Starting to do physics

src/engine/character/mod.rs

@@ -1,82 +1,199 @@
-use std::time::Duration;
+use std::time::{
+    Instant,
+    Duration,
+};
 
 use sfml::system::Vector2;
 use sfml::window::Event;
-use sfml::graphics::{
-    Drawable,
-    RenderStates,
-    RenderTarget,
-    Sprite,
-    Color,
-};
+use sfml::graphics::IntRect;
+use sfml::window::Key;
 
 use engine::scene::Updatable;
 use engine::controls::Controls;
+use engine::renderer::Drawable;
+use engine::texture::Texture;
+use engine::physics;
+use engine::math::{
+    duration_as_f32,
+    duration_as_frame,
+};
+
+/// The different sides a character can face.
+pub enum Side {
+    /// The character looks to the left.
+    Left,
+
+    /// The character looks to the right.
+    Right,
+}
+
+impl Side {
+    /// Returns the side corresponding to the force.
+    ///
+    /// Returns None if the force is null.
+    pub fn from_force(force: Vector2<f32>) -> Option<Side> {
+        if force.x > 0.0 {
+            Some(Side::Right)
+        } else if force.x < 0.0 {
+            Some(Side::Left)
+        } else {
+            None
+        }
+    }
+
+    /// Returns the offset in the texture.
+    pub fn offset(&self) -> i32 {
+        match *self {
+            Side::Left => 0,
+            Side::Right => 32,
+        }
+    }
+}
 
 /// A character, enemy or controllable.
 pub struct Character {
 
     /// The position of the character.
-    position: Vector2<f32>,
+    pub position: Vector2<f32>,
 
     /// The speed of the character.
-    speed: Vector2<f32>,
+    pub speed: Vector2<f32>,
 
     /// If the player is controlling a character.
     controls: Option<Controls>,
+
+    /// The side of the character.
+    side: Side,
+
+    /// The counter of jumps.
+    ///
+    /// When it's 0, the character can no longer jump.
+    jump_counter: usize,
+
+    /// The maximum number of jumps a character can do.
+    ///
+    /// It's reset when the character hits the ground.
+    max_jump: usize,
+
+    /// The timer of the character's animation.
+    animation_timer: Option<Instant>,
 }
 
 impl Character {
-    /// Creates a character in (0, 0).
-    pub fn new() -> Character {
+
+    fn generic(controls: Option<Controls>) -> Character {
         Character {
             position: Vector2::new(0.0, 0.0),
             speed: Vector2::new(0.0, 0.0),
-            controls: None,
+            controls: controls,
+            side: Side::Right,
+            jump_counter: 1,
+            max_jump: 1,
+            animation_timer: None,
         }
     }
 
+    /// Creates a character in (0, 0).
+    pub fn new() -> Character {
+        Character::generic(None)
+    }
+
     /// Creates a character with the specified controls.
     pub fn with_controls(controls: Controls) -> Character {
-        Character {
-            position: Vector2::new(0.0, 0.0),
-            speed: Vector2::new(0.0, 0.0),
-            controls: Some(controls),
-        }
+        Character::generic(Some(controls))
     }
 
     /// Sets the position of the character.
     pub fn set_position<S: Into<Vector2<f32>>>(&mut self, position: S) {
         self.position = position.into();
     }
+
+    /// Makes the character jump.
+    pub fn jump(&mut self) {
+        if self.jump_counter > 0 {
+            self.jump_counter -= 1;
+            self.speed.y = physics::JUMP_SPEED.y;
+        }
+    }
+
+    /// Resets the jump counter.
+    pub fn ground_collision(&mut self) {
+        self.jump_counter = self.max_jump;
+    }
+
 }
 
 impl Updatable for Character {
     fn update(&mut self, duration: &Duration) {
 
+        let mut force: Vector2<f32> = Vector2::new(0.0, 0.0);
+
+        // Manage the input of the player
+        if Key::Left.is_pressed() {
+            force.x -= 1.0;
+        }
+
+        if Key::Right.is_pressed() {
+            force.x += 1.0;
+        }
+
+        if let Some(side) = Side::from_force(force) {
+
+            self.side = side;
+
+            if self.animation_timer.is_none() {
+                self.animation_timer = Some(Instant::now());
+            }
+
+        } else {
+
+            self.animation_timer = None;
+
+        }
+
+
+        let duration = duration_as_f32(duration);
+
+        // Compute acceleration
+        let accel = physics::G;
+
+        // Compute speed
+        self.speed.x *= physics::GROUND_FRICTION.x;
+        self.speed += accel * duration + force * 64.0;
+
+        // Compute position
+        self.position += self.speed * duration;
+
     }
 
     fn manage_event(&mut self, event: &Event) {
+        match event {
 
+            Event::KeyPressed {
+                code: Key::Return, ..
+            } => self.jump(),
+
+            _ => (),
+        }
     }
 }
 
 impl Drawable for Character {
-    fn draw<'a: 'shader, 'texture, 'shader, 'shader_texture>(
-        &'a self,
-        target: &mut RenderTarget,
-        states: RenderStates<'texture, 'shader, 'shader_texture>
-    ) {
+    fn texture(&self) -> Texture {
+        Texture::Mario
+    }
 
