commit bd342efae7ece8807e866b0361988b3f7802da14
Author: Levi Pearson <levi.pearson@harman.com>
Date:   Thu Apr 7 19:47:18 2016 -0600

    Initial check-in of game code

diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..886c1f7
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,846 @@
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+ "piston-gfx_texture 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "piston-shaders_graphics2d 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "piston2d-graphics 0.16.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rusttype 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "shader_version 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "piston2d-graphics"
+version = "0.16.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "interpolation 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "piston-texture 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "piston-viewport 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "read_color 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "vecmath 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "piston_window"
+version = "0.40.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "gfx 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gfx_device_gl 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "piston 0.19.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "piston2d-gfx_graphics 0.25.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "piston2d-graphics 0.16.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pistoncore-glutin_window 0.22.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "shader_version 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "pistoncore-event_loop"
+version = "0.19.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "piston-viewport 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pistoncore-input 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pistoncore-window 0.16.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "time 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "pistoncore-glutin_window"
+version = "0.22.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "gl 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glutin 0.4.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pistoncore-input 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pistoncore-window 0.16.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "shader_version 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "pistoncore-input"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bitflags 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "piston-viewport 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc-serialize 0.3.18 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "pistoncore-window"
+version = "0.16.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "pistoncore-input 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "shader_version 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "png"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bitflags 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "flate2 0.2.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "inflate 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num 0.1.31 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rand"
+version = "0.3.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.9 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rayon"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "deque 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num_cpus 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "read_color"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "rustc-serialize"
+version = "0.3.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "rustc_version"
+version = "0.1.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "semver 0.1.20 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rusttype"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "arrayvec 0.3.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "linked-hash-map 0.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ndarray 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "stb_truetype 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "semver"
+version = "0.1.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "serde"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "shader_version"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "shared_library"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "lazy_static 0.1.15 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.9 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "shell32-sys"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "winapi 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "stb_truetype"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "byteorder 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "tempfile"
