bird.py

import pygame
import os

BIRD_IMGS = [pygame.image.load(os.path.join("imgs","bird1.png")),
            pygame.image.load(os.path.join("imgs","bird2.png")),
            pygame.image.load(os.path.join("imgs","bird3.png"))]

BIRD_IMGS = [pygame.transform.scale2x(x) for x in BIRD_IMGS]

class Bird:
    IMGS = BIRD_IMGS
    MAX_ROTATION = 25
    ROT_VEL = 20
    ANIMATION_TIME = 5

    def __init__(self, x, y):
        self.x = x
        self.y = y
        self.tilt = 0
        self.tick_count = 0
        self.vel = 0
        self.height = self.y
        self.image_count = 0
        self.img = self.IMGS[0]

    def jump(self):
        self.vel = -10.5
        self.tick_count = 0
        self.height = self.y

    def move(self):
        self.tick_count = self.tick_count + 1
        d = self.vel*self.tick_count + 1.5*self.tick_count**2
        
        if d >= 16:
            d = 16
        
        if d < 0:
            d = d - 2

        self.y = self.y + d

        if d < 0 or self.y < self.height + 50:
            if self.tilt < self.MAX_ROTATION:
                self.tilt = self.MAX_ROTATION
        
        else:
            if self.tilt > -90:
                self.tilt = self.tilt - self.ROT_VEL
    
    def draw(self, win):
        self.image_count = self.image_count + 1

        if self.image_count < self.ANIMATION_TIME :
            self.img = self.IMGS[0]
        elif self.image_count < self.ANIMATION_TIME*2:
            self.img = self.IMGS[1]
        elif self.image_count < self.ANIMATION_TIME*3:
            self.img = self.IMGS[2]
        elif self.image_count < self.ANIMATION_TIME*4:
            self.img = self.IMGS[1]
        elif self.image_count == self.ANIMATION_TIME*4+1:
            self.img = self.IMGS[0]
            self.image_count = 0

        if self.tilt < -80:
            self.img = self.IMGS[1]
            self.image_count = self.ANIMATION_TIME*2
        

        rotated_image = pygame.transform.rotate(self.img, self.tilt)
        new_rect = rotated_image.get_rect(center=self.img.get_rect(topleft = (self.x, self.y)).center)
        win.blit(rotated_image, new_rect.topleft)

    def get_mask(self):
        return pygame.mask.from_surface(self.img)

    def hasFallen(self):
        return self.y + self.img.get_height() >= 730