屏幕角落的碰撞错误

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英文:

Collision bugs in corners of screen

问题

当我测试我的代码时,屏幕周围的边界工作得相当好。它可以阻止方块直接向左、右、上或下移动。然而,当我靠近左侧或右侧的墙壁然后再向上或向下移动时,方块会越过边界,我不确定如何修复这个问题。

import pygame

# 初始化pygame

pygame.init()

# 创建屏幕

screen = pygame.display.set_mode((800, 600))

# 标题和图标

pygame.display.set_caption("Runes")
icon = pygame.image.load("rune.png")
pygame.display.set_icon(icon)

# 玩家

player_img = pygame.image.load("testcharacter.jpg")
player_x = 370
player_y = 480
player_x_change = 0
player_y_change = 0

def player(x, y, x_change):
    screen.blit(player_img, (x, y))

running = True

while running:

    screen.fill((0, 0, 0))
    
    for event in pygame.event.get():
        
        if event.type == pygame.QUIT:
            running = False
    
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_LEFT:
                player_x_change = -0.1
            if event.key == pygame.K_RIGHT:
                player_x_change = 0.1
            if event.key == pygame.K_UP:
                player_y_change = -0.1
            if event.key == pygame.K_DOWN:
                player_y_change = 0.1
    
        if event.type == pygame.KEYUP:
            if event.key == pygame.K_LEFT:
                if player_x_change == 0.1:
                    print("Right key still pressed")
                else:
                    player_x_change = 0
            if event.key == pygame.K_RIGHT:
                if player_x_change == -0.1:
                    print("Left key still pressed")
                else:
                    player_x_change = 0
            if event.key == pygame.K_UP:
                if player_y_change == 0.1:
                    print("Down key still pressed")
                else:
                    player_y_change = 0
            if event.key == pygame.K_DOWN:
                if player_y_change == -0.1:
                    print("Up key still pressed")
                else:
                    player_y_change = 0
    
    player_x += player_x_change
    player_y += player_y_change
    
    if player_x <= 5:
        player_x = 5
    elif player_x >= 730:
        player_x = 730
    elif player_y <= 5:
        player_y = 5
    elif player_y >= 532:
        player_y = 532
    
    player(player_x, player_y, player_x_change)
    pygame.display.update()

移动到左侧
从左墙壁按住向下箭头键

我尝试过稍微改变边界位置,但没有效果,问题仍然存在。

英文:

Okay so, when I test my code, the boundaries around the outside of the screen work quite well. It stops the box from going directly left, right, up or down. However, when I go against the left or right wall and then either go up or down, the box goes past the boundary and I'm not sure how to fix this issue.

Code:

import pygame
*Initialize pygame*
pygame.init()
*Create screen*
screen = pygame.display.set_mode((800, 600))
*Caption and Icon*
pygame.display.set_caption(&quot;Runes&quot;)
icon = pygame.image.load(&quot;rune.png&quot;)
pygame.display.set_icon(icon)
*Player*
player_img = pygame.image.load(&quot;testcharacter.jpg&quot;)
player_x = 370
player_y = 480
player_x_change = 0
player_y_change = 0
def player(x, y, x_change):
screen.blit(player_img, (x, y))
running = True
while running:
screen.fill((0, 0, 0))
for event in pygame.event.get():
if event.type == pygame.QUIT:
running = False
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_LEFT:
player_x_change = -0.1
if event.key == pygame.K_RIGHT:
player_x_change = 0.1
if event.key == pygame.K_UP:
player_y_change = -0.1
if event.key == pygame.K_DOWN:
player_y_change = 0.1
if event.type == pygame.KEYUP:
if event.key == pygame.K_LEFT:
if player_x_change == 0.1:
print(&quot;Right key still pressed&quot;)
else:
player_x_change = 0
if event.key == pygame.K_RIGHT:
if player_x_change == -0.1:
print(&quot;Left key still pressed&quot;)
else:
player_x_change = 0
if event.key == pygame.K_UP:
if player_y_change == 0.1:
print(&quot;Down key still pressed&quot;)
else:
player_y_change = 0
if event.key == pygame.K_DOWN:
if player_y_change == -0.1:
print(&quot;Up key still pressed&quot;)
else:
player_y_change = 0
player_x += player_x_change
player_y += player_y_change
if player_x &lt;= 5:
player_x = 5
elif player_x &gt;= 730:
player_x = 730
elif player_y &lt;= 5:
player_y = 5
elif player_y &gt;= 532:
player_y = 532
player(player_x, player_y, player_x_change)
pygame.display.update()

Going to the left side
Holding down the down arrow key from the left wall

I've tried changing the boundary positions a little, but it has had no effect on it, the issue just moves with the boundary.

答案1

得分: 0

问题在这里:

if player_x <= 5:
    player_x = 5
elif player_x >= 730:
    player_x = 730
elif player_y <= 5:
    player_y = 5
elif player_y >= 532:
    player_y = 532

目前代码的编写方式只能达到这一系列if/elif中的一个修正。如果您的玩家试图在屏幕角落对角线移动,这将成为一个问题。

要解决此问题,您需要允许xy的修正在同一帧上同时发生。要做到这一点,只需将第二个elif更改为另一个if。下面是具体的修改,为了清晰起见,添加了一个额外的空行:

if player_x <= 5:
    player_x = 5
elif player_x >= 730:
    player_x = 730

if player_y <= 5:
    player_y = 5
elif player_y >= 532:
    player_y = 532
英文:

The issue is here:

if player_x &lt;= 5:
player_x = 5
elif player_x &gt;= 730:
player_x = 730
elif player_y &lt;= 5:
player_y = 5
elif player_y &gt;= 532:
player_y = 532

As the code is currently written, only one of the corrections in this chain of if/elifs can be reached. That's a problem if your player is trying to move diagonally off the corner of the screen.

To fix the issue, you need to allow the x and y corrections to both happen on the same frame. To do that, just change the second elif to be another if. Here's what that looks like, with an extra blank line thrown in for clarity:

if player_x &lt;= 5:
player_x = 5
elif player_x &gt;= 730:
player_x = 730
if player_y &lt;= 5:
player_y = 5
elif player_y &gt;= 532:
player_y = 532

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  • 本文由 发表于 2023年5月29日 06:28:25
  • 转载请务必保留本文链接:https://go.coder-hub.com/76353820.html
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