Pygame collision with masks

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The offset parameter of the method overlap() is the relative position of the othermask in relation to the pygame.mask.Mask object.
So the offset is calculated by subtracting the coordinates of slant from the coordinates of ball:

offset_x, offset_y = (slant.rect.x - ball.rect.x), (slant.rect.y - ball.rect.y)

offset = (ball.rect.x - slant.rect.x), (ball.rect.y - slant.rect.y)
if slant.mask.overlap(ball.mask, offset):
    print("hit")

When you create the mask images, then I recommend to ensure that the image has per pixel alpha format by calling .convert_alpha():

class Ball:

    def __init__(self, x, y):
        self.x = x
        self.y = y

        self.image = pygame.image.load("sball.png")
        self.rect = self.image.get_rect()
        self.mask = pygame.mask.from_surface(self.image.convert_alpha()) # <---

class Slant:

    def __init__(self, x, y):
        self.x = x
        self.y = y

        self.image = pygame.image.load("posslant.png")
        self.rect = self.image.get_rect()
        self.mask = pygame.mask.from_surface(self.image.image.convert_alpha()) # <---

Minimal example: repl.it/@Rabbid76/PyGame-SurfaceMaskIntersect

See also: Mask

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