game loop done

todo:
- write/read to/from saved games
- win & lose messages

81_Splat/rust/src/celestial_body.rs

@@ -2,16 +2,16 @@ use rand::{prelude::SliceRandom, Rng};
 
 #[derive(Debug)]
 pub enum CelestialBody {
-    Mercury,
-    Venus,
-    Earth,
-    Moon,
-    Mars,
-    Jupiter,
-    Saturn,
-    Uranus,
-    Neptune,
-    Sun,
+    MERCURY,
+    VENUS,
+    EARTH,
+    MOON,
+    MARS,
+    JUPITER,
+    SATURN,
+    URANUS,
+    NEPTUNE,
+    SUN,
 }
 
 impl CelestialBody {
@@ -19,16 +19,16 @@ impl CelestialBody {
         use CelestialBody::*;
 
         match self {
-            Mercury => 12.2,
-            Venus => 28.3,
-            Earth => 32.16,
-            Moon => 5.12,
-            Mars => 12.5,
-            Jupiter => 85.2,
-            Saturn => 37.6,
-            Uranus => 33.8,
-            Neptune => 39.6,
-            Sun => 896.,
+            MERCURY => 12.2,
+            VENUS => 28.3,
+            EARTH => 32.16,
+            MOON => 5.12,
+            MARS => 12.5,
+            JUPITER => 85.2,
+            SATURN => 37.6,
+            URANUS => 33.8,
+            NEPTUNE => 39.6,
+            SUN => 896.,
         }
     }
 
@@ -49,16 +49,16 @@ pub fn random_celestial_body() -> Option<CelestialBody> {
     use CelestialBody::*;
 
     match rand::thread_rng().gen_range(0..10) {
-        0 => Some(Mercury),
-        1 => Some(Venus),
-        2 => Some(Earth),
-        3 => Some(Moon),
-        4 => Some(Mars),
-        5 => Some(Jupiter),
-        6 => Some(Saturn),
-        7 => Some(Uranus),
-        8 => Some(Neptune),
-        9 => Some(Sun),
+        0 => Some(MERCURY),
+        1 => Some(VENUS),
+        2 => Some(EARTH),
+        3 => Some(MOON),
+        4 => Some(MARS),
+        5 => Some(JUPITER),
+        6 => Some(SATURN),
+        7 => Some(URANUS),
+        8 => Some(NEPTUNE),
+        9 => Some(SUN),
         _ => None,
     }
 }

81_Splat/rust/src/game.rs

@@ -1,9 +1,17 @@
 use crate::utility;
 
-pub struct Game {}
+pub struct Game {
+    altitude: f32,
+    terminal_velocity: f32,
+    acceleration: f32,
+    seconds: f32,
+    interval: f32,
+}
 
 impl Game {
     pub fn new() -> Game {
+        let altitude = utility::get_altitude();
+
         let terminal_velocity = utility::get_terminal_velocity(
             "SELECT YOUR OWN TERMINAL VELOCITY",
             "WHAT TERMINAL VELOCITY (MI/HR)?",
@@ -14,10 +22,95 @@ impl Game {
             "WHAT ACCELERATION (FT/SEC/SEC)?",
         );
 
-        Game {}
+        println!("");
+        println!("      ALTITUDE        = {} FT", altitude);
+        println!("      TERM. VELOCITY  = {} FT/SEC +-5%", terminal_velocity);
+        println!("      ACCELERATION    = {} FT/SEC/SEC +-5%", acceleration);
+
+        let seconds =
+            utility::prompt_numeric("\nSET THE TIMER FOR YOUR FREEFALL.\nHOW MANY SECONDS?");
+
+        println!("\nHERE WE GO.\n");
+
+        println!("TIME (SEC)\tDIST TO FALL (FT)");
+        println!("==========\t=================");
+
+        Game {
+            altitude,
+            terminal_velocity,
+            acceleration,
+            seconds,
+            interval: seconds / 8.,
+        }
     }
 
