text - 添加新文本时，它出现在底部，其余文本上升

Question

我想在文本框上显示文本，说明我是否命中以及我对敌人造成多少伤害，反之亦然，但我只是想不出如何让文本以这种方式显示。

这是我正在处理的代码:

def textBox(textv):
    lText = []
    text = font.render(str(textv),True,(1,1,1))
    lText.append(text)
    if len(lText) >= 10:
        lText.pop(9)
    screen.blit(lText[0],(20,400))
    screen.blit(lText[1],(20,380))

while True:

    battle_screen()
    for event in pygame.event.get():

        if event.type == pygame.QUIT:
            pygame.quit()
            sys.exit()

    screen.blit(enemy_background,(20,20))
    player.drawPlayer()
    enemy.newEnemy()
    textBox("Daniel")
    textBox("Jenny")
    
    
    pygame.display.update()

Answer 1

渲染文本并将渲染的文本添加到列表中:

text_surf_list = []
text_surf = font.render("Daniel", True, (255, 255, 0))
text_surf_list.append(text_surf)
text_surf = font.render("Jenny", True, (255, 255, 0))
text_surf_list.append(text_surf)

为文本框定义一个矩形区域:

text_box_rect = pygame.Rect(20, 20, 250, 360)

遍历 reversed 中的列表命令。从下向上绘制文本。如果文本不在框中，则从列表中删除该文本(参见 How to remove items from a list while iterating? ):

text_y = box_rect.bottom - font.get_height()
for text_surf in reversed(text_surf_list[:]):
    if text_y <= box_rect.top: 
        text_surf_list.remove(text_surf)
    else:
        surf.blit(text_surf, (box_rect.left + 10, text_y))
    text_y -= font.get_height()

在使用pygame.Surface.set_clip 绘制文本框时设置临时剪切区域:

# set clipping
surf.set_clip(box_rect)

# draw text box
# [...]

# disable clipping
surf.set_clip(None)

---

最小的例子:

import pygame, random

pygame.init()
window = pygame.display.set_mode((400, 400))
clock = pygame.time.Clock()

def draw_scroll_text_box(surf, font, box_rect, text_surf_list):
    surf.set_clip(box_rect)
    text_y = box_rect.bottom - font.get_height() - 10
    for text_surf in reversed(text_surf_list[:]):
        if text_y <= box_rect.top: 
            text_surf_list.remove(text_surf)
        else:
            surf.blit(text_surf, (box_rect.left + 10, text_y))
        text_y -= font.get_height()
    pygame.draw.rect(surf, (164, 164, 164), box_rect, 5)
    surf.set_clip(None)

font = pygame.font.SysFont(None, 50)
text_box_rect = pygame.Rect(20, 20, 250, 360)
text_surf_list = []
timer_event = pygame.USEREVENT+1
pygame.time.set_timer(timer_event, 200)

background = pygame.Surface(window.get_size())
ts, w, h, c1, c2 = 50, *background.get_size(), (32, 32, 32), (64, 64, 64)
tiles = [((x*ts, y*ts, ts, ts), c1 if (x+y) % 2 == 0 else c2) for x in range((w+ts-1)//ts) for y in range((h+ts-1)//ts)]
[pygame.draw.rect(background, color, rect) for rect, color in tiles]

run = True
while run:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False 
        if event.type == timer_event:
            names = ["Daniel", "Jenny", "Patrick", "Sandy", "Bob"]
            text_surf = font.render(random.choice(names), True, (255, 255, 0))
            text_surf_list.append(text_surf)

    window.blit(background, (0, 0))
    draw_scroll_text_box(window, font, text_box_rect, text_surf_list)
    pygame.display.flip()
    clock.tick(60)

pygame.quit()
exit()