From e5f9409fd80ca978339f534334d3879882145c61 Mon Sep 17 00:00:00 2001
From: yuni <hut@hut.pm>
Date: Sat, 13 Jul 2024 14:30:02 +0200
Subject: [PATCH] automatically match velocity to the closest object

---
 src/camera.rs | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/src/camera.rs b/src/camera.rs
index e8aa821..472bd14 100644
--- a/src/camera.rs
+++ b/src/camera.rs
@@ -25,6 +25,7 @@ use bevy_xpbd_3d::prelude::*;
 use std::collections::HashMap;
 
 pub const INITIAL_ZOOM_LEVEL: f64 = 10.0;
+pub const MAX_DIST_FOR_MATCH_VELOCITY: f64 = 10000.0;
 
 pub struct CameraPlugin;
 
@@ -422,6 +423,7 @@ pub fn apply_input_to_player(
     key_input: Res<ButtonInput<KeyCode>>,
     q_audiosinks: Query<(&audio::Sfx, &AudioSink)>,
     q_target: Query<&LinearVelocity, (With<hud::IsTargeted>, Without<actor::PlayerCamera>)>,
+    q_closest: Query<(&Position, &LinearVelocity), (Without<hud::IsTargeted>, Without<actor::PlayerCamera>)>,
     mut q_playercam: Query<
         (
             Entity,
@@ -459,8 +461,21 @@ pub fn apply_input_to_player(
         let target_v: DVec3 = if let Ok(target) = q_target.get_single() {
             target.0
         } else {
-            let relative_pos = pos.0 - jupiter_pos.0;
-            nature::orbital_velocity(relative_pos, nature::JUPITER_MASS)
+            let mut closest_distance = MAX_DIST_FOR_MATCH_VELOCITY;
+            let mut closest_velocity = None;
+            for (testpos, v) in q_closest.iter() {
+                let distance = (pos.0 - testpos.0).length();
+                if distance < closest_distance {
+                    closest_velocity = Some(v);
+                    closest_distance = distance;
+                }
+            }
+            if closest_velocity.is_some() {
+                closest_velocity.unwrap().0
+            } else {
+                let relative_pos = pos.0 - jupiter_pos.0;
+                nature::orbital_velocity(relative_pos, nature::JUPITER_MASS)
+            }
         };
         // Handle key input
         if focused {