在 PyGame 中切换块 PNG

Question

我正在 Pygame 中创建 2D Minecraft 克隆，到目前为止一切进展顺利。我被困在如何切换块的图片以便它放置不同的块上。存储PNG的变量是“block”。我希望能够使用左/右箭头键在其他 8 个图像之间切换。我曾考虑过在“block”变量中列出这些图像，但我不知道如何实际实现它。

import pygame

pygame.init()
win = pygame.display.set_mode((480,320))
pygame.display.set_caption(("PyCraft"))
block = pygame.image.load("Grass.png")
running = True

positions = []

def rtm(n, m):
    return round(n / m) * m

while running:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
        running = False

        if event.type == pygame.MOUSEBUTTONDOWN:
            px, py = event.pos  
            pxr = rtm(px, 32)
            pyr = rtm(py, 32)
            positions.append((pxr, pyr))

        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_SPACE:
                positions = []

    mx, my = pygame.mouse.get_pos()

    mxr = rtm(mx, 32)
    myr = rtm(my, 32)

    if mxr > 448:
        mxr = 448
    if myr > 288:
        myr = 288

    win.fill("white")
    for pos in positions:
    win.blit(block, pos)
    win.blit(block, (mxr, myr))
    pygame.display.update()

Answer 1

假设您不想为每个块创建一个精灵，最简单的方法（imo）是保留您想要的所有精灵的列表，并使用全局变量循环遍历它们。下面的代码可以容纳模块化数量的图像 - 我无法测试它，但这应该可以工作，如果有任何问题请告诉我，我会相应地更新它。

import pygame

pygame.init()
win = pygame.display.set_mode((480,320))
pygame.display.set_caption(("PyCraft"))

BLOCK_LIST = [pygame.image.load('path here'),...]    #load all block images into this list
ACTIVE_BLOCK = BLOCK_LIST[0]
COUNT = 0    #which block is currently selected

running = True

positions = []

def rtm(n, m):
    return round(n / m) * m

while running:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
        running = False

        if event.type == pygame.MOUSEBUTTONDOWN:
            px, py = event.pos  
            pxr = rtm(px, 32)
            pyr = rtm(py, 32)
            positions.append((pxr, pyr))

        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_SPACE:
                positions = []

            #deal with arrow keys
            if event.key == pygame.K_LEFT:
                #move count left, keep it within the bounds of the list and update active block img
                if COUNT == 0:    #count is below 0, so loop to the end of the list instead
                    COUNT = len(BLOCK_LIST)
                COUNT = (COUNT - 1) % len(BLOCK_LIST)
                ACTIVE_BLOCK = BLOCK_LIST[count]

            if event.key == pygame.K_RIGHT:
                #do the same thing but add one instead of removing one from count
                COUNT = (COUNT + 1) % len(BLOCK_LIST)
                ACTIVE_BLOCK = BLOCK_LIST[count]

    mx, my = pygame.mouse.get_pos()

    mxr = rtm(mx, 32)
    myr = rtm(my, 32)

    if mxr > 448:
        mxr = 448
    if myr > 288:
        myr = 288

    win.fill("white")
    for pos in positions:
        win.blit(ACTIVE_BLOCK, pos)    #always blit whatever the active block is
    win.blit(ACTIVE_BLOCK, (mxr, myr))
    pygame.display.update()

希望这有帮助！