.

input.py

@@ -3,7 +3,7 @@ import pygame
 class Input:
     def __init__(self):
         self.left: bool = False
-        self.right: bool = True
+        self.right: bool = False
         self.down: bool = False
         self.up: bool = False
         self.close: bool = False
@@ -24,13 +24,13 @@ class Input:
                     self.down = True
             if event.type == pygame.KEYUP:
                 if event.key == pygame.K_LEFT:
-                    self.left = True
+                    self.left = False
                 if event.key == pygame.K_RIGHT:
-                    self.right = True
+                    self.right = False
                 if event.key == pygame.K_UP:
-                    self.up = True
+                    self.up = False
                 if event.key == pygame.K_DOWN:
-                    self.down = True
+                    self.down = False
 
     def horizontal(self) -> float:
         return self.right - self.left

kart.py

@@ -23,11 +23,12 @@ class Kart:
     def tick(self, input: Input):
         input_x = input.horizontal()
         input_y = input.vertical()
-        assert abs(input_x) < 1
+        assert abs(input_x) <= 1
-        assert abs(input_y) < 1
+        assert abs(input_y) <= 1
 
         acc_amount = input_y * 2
         self.vel += Vec2(acc_amount, 0).rotate(self.dir)
+        self.vel *= 0.9
         steer = input_x * 2
         self.dir += steer
 
@@ -44,8 +45,8 @@ class Kart:
 
     def consume_item(self, item: Item):
         if item.kind == items.ITEM_BANANA:
-            self.speed_max += 1
+            self.speed_max += 0.01
         elif item.kind == items.ITEM_BANANA:
-            self.speed_max -= 1
+            self.speed_max -= 0.01
 
         self.speed_max = clamp(self.speed_max, 0, 100)

main.py

@@ -5,14 +5,18 @@ from kart import Kart
 
 Vec2 = pygame.Vector2
 
+kart_image = pygame.surface.Surface((10, 10))
+
 player = Kart(
     name = "epsilon",
     pos = Vec2(0, 0),
     vel = Vec2(2, 0),
     dir = 0,
-    speed_max = 10,
+    speed_max = 3,
 )
 
+clock = pygame.Clock()
+
 def main():
     pygame.init()
 
@@ -21,8 +25,30 @@ def main():
     screen = pygame.display.set_mode((width, height))
     pygame.display.set_caption("Pygame Window Example")
 
+    kart = Kart(
+        name = "jerry",
+        pos = Vec2(0.0, 0.0),
+        vel = Vec2(0.0, 0.0),
+        dir = 0.0,
+        speed_max = 10.0
+    )
+
+
     while not input.close:
         input.poll()
+        kart.tick(input)
+
+        # Draw game:
+        screen.fill((0, 125, 0))
+        pygame.draw.rect(screen, (255, 0, 0), pygame.Rect(kart.pos.x - 5, kart.pos.y - 5, 5, 5))
+        pygame.draw.line(screen, (0, 0, 0), kart.pos, kart.pos + Vec2(100, 0).rotate(kart.dir))
+
+        pygame.draw.rect(screen, (0, 0, 255), pygame.Rect(kart.pos.x - 5, kart.pos.y - 5, 5, 5))
+        pygame.draw.line(screen, (0, 0, 0), kart.pos, kart.pos + Vec2(100, 0).rotate(kart.dir))
+
+        pygame.display.flip()
+
+        clock.tick(60)
 
 
 if __name__ == "__main__":