Question

我正试图在pygame中制作一把剑“摇摆”。我或多或少地使用这样的方法。

def animate(self):
    self.image1 = pg.Surface((40, 30))
    self.image1.fill(255,0,0)

    self.image2 = pg.Surface((60, 20))
    self.image2.fill(0,0,255)

    self.image = self.image1
    #not the real images, but you get the point

    now = pg.time.get_ticks()
    keys = pg.key.get_pressed()

    if keys[pg.K_l] or keys[pg.K_j]:
        self.slashing = True
    else:
        self.slashing = False
    #player image starts out as self.image1
    if self.slashing:
        self.image = self.image2
        if now - self.last_slash > 750:
            self.last_slash = now
            self.image = self.image1

它正在交换图像2，但是我的计时器并没有像我希望的那样带回图像。它只是像image2一样。

Answer 1

如果您只想切换两张图像，可以执行以下操作：当用户斜杠时，将self.image设置为第二张剑图像，当时间到了或用户释放密钥时，重置self.image到第一张剑形象。我认为在这种情况下使用事件循环并在类中处理事件会更容易。

import pygame as pg


# Two sword images.
SWORD_IMG1 = pg.Surface((140, 140), pg.SRCALPHA)
pg.draw.polygon(
    SWORD_IMG1, pg.Color('lightskyblue1'),
    ((70, 0), (76, 10), (76, 70), (64, 70), (64, 10)))
SWORD_IMG2 = pg.transform.rotozoom(SWORD_IMG1, -90, 1)


class Sword(pg.sprite.Sprite):

    def __init__(self, pos, *groups):
        super().__init__(*groups)
        self.image = SWORD_IMG1
        self.rect = self.image.get_rect(center=pos)
        self.slashing = False
        self.last_slash = None

    def handle_event(self, event):
        if event.type == pg.KEYDOWN:
            if event.key in (pg.K_j, pg.K_l):
                if not self.slashing:
                    # Start the slashing animation.
                    self.image = SWORD_IMG2  # Set the image.
                    self.slashing = True      
                    self.last_slash = pg.time.get_ticks()
        elif event.type == pg.KEYUP:
            if event.key in (pg.K_j, pg.K_l):
                # Reset the image.
                self.image = SWORD_IMG1
                self.slashing = False

    def update(self):
        # The update method gets called once each frame.
        if self.slashing:
            self.animate()

    def animate(self):
        now = pg.time.get_ticks()
        if now - self.last_slash > 750:
            # When the anim is done, reset the image.
            self.image = SWORD_IMG1
            self.slashing = False


def main():
    screen = pg.display.set_mode((640, 480))
    clock = pg.time.Clock()
    all_sprites = pg.sprite.Group()
    sword = Sword((100, 300), all_sprites)

    done = False

    while not done:
        for event in pg.event.get():
            if event.type == pg.QUIT:
                done = True
            sword.handle_event(event)

        all_sprites.update()
        screen.fill((30, 30, 30))
        all_sprites.draw(screen)

        pg.display.flip()
        clock.tick(30)


if __name__ == '__main__':
    pg.init()
    main()
    pg.quit()

为什么我的图像没有交换回来？

1 个答案: