Initial Commit for snake ten_points_to_slytherin

Cargo.toml

@@ -1,7 +1,10 @@
 [package]
 name = "snakebot_rust"
 version = "1.1.0"
-authors = ["Martin Barksten <martin.barksten@cygni.com>"]
+authors = [
+	"Martin Barksten <martin.barksten@cygni.com>",
+	"Joakim Hulthe <joakim@hulthe.net>",
+]
 license-file = "LICENSE"
 
 [dependencies]

snake.conf

@@ -1,5 +1,5 @@
 host = "localhost";
 port = 8080;
 
-snake_name = "rusty-snake";
+snake_name = "ten_points_to_slytherin";
 venue = "training";

src/main.rs

@@ -4,7 +4,7 @@
 #[macro_use] extern crate serde_derive;
 #[macro_use] extern crate serde_json;
 extern crate clap;
-extern crate config;
+//extern crate config;
 extern crate log4rs;
 extern crate rustc_version;
 extern crate serde;
@@ -31,9 +31,10 @@ const LOG_TARGET: &'static str = "client";
 const HEART_BEAT_S: u64 = 20;
 
 const CONFIG_FILE: &'static str = "snake.conf";
-const DEFAULT_HOST: &'static str = "snake.cygni.se";
-const DEFAULT_PORT: &'static str = "80";
-const DEFAULT_SNAKE_NAME: &'static str = "default-rust-snake-name";
+//const DEFAULT_HOST: &'static str = "snake.cygni.se";
+const DEFAULT_HOST: &'static str = "localhost";
+const DEFAULT_PORT: &'static str = "8080";
+const DEFAULT_SNAKE_NAME: &'static str = "ten_points_to_slytherin";
 const DEFAULT_VENUE: &'static str = "training";
 
 #[derive(Clone, Debug)]

src/maputil.rs

@@ -1,6 +1,7 @@
 use structs::{ Map, SnakeInfo };
 use util;
 use serde::ser::{ Serialize, Serializer };
+use util::{ translate_position };
 
 #[derive(PartialEq, Debug)]
 pub enum Tile<'a> {
@@ -42,6 +43,18 @@ impl Direction {
 			Direction::Right => ( 1,  0)
 		}
 	}
+
+	pub fn from_movement_delta(delta: (i32,i32)) -> Direction {
+		match delta {
+			(x, y) if y <= -x.abs() => Direction::Up,
+			(x, y) if y >=  x.abs() => Direction::Down,
+			(x, y) if x <= -y.abs() => Direction::Left,
+			(x, y) if x >=  y.abs() => Direction::Right,
+			( _,  _) => {
+				panic!(format!("({}, {}) is not a valid movement delta.", delta.0, delta.1))
+			}
+		}
+	}
 }
 
 impl Map {
@@ -83,6 +96,10 @@ impl Map {
 		match tile {
 			Tile::Empty { coordinate: _ } => true,
 			Tile::Food { coordinate: _ } => true,
+			Tile::SnakeBody { coordinate: _, snake } => {
+				snake.tailProtectedForGameTicks == 0 &&
+				coordinate == translate_position(*snake.positions.last().unwrap(), self.width)
+			},
 			_ => false
 		}
 	}

src/messages.rs

@@ -36,7 +36,7 @@ pub enum Inbound {
 pub fn handle_inbound_msg(s: &str) -> Result<Inbound, Error> {
 	let mut json_value = from_str::<Value>(s)
 		.expect(&format!("Couldn't parse string into JSON: {:?}", s));
-    let mut map = json_value.as_object_mut()
+	let map = json_value.as_object_mut()
 		.expect(&format!("Couldn't parse string into JSON object: {:?}", s));
 	let type_value = map.remove("type").expect(&format!("Couldn't find key `type` in: {:?}", &map));
 	let type_str = type_value.as_str().expect(&format!("Couldn't turn JSON Value into string: {:?}", &map));
@@ -85,4 +85,3 @@ pub fn render_outbound_message(msg: Outbound) -> String {
 		}),
 	}).to_string()
 }
-

src/snake.rs

@@ -1,6 +1,6 @@
 use structs::{ MapUpdate, GameEnded, TournamentEnded, SnakeDead, GameStarting, PlayerRegistered, InvalidPlayerName };
 use maputil::{ Direction };
-use util::{ translate_positions };
+use util::{ translate_positions, translate_position, vector_diff };
 
 const LOG_TARGET: &'static str = "snake";
 
@@ -11,11 +11,36 @@ impl Snake {
 		debug!(target: LOG_TARGET, "Game map updated, tick: {}", msg.gameTick);
 
 		let map = &msg.map;
-        let snake = map.get_snake_by_id(&msg.receivingPlayerId).unwrap();
+		let directions = vec![Direction::Down, Direction::Left, Direction::Right, Direction::Up];
 
-        debug!(target: LOG_TARGET, "Food can be found at {:?}", translate_positions(&map.foodPositions, map.width));
-        debug!(target: LOG_TARGET, "My snake positions are {:?}", translate_positions(&snake.positions, map.width));
-        for &d in [Direction::Down, Direction::Left, Direction::Right, Direction::Up].into_iter() {
+		let snake = map.get_snake_by_id(&msg.receivingPlayerId).unwrap();
+		let snakes = &map.snakeInfos;
+
+		let snake_positions = translate_positions(&snake.positions, map.width);
+		let foodPositions = translate_positions(&map.foodPositions, map.width);
+
+		let facing = match snake_positions.len() {
+			0...1 => Direction::Right,
+			_ => Direction::from_movement_delta(vector_diff(snake_positions[0], snake_positions[1]))
+		};
+		debug!(target: LOG_TARGET, "Food can be found at {:?}", foodPositions);
+		debug!(target: LOG_TARGET, "My snake positions are {:?}", snake_positions);
+
+		for s in snakes {
+			if s.positions.len() == 0 || s.id == snake.id {
+				continue;
+			}
+
+			let tail_position = translate_position(*s.positions.last().unwrap(), map.width);
+			let tail_direction = Direction::from_movement_delta(vector_diff(tail_position, snake_positions[0]));
+
+			if map.can_snake_move_in_direction(snake, tail_direction) {
+				debug!(target: LOG_TARGET, "Snake will hunt in direction {:?}", tail_direction);
+				return tail_direction;
+			}
+		} 
+
+		for &d in directions.iter() {
 			if map.can_snake_move_in_direction(snake, d) {
 				debug!(target: LOG_TARGET, "Snake will move in direction {:?}", d);
 				return d;
@@ -25,6 +50,7 @@ impl Snake {
 		return Direction::Down;
 	}
 
+
 	pub fn on_game_ended(&self, msg: &GameEnded) {
 		debug!(target: LOG_TARGET, "Game ended, the winner is: {:?}", msg.playerWinnerId);
 	}

src/util.rs

@@ -1,3 +1,9 @@
+#[allow(dead_code)]
+pub fn vector_diff(a: (i32, i32), b: (i32, i32)) -> (i32,i32) {(
+		a.0 - b.0,
+		a.1 - b.1,		
+)}
+
 #[allow(dead_code)]
 pub fn translate_position(position: i32, map_width: i32) -> (i32,i32) {
 	let pos = position as f64;