _log(snake: &Snake, board: &Board) {
     //     ),
     // );
 
-    // for snake_cell in snake.iter() {
-    //     let (scl, scc): (i32, i32) = snake_cell.posyx();
-    //     waddstr(stdscr(), &format!("cell: {} {} ", scl, scc));
-    // }
-    // mvwaddstr(
-    //     stdscr(),
-    //     2,
-    //     0,
-    //     &format!("snake_size {}", snake.iter().size_hint().0),
-    // );
+    wmove(stdscr(), 2, 0);
+    for snake_cell in snake.iter() {
+        let (scl, scc): (i32, i32) = snake_cell.posyx();
+        waddstr(stdscr(), &format!("cell: {} {} ", scl, scc));
+    }
+    mvwaddstr(
+        stdscr(),
+        3,
+        0,
+        &format!("snake_size {}", snake.iter().size_hint().0),
+    );
     wrefresh(stdscr());
 }

src/game/mod.rs

@@ -22,9 +22,9 @@ pub fn start() {
     let mut board = Board::new(mlines - vmargin * 2, mcols - hmargin * 2);
     nodelay(game_win, true);
     loop {
-        frontend::draw_snake(&snake, game_win);
+        frontend::draw_snake(&snake, game_win); // always draw snake before board because the snake will clear the game win
         frontend::draw_board(&board, game_win);
-        // frontend::_log(&snake, &board);
+        frontend::_log(&snake, &board);
         if board.check_collision(&snake) {
             // Add stuff here to show the score and
             // how You lose screen

src/main.rs

@@ -17,6 +17,10 @@ fn main() {
     noecho();
     let (mut mlines, mut mcols): (i32, i32) = (0, 0);
     getmaxyx(stdscr(), &mut mlines, &mut mcols);
+    // let (mlines, mcols) = match getmaxyx(stdscr()) {
+    //     Ok(size) => (size.lines, size.columns),
+    //     Err(e) => panic!(e),
+    // };
     if (mlines < 20) || (mcols < 35) {
         refresh();
         endwin();