Increment a frame of the animation.

def increment_frame(self):
        """Increment a frame of the animation."""
        if self.current_frame < len(self.images):
            self.current_frame += 1

            if self.current_frame >= len(self.images):
                # Wrap back to the beginning of the animation if should_repeat is true.
                if self.should_repeat:
                    self.current_frame = 0
                else:
                    # Clamp the current frame to the number of images we have in our list
                    self.current_frame = len(self.images) - 1

            # Set the image that is currently displaying.
            if self.current_frame < len(self.images):
                self.image = self.images[self.current_frame]
                self.image.coords = self.coords