Image rotation while moving

Question

Hello I am here because I have a problem, I am learning pygame but my game cannot changes rotation while moving.

Using a vector didn\'t help.

Answer 1

Store the original (not rotated) image in the class and store the position of the car in a pygame.math.Vector2 object:

def __init__(self, surf, x, y, speed, angle):
    # [...]
    self.surf = surf.convert()
    self.surf.set_colorkey(black)
    self.pos = pygame.math.Vector2(x, y)
    # [...]

Chang the position of the car dependent on the direction. The direction vector is set by self.speed (in y direction) and has to be rotated by self.angle. Note that (.rotate()) rotates in counter clockwise direction. The y-axis points downwards, so when w is pressed, then the vector has to be subtracted and when s is pressed, then the vector has to be add to self.pos:

def update(self):
 
    # [...]

    dirvec = pygame.math.Vector2(0, self.speed).rotate(self.angle)

    if keys[pygame.K_w]:
        self.pos = self.pos - dirvec
    elif keys[pygame.K_s]:
        self.pos = self.pos + dirvec

Rotate the image and update the rectangle. See also How do I rotate an image around its center using Pygame?:

def update(self):

    # [...]

    self.image = pygame.transform.rotate(self.surf, -self.angle)
    self.rect  = self.image.get_rect(center = (round(self.pos.x), round(self.pos.y)))

---

Full code of the class Car:

class Car(pygame.sprite.Sprite):
    def __init__(self, surf, x, y, speed, angle):
        super().__init__()     
        self.surf = surf
        self.surf.set_colorkey(black)
        self.pos = pygame.math.Vector2(x, y)
        self.angle = angle
        self.speed = speed
        self.image = pygame.transform.rotate(self.surf, self.angle)
        self.rect  = self.image.get_rect(center=(x, y))

    def update(self):

        keys = pygame.key.get_pressed()
        if keys[pygame.K_a]:
            self.angle -= 10
        elif keys[pygame.K_d]:
            self.angle += 10

        dirvec = pygame.math.Vector2(0, self.speed).rotate(self.angle)
        if keys[pygame.K_w]:
            self.pos = self.pos - dirvec
        elif keys[pygame.K_s]:
            self.pos = self.pos + dirvec

        if self.pos.x > 800:
            self.pos.x = 0
        elif self.pos.x < 0:
            self.pos.x = 800
        elif self.pos.y > 600:
            self.pos.y = 0
        elif self.pos.y < 0:
            self.pos.y = 600

        self.image = pygame.transform.rotate(self.surf, -self.angle)
        self.rect  = self.image.get_rect(center = (round(self.pos.x), round(self.pos.y)))

---

See also How to turn the sprite in pygame while moving with the keys

repl.it/@Rabbid76/PyGame-CarMovement

Answer 2

Make these bits:

elif keys[pygame.K_a]
elif keys[pygame.K_d]

Into:

if keys[pygame.K_a]
elif keys[pygame.K_d]

That should do it.