Question

I’m trying to use collision detection to detect when my mouse hits an image that I’ve imported. I get the error “tuple does not have attribute rect”

 def main():


    #Call the SDL arg to center the window when it's inited, and then init pygame
    os.environ["SDL_VIDEO_CENTERED"] = "1"
    pygame.init()

    #Set up the pygame window
    screen = pygame.display.set_mode((600,600))


    image_one = pygame.image.load("onefinger.jpg").convert()

    screen.fill((255, 255, 255))
    screen.blit(image_one, (225,400))
    pygame.display.flip()

    while 1:
        mousecoords = pygame.mouse.get_pos() 
        left = (mousecoords[0], mousecoords[1], 10, 10)
        right = image_one.get_bounding_rect()
        if pygame.sprite.collide_rect((left[0]+255, left[1]+400, left[2], left[3]), right):
            print('Hi')

Answer 1

The problem is that pygame.sprite.collide_rect() takes two Sprite objects. You are passing it two tuples – neither the cursor nor the image are Sprites and so lack a rect attribute.

You could make a Sprite using image_one, but it will be more tricky to convert the cursor into a Sprite. I think it would be easier to manually test whether the cursor is within the image.

#Set up the pygame window
screen = pygame.display.set_mode((200,200))
screen.fill((255, 255, 255))

#Set up image properties (would be better to make an object)
image_one = pygame.image.load("image_one.png").convert()
image_x = 225
image_y = 400
image_width = image_one.get_width()
image_height = image_one.get_height()

# Mouse properties
mouse_width = 10
mouse_height = 10

screen.blit(image_one, (image_x, image_y))
pygame.display.flip()

while 1:
    for event in pygame.event.get():
        if event.type == pygame.MOUSEMOTION:
            mouse_x, mouse_y = pygame.mouse.get_pos()

            # Test for 'collision'
            if image_x - mouse_width < mouse_x < image_x + image_width and image_y - mouse_height < mouse_y < image_y + image_height:
                print 'Hi!'

Notice that I test whether the mouse has moved before testing whether it’s in the image, to avoid repeating the calculation needlessly.