Add support for bottom flashing messages

src/constants.rs

@@ -2,6 +2,7 @@
 /// Fast PC mode at 400 cycles/ms.
 pub const CLOCK_PERIOD: f32 = 0.184;
 pub const PLAYER_STEP_PERIOD: f32 = 1.0 / 7.5;
+pub const FLASHING_PERIOD: f32 = 0.02;
 
 pub const SIDEBAR_POS_X: i32 = 66;
 pub const SIDEBAR_POS_Y: i32 = 0;

src/graphics/flashing_message.rs

@@ -0,0 +1,18 @@
+use crate::constants::*;
+use crate::graphics::vga_color as vga;
+use crate::resources::Resources;
+use bracket_lib::prelude::*;
+
+pub fn draw(resources: &mut Resources, bterm: &mut BTerm) {
+    if let Some(flashing_message) = &mut resources.flashing_message {
+        flashing_message.next_color();
+
+        bterm.print_color_centered_at(
+            MAP_X + (MAP_WIDTH / 2) - 1,
+            MAP_Y + MAP_HEIGHT,
+            RGB::named(vga::get_by_index(flashing_message.color)),
+            RGB::named(vga::BLACK),
+            format!(" {} ", &flashing_message.message),
+        );
+    }
+}

src/graphics/mod.rs

@@ -4,15 +4,17 @@ use hecs::World;
 use crate::resources::Resources;
 
 mod entities;
+mod flashing_message;
 mod map;
 mod sidebar;
 pub mod vga_color;
 mod whip;
 
-pub fn draw(world: &World, resources: &Resources, bterm: &mut BTerm) {
+pub fn draw(world: &World, resources: &mut Resources, bterm: &mut BTerm) {
     bterm.cls();
     map::draw(resources, bterm);
     entities::draw(world, bterm);
     whip::draw(world, resources, bterm);
+    flashing_message::draw(resources, bterm);
     sidebar::draw(resources, bterm);
 }

src/input/mod.rs

@@ -6,17 +6,26 @@ use crate::resources::*;
 mod player;
 
 pub fn handle(world: &mut World, resources: &mut Resources, bterm: &mut BTerm) {
+    if resources.flashing_message.is_some() {
+        if bterm.key.is_some() {
+            resources.flashing_message = None;
+        }
+    } else {
         match bterm.key {
             None => {}
             Some(key) => match key {
                 VirtualKeyCode::Left | VirtualKeyCode::J => {
                     player::try_move(-1, 0, world, resources);
                 }
-            VirtualKeyCode::U | VirtualKeyCode::Home => player::try_move(-1, -1, world, resources),
+                VirtualKeyCode::U | VirtualKeyCode::Home => {
+                    player::try_move(-1, -1, world, resources)
+                }
                 VirtualKeyCode::Up | VirtualKeyCode::I => {
                     player::try_move(0, -1, world, resources);
                 }
-            VirtualKeyCode::O | VirtualKeyCode::PageUp => player::try_move(1, -1, world, resources),
+                VirtualKeyCode::O | VirtualKeyCode::PageUp => {
+                    player::try_move(1, -1, world, resources)
+                }
                 VirtualKeyCode::Right | VirtualKeyCode::K => {
                     player::try_move(1, 0, world, resources);
                 }
@@ -26,7 +35,9 @@ pub fn handle(world: &mut World, resources: &mut Resources, bterm: &mut BTerm) {
                 VirtualKeyCode::Down | VirtualKeyCode::M => {
                     player::try_move(0, 1, world, resources);
                 }
-            VirtualKeyCode::N | VirtualKeyCode::End => player::try_move(-1, 1, world, resources),
+                VirtualKeyCode::N | VirtualKeyCode::End => {
+                    player::try_move(-1, 1, world, resources)
+                }
                 VirtualKeyCode::W => {
                     player::whip(world, resources);
                 }
@@ -36,6 +47,10 @@ pub fn handle(world: &mut World, resources: &mut Resources, bterm: &mut BTerm) {
                 VirtualKeyCode::Escape | VirtualKeyCode::Q => {
                     bterm.quit();
                 }
+                VirtualKeyCode::P => {
+                    resources.flashing_message =
+                        Some(FlashingMessage::from("Press any key to resume game."));
+                }
                 _ => {
                     resources
                         .sound_output
@@ -44,3 +59,4 @@ pub fn handle(world: &mut World, resources: &mut Resources, bterm: &mut BTerm) {
             },
         }
     }
+}

src/main.rs

@@ -57,6 +57,7 @@ fn main() -> BError {
         sound_effects,
         sound_output,
         selected_difficulty: Some(selected_difficulty),
+        flashing_message: None,
     };
 
     // let descent_sounds: Vec<Sound> = (20..100)

src/resources/flashing_message.rs

@@ -0,0 +1,32 @@
+use std::time::{Duration, Instant};
+
+use crate::constants::*;
+
+pub struct FlashingMessage {
+    pub message: String,
+    pub color: usize,
+    pub last_changed_color: Instant,
+}
+
+impl FlashingMessage {
+    pub fn next_color(&mut self) {
+        let now = Instant::now();
+        if now - self.last_changed_color > Duration::from_secs_f32(FLASHING_PERIOD) {
+            self.color += 1;
+            if self.color > 15 {
+                self.color = 13
+            }
+            self.last_changed_color = now;
+        }
+    }
+}
+
+impl From<&str> for FlashingMessage {
+    fn from(message: &str) -> Self {
+        Self {
+            message: message.to_string(),
+            color: 14,
+            last_changed_color: Instant::now(),
+        }
+    }
+}

src/resources/mod.rs

@@ -1,5 +1,6 @@
 pub mod clock;
 pub mod difficulty;
+pub mod flashing_message;
 pub mod map;
 pub mod sound_effects;
 pub mod sound_output;
@@ -8,6 +9,7 @@ pub mod stats;
 use bracket_lib::prelude::*;
 pub use clock::{Clock, StopClock};
 pub use difficulty::Difficulty;
+pub use flashing_message::FlashingMessage;
 pub use map::Map;
 pub use sound_effects::SoundEffects;
 pub use sound_output::SoundOutput;
@@ -24,4 +26,5 @@ pub struct Resources {
     pub selected_difficulty: Option<Difficulty>,
     pub sound_effects: SoundEffects,
     pub sound_output: SoundOutput,
+    pub flashing_message: Option<FlashingMessage>,
 }

src/state.rs

@@ -12,7 +12,7 @@ impl GameState for State {
     fn tick(&mut self, bterm: &mut BTerm) {
         input::handle(&mut self.world, &mut self.resources, bterm);
         systems::run(&mut self.world, &mut self.resources);
-        graphics::draw(&self.world, &self.resources, bterm);
+        graphics::draw(&self.world, &mut self.resources, bterm);
     }
 }
 

src/systems/time.rs

@@ -5,7 +5,7 @@ use crate::constants::CLOCK_PERIOD;
 use crate::resources::{Clock, Resources};
 
 pub fn run(resources: &mut Resources) {
-    if !resources.stop_clock {
+    if !resources.stop_clock && resources.flashing_message.is_none() {
         try_tick(&mut resources.clock);
     } else {
         reset(&mut resources.clock);