python-如何在pygame中使用操纵杆使精灵向上和向下移动

我正在尝试创建一个以前做过的项目,但是除了这段时间之外,我将使用学校免费提供的一个游戏机遥控器.当我上下移动操纵杆时,它会显示相同的坐标.(如果您不明白我的意思,那么请看下面的图片).然后我也不确定我需要在if语句中输入什么内容,以便它检查操纵杆是向上还是向下.我也很难考虑如何检查操纵杆是否没有方向.

我已经尝试使用if语句,如果操纵杆大于一个数字且小于另一个数字(第一个数字位于操纵杆的上半部分,另一个数字表示它位于操纵杆的下半部分)会向下移动.当前的if语句不会产生任何错误但不起作用.我尝试了if语句来检查它是否在中间,但我不太确定.

    joystick_count = pygame.joystick.get_count()
if joystick_count == 0:
    # No joysticks!
    print("Error, I didn't find any joysticks.")
else:
    # Use joystick #0 and initialize it
    joystick = pygame.joystick.Joystick(0)
    joystick.init()

if pygame.joystick.Joystick(0).get_axis(0) >= -0.0 and pygame.joystick.Joystick(0).get_axis(0) <= 0.0:
      player_one.speed_y = 5

elif pygame.joystick.Joystick(0).get_axis(0) > -0.1 and pygame.joystick.Joystick(0).get_axis(0) < -0.9:
    player_one.speed_y = -5

elif pygame.joystick(0).get_axis(0) == 0.0:
    player_one.speed_y = -5



#The first if statement checks if the joystick is up and the second one
#checks if the joystick is downwards
# the middle one checks if the if statement is in the middle (not too sure)
#player one and two speed is what gets added on each time

当操纵杆向下移动时,精灵不会移动的实际结果是.

Joystick axis

解决方法:

首先通过将操纵杆的数量乘以pygame.joystick.get_count()来确保您拥有操纵杆.通过pygame.joystick.Joystick.init初始化操纵杆：

joystick = None
if pygame.joystick.get_count() > 0:
    joystick = pygame.joystick.Joystick(0)
    joystick.init()

初始化操纵杆后,可以通过pygame.joystick.Joystick.get_axis获得ist轴值.此函数返回的值在[-1,1]范围内. -1表示最大负倾斜,1表示最大正倾斜.
请注意,游戏手柄或操纵杆的每个模拟摇杆都有2条轴,一条用于水平方向,一条用于垂直方向.由于get_axis()返回的值的量取决于模拟摇杆的倾斜度,因此应将速度乘以该值.
此外,由于硬件的不准确性,您应该忽略死点接近0的值.可以通过使用内置功能abs(x)例如abs(axisval)> 0.1：

if joystick:
    axis_x, axis_y = (joystick.get_axis(0), joystick.get_axis(1))
    if abs(axis_x) > 0.1:
        player_one.speed_x = 5 * axis_x
    if abs(axis_y) > 0.1:
        player_one.speed_y = 5 * axis_y

请参阅以下简单的演示应用程序：

import pygame
pygame.init()

size = (800,600)
screen = pygame.display.set_mode(size)
clock = pygame.time.Clock()
pos = [size[0]/2, size[1]/2]
speed = 5
joystick = None

done = False
while not done:
    clock.tick(60)
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            done = True
        elif event.type == pygame.KEYDOWN:
            if event.key==pygame.K_RETURN:
                done = True

    if joystick:
        axis_x, axis_y = (joystick.get_axis(0), joystick.get_axis(1))
        if abs(axis_x) > 0.1:
            pos[0] += speed * axis_x
        if abs(axis_y) > 0.1:
            pos[1] += speed * axis_y
    else:
        if pygame.joystick.get_count() > 0:
            joystick = pygame.joystick.Joystick(0)
            joystick.init()
            print("joystick initialized")

    screen.fill((0, 0, 255))
    pygame.draw.rect(screen, (255,255,255), (*pos, 10, 10))
    pygame.display.flip()

标签：joystick,pygame,python
来源： https://codeday.me/bug/20191108/2006578.html