monsters move and attack the player

src/main.rs

@@ -1,5 +1,6 @@
 use std::io::Result;
 use std::io::stdout;
+use std::time::Instant;
 
 use crossterm::{
     event::{self, KeyCode, KeyEventKind},
@@ -30,6 +31,9 @@ mod level_generator;
 mod artifacts;
 mod monster;
 
+/// length of a game frame in ms
+pub const FRAME_LENGTH: u64 = 100;
+
 //
 fn main() -> Result<()> {
     let mut game = Game::new(Player::new(realname().as_str(), 10));
@@ -39,6 +43,8 @@ fn main() -> Result<()> {
     let mut terminal = Terminal::new(CrosstermBackend::new(stdout()))?;
     terminal.clear()?;
 
+    let start_time = Instant::now();
+    let mut ticks = 0;
     loop {
         terminal.draw(|frame| {
             let mut area = frame.size();
@@ -57,7 +63,7 @@ fn main() -> Result<()> {
                     .block(block)
                     .wrap(Wrap { trim: true });
                 frame.render_widget(paragraph, area);
-                return
+                return;
             }
 
             if area.width > 80 {
@@ -96,7 +102,7 @@ fn main() -> Result<()> {
                 stats_area,
             );
         })?;
-        if event::poll(std::time::Duration::from_millis(100))? {
+        if event::poll(std::time::Duration::from_millis(FRAME_LENGTH))? {
             if let event::Event::Key(key) = event::read()? {
                 if key.kind == KeyEventKind::Press && key.code == KeyCode::Char('q') {
                     break;
@@ -117,11 +123,13 @@ fn main() -> Result<()> {
                 }
             }
         }
-        game.update_level();
+        game.update_level(ticks);
         if game.get_game_state() != GameState::RUNNING {
             break;
         }
+        ticks += 1;
     }
+    let playtime = start_time.elapsed();
     loop {
         let _ = terminal.draw(|frame| {
             let mut area = frame.size();
@@ -151,6 +159,7 @@ fn main() -> Result<()> {
             };
             text += format!("\nYou gained {} experience.", game.get_player().get_experience()).as_str();
             text += format!("\nYou collected {} gold.", game.get_player().get_gold()).as_str();
+            text += format!("\nYou played {} seconds.", playtime.as_secs()).as_str();
             let paragraph = Paragraph::new(text).block(block).wrap(Wrap { trim: true });
             frame.render_widget(paragraph, area);
         });