bleh no like

Cargo.toml

@@ -6,9 +6,12 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-nalgebra = { version = "0.32.3", features = ["glam017"] }
-nannou = "0.19.0"
-rapier2d = "0.18.0"
+bevy = { version = "0.12.1" }
+bevy_dylib = "0.12.1"
+bevy_rapier2d = "*"
+
+[profile.dev]
+opt-level = 1
 
 [profile.dev.package."*"]
 opt-level = 3

rust-toolchain.toml

@@ -0,0 +1,2 @@
+[toolchain]
+channel = "nightly"

src/drawable.rs

@@ -1,56 +0,0 @@
-use nannou::prelude::*;
-use rapier2d::geometry::{Collider, ColliderSet, TypedShape};
-
-pub(crate) trait Drawable {
-    fn draw(&self, draw: &Draw);
-}
-
-impl<T> Drawable for Vec<T>
-where
-    T: Drawable,
-{
-    fn draw(&self, draw: &Draw) {
-        self.iter().for_each(|s| s.draw(draw))
-    }
-}
-
-impl Drawable for Collider {
-    fn draw(&self, draw: &Draw) {
-        match self.shape().as_typed_shape() {
-            TypedShape::Ball(ball) => {
-                draw.ellipse()
-                    .radius(ball.radius)
-                    .xy((*self.translation()).into());
-            }
-            TypedShape::Cuboid(cube) => {
-                draw.rect()
-                    .w(cube.half_extents.x * 2.0)
-                    .h(cube.half_extents.y * 2.0)
-                    .xy((*self.translation()).into());
-            }
-            _ => eprintln!("Attempted to draw a shape with no draw impl"),
-        }
-    }
-}
-
-impl Drawable for ColliderSet {
-    fn draw(&self, draw: &Draw) {
-        self.iter().for_each(|(_, collider)| draw.draw(collider))
-    }
-}
-
-pub(crate) trait DrawShape<T>
-where
-    T: Drawable,
-{
-    fn draw(&self, drawable: &T);
-}
-
-impl<T> DrawShape<T> for Draw
-where
-    T: Drawable,
-{
-    fn draw(&self, drawable: &T) {
-        drawable.draw(self);
-    }
-}

src/engine.rs

@@ -1,50 +0,0 @@
-use rapier2d::{
-    dynamics::{
-        CCDSolver, ImpulseJointSet, IntegrationParameters, IslandManager, MultibodyJointSet,
-        RigidBodySet,
-    },
-    geometry::{BroadPhase, ColliderSet, NarrowPhase},
-    math::Vector,
-    pipeline::{PhysicsPipeline, QueryPipeline},
-};
-
-#[derive(Default)]
-pub struct PhysicsEngine {
-    pub state: PhysicsState,
-    pub pipeline: PhysicsPipeline,
-}
-
-#[derive(Default)]
-pub struct PhysicsState {
-    pub islands: IslandManager,
-    pub broad_phase: BroadPhase,
-    pub narrow_phase: NarrowPhase,
-    pub bodies: RigidBodySet,
-    pub colliders: ColliderSet,
-    pub joints: ImpulseJointSet,
-    pub multibody_joints: MultibodyJointSet,
-    pub ccd_solver: CCDSolver,
-    pub query_pipeline: QueryPipeline,
-    pub integration_parameters: IntegrationParameters,
-    pub gravity: Vector<f32>,
-}
-
-impl PhysicsEngine {
-    pub fn step(&mut self) {
-        self.pipeline.step(
-            &self.state.gravity,
-            &self.state.integration_parameters,
-            &mut self.state.islands,
-            &mut self.state.broad_phase,
-            &mut self.state.narrow_phase,
-            &mut self.state.bodies,
-            &mut self.state.colliders,
-            &mut self.state.joints,
-            &mut self.state.multibody_joints,
-            &mut self.state.ccd_solver,
-            Some(&mut self.state.query_pipeline),
-            &(),
-            &(),
-        )
-    }
-}