-    pub fn tick(&self) -> Option<bool> {
-        todo!()
+    pub fn tick(&mut self) -> bool {
+        let mut splat = false;
+        let mut terminal_velocity_reached = false;
+
+        let (v, a) = (self.terminal_velocity, self.acceleration);
+        let terminal_velocity_time = v / a;
+
+        let mut final_altitude = self.altitude;
+
+        for i in 0..=8 {
+            let dt = i as f32 * self.interval;
+
+            if dt >= terminal_velocity_time {
+                if !terminal_velocity_reached {
+                    println!(
+                        "TERMINAL VELOCITY REACHED AT T PLUS {} SECONDS.",
+                        terminal_velocity_time
+                    );
+                    terminal_velocity_reached = true;
+                }
+
+                let d1 = v.powi(2) / (2. * a);
+                let d2 = v * (dt - (terminal_velocity_time));
+                final_altitude = self.altitude - (d1 + d2);
+
+                if final_altitude <= 0. {
+                    let t = (self.altitude - d1) / v;
+                    utility::print_splat(t + terminal_velocity_time);
+
+                    splat = true;
+                    break;
+                }
+            } else {
+                let d1 = (a * 0.5) * (dt.powi(2));
+                final_altitude = self.altitude - d1;
+
+                if final_altitude <= 0. {
+                    let t = (2. * self.altitude * a).sqrt();
+                    utility::print_splat(t);
+
+                    splat = true;
+                    break;
+                }
+            }
+
+            println!("{}\t\t{}", dt, final_altitude);
+
+            std::thread::sleep(std::time::Duration::from_secs(1));
+        }
+
+        if !splat {
+            println!("\nCHUTE OPEN\n")
+
+            // get saved statistics from previous games
+            // compare and present a message.
+        }
+
+        use utility::prompt_bool;
+        if !prompt_bool("DO YOU WANT TO PLAY AGAIN?", true) {
+            if !prompt_bool("PLEASE?", false) {
+                if !prompt_bool("YES OR NO PLEASE?", false) {
+                    println!("SSSSSSSSSS.");
+                    return false;
+                }
+            }
+        }
+
+        true
     }
 }

81_Splat/rust/src/main.rs

@@ -10,21 +10,24 @@ fn main() {
 
     println!("WELCOME TO 'SPLAT' -- THE GAME THAT SIMULATES");
     println!("A PARACHUTE JUMP. TRY OPEN YOUR CHUTE AT THE");
-    println!("LAST POSSIBLE MOMENT WITHOUT GOING SPLAT.");
+    println!("LAST POSSIBLE MOMENT WITHOUT GOING SPLAT.\n");
 
-    let mut quit = false;
-
-    while !quit {
-        let game = Game::new();
+    //let mut quit = false;
 
+    // while !quit {
     loop {
+        let mut game = Game::new();
+        if !game.tick() {
+            break;
+        }
+
+        /* loop {
             if let Some(play_again) = game.tick() {
                 if !play_again {
-                    println!("SSSSSSSSSS.");
                     quit = true;
                 }
                 break;
             }
-        }
+        } */
     }
 }

81_Splat/rust/src/utility.rs

@@ -10,8 +10,12 @@ pub fn read_line() -> String {
     input.trim().to_uppercase()
 }
 
-pub fn prompt_bool(msg: &str) -> bool {
+pub fn prompt_bool(msg: &str, template: bool) -> bool {
+    if template {
         println!("{} (YES OR NO)?", msg);
+    } else {
+        println!("{}", msg);
+    }
 
     loop {
         let response = read_line();
@@ -38,23 +42,27 @@ pub fn prompt_numeric(msg: &str) -> f32 {
     }
 }
 
+pub fn get_altitude() -> f32 {
+    9001. * rand::random::<f32>() + 1000.
+}
+
 pub fn get_terminal_velocity(bool_msg: &str, num_msg: &str) -> f32 {
     let mut _num = 0.0;
 
-    if prompt_bool(bool_msg) {
+    if prompt_bool(bool_msg, true) {
         _num = prompt_numeric(num_msg);
     } else {
-        _num = rand::thread_rng().gen_range(0.0..=1000.0);
+        _num = get_random_float(0., 1000.);
         println!("OK. TERMINAL VELOCTY = {} MI/HR", _num);
     }
 
-    _num * ((5280 / 3600) as f32)
+    (_num * ((5280 / 3600) as f32)) * get_random_float(0.95, 1.05)
 }
 
 pub fn get_acceleration(bool_msg: &str, num_msg: &str) -> f32 {
     let mut _num = 0.0;
 
-    if prompt_bool(bool_msg) {
+    if prompt_bool(bool_msg, true) {
         _num = prompt_numeric(num_msg);
     } else {
         let b =
@@ -64,5 +72,14 @@ pub fn get_acceleration(bool_msg: &str, num_msg: &str) -> f32 {
         b.print_acceleration_message();
     }
 
-    _num
+    _num * get_random_float(0.95, 1.05)
+}
+
+fn get_random_float(min: f32, max: f32) -> f32 {
+    rand::thread_rng().gen_range(min..=max)
+}
+
+pub fn print_splat(t: f32) {
+    println!("{}\t\tSPLAT!", t);
+    //get random death message
 }