From a8e792fe129901193258b8db298de9148426b45c Mon Sep 17 00:00:00 2001
From: metamuffin <metamuffin@disroot.org>
Date: Sun, 6 Apr 2025 18:06:47 +0200
Subject: improve tram smoothing

---
 server/src/entity/mod.rs  | 16 +++++++++++++--
 server/src/entity/tram.rs | 50 ++++++++++++++++++-----------------------------
 2 files changed, 33 insertions(+), 33 deletions(-)

(limited to 'server')

diff --git a/server/src/entity/mod.rs b/server/src/entity/mod.rs
index 60f02d2a..ddafc2f7 100644
--- a/server/src/entity/mod.rs
+++ b/server/src/entity/mod.rs
@@ -1,6 +1,6 @@
 /*
     Hurry Curry! - a game about cooking
-    Copyright 2024 metamuffin
+    Copyright 2025 metamuffin
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU Affero General Public License as published by
@@ -139,6 +139,8 @@ pub enum EntityDecl {
         length: usize,
         character: Option<i32>,
         points: Vec<Vec2>,
+        spacing: f32,
+        smoothing: f32,
     },
     Book,
 }
@@ -209,6 +211,16 @@ pub fn construct_entity(
             length,
             character,
             points,
-        } => Box::new(Tram::new(character.unwrap_or(51), length, points)),
+            smoothing,
+            spacing,
+        } => Box::new(Tram {
+            length,
+            character: character.unwrap_or(51),
+            ids: Vec::new(),
+            points,
+            progress: 0.,
+            spacing,
+            smoothing,
+        }),
     })
 }
diff --git a/server/src/entity/tram.rs b/server/src/entity/tram.rs
index 27c3bcbb..5b7fcaa8 100644
--- a/server/src/entity/tram.rs
+++ b/server/src/entity/tram.rs
@@ -21,24 +21,15 @@ use hurrycurry_protocol::{glam::Vec2, PacketS, PlayerClass, PlayerID};
 use rand::random;
 
 pub struct Tram {
-    length: usize,
-    character: i32,
-    ids: Vec<PlayerID>,
-    points: Vec<Vec2>,
-    index: usize,
+    pub length: usize,
+    pub character: i32,
+    pub ids: Vec<PlayerID>,
+    pub points: Vec<Vec2>,
+    pub progress: f32,
+    pub spacing: f32,
+    pub smoothing: f32,
 }
 
-impl Tram {
-    pub fn new(character: i32, length: usize, points: Vec<Vec2>) -> Self {
-        Self {
-            character,
-            ids: Vec::new(),
-            length,
-            points,
-            index: 0,
-        }
-    }
-}
 impl Entity for Tram {
     fn finished(&self) -> bool {
         false
@@ -57,22 +48,19 @@ impl Entity for Tram {
             }
         }
 
-        let mut ppos = None;
-        for id in &self.ids {
-            if let Some(p) = c.game.players.get(id) {
-                let target = if let Some(pos) = ppos {
-                    pos
-                } else {
-                    let tar = self.points[self.index];
-                    if p.movement.position.distance(tar) < 2. {
-                        self.index += 1;
-                        self.index %= self.points.len();
-                    }
-                    tar
+        for (i, id) in self.ids.iter().enumerate() {
+            if let Some(player) = c.game.players.get(id) {
+                let t = self.progress + self.spacing * i as f32;
+                let i = t.trunc() as usize;
+                let p_a = self.points[i % self.points.len()];
+                let p_b = self.points[(i + 1) % self.points.len()];
+                let p = p_a.lerp(p_b, t.fract());
+                if p.distance(player.movement.position) < self.smoothing {
+                    self.progress += 0.1;
+                    self.progress %= self.points.len() as f32;
                 };
-                ppos = Some(p.movement.position);
-                let dir = if p.movement.position.distance(target) > 2. {
-                    target - p.movement.position
+                let dir = if player.movement.position.distance(p) > self.smoothing * 0.8 {
+                    p - player.movement.position
                 } else {
                     Vec2::ZERO
                 };
-- 
cgit v1.2.3-70-g09d2