+version = "1.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "kernel32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "time"
+version = "0.1.35"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "kernel32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "user32-sys"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "winapi 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "vecmath"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "piston-float 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "wayland-client"
+version = "0.5.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bitflags 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wayland-scanner 0.5.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wayland-sys 0.5.9 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "wayland-kbd"
+version = "0.3.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bitflags 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "dlib 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 0.1.15 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memmap 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wayland-client 0.5.9 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "wayland-scanner"
+version = "0.5.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "xml-rs 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "wayland-sys"
+version = "0.5.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "dlib 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 0.1.15 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "wayland-window"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "byteorder 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tempfile 1.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wayland-client 0.5.9 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "winapi"
+version = "0.2.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "winapi-build"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "x11-dl"
+version = "2.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "dylib 0.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.9 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "xml-rs"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bitflags 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "xml-rs"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bitflags 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..b20a98c
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,13 @@
+[package]
+
+name = "getting-started-spinning-square"
+version = "0.1.0"
+authors = [
+	"Levi Pearson <levipearson@gmail.com>"
+]
+
+[[bin]]
+name = "spinning-square"
+
+[dependencies]
+piston_window = "0.40.0"
diff --git a/src/game.rs b/src/game.rs
new file mode 100644
index 0000000..1f86c95
--- /dev/null
+++ b/src/game.rs
@@ -0,0 +1,339 @@
+use piston_window::*;
+use piston_window::math::*;
+use piston_window::draw_state::Blend;
+use std::f64::consts::*;
+
+static TURN_RATE: Scalar = 4.0;
+static THRUST_RATE: Scalar = 4.0;
+
+struct Controls {
+    up_d: bool,
+    down_d: bool,
+    left_d: bool,
+    right_d: bool,
+    fire: bool
+}
+
+impl Controls {
+    fn new() -> Self {
+        Controls {
+            up_d: false, down_d: false, left_d: false, right_d: false,
+            fire: false
+        }
+    }
+
+    fn update(&mut self, inp: Input) {
+        match inp {
+            Input::Press(b) => {
+                match b {
+                    Button::Keyboard(Key::Up)    => { self.up_d    = true; }
+                    Button::Keyboard(Key::Down)  => { self.down_d  = true; }
+                    Button::Keyboard(Key::Left)  => { self.left_d  = true; }
+                    Button::Keyboard(Key::Right) => { self.right_d = true; }
+                    _ => {}
+                }
+            }
+            Input::Release(b) => {
+                match b {
+                    Button::Keyboard(Key::Up)    => { self.up_d    = false; }
+                    Button::Keyboard(Key::Down)  => { self.down_d  = false; }
+                    Button::Keyboard(Key::Left)  => { self.left_d  = false; }
+                    Button::Keyboard(Key::Right) => { self.right_d = false; }
+                    Button::Keyboard(Key::Space) => { self.fire    = true; }
+                    _ => {}
+                }
+            }
+            _ => {}
+        }
+    }
+
+    fn velocity_change(&self, rot: Scalar, dt: Scalar) -> Vec2d {
+        let thrust = if self.up_d {
+            THRUST_RATE * dt
+        } else if self.down_d {