src/main.rs

@@ -1,168 +1,44 @@
-mod drawable;
-mod engine;
-
-use drawable::DrawShape;
-use engine::{PhysicsEngine, PhysicsState};
-
-use nalgebra::vector;
-use nannou::prelude::*;
-use rapier2d::{
-    dynamics::{RigidBodyBuilder, RigidBodyHandle, RigidBodySet},
-    geometry::{ColliderBuilder, ColliderSet},
-};
-
-const WINDOW_WIDTH: u32 = 512;
-const WINDOW_HEIGHT: u32 = WINDOW_WIDTH;
-const PARTICLE_COUNT: u32 = 200;
-const PARTICLE_SIZE: f32 = 5.;
-
-struct Model {
-    // Store the window ID so we can refer to this specific window later if needed.
-    window: WindowId,
-    // particles: Vec<Particle>,
-    engine: PhysicsEngine,
-}
-
-fn random_vec_in_rect(boundary: &Rect) -> nalgebra::Vector2<f32> {
-    let x = random_range(-100., 100.);
-    let y = random_range(-150., boundary.top());
-
-    vector![x, y]
-}
-
-fn fill_particles(boundary: &Rect, colliders: &mut ColliderSet, bodies: &mut RigidBodySet) {
-    // Keeping track of already placed balls to avoid overlap
-    // Need to look into a way to do this with rapier directly
-    let mut positions: Vec<nalgebra::Vector2<f32>> = Vec::new();
-
-    for _ in 0..PARTICLE_COUNT {
-        let mut xy = random_vec_in_rect(boundary);
-        while !positions
-            .iter()
-            .all(|pos| pos.metric_distance(&xy) > PARTICLE_SIZE * 2.)
-        {
-            xy = random_vec_in_rect(boundary)
-        }
-        positions.push(xy);
-
-        /* Create the bouncing ball. */
-        let rigid_body = RigidBodyBuilder::dynamic().translation(xy).build();
-        let collider = ColliderBuilder::ball(PARTICLE_SIZE)
-            .restitution(0.1)
-            .build();
-        let ball_body_handle = bodies.insert(rigid_body);
-        colliders.insert_with_parent(collider, ball_body_handle, bodies);
-    }
-}
-
-fn model(app: &App) -> Model {
-    // One thing that tripped me up when begginning nannou was realizing
-    // that view and event methods are per window, and update functions are
-    // per app
-
-    // Create a new window! Store the ID so we can refer to it later.
-    let window = app
-        .new_window()
-        .size(WINDOW_WIDTH, WINDOW_HEIGHT)
-        .title("nannou")
-        .view(view) // The function that will be called for presenting graphics to a frame.
-        .event(event) // The function that will be called when the window receives events.
-        .build()
-        .unwrap();
-
-    let mut engine = PhysicsEngine {
-        state: PhysicsState {
-            gravity: vector![0., -9.81 * 10.],
-            ..Default::default()
-        },
-        ..Default::default()
-    };
-
-    let boundary = app.window(window).unwrap().rect();
-
-    /* Create the ground. */
-    let collider = ColliderBuilder::cuboid(boundary.w(), 4.)
-        .translation(vector![0., boundary.bottom()])
-        .build();
-    engine.state.colliders.insert(collider);
-
-    /* Create the walls. */
-    let collider = ColliderBuilder::cuboid(4., boundary.h())
-        .translation(vector![boundary.left(), 0.])
-        .build();
-    engine.state.colliders.insert(collider);
-    let collider = ColliderBuilder::cuboid(4., boundary.h())
-        .translation(vector![boundary.right(), 0.])
-        .build();
-    engine.state.colliders.insert(collider);
-
-    /* Create the ceiling. */
-    let collider = ColliderBuilder::cuboid(boundary.w(), 4.)
-        .translation(vector![0., boundary.top()])
-        .build();
-    engine.state.colliders.insert(collider);
-
-    fill_particles(
-        &boundary,
-        &mut engine.state.colliders,
-        &mut engine.state.bodies,
-    );
-
-    Model { window, engine }
-}
-
-// Handle events related to the window and update the model if necessary
-fn event(app: &App, model: &mut Model, event: WindowEvent) {
-    if let KeyReleased(Key::Escape) = event {
-        app.quit()
-    }
-
-    if let Resized(_) = event {
-        // Rust borrowing rules means I need to first gather a list of handles,
-        // then delete them all
-        let handles: Vec<RigidBodyHandle> = model
-            .engine
-            .state
-            .bodies
-            .iter()
-            .map(|(handle, _)| handle)
-            .collect();
-
-        for handle in handles {
-            model.engine.state.bodies.remove(
-                handle,
-                &mut model.engine.state.islands,
-                &mut model.engine.state.colliders,
-                &mut model.engine.state.joints,
-                &mut model.engine.state.multibody_joints,
-                true,
-            );
-        }
-
-        fill_particles(
-            &app.window(model.window).unwrap().rect(),
-            &mut model.engine.state.colliders,
-            &mut model.engine.state.bodies,
-        );
-    }
-}
-
-// Update the state of your application here. By default, this gets called right before `view`.
-fn update(_app: &App, model: &mut Model, _update: Update) {
-    model.engine.step();
-}
-
-// Draw the state of your `Model` into the given `Frame` here.
-fn view(app: &App, model: &Model, frame: Frame) {
-    let canvas = app.draw();
-    canvas.background().color(CORNFLOWERBLUE);
-
-    canvas.draw(&model.engine.state.colliders);
-
-    // I don't think there is even a fail condition in this function, but it returns a result?
-    canvas.to_frame(app, &frame).unwrap();
-}
+use bevy::prelude::*;
+use bevy_rapier2d::prelude::*;
 
 fn main() {
-    nannou::app(model).update(update).run();
+    App::new()
+        .add_plugins(DefaultPlugins)
+        .add_plugins(RapierPhysicsPlugin::<NoUserData>::pixels_per_meter(100.0))
+        .add_plugins(RapierDebugRenderPlugin::default())
+        .add_systems(Startup, setup_graphics)
+        .add_systems(Startup, setup_physics)
+        .add_systems(Update, print_ball_altitude)
+        .run();
+}
+
+fn setup_graphics(mut commands: Commands) {
+    // Add a camera so we can see the debug-render.
+    commands.spawn(Camera2dBundle::default());
+}
+
+fn setup_physics(mut commands: Commands) {
+    /* Create the ground. */
+    commands
+        .spawn(Collider::cuboid(500.0, 50.0))
+        .insert(TransformBundle::from(Transform::from_xyz(0.0, -100.0, 0.0)));
+
+    /* Create the bouncing ball. */
+    commands
+        .spawn(RigidBody::Dynamic)
+        .insert(Collider::ball(10.0))
+        .insert(Restitution::coefficient(2.0))
+        .insert(TransformBundle::from(Transform::from_xyz(0.0, 400.0, 0.0)));
+
+    commands
+        .spawn(RigidBody::Dynamic)
+        .insert(Collider::ball(10.0))
+        .insert(Restitution::coefficient(2.0))
+        .insert(TransformBundle::from(Transform::from_xyz(0.0, 600.0, 0.0)));
+}
+
+fn print_ball_altitude(positions: Query<&Transform, With<RigidBody>>) {
+    for transform in positions.iter() {
+        println!("Ball altitude: {}", transform.translation.y);
+    }
 }