在 pygame 中绘制但未显示的线条

Question

我正在尝试编写一个简单的融资程序，并且仍在设计 UI。但是，我运行遇到了一些问题。

def stockdisplay(asset, turn):
    win.fill(dblue)
    stockA = pygame.Rect(0, 160, 250, 170)
    stockB = pygame.Rect(250, 160, 250, 170)
    stockC = pygame.Rect(0, 330, 250, 170)
    leave = pygame.Rect(250, 330, 250, 170)
    loadImage("../Images/stock.png", (245, 150), (200, 300))
    WriteLine("S    T", white, bigFont, (110, 75))
    WriteLine("C    K", white, bigFont, (410, 75))
    pygame.draw.line(win, white, (0, 160), (500, 160))
    pygame.draw.line(win, white, (250, 160), (250, 500))
    pygame.draw.line(win, white, (0, 330), (500, 330))
    while True:
        for event in pygame.event.get():
            if (event.type == pygame.KEYDOWN and event.key == pygame.K_ESCAPE) or (event.type == pygame.QUIT): exit() #Escape Mechanism
            if (event.type == pygame.MOUSEBUTTONUP and event.button == 1):
                if stockA.collidepoint(event.pos): print("Stock A")
                elif stockB.collidepoint(event.pos): print("Stock B")
                elif stockC.collidepoint(event.pos): print("Stock C")
                elif leave.collidepint(event.pos): main(asset, turn)
def WriteLine(text, colour, font, pos):
    text2 = font.render(text, True, colour)
    textRect = text2.get_rect()
    textRect.center = pos
    win.blit(text2, textRect)
    pygame.display.update()
def loadImage(src, pos, scale):
    img = pygame.image.load(src)
    img = pygame.transform.scale(img, scale)
    imgRect = img.get_rect()
    imgRect.center = pos
    win.blit(img, imgRect)
    pygame.display.update()

这些是我写的用来显示 UI 的函数。但是，每当我运行程序时，本应由 pygame.draw.line() 绘制的线条根本不存在。矩形仍在程序中，因为它们仍然响应点击。有什么办法可以解决这个问题吗？

Answer 1

调用一次pygame.display.update()即可，但需要在所有绘图完成后调用。从 WriteLine 和 loadImage 中删除 pygame.display.update()，但在应用程序循环结束时执行单个 pygame.display.update()：

def stockdisplay(asset, turn):
    win.fill(dblue)
    stockA = pygame.Rect(0, 160, 250, 170)
    stockB = pygame.Rect(250, 160, 250, 170)
    stockC = pygame.Rect(0, 330, 250, 170)
    leave = pygame.Rect(250, 330, 250, 170)
    loadImage("../Images/stock.png", (245, 150), (200, 300))
    WriteLine("S    T", white, bigFont, (110, 75))
    WriteLine("C    K", white, bigFont, (410, 75))
    pygame.draw.line(win, white, (0, 160), (500, 160))
    pygame.draw.line(win, white, (250, 160), (250, 500))
    pygame.draw.line(win, white, (0, 330), (500, 330))
    
    while True:
        for event in pygame.event.get():
            if (event.type == pygame.KEYDOWN and event.key == pygame.K_ESCAPE) or (event.type == pygame.QUIT): exit() #Escape Mechanism
            if (event.type == pygame.MOUSEBUTTONUP and event.button == 1):
                if stockA.collidepoint(event.pos): print("Stock A")
                elif stockB.collidepoint(event.pos): print("Stock B")
                elif stockC.collidepoint(event.pos): print("Stock C")
                elif leave.collidepint(event.pos): main(asset, turn)

        pygame.display.update() # <-- INSERT

def WriteLine(text, colour, font, pos):
    text2 = font.render(text, True, colour)
    textRect = text2.get_rect()
    textRect.center = pos
    win.blit(text2, textRect)
    # pygame.display.update() <-- DELETE

def loadImage(src, pos, scale):
    img = pygame.image.load(src)
    img = pygame.transform.scale(img, scale)
    imgRect = img.get_rect()
    imgRect.center = pos
    win.blit(img, imgRect)
    # pygame.display.update() <-- DELETE

典型的 PyGame 应用程序循环必须：

限制每秒帧数以限制 CPU 使用 pygame.time.Clock.tick
通过调用 pygame.event.pump() or pygame.event.get().
根据输入事件和时间（分别为帧）更新对象的游戏状态和位置
清除整个显示或绘制背景
绘制整个场景（blit 所有对象）
通过调用 pygame.display.update() or pygame.display.flip()

在 pygame 中绘制但未显示的线条

Lines drawn in pygame but are not displayed

python

user-interface

pygame