From 8d822448f8a66a47e5df2e170f646d51d6173c70 Mon Sep 17 00:00:00 2001
From: Zynh0722 <Zynh0722@gmail.com>
Date: Sat, 17 Feb 2024 00:37:07 -0800
Subject: [PATCH] emulate old reset behaviour

---
 src/main.rs     | 35 ++++++++++++++++++++++++++++-------
 src/particle.rs | 43 -------------------------------------------
 2 files changed, 28 insertions(+), 50 deletions(-)
 delete mode 100644 src/particle.rs

diff --git a/src/main.rs b/src/main.rs
index d5b083c..d392aac 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -8,7 +8,7 @@ use engine::{PhysicsEngine, PhysicsState};
 use nalgebra::vector;
 use nannou::prelude::*;
 use rapier2d::{
-    dynamics::{RigidBodyBuilder, RigidBodySet},
+    dynamics::{RigidBodyBuilder, RigidBodyHandle, RigidBodySet},
     geometry::{ColliderBuilder, ColliderSet},
 };
 
@@ -82,16 +82,37 @@ fn model(app: &App) -> Model {
 }
 
 // Handle events related to the window and update the model if necessary
-fn event(app: &App, _model: &mut Model, event: WindowEvent) {
+fn event(app: &App, model: &mut Model, event: WindowEvent) {
     if let KeyReleased(Key::Escape) = event {
         app.quit()
     }
 
-    // if let Resized(_) = event {
-    //     model.particles.clear();
-    //
-    //     fill_particles(app, &mut model.particles);
-    // }
+    if let Resized(_) = event {
+        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,
+            &mut model.engine.state.colliders,
+            &mut model.engine.state.bodies,
+        );
+    }
 
     // println!("{:?}", event);
 }
diff --git a/src/particle.rs b/src/particle.rs
deleted file mode 100644
index 9dd208e..0000000
--- a/src/particle.rs
+++ /dev/null
@@ -1,43 +0,0 @@
-use crate::drawable::Drawable;
-use crate::PARTICLE_SIZE;
-
-use nannou::prelude::*;
-
-#[derive(Debug)]
-pub struct Particle {
-    pub pos: Vec2,
-    pub start_pos: Vec2,
-    pub radius: f32,
-    pub time_offset: f32,
-}
-
-impl Particle {
-    pub fn new(pos: Vec2) -> Self {
-        Self {
-            pos,
-            start_pos: pos,
-            ..Default::default()
-        }
-    }
-}
-
-impl Default for Particle {
-    fn default() -> Self {
-        Self {
-            pos: Default::default(),
-            radius: PARTICLE_SIZE,
-            start_pos: Default::default(),
-            time_offset: random_range(-PI, PI),
-        }
-    }
-}
-
-impl Drawable for Particle {
-    fn draw(&self, draw: &Draw) {
-        draw.ellipse()
-            .color(RED)
-            .stroke_weight(1.0)
-            .radius(self.radius)
-            .xy(self.pos);
-    }
-}