From 02750384df3142bda62a7ce0feb08d115aa6af29 Mon Sep 17 00:00:00 2001
From: Alexander Foremny <aforemny@posteo.de>
Date: Thu, 14 Mar 2024 14:24:43 +0100
Subject: feat: walking

---
 src/server.rs | 34 +++++++++++++++++++++++++++++-----
 1 file changed, 29 insertions(+), 5 deletions(-)

(limited to 'src/server.rs')

diff --git a/src/server.rs b/src/server.rs
index 3a7dd40..188aad1 100644
--- a/src/server.rs
+++ b/src/server.rs
@@ -1,5 +1,6 @@
 use crate::protocol::*;
 use crate::server::network::*;
+use crate::shared::imperative::*;
 use crate::shared::*;
 use bevy::prelude::*;
 use bevy::utils::HashMap;
@@ -29,7 +30,8 @@ impl Plugin for ServerPlugin {
                 transport: self.transport.clone(),
             })
             .add_systems(Update, connections)
-            .add_systems(FixedUpdate, player_input);
+            .add_systems(FixedUpdate, player_input)
+            .add_systems(Update, imperative);
     }
 }
 
@@ -63,16 +65,16 @@ fn connections(
 fn player_input(
     entity_map: Res<EntityMap>,
     mut input_reader: EventReader<server::InputEvent<Inputs>>,
-    mut positions: Query<&mut PlayerPosition>,
+    mut imperatives: Query<&mut Imperative>,
 ) {
     for input in input_reader.read() {
         let client_id = input.context();
         if let Some(input) = input.input() {
             if let Some(entity_id) = entity_map.0.get(client_id) {
                 match input {
-                    Inputs::Teleport(new_position) => {
-                        if let Ok(mut position) = positions.get_mut(*entity_id) {
-                            position.0 = *new_position;
+                    Inputs::Imperative(new_imperative) => {
+                        if let Ok(mut imperative) = imperatives.get_mut(*entity_id) {
+                            *imperative = *new_imperative;
                         }
                     }
                     _ => {}
@@ -81,3 +83,25 @@ fn player_input(
         }
     }
 }
+
+const MOVEMENT_SPEED: f32 = 80.;
+
+fn imperative(mut players: Query<(&mut Imperative, &mut PlayerPosition)>, time: Res<Time>) {
+    for (mut imperative, mut position) in players.iter_mut() {
+        match *imperative {
+            Imperative::Idle => {}
+            Imperative::WalkTo(target) => {
+                let distance = (target - position.0).length();
+                let direction = (target - position.0).normalize_or_zero();
+                let new_position = position.0
+                    + f32::min(MOVEMENT_SPEED * time.delta().as_secs_f32(), distance) * direction;
+                if position.0.distance(new_position) < f32::EPSILON {
+                    position.0 = target;
+                    *imperative = Imperative::Idle;
+                } else {
+                    position.0 = new_position;
+                }
+            }
+        }
+    }
+}
-- 
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