import pygame
from pygame.locals import HWSURFACE, DOUBLEBUF
import math

FLAGS=  HWSURFACE | DOUBLEBUF #| FULLSCREEN

GX = 450
GY = 450
CELL_COLOR = (80,80,80)
CAR_SIZE=50
pygame.init()

IMG = pygame.image.load("car50.png")#.convert()

def angle_to_vector(angle):
    angle=angle*math.pi/180
    return [math.cos(angle), math.sin(angle)]

class Car(pygame.sprite.Sprite):
    def __init__(self):
        pygame.sprite.Sprite.__init__(self)
        self.surface = pygame.Surface((CAR_SIZE, CAR_SIZE))
        self.original_image = IMG
        # self.image = pygame.Surface((CAR_SIZE, CAR_SIZE))
        # self.image.fill((0,255,0))
        # self.original_image = self.image

        self.image = self.original_image

        self.rect = self.surface.get_rect()
        self.rect.center = (GX / 2, GY / 2)
        self.speed = 5
        self.heading = 0
        self.heading_change = 0


    # def draw(self,screen):
    #     # self.surface.blit(self.image, (0,0))
    #     screen.blit(self.surface, self.rect.center)

    def update_position(self):
        vec = angle_to_vector(self.heading)
        old_center = self.rect.center
        self.rect.center = (self.speed * vec[0] + old_center[0], self.speed * vec[1] + old_center[1])

    def update(self):

        # rotate
        old_center = self.rect.center
        self.image = pygame.transform.rotate(self.original_image, self.heading)
        self.rect = self.image.get_rect()
        self.rect.center = old_center
        # self.update_position()

        self.heading += self.heading_change
        self.heading = self.heading % 360
        # self.rect = self.image.get_rect(center=self.rect.center)
        self.rect.x += self.speed


screen = pygame.display.set_mode((GX, GY), FLAGS)
all_cars = pygame.sprite.Group()
car = Car()
all_cars.add(car)
car2 = Car()
car2.heading_change = 5
car2.speed = -2
all_cars.add(car2)


clock = pygame.time.Clock()
while True :
    screen.fill(CELL_COLOR)
    all_cars.update()
    all_cars.draw(screen)
    pygame.draw.rect(screen, (125,255,125),pygame.Rect(car2.rect.center, (3,3)))

    pygame.display.flip()
    clock.tick(10)