相同代码不同结果

Question

在我的游戏中，我有两个玩家控制的坦克。两辆坦克都有相同的代码，但其中一辆改变了变量名。两个坦克控制代码如下。运动控制工作正常，但它是不起作用的力量。不知何故，无论哪一套坦克控制是第一位的，它都是工作的。用户应该使用"o"、"p"和"e"、"r"来改变功率，但是有了第二组控制代码，即使有keyup线，功率也会总是在变化而不是与用户保持一致放开钥匙。

我看过一些堆栈溢出和 youtube 问题，但它太高级了，我无法理解。我也请朋友和我的老师看过。

keys= pygame.key.get_pressed()

if keys[pygame.K_j]:
    tank1x -= tankmove
elif keys[pygame.K_l]:
    tank1x += tankmove
elif keys[pygame.K_i]:
    changeturret1 = 1
elif keys[pygame.K_k]:
    changeturret1 = -1
elif keys[pygame.K_u]:
    fire1(gun1,tank1x,tank1y,currentturretpos1,fire_power1)
elif keys[pygame.K_o]:
    power_change1 = -1
elif keys[pygame.K_p]:
    power_change1 = 1

for event in pygame.event.get():
    if event.type == pygame.QUIT:
        pygame.quit()
    elif event.type == pygame.KEYUP:
        if event.key == pygame.K_i or event.key == pygame.K_k:
            changeturret1 = 0
        if event.key == pygame.K_o or event.key == pygame.K_p:
            power_change1 = 0

currentturretpos1 += changeturret1
if currentturretpos1 > 9:
    currentturretpos1 = 9
elif currentturretpos1 < 0:
    currentturretpos1 = 0

fire_power1 += power_change1
if fire_power1 > 100:
    fire_power1 = 100
elif fire_power1 < 1:
    fire_power1 = 1

message("Power: "+str(fire_power1)+"%",black,850,100)


if keys[pygame.K_a]:
    tankx -= tankmove
elif keys[pygame.K_d]:
    tankx += tankmove
elif keys[pygame.K_w]:
    changeturret = 1
elif keys[pygame.K_s]:
    changeturret = -1
elif keys[pygame.K_q]:
    fire(gun,tankx,tanky,currentturretpos,fire_power)
elif keys[pygame.K_e]:
    power_change = -1
elif keys[pygame.K_r]:
    power_change = 1

for event in pygame.event.get():
    if event.type == pygame.QUIT:
        pygame.quit()
    elif event.type == pygame.KEYUP:
        if event.key == pygame.K_w or event.key == pygame.K_s:
            changeturret = 0
        if event.key == pygame.K_e or event.key == pygame.K_r:
            power_change = 0

currentturretpos += changeturret
if currentturretpos > 9:
    currentturretpos = 9
elif currentturretpos < 0:
    currentturretpos = 0

fire_power += power_change 
if fire_power > 100:
    fire_power = 100
elif fire_power < 1:
    fire_power = 1

message("Power: "+str(fire_power)+"%",black,0,100)

用户应该使用"e"、"r"和"o"、"p"来改变功率，松开钥匙，功率不会改变, 但保持功率水平。

Answer 1

问题是有原因的，因为您有 2 个事件循环。所有事件都在第一个循环中处理，但是键 pygame.K_w、pygame.K_s、pygame.K_e、pygame.K_r 没有在第一个事件循环中处理。第二个事件循环根本不会获得任何事件（大部分）。
在 1 个游戏循环中实现 1 个事件循环！

pygame.key.get_pressed() are evaluated, when the pygame.events are handled by either pygame.event.get() or pygame.event.pump()返回的状态。
在事件循环后调用pygame.key.get_pressed()：

# the one and only event loop
for event in pygame.event.get():
    if event.type == pygame.QUIT:
        pygame.quit()
    elif event.type == pygame.KEYUP:
        if event.key == pygame.K_i or event.key == pygame.K_k:
            changeturret1 = 0
        if event.key == pygame.K_o or event.key == pygame.K_p:
            power_change1 = 0
        if event.key == pygame.K_w or event.key == pygame.K_s:
            changeturret = 0
        if event.key == pygame.K_e or event.key == pygame.K_r:
            power_change = 0

# get the key states after 'pygame.event.get()'
keys = pygame.key.get_pressed()

if keys[pygame.K_j]:
    tank1x -= tankmove
elif keys[pygame.K_l]:
    tank1x += tankmove
elif keys[pygame.K_i]:
    changeturret1 = 1
elif keys[pygame.K_k]:
    changeturret1 = -1
elif keys[pygame.K_u]:
    fire1(gun1,tank1x,tank1y,currentturretpos1,fire_power1)
elif keys[pygame.K_o]:
    power_change1 = -1
elif keys[pygame.K_p]:
    power_change1 = 1

currentturretpos1 += changeturret1
if currentturretpos1 > 9:
    currentturretpos1 = 9
elif currentturretpos1 < 0:
    currentturretpos1 = 0

fire_power1 += power_change1
if fire_power1 > 100:
    fire_power1 = 100
elif fire_power1 < 1:
    fire_power1 = 1

message("Power: "+str(fire_power1)+"%",black,850,100)

if keys[pygame.K_a]:
    tankx -= tankmove
elif keys[pygame.K_d]:
    tankx += tankmove
elif keys[pygame.K_w]:
    changeturret = 1
elif keys[pygame.K_s]:
    changeturret = -1
elif keys[pygame.K_q]:
    fire(gun,tankx,tanky,currentturretpos,fire_power)
elif keys[pygame.K_e]:
    power_change = -1
elif keys[pygame.K_r]:
    power_change = 1

currentturretpos += changeturret
if currentturretpos > 9:
    currentturretpos = 9
elif currentturretpos < 0:
    currentturretpos = 0

fire_power += power_change 
if fire_power > 100:
    fire_power = 100
elif fire_power < 1:
    fire_power = 1

message("Power: "+str(fire_power)+"%",black,0,100)

相同代码不同结果

Identical codes with different results

python

user-controls

pygame

python-3.x