+            -THRUST_RATE * dt
+        } else {
+            0.0
+        };
+        if thrust != 0.0 {
+            [rot.cos() * thrust, rot.sin() * thrust]
+        } else {
+            [0.0, 0.0]
+        }
+    }
+
+    fn rotation_change(&self, dt: Scalar) -> Scalar {
+        if self.left_d {
+            -TURN_RATE * dt
+        } else if self.right_d {
+            TURN_RATE * dt
+        } else {
+            0.0
+        }
+    }
+
+    fn fire_check(&self) -> bool {
+        self.fire
+    }
+}
+
+const BULLET_POLY: &'static [[Scalar; 2]] = &[
+    [-1.5, -1.5],
+    [-1.5, 1.5],
+    [1.5, 1.5],
+    [1.5, -1.5]
+];
+
+#[derive(Debug)]
+pub struct Bullet {
+    position: Vec2d,
+    velocity: Vec2d,
+    ttl: Scalar,
+    geometry: &'static [[Scalar; 2]]
+}
+
+const SHIP_POLY: &'static [[Scalar; 2]] = &[
+    [-10.0, -8.0],
+    [10.0, 0.0],
+    [-10.0, 8.0]
+];
+
+impl Bullet {
+    pub fn new(loc: Vec2d, velocity: Vec2d, ttl: Scalar) -> Self {
+        Bullet {
+            position: loc,
+            velocity: velocity,
+            ttl: ttl,
+            geometry: BULLET_POLY
+        }
+    }
+
+    pub fn update(&mut self, dt: Scalar) -> Scalar {
+        self.position = add(self.position, self.velocity);
+        self.ttl -= dt;
+        self.ttl
+    }
+}
+
+pub struct Ship {
+    rotation: Scalar,
+    position: Vec2d,
+    velocity: Vec2d,
+    geometry: &'static [[Scalar; 2]]
+}
+
+impl Ship {
+    pub fn new(loc: Vec2d) -> Self {
+        Ship {
+            rotation: -FRAC_PI_2,
+            position: loc,
+            velocity: [0.0, 0.0],
+            geometry: SHIP_POLY
+        }
+    }
+
+    pub fn update(&mut self, dv: Vec2d, dr: Scalar, map: &Map) {
+        self.rotation += dr;
+        self.velocity = add(self.velocity, dv);
+        self.position = add(self.position, self.velocity);
+        if self.position[0] > map.width {
+            self.velocity[0] = 0.0;
+            self.position[0] = map.width;
+        }
+        if self.position[0] < 0.0 {
+            self.velocity[0] = 0.0;
+            self.position[0] = 0.0;
+        }
+        if self.position[1] > map.height {
+            self.velocity[1] = 0.0;
+            self.position[1] = map.height;
+        }
+        if self.position[1] < 0.0 {
+            self.velocity[1] = 0.0;
+            self.position[1] = 0.0;
+        }
+    }
+
+    pub fn trajectory(&self) -> (Vec2d, Vec2d, Vec2d) {
+        let nose = self.geometry[1];
+        let rot = rotate_radians(self.rotation);
+        let trans = translate(self.position);
+        let tmat = multiply(trans, rot);
+        (transform_pos(tmat, nose), transform_vec(rot, [1.0,0.0]), self.velocity)
+    }
+}
+
+pub struct Camera {
+    position: Vec2d,
+    height: Scalar,
+    width: Scalar
+}
+
+impl Camera {
+    pub fn new(pos: Vec2d, width: Scalar, height: Scalar) -> Self {
+        Camera {
+            position: pos,
+            width: width,
+            height: height
+        }
+    }
+
+    pub fn follow(&mut self, pos: Vec2d, map: &Map) {
+        let dp = sub(pos, self.position);
+        let xmargin = self.width / 4.0;
+        let ymargin = self.height / 4.0;
+
+        if dp[0] > xmargin {
+            self.position[0] += dp[0] - xmargin;
+        }
+        if dp[0] < -xmargin {
+            self.position[0] += dp[0] + xmargin;
+        }
+        if dp[1] > ymargin {
+            self.position[1] += dp[1] - ymargin;
+        }
+        if dp[1] < -ymargin {
+            self.position[1] += dp[1] + ymargin;
+        }
+
+        if self.position[0] + self.width / 2.0 > map.width {
+            self.position[0] = map.width - self.width / 2.0;
+        }
+        if self.position[0] - self.width / 2.0 < 0.0 {
+            self.position[0] = 0.0 + self.width / 2.0;
+        }
+        if self.position[1] + self.height / 2.0 > map.height {
+            self.position[1] = map.height - self.height / 2.0;
+        }
+        if self.position[1] - self.height / 2.0 < 0.0 {
+            self.position[1] = 0.0 + self.height / 2.0;
+        }
+
+    }
+}
+
+pub struct Map {
+    width: Scalar,
+    height: Scalar
+}
+
+impl Map {
+    pub fn new(width: Scalar, height: Scalar) -> Self {
+        Map { width: width, height: height }
+    }
+    pub fn center(&self) -> Vec2d {
+        [self.width / 2.0, self.height / 2.0]
+    }
+    pub fn draw_grid<G>(&self, cpos: Vec2d,
+                        cw: Scalar, ch: Scalar,
+                        draw_state: &DrawState,
+                        transform: Matrix2d, g: &mut G)
+        where G: Graphics {
+
+        const GREEN: [f32; 4] = [0.0, 1.0, 0.0, 0.05];
+
+        let minx = cpos[0] - cw / 2.0;
+        let miny = cpos[1] - ch / 2.0;
+
+        let xcount = (cw / 100.0).ceil() as u32 + 2;