-        use sfml::graphics::Transformable;
-        let mut sprite = Sprite::new();
-        sprite.set_origin((32.0, 0.0));
-        sprite.set_position(self.position);
-        sprite.set_color(&if self.controls.is_some() {
-            Color::rgb(255, 0, 0)
+    fn texture_rect(&self) -> IntRect {
+        let frame = if let Some(started) = self.animation_timer {
+            duration_as_frame(&Instant::now().duration_since(started), 2)
         } else {
-            Color::rgb(255, 255, 255)
-        });
-        sprite.draw(target, states);
+            0
+        };
+
+        IntRect::new(self.side.offset(), frame * 32, 32, 32)
+    }
+
+    fn position(&self) -> Vector2<f32> {
+        self.position
     }
 }

src/engine/math/mod.rs

@@ -1,8 +1,22 @@
+use std::time::Duration;
+
 use std::ops::{
     Index,
     IndexMut
 };
 
+/// Converts a duration into an animation frame number.
+pub fn duration_as_frame(duration: &Duration, total: usize) -> i32 {
+    let secs = duration_as_f32(duration);
+
+    (secs * 4.0) as i32 % total as i32
+}
+
+/// Converts a duration into its number of seconds.
+pub fn duration_as_f32(duration: &Duration) -> f32 {
+    duration.as_secs() as f32 + duration.subsec_nanos() as f32 / 1_000_000_000.0
+}
+
 /// A generic matrix type, useful for levels.
 pub struct Matrix<T> {
 

src/engine/mod.rs

@@ -13,3 +13,9 @@ pub mod texture;
 
 /// This module contains the math tools that will be used.
 pub mod math;
+
+/// This module contains our wrapper of SFML window.
+pub mod renderer;
+
+/// This module contains everything related to physics.
+pub mod physics;

src/engine/physics/mod.rs

@@ -0,0 +1,10 @@
+use sfml::system::Vector2;
+
+/// The gravity force.
+pub const G: Vector2<f32> = Vector2 { x: 0.0, y: 50.0 * 32.0 };
+
+/// The friction with the ground.
+pub const GROUND_FRICTION: Vector2<f32> = Vector2 { x: 0.5, y: 1.0 };
+
+/// The speed of a jump.
+pub const JUMP_SPEED: Vector2<f32> = Vector2 { x: 0.0, y: -600.0 };

src/engine/renderer/mod.rs

@@ -0,0 +1,110 @@
+use std::time::Instant;
+
+use sfml::graphics::{
+    RenderWindow,
+    RenderTarget,
+    Sprite,
+    Color,
+    IntRect,
+};
+
+use sfml::window::{
+    Style,
+    Event,
+};
+
+use sfml::system::{
+    Vector2,
+};
+
+use engine::texture::{Texture, TextureManager};
+use engine::scene::Scene;
+
+/// Our custom drawable trait.
+pub trait Drawable {
+    /// Returns the texture of the drawable.
+    fn texture(&self) -> Texture;
+
+    /// Returns the coordinates to use on the texture.
+    fn texture_rect(&self) -> IntRect;
+
+    /// Returns the position on which the drawable should be drawn.
+    fn position(&self) -> Vector2<f32>;
+}
+
+/// The game window.
+pub struct Renderer {
+
+    /// The window on which the rendering will be done.
+    window: RenderWindow,
+
+    /// The texture manager needed by the renderer.
+    texture_manager: TextureManager,
+
+    /// The global timer of the renderer.
+    started: Instant,
+
+}
+
+impl Renderer {
+    /// Creates a new renderer.
+    pub fn new(width: u32, height: u32) -> Renderer {
+
+        let mut window = RenderWindow::new(
+            (width, height),
+            "Bomberman",
+            Style::CLOSE,
+            &Default::default(),
+        );
+        window.set_vertical_sync_enabled(true);
+        window.set_framerate_limit(60);
+
+        Renderer {
+            window: window,
+            texture_manager: TextureManager::new(),
+            started: Instant::now(),
+        }
+    }
+
+    /// Returns the animation state of the renderer, between 0 and 3.
+    pub fn animation_state(&self) -> i32 {
+        let duration = Instant::now().duration_since(self.started);
+        let ns = 1_000_000_000 * duration.as_secs() + duration.subsec_nanos() as u64;
+        let result = (ns as usize / 250_000_000) % 4;
+        result as i32
+    }
+
+    /// Clears the window.
+    pub fn clear(&mut self) {
+        self.window.clear(&Color::rgb(0, 0, 0));
+    }
+
+    /// Draws a drawable.
+    pub fn draw<D: Drawable>(&mut self, drawable: &D) {
+        let texture = self.texture_manager.get(drawable.texture());
+        let mut sprite = Sprite::with_texture(&texture);
+        sprite.set_texture_rect(&drawable.texture_rect());
+
+        use sfml::graphics::Transformable;
+        sprite.set_position(drawable.position());
+
+        self.window.draw(&sprite);
+    }
+
+    /// Draws a scene on the window.
+    pub fn draw_scene(&mut self, scene: &Scene) {
+        for c in scene.characters() {
+            self.draw(c);
+        }
+    }
+
+    /// Triggers the display.
+    pub fn display(&mut self) {
+        self.window.display();
+    }
+
+    /// Check if there are new events, returns the top of the stack.
+    pub fn poll_event(&mut self) -> Option<Event> {
+        self.window.poll_event()
+    }
+}

