Move this from private repo

.gitignore

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server/Cargo.lock

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server/Cargo.toml

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+[package]
+name = "server"
+version = "0.1.0"
+authors = ["Johann Woelper <johann.woelper@king.com>"]
+
+[dependencies]
+serde = "1.0"
+serde_derive = "1.0"
+serde_json = "1.0"
+rand = "0.5"

server/src/main.rs

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+use std::time::{SystemTime};
+use rand::Rng;
+
+
+#[macro_use]
+extern crate serde_derive;
+
+extern crate rand;
+extern crate serde;
+extern crate serde_json;
+
+
+/*
+UNITS
+
+mass = kilogram
+time = sec
+distance = meter
+speed = meter / tick (s)
+
+*/
+
+// Time constants
+const TICK: i32 = 1;
+const SECOND: i32 = TICK;
+const MINUTE: i32 = SECOND*60;
+const HOUR: i32 = MINUTE*60;
+const DAY: i32 = HOUR*24;
+const MONTH: i32 = DAY*30;
+const YEAR: i32 = MONTH*12;
+// weight constants
+const KG: f32 = 1.0;
+const TON: f32 = KG*1000.0;
+
+#[derive(Serialize, Deserialize, Debug)]
+enum Diets {
+    Carnivore,
+    Herbivore,
+    Omnivore,
+    Photovore
+}
+
+#[derive(Serialize, Deserialize, Debug)]
+enum LifeformKind {
+    Fauna,
+    Flora,
+}
+
+#[derive(Serialize, Deserialize, Debug)]
+struct Biome {
+    width: f32,
+    height: f32,
+    water: f32,
+    biomass: f32,
+    lifeforms: Vec<Lifeform>
+}
+
+
+impl Biome {
+    fn tick(&mut self){
+
+        for lifeform in &mut self.lifeforms {
+            if lifeform.alive {
+                lifeform.tick();
+                self.water -= lifeform.water_intake;
+            } else {
+                self.biomass += lifeform.mass;
+                lifeform.mass = 0.0;
+            }
+
+
+
+            //keep lifeform in bounds
+            //TODO: clamp
+            if lifeform.position[0] < 0.0 {
+                lifeform.position[0] = 0.0;
+            }
+            if lifeform.position[0] > self.width {
+                lifeform.position[0] = self.width;
+            }
+
+            if lifeform.position[2] > self.height {
+                lifeform.position[2] = self.height;
+            }
+            if lifeform.position[2] < 0.0 {
+                lifeform.position[2] = 0.0;
+            }
+
+        }
+    }
+
+    // fn lf_move(&mut self, mut lf: &Lifeform) {
+       
+    // }
+
+    // fn lf_eat(&mut self) {
+    //     for lf in self.lifeforms {
+
+    //     }
+    // }
+}
+
+#[derive(Serialize, Deserialize, Debug)]
+struct Lifeform {
+    name: String,
+    mass: f32,
+    age: i32,
+    maxage: i32,
+    water_intake: f32,
+    nutrient_intake: f32,
+    diet: Diets,
+    kind: LifeformKind,
+    alive: bool,
+    position: Vec<f32>,
+    speed: f32,
+}
+
+
+// TODO: add position
+impl Lifeform {
+    fn tick(&mut self){
+        if self.alive {
+            self.mass += self.nutrient_intake;
+            self.age += 1;
+        }
+        if self.age > self.maxage {
+            self.alive = false;
+            println!("Died: {:?}", self);
+        }
+        self.move_random();
+    }
+    fn move_random(&mut self) {
+        let mut rng = rand::thread_rng();
+        let rx = rng.gen_range::<f32>(-1.0, 1.0);
+        let rz = rng.gen_range::<f32>(-1.0, 1.0);
+        self.position[0] += rx*self.speed;
+        self.position[2] += rz*self.speed;
+    }
+}
+
+impl Default for Lifeform {
+    fn default() -> Lifeform {
+        Lifeform {
+            name: "Generic Plant".to_string(),
+            mass: 1.0,
+            age: 0,
+            water_intake: 1.0/DAY as f32,
+            nutrient_intake: 1.0/DAY as f32,
+            diet: Diets::Herbivore,
+            kind: LifeformKind::Flora,
+            maxage: YEAR,
+            alive: true,
+            position: vec![0.0, 0.0, 0.0],
+            speed: 0.0,
+        }
+    }
+}
+
+fn main() {
+    let start = SystemTime::now();
+    println!("{:?}", start);
+
+    let mut biome = Biome {width: 1000.0, height: 1000.0, water: 1000.0, lifeforms: Vec::new(), biomass: TON};
+
+
+    // add some trees
+    for _i in 1..400 {
+        let mut rng = rand::thread_rng();
+        let age = rng.gen_range::<i32>(1*MONTH, 10*YEAR);
+        let maxage = rng.gen_range::<i32>(5*YEAR, 50*YEAR);
+        let mass = rng.gen_range::<f32>(50.0, 6.0*TON);
+        let water_intake = rng.gen_range::<f32>(50.0, 150.0)/DAY as f32;
+        let mut tree = Lifeform {
+            name: "Tree".to_string(),
+            age: age,
+            maxage: maxage,
+            mass: mass,
+            water_intake: water_intake,
+            diet: Diets::Photovore,
+            alive: true,
+            kind: LifeformKind::Flora,
+            ..Default::default()
+            };
+
+        biome.lifeforms.push(tree);
+    }
+
+    // add deer
+    for _i in 1..10 {
+        let mut rng = rand::thread_rng();
+        let age = rng.gen_range::<i32>(1*MONTH, 5*YEAR);
+        let maxage = rng.gen_range::<i32>(1*YEAR, 5*YEAR);
+        let mass = rng.gen_range::<f32>(4.0, 17.0);
+        let water_intake = rng.gen_range::<f32>(0.5, 1.0)/DAY as f32;
+        let speed = rng.gen_range::<f32>(0.0/HOUR as f32, 10000.0/HOUR as f32) as f32;
+        
+        let mut deer = Lifeform {
+            name: "Deer".to_string(),
+            kind: LifeformKind::Fauna,
+            age: age,
+            maxage: maxage,
+            mass: mass,
+            water_intake: water_intake,
+            speed: speed,
+            ..Default::default()};
+        biome.lifeforms.push(deer);
+    }
+
+
+    
+
+
+    for _i in 1..1000 {
+        biome.tick();
+    }
+
+    let serialized = serde_json::to_string(&biome).unwrap();
+    println!("serialized = {}", serialized);
+
+    //let deserialized: Plant = serde_json::from_str(&serialized).unwrap();
+    //println!("deserialized = {:?}", deserialized);
+}