如何让我的行走动画以设定的速度播放?(Python，Pygame) [英] How do I make it so that my walking animation plays at a set speed? (Python, Pygame)

问题描述

keystate = pg.key.get_pressed()
        if keystate[pg.K_LEFT]:
            self.counter = (self.counter + 1) % len(player_images)
            self.acc.x = -PLAYER_ACC
            self.image = pg.transform.flip(player_images[self.counter], True, False)
            self.image.set_colorkey(WHITE)

这是我的代码.如何在不改变 FPS 的情况下将其创建到步行动画播放速度较慢的位置?

Here is my code. How do I create it to where the walking animation will player slower without change the FPS?

推荐答案

你需要跟踪时间，所以你可以使用 pygame.time.get_ticks 或 的时间clock.tick() 返回(通常称为 dt 表示增量时间)，然后在经过一段时间后更新图像.

You need to keep track of the time, so you can either use pygame.time.get_ticks or the time that clock.tick() returns (it's usually called dt for delta time) and then update the image after some time has passed.

pygame.time.get_ticks 变体:

class Player(pg.sprite.Sprite):

    def __init__(self, pos, *groups):
        super().__init__(*groups)
        self.frame = 0  # Index of the current animation frame.
        self.image = IMAGES[self.frame]  # Set image to the first image.
        self.rect = self.image.get_rect(center=pos)
        # Start time of the last animation frame.
        self.start_time = pg.time.get_ticks()
        # If the time limit is reached, increment the index
        # and change self.image.
        self.time_limit = 300  # Milliseconds.

    def update(self):
        now = pg.time.get_ticks()
        if now - self.start_time > self.time_limit:
            self.frame += 1  # Increment the frame index.
            self.frame %= len(IMAGES)  # Keep the index in the range.
            self.image = IMAGES[self.frame]  # Switch the image.
            self.start_time = now

以及带有 delta time 变体的完整示例.(如果您最终想让游戏帧速率独立，则无论如何您都需要在类中使用 dt 来提高移动速度.

And a complete example with the delta time variant. (You'll need the dt in your class anyway for the movement speed, if you eventually want to make the game frame rate independent).

import pygame as pg


# Some images with dots for the animation.
IMAGE1 = pg.Surface((90, 90))
IMAGE1.fill((30, 90, 200))
pg.draw.circle(IMAGE1, (50, 170, 220), (45, 45), 15)
IMAGE2 = pg.Surface((90, 90))
IMAGE2.fill((30, 90, 200))
pg.draw.circle(IMAGE2, (50, 170, 220), (30, 30), 15)
pg.draw.circle(IMAGE2, (50, 170, 220), (60, 60), 15)
IMAGE3 = pg.Surface((90, 90))
IMAGE3.fill((30, 90, 200))
pg.draw.circle(IMAGE3, (50, 170, 220), (20, 20), 15)
pg.draw.circle(IMAGE3, (50, 170, 220), (45, 45), 15)
pg.draw.circle(IMAGE3, (50, 170, 220), (70, 70), 15)
IMAGES = [IMAGE1, IMAGE2, IMAGE3]


class Entity(pg.sprite.Sprite):

    def __init__(self, pos, *groups):
        super().__init__(*groups)
        self.frame = 0  # Index of the current animation frame.
        self.image = IMAGES[self.frame]  # Set image to the first image.
        self.rect = self.image.get_rect(center=pos)
        self.timer = 0  # Time in seconds.

    def update(self, dt):
        self.timer += dt  # Increment the timer.
        # If the timer is above the desired time limit ...
        if self.timer >= .5:
            self.timer = 0  # Reset the timer.
            self.frame += 1  # Increment the frame index.
            self.frame %= len(IMAGES)  # Keep the index in the range.
            self.image = IMAGES[self.frame]  # Switch the image.


def main():
    screen = pg.display.set_mode((640, 480))
    clock = pg.time.Clock()
    all_sprites = pg.sprite.Group(Entity((200, 200)))
    dt = 0
    done = False

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

        # Pass dt to the update methods of all sprites.
        all_sprites.update(dt)
        screen.fill((30, 30, 30))
        all_sprites.draw(screen)

        pg.display.flip()
        # dt is the time that has passed since the last clock.tick call.
        # Divide by 1000 to convert milliseconds to seconds.
        dt = clock.tick(30) / 1000


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

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