From 8989341714c1cdf4baceb22a10574016d29599d4 Mon Sep 17 00:00:00 2001
From: LordBaryhobal <lordbaryhobal@gmail.com>
Date: Sat, 18 Oct 2025 22:06:19 +0200
Subject: [PATCH] feat: add delta time

---
 src/car.py  | 29 ++++++++++++++++++-----------
 src/game.py |  3 ++-
 2 files changed, 20 insertions(+), 12 deletions(-)

diff --git a/src/car.py b/src/car.py
index 79e8a67..21f664f 100644
--- a/src/car.py
+++ b/src/car.py
@@ -7,14 +7,19 @@ from src.utils import segments_intersect
 from src.vec import Vec
 
 
+sign = lambda x: 0 if x == 0 else (-1 if x < 0 else 1)
+
+
 class Car:
-    MAX_SPEED = 0.05
-    MAX_BACK_SPEED = -0.025
-    ROTATE_SPEED = radians(1)
+    MAX_SPEED = 5
+    MAX_BACK_SPEED = -2
+    ROTATE_SPEED = 1
     COLOR = (230, 150, 80)
     WIDTH = 0.4
     LENGTH = 0.6
     COLLISION_MARGIN = 0.4
+    ACCELERATION = 2
+    FRICTION = 3
 
     def __init__(self, pos: Vec, direction: Vec) -> None:
         self.pos: Vec = pos
@@ -26,20 +31,20 @@ class Car:
         self.right: bool = False
         self.colliding: bool = False
 
-    def update(self):
+    def update(self, dt: float):
         if self.forward:
-            self.speed += 0.001
+            self.speed += self.ACCELERATION * dt
             self.speed = min(self.MAX_SPEED, self.speed)
 
         if self.backward:
-            self.speed -= 0.002
+            self.speed -= self.ACCELERATION * 2 * dt
             self.speed = max(self.MAX_BACK_SPEED, self.speed)
 
         rotate_angle: float = 0
         if self.left:
-            rotate_angle -= self.ROTATE_SPEED
+            rotate_angle -= self.ROTATE_SPEED * dt
         if self.right:
-            rotate_angle += self.ROTATE_SPEED
+            rotate_angle += self.ROTATE_SPEED * dt
 
         # if self.backward:
         #    rotate_angle *= -1
@@ -47,11 +52,13 @@ class Car:
         if rotate_angle != 0:
             self.direction = self.direction.rotate(rotate_angle)
 
-        self.speed *= 0.98
-        if abs(self.speed) < 1e-8:
+        if not self.forward and not self.backward:
+            self.speed -= sign(self.speed) * self.FRICTION * dt
+
+        if abs(self.speed) < 1e-4:
             self.speed = 0
 
-        self.pos += self.direction * self.speed
+        self.pos += self.direction * self.speed * dt
 
     def render(self, surf: pygame.Surface, camera: Camera):
         pts: list[Vec] = self.get_corners()
diff --git a/src/game.py b/src/game.py
index 6cc4a1e..2d3c910 100644
--- a/src/game.py
+++ b/src/game.py
@@ -34,8 +34,9 @@ class Game:
 
     def mainloop(self):
         while self.running:
+            dt: float = self.clock.get_time() / 1000
             self.process_pygame_events()
-            self.car.update()
+            self.car.update(dt)
             self.car.check_collisions(self.track.get_collision_polygons())
             self.render()
             self.clock.tick(60)