From 7649edf43909f10172bf271b6f533ef280a11085 Mon Sep 17 00:00:00 2001
From: unintendedfraud <briceunintendedfraud@fastmail.com>
Date: Fri, 6 Oct 2023 19:06:25 +0200
Subject: [PATCH] flappy dragons

---
 flappy/Cargo.toml  |   9 +++
 flappy/src/main.rs | 196 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 205 insertions(+)
 create mode 100644 flappy/Cargo.toml
 create mode 100644 flappy/src/main.rs

diff --git a/flappy/Cargo.toml b/flappy/Cargo.toml
new file mode 100644
index 0000000..1a0bf2c
--- /dev/null
+++ b/flappy/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "flappy"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+bracket-lib = "~0.8.1"
diff --git a/flappy/src/main.rs b/flappy/src/main.rs
new file mode 100644
index 0000000..0fd0c2c
--- /dev/null
+++ b/flappy/src/main.rs
@@ -0,0 +1,196 @@
+use bracket_lib::prelude::*;
+
+const SCREEN_WIDTH: i32 = 80;
+const SCREEN_HEIGHT: i32 = 50;
+const FRAME_DURATION: f32 = 75.0;
+
+enum GameMode {
+    Menu,
+    Playing,
+    End,
+}
+
+struct State {
+    mode: GameMode,
+    player: Player,
+    frame_time: f32,
+    score: i32,
+    obstacle: Obstacle,
+}
+
+impl State {
+    fn new() -> Self {
+        State {
+            mode: GameMode::Menu,
+            frame_time: 0.0,
+            player: Player::new(5, 25),
+            score: 0,
+            obstacle: Obstacle::new(SCREEN_WIDTH, 0),
+        }
+    }
+
+    fn dead(&mut self, ctx: &mut BTerm) {
+        ctx.cls();
+        ctx.print_centered(8, "You are dead !!");
+        ctx.print_centered(9, &format!("You passed {} obstacles", self.score));
+        ctx.print_centered(11, "(P) Play again");
+        ctx.print_centered(13, "(Q) Quit");
+
+        if let Some(key) = ctx.key {
+            match key {
+                VirtualKeyCode::P => self.restart(),
+                VirtualKeyCode::Q => ctx.quitting = true,
+                _ => {}
+            }
+        }
+    }
+
+    fn play(&mut self, ctx: &mut BTerm) {
+        ctx.cls_bg(NAVY);
+        self.frame_time += ctx.frame_time_ms;
+        if self.frame_time > FRAME_DURATION {
+            self.frame_time = 0.0;
+            self.player.gravity_and_move();
+        }
+
+        if let Some(VirtualKeyCode::Space) = ctx.key {
+            self.player.flap();
+        }
+
+        self.player.render(ctx);
+
+        ctx.print(0, 0, "Press SPACE to fly");
+        ctx.print(0, 1, &format!("Score: {}", self.score));
+
+        self.obstacle.render(ctx, self.player.x);
+
+        if self.player.x > self.obstacle.x {
+            self.score += 1;
+            self.obstacle = Obstacle::new(self.player.x + SCREEN_WIDTH, self.score);
+        }
+
+        if self.player.y > SCREEN_HEIGHT || self.obstacle.hit_player(&self.player) {
+            self.mode = GameMode::End;
+        }
+    }
+
+    fn restart(&mut self) {
+        self.player = Player::new(5, 25);
+        self.frame_time = 0.0;
+        self.mode = GameMode::Playing;
+        self.score = 0;
+        self.obstacle = Obstacle::new(SCREEN_WIDTH, 0);
+    }
+
+    fn main_menu(&mut self, ctx: &mut BTerm) {
+        ctx.cls();
+        ctx.print_centered(8, "Welcome to Flappy Dragons !");
+        ctx.print_centered(10, "(P) Play");
+        ctx.print_centered(12, "(Q) Quit");
+
+        if let Some(key) = ctx.key {
+            match key {
+                VirtualKeyCode::P => self.restart(),
+                VirtualKeyCode::Q => ctx.quitting = true,
+                _ => {}
+            }
+        }
+    }
+}
+
+impl GameState for State {
+    fn tick(&mut self, ctx: &mut BTerm) {
+        match self.mode {
+            GameMode::Menu => self.main_menu(ctx),
+            GameMode::End => self.dead(ctx),
+            GameMode::Playing => self.play(ctx),
+        }
+    }
+}
+
+struct Player {
+    x: i32,
+    y: i32,
+    velocity: f32,
+}
+
+impl Player {
+    fn new(x: i32, y: i32) -> Self {
+        Player {
+            x,
+            y,
+            velocity: 0.0,
+        }
+    }
+
+    fn render(&mut self, ctx: &mut BTerm) {
+        ctx.set(0, self.y, YELLOW, BLACK, to_cp437('@'));
+    }
+
+    fn gravity_and_move(&mut self) {
+        if self.velocity < 2.0 {
+            self.velocity += 0.2;
+        }
+
+        self.y += self.velocity as i32;
+        self.x += 1;
+
+        if self.y < 0 {
+            self.y = 0;
+        }
+    }
+
+    fn flap(&mut self) {
+        self.velocity = -2.0;
+    }
+}
+
+struct Obstacle {
+    x: i32,
+    gap_y: i32,
+    gap_size: i32,
+}
+
+impl Obstacle {
+    fn new(x: i32, score: i32) -> Self {
+        let mut random = RandomNumberGenerator::new();
+
+        Obstacle {
+            x,
+            gap_y: random.range(10, 40),
+            gap_size: i32::max(2, 20 - score),
+        }
+    }
+
+    fn render(&mut self, ctx: &mut BTerm, player_x: i32) {
+        let screen_x = self.x - player_x;
+        let half_size = self.gap_size / 2;
+
+        // Top half of the obstacle
+        for y in 0..self.gap_y - half_size {
+            ctx.set(screen_x, y, RED, BLACK, to_cp437('|'))
+        }
+
+        // Bottom half of the obstacle
+        for y in self.gap_y + half_size..SCREEN_HEIGHT {
+            ctx.set(screen_x, y, RED, BLACK, to_cp437('|'))
+        }
+    }
+
+    fn hit_player(&mut self, player: &Player) -> bool {
+        let half_size = self.gap_size / 2;
+        let does_x_match = player.x == self.x;
+        let player_above_gap = player.y < self.gap_y - half_size;
+        let player_below_gap = player.y > self.gap_y + half_size;
+
+        does_x_match && (player_above_gap || player_below_gap)
+    }
+}
+
+fn main() -> BError {
+    let ctx = BTermBuilder::simple80x50()
+        .with_title("Flappy Dragon")
+        .build()?;
+
+    main_loop(ctx, State::new())
+}