+        let ycount = (ch / 100.0).ceil() as u32 + 2;
+
+        let firstx = (minx / 100.0).trunc() * 100.0;
+        let firsty = (miny / 100.0).trunc() * 100.0;
+
+        for x in 0..xcount {
+            let sy = cpos[1] - ch;
+            let ey = cpos[1] + ch;
+            let lx = firstx + (100.0 * x as Scalar);
+            Line::new(GREEN, 1.0)
+                .draw([lx-cpos[0], sy-cpos[1], lx-cpos[0], ey-cpos[1]],
+                      draw_state, transform, g);
+        }
+        for y in 0..ycount {
+            let sx = cpos[0] - cw;
+            let ex = cpos[0] + cw;
+            let ly = firsty + (100.0 * y as Scalar);
+            Line::new(GREEN, 1.0)
+                .draw([sx-cpos[0], ly-cpos[1], ex-cpos[0], ly-cpos[1]],
+                      draw_state, transform, g);
+        }
+    }
+}
+
+pub struct Game {
+    player: Ship,
+    bullets: Vec<Bullet>,
+    map: Map,
+    camera: Camera,
+    controls: Controls
+}
+
+impl Game {
+    pub fn new(width: Scalar, height: Scalar) -> Self {
+        let new_map = Map::new(10000.0, 10000.0);
+        let center = new_map.center();
+        Game {
+            player: Ship::new(center),
+            bullets: Vec::new(),
+            map: new_map,
+            camera: Camera::new(center, width, height),
+            controls: Controls::new()
+        }
+    }
+
+    pub fn render(&mut self, args: RenderArgs, w: PistonWindow) {
+        const BLACK: [f32; 4] = [0.0, 0.0, 0.0, 1.0];
+        const WHITE: [f32; 4] = [1.0, 1.0, 1.0, 1.0];
+        const RED:   [f32; 4] = [1.0, 0.0, 0.0, 1.0];
+
+        let rotation = self.player.rotation;
+        let cpos = sub(self.player.position, self.camera.position);
+
+        let (x, y) = ((args.width / 2) as Scalar + cpos[0],
+                      (args.height / 2) as Scalar + cpos[1]);
+
+        w.draw_2d(|c, gl| {
+            let transform = c.transform
+                .trans(x, y)
+                .rot_rad(rotation);
+            let cp = self.camera.position;
+            let cw = self.camera.width;
+            let ch = self.camera.height;
+            let ct = c.transform.trans((args.width / 2) as Scalar,
+                                       (args.height / 2) as Scalar);
+            let ds = c.draw_state.blend(Blend::Alpha);
+
+            clear(BLACK, gl);
+            self.map.draw_grid(cp, cw, ch, &ds, ct, gl);
+            for bullet in self.bullets.iter() {
+                let bpos = sub(bullet.position, self.camera.position);
+                let (bx, by) = ((args.width / 2) as Scalar + bpos[0],
+                                (args.height / 2) as Scalar + bpos[1]);
+                let btrans = c.transform.trans(bx, by);
+                Polygon::new(WHITE).draw(bullet.geometry, &ds, btrans, gl);
+            }
+            Polygon::new(RED).draw(self.player.geometry, &ds, transform, gl);
+        });
+    }
+
+    pub fn update(&mut self, args: UpdateArgs) {
+        let dv = self.controls.velocity_change(self.player.rotation, args.dt);
+        let dr = self.controls.rotation_change(args.dt);
+        let firing = self.controls.fire_check();
+
+        self.player.update(dv, dr, &self.map);
+        for bullet in self.bullets.iter_mut() { bullet.update(args.dt); }
+        self.bullets.retain(|&ref bullet| bullet.ttl > 0.0);
+        if firing {
+            let (nose, dir, vel) = self.player.trajectory();
+            let bul = Bullet::new(nose, add(vel,mul_scalar(dir, 3.0)), 2.0);
+            self.bullets.push(bul);
+            self.controls.fire = false;
+        }
+        self.camera.follow(self.player.position, &self.map);
+    }
+
+    pub fn input(&mut self, inp: Input) {
+        self.controls.update(inp);
+    }
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..dbf8dbc
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,42 @@
+extern crate piston_window;
+use piston_window::*;
+use piston_window::math::{Scalar};
+
+mod game;
+use game::Game;
+
+const XDIM: u32 = 600;
+const YDIM: u32 = 600;
+
+fn main() {
+    let window: PistonWindow = WindowSettings::new(
+        "spinning-square",
+        [XDIM, YDIM]
+    )
+        .exit_on_esc(true)
+        .samples(8)
+        .vsync(true)
+        .build()
+        .unwrap();
+
+    // Create a new game and run it.
+    let mut game = Game::new(XDIM as Scalar, YDIM as Scalar);
+    for e in window {
+        match e.event {
+            Some(Event::Update(upd)) => {
+                game.update(upd);
+            }
+
+            Some(Event::Render(ren)) => {
+                game.render(ren, e);
+            }
+
+            Some(Event::Input(inp)) => {
+                game.input(inp);
+            }
+            _ => {
+
+            }
+        }
+    }
+}