爲什麼我的代碼示例導致黑屏？

Question

我的代碼示例只導致黑屏，我不知道爲什麼。我在Windows 7上運行python 2.7，pygame和easygui。

import pygame, easygui, io, time 
BLACK = ( 0, 0, 0) 
WHITE = (255, 255, 255) 
RED = (255, 0, 0) 
GREEN = (0, 255, 0) 
BLUE = (0, 0, 255) 
PINK = (255, 0, 255) 
PURPLE = (130, 0, 130) 

programMode = 0 

class TextPrint: 
    def __init__(self): 
     self.reset() 
     self.font = pygame.font.Font(None, 20) 

    def printline(self, screen, textString): 
     textBitmap = self.font.render(textString, True, WHITE) 
     screen.blit(textBitmap, [self.x, self.y]) 
     self.y += self.line_height 

    def printDebugLine(self, screen, textString): 
     textBitmap = self.font.render(textString, True, RED) 
     screen.blit(textBitmap, [self.debugX, self.debugY]) 
     self.debugY += self.debugLineHeight 

    def reset(self): 
     self.x = 600 
     self.debugX = 600 
     self.y = 400 
     self.debugY = 400 
     self.line_height = 15 
     self.debugLineHeight = 13 

    def indent(self): 
     self.x += 10 

    def unindent(self): 
     self.x -= 10 

pygame.init() 


size = [950, 750] 
screen = pygame.display.set_mode(size) 

pygame.display.set_caption("Robot Joystick Control Version 2.0") 

done = False 

clock = pygame.time.Clock() 

pygame.joystick.init() 

textPrint = TextPrint() 

myfont = pygame.font.SysFont("monospace", 25) 

camImg = pygame.image.load('C:\Users\Evan Develop\Desktop\Python Code  Examples\Zalophus/camImg.png') 
camImgx = 425 
camImgy = 20 

rovImg = pygame.image.load('C:\Users\Evan Develop\Desktop\Python Code Examples\Zalophus/rovImg.png') 
rovImgx = 425 
rovImgy = 385 

hG = pygame.image.load('C:\Users\Evan Develop\Desktop\Python Code Examples\Zalophus/hG.png') 
hGx = 10 
hGy = 500 
while done==False: 
    # EVENT PROCESSING STEP 
    for event in pygame.event.get(): 
     if event.type == pygame.QUIT: 
      done=True 

    JOYBUTTONUP JOYHATMOTION 
     if event.type == pygame.JOYBUTTONDOWN: 
      textPrint.printline(screen, "Joystick button pressed.") 

    screen.fill(BLACK) 
    textPrint.reset() 

    joystick_count = pygame.joystick.get_count() 

    textPrint.printline(screen, "Number of joysticks: {}".format(joystick_count)) 
    textPrint.indent() 

    if (joystick_count == 0): 
     textPrint.printline(screen, "No joysticks connected...") 
    if (joystick_count == 1): 
     i = 0 
     joystick = pygame.joystick.Joystick(i) 
     joystick.init() 

     textPrint.printDebugLine(screen, "Joystick {}".format(i)) 
     textPrint.indent() 
     name = joystick.get_name() 
     textPrint.printDebugLine(screen, "Joystick name: {}".format(name)) 


     axes = joystick.get_numaxes() 
     textPrint.printDebugLine(screen, "Number of axes: {}".format(axes)) 
     textPrint.indent() 

     for i in range(axes): 
      axis = (joystick.get_axis(i) * -100) 
      textPrint.printDebugLine(screen, "Axis {} value: {:>6.3f}".format(i, axis)) 
     textPrint.indent() 


     buttons = joystick.get_numbuttons() 
     textPrint.printline(screen, "Number of buttons: {}".format(buttons)) 
     textPrint.indent() 
     almostExplode1 = False 
     almostExplode2 = False 
     for i in range(buttons): 
      button = joystick.get_button(i) 
      textPrint.printline(screen, "Button {:>2} value: {}".format(i,button)) 
      if (i == 8 and button == 1): 
       almostExplode1 = True 
      if (i == 9 and button == 1): 
       almostExplode2 = True 
      if (almostExplode1 == True and almostExplode2 == True): 
       print ("\n \n OH NOOOOOO!!! Joystick EXPLODED!!!!\n\n" * 20) 
       done = True 
       break 
     textPrint.unindent() 

     hats = joystick.get_numhats() 
     textPrint.printline(screen, " Number of hats: {}".format(hats)) 
     textPrint.indent() 

     for i in range(hats): 
      hat = joystick.get_hat(i) 
      textPrint.printline(screen, "Hat {} value: {}".format(i, str(hat))) 

     textPrint.indent() 


     numOfAxes = axes 
     directionByte = 0 
    # Axes used for driving, drawing, and direction byte. 
     yAxis = int(joystick.get_axis(1) * -100) 
     xAxis = int(joystick.get_axis(0) * -100) 
     zAxis = int(joystick.get_axis(2) * -100) 
     wAxis = int(joystick.get_axis(3) * -100) 
     if (yAxis > 10): 
      directionByte = 1 
     elif (yAxis < -10): 
      directionByte = 2 
     if (xAxis > 10 and (xAxis > yAxis and xAxis > -yAxis)): 
      directionByte = 3 
     elif (xAxis < -10 and (xAxis < yAxis and xAxis < -yAxis)): 
      directionByte = 4 
     if (wAxis > 10 and (wAxis > yAxis and wAxis > -yAxis and wAxis > xAxis and wAxis > -xAxis)): 
      directionByte = 5 
     elif (wAxis < -10 and (wAxis < yAxis and wAxis < -yAxis and wAxis < xAxis and wAxis < -xAxis)): 
      directionByte = 6 

     yAxisDot = int(joystick.get_axis(1) * 250 + 600) 
     xAxisDot = int(joystick.get_axis(0) * 250 + 350) 
     zAxisDot = int(joystick.get_axis(2) * 250 + 350) 
     wAxisDot = int(joystick.get_axis(3) * 250 + 600) 

     pygame.draw.circle(screen, BLUE, [xAxisDot, 600], 15, 0) 
     pygame.draw.circle(screen, RED, [350, yAxisDot], 15, 0) 
     pygame.draw.circle(screen, GREEN, [zAxisDot, 600], 15, 0) 
     pygame.draw.circle(screen, WHITE, [350, wAxisDot], 15, 0) 


label = myfont.render("Cam Feed #1", 1, (255,255,0)) 
screen.blit(label, (450, 25)) 
label = myfont.render("Cam Feed #2", 1, (255,255,0)) 
screen.blit(label, (450, 390)) 


pygame.display.flip() 


clock.tick(25) 
pygame.quit() 

Answer 1

這部分

label = myfont.render("Cam Feed #1", 1, (255,255,0)) 
screen.blit(label, (450, 25)) 
label = myfont.render("Cam Feed #2", 1, (255,255,0)) 
screen.blit(label, (450, 390)) 

pygame.display.flip() 

clock.tick(25) 

需求，成爲您while循環的一部分。