src/engine/scene/mod.rs

@@ -1,11 +1,6 @@
 use std::time::Duration;
 
 use sfml::window::Event;
-use sfml::graphics::{
-    RenderTarget,
-    RenderStates,
-    Drawable,
-};
 
 use engine::character::Character;
 
@@ -14,6 +9,7 @@ pub struct Scene {
 
     /// The characters contained in the scene.
     characters: Vec<Character>,
+
 }
 
 impl Scene {
@@ -32,8 +28,15 @@ impl Scene {
 
     /// Updates the whole scene.
     pub fn update(&mut self, duration: &Duration) {
+
         for c in &mut self.characters {
             c.update(duration);
+
+            if c.position.y > 500.0 {
+                c.position.y = 500.0;
+                c.speed.y = 0.0;
+                c.ground_collision();
+            }
         }
     }
 
@@ -43,22 +46,12 @@ impl Scene {
             c.manage_event(event);
         }
     }
-}
 
-impl Drawable for Scene {
-    fn draw<'a: 'shader, 'texture, 'shader, 'shader_texture>(
-        &'a self,
-        target: &mut RenderTarget,
-        states: RenderStates<'texture, 'shader, 'shader_texture>
-    ) {
+    /// Returns a reference to the characters of the scene.
+    pub fn characters(&self) -> &Vec<Character> {
+        &self.characters
+    }
 
-        for c in &self.characters {
-            let mut s = RenderStates::default();
-            s.transform = states.transform.clone();
-            s.blend_mode = states.blend_mode;
-            c.draw(target, s);
-        }
-    }
 }
 
 /// Trait that needs to be implemented for everything that can be updatable.

src/engine/texture/mod.rs

@@ -57,12 +57,13 @@ macro_rules! make_textures {
 }
 
 make_textures!(
+    Mario, mario, make_mario_texture, "../../../assets/textures/mario.png",
 );
 
 impl TextureManager {
     /// Creates a textures from an array of bytes.
     fn make_texture_from_bytes(bytes: Vec<u8>) -> SfTexture {
-        SfTexture::from_memory(&bytes, &IntRect::new(0, 0, 500, 500))
+        SfTexture::from_memory(&bytes, &IntRect::new(0, 0, 256, 256))
             .expect("Failed to create texture")
     }
 }

src/game/main.rs

@@ -7,21 +7,14 @@ use std::time::{
 };
 
 use sfml::window::{
-    ContextSettings,
-    Style,
     Event,
     Key,
 };
 
-use sfml::graphics::{
-    RenderWindow,
-    RenderTarget,
-    Color,
-};
-
 use rusty::engine::scene::Scene;
 use rusty::engine::character::Character;
 use rusty::engine::controls::Controls;
+use rusty::engine::renderer::Renderer;
 
 fn main() {
     let game_width = 800;
@@ -32,27 +25,16 @@ fn main() {
 
     let mut scene = Scene::new();
     scene.add(character);
-    scene.add(Character::new());
 
-    let context_settings = ContextSettings {
-        ..Default::default()
-    };
-
-    let mut window = RenderWindow::new(
-        (game_width, game_height),
-        "Free Rusty Maker",
-        Style::CLOSE,
-        &context_settings,
-    );
-
-    window.set_framerate_limit(60);
+    let mut renderer = Renderer::new(game_width, game_height);
 
+    let mut after_loop = None;
     let mut running = true;
 
     loop {
 
         // Manage the events
-        while let Some(event) = window.poll_event() {
+        while let Some(event) = renderer.poll_event() {
 
             match event {
                 // Quit the game if window is closed
@@ -71,15 +53,23 @@ fn main() {
         }
 
         // Manage the physics
-        // ...
+        let duration = if let Some(instant) = after_loop {
+            Instant::now().duration_since(instant)
+        } else {
+            Duration::from_millis(20)
+        };
 
+        after_loop = Some(Instant::now());
+
+        scene.update(&duration);
 
         // Do the rendering
-        window.clear(&Color::rgb(50, 200, 50));
-        window.draw(&scene);
+        renderer.clear();
+        renderer.draw_scene(&scene);
 
         // Display and manage the frame rate
-        window.display();
+        renderer.display();
+
 
         if ! running {
             break;