gnaw
Reputation: 395
Pygame screen won't fill or draw text
I am new to pygame and python, and I am just making a simple "Dodger" game. I have created a main menu with some buttons.
My main menu:
# show the start screen
done=False
while not done:
screen.fill(black)
text_width,text_height=font.size("Dodger")
#a function for drawing text
drawText('Dodger', font, screen, (screen_width / 2-(text_width/2)), (screen_height / 2-200))
font = pygame.font.SysFont(None, 45)
start_button=button(screen_width/2-125,175,250,50,white,black,'Start')
start_button.draw()
instructions_button=button(screen_width/2-125,250,250,50,white,black,'Instructions')
instructions_button.draw()
back_button=button(screen_width/2-125,325,250,50,white,black,'Back')
back_button.draw()
pygame.display.flip()
I also have a button class:
class button(object):
def __init__(self,x,y,width,height,text_color,background_color,text):
self.rect=pygame.Rect(x,y,width,height)
self.image=pygame.draw.rect(screen, background_color,(self.rect),)
self.x=x
self.y=y
self.width=width
self.height=height
self.text=text
self.text_color=text_color
def check(self):
return self.rect.collidepoint(pygame.mouse.get_pos())
def draw(self):
drawText(self.text,font,screen,self.x+self.width/2,self.y+self.height/2,self.text_color)
pygame.draw.rect(screen,self.text_color,self.rect,3)
Two buttons work, but the third one is not responding.
My code looks like this:
#show start screen
done=False
while not done:
screen.fill(black)
text_width,text_height=font.size("Dodger")
drawText('Dodger', font, screen, (screen_width / 2-(text_width/2)), (screen_height / 2-200))
font = pygame.font.SysFont(None, 45)
#the start button starts the game
start_button=button(screen_width/2-125,175,250,50,white,black,'Start')
start_button.draw()
#my button that is not working
instructions_button=button(screen_width/2-125,250,250,50,white,black,'Instructions')
instructions_button.draw()
#go back to game selection
back_button=button(screen_width/2-125,325,250,50,white,black,'Back')
back_button.draw()
pygame.display.flip()
while not done:
for event in pygame.event.get():
if event.type==QUIT:
terminate()
elif event.type == pygame.MOUSEBUTTONDOWN:
if start_button.check()==True:
#main game code
if instructions_button.check()==True:
#show instructions
if back_button.check()==True:
#go back to game selection
However, my "instructions" button is not working, though the other two work.
Code:
elif instructions_button.check()==True:
screen.fill(black)
drawText('some instructions',font,screen,screen_width/2-127.5, 185)
back_button.draw()
done=False
while not done:
for event in pygame.event.get():
if event.type==QUIT:
terminate()
elif back_button.check()==True:
done=True
The problem is that when I click the button, the screen doesn't fill(screen.fill(black) or draw my text (drawText('some instructions',font,screen,screen_width/2-127.5, 185)).
In my attempts to debug it, I placed various print('hello') to see why it wasn't working:
elif instructions_button.check()==True:
print('hello')
screen.fill(black)
print('hello')
drawText('some instructions',font,screen,screen_width/2-127.5, 185)
back_button.draw()
done=False
while not done:
for event in pygame.event.get():
if event.type==QUIT:
terminate()
elif back_button.check()==True:
done=True
It printed but didn't fill the screen with black.
All help is appreciated!
Complete code:
import pygame,sys,os,random
from pygame.locals import *
from cPickle import load
from asyncore import write
#initalize pygame
pygame.init()
#define colors
black=(0,0,0)
white=(255,255,255)
def terminate():
pygame.quit()
sys.exit()
def drawText(text,font,screen,x,y,color):
textobj=font.render(text,True,color)
textrect=textobj.get_rect(center=(x,y))
screen.blit(textobj,textrect)
class button(object):
def __init__(self,x,y,width,height,text_color,background_color,text):
self.rect=pygame.Rect(x,y,width,height)
self.image=pygame.draw.rect(screen, background_color,(self.rect),)
self.x=x
self.y=y
self.width=width
self.height=height
self.text=text
self.text_color=text_color
def check(self):
return self.rect.collidepoint(pygame.mouse.get_pos())
def draw(self):
drawText(self.text,font,screen,self.x+self.width/2,self.y+self.height/2,self.text_color)
pygame.draw.rect(screen,self.text_color,self.rect,3)
def dodger(screen,clock):
global button
#define variables
white=(255,255,255)
black=(0,0,0)
fps=40
baddieminsize=10
baddiemaxsize=40
baddieminspeed=1
baddiemaxspeed=8
addnewbaddierate=6
player_speed=5
def terminate():
pygame.quit()
sys.exit()
def waitForPlayerToPressKey():
while True:
for event in pygame.event.get():
if event.type==QUIT:
terminate()
if event.type==KEYDOWN:
if event.key==K_ESCAPE: # pressing escape quits
terminate()
return
def playerHasHitBaddie(playerRect, baddies):
for b in baddies:
if playerRect.colliderect(b['rect']):
return True
return False
def drawText(text, font, surface, x, y):
textobj = font.render(text, 1, white)
textrect = textobj.get_rect()
textrect.topleft = (x, y)
surface.blit(textobj, textrect)
def load_hs():
try:
f = open("dodger_hs.txt","rb")
hs = int(f.read())
f.close()
return hs
except:
return 0
def write_hs(hs):
f = open("dodger_hs.txt","wb")
f.write(str(hs).encode())
f.close()
# set up fonts
font = pygame.font.SysFont(None, 90)
# set up images
playerImage = pygame.image.load('player.png')
playerRect = playerImage.get_rect()
baddieImage = pygame.image.load('baddie.png')
# show the start screen
done=False
while not done:
screen.fill(black)
text_width,text_height=font.size("Dodger")
drawText('Dodger', font, screen, (screen_width / 2-(text_width/2)), (screen_height / 2-200))
font = pygame.font.SysFont(None, 45)
start_button=button(screen_width/2-125,175,250,50,white,black,'Start')
start_button.draw()
instructions_button=button(screen_width/2-125,250,250,50,white,black,'Instructions')
instructions_button.draw()
back_button=button(screen_width/2-125,325,250,50,white,black,'Back')
back_button.draw()
pygame.display.flip()
while not done:
for event in pygame.event.get():
if event.type==QUIT:
terminate()
elif event.type == pygame.MOUSEBUTTONDOWN:
if start_button.check()==True:
while not done:
# set up the start of the game
baddies = []
score = 0
playerRect.topleft = (screen_width / 2, screen_height- 50)
moveLeft = moveRight = moveUp = moveDown = False
reverseCheat = slowCheat = False
baddieAddCounter = 0
high_score=load_hs()
while True: # the game loop runs while the game part is playing
score += 1 # increase score
for event in pygame.event.get():
if event.type == QUIT:
terminate()
if event.type == KEYDOWN:
if event.key == ord('z'):
reverseCheat = True
if event.key == ord('x'):
slowCheat = True
if event.key == K_LEFT or event.key == ord('a'):
moveRight = False
moveLeft = True
if event.key == K_RIGHT or event.key == ord('d'):
moveLeft = False
moveRight = True
if event.key == K_UP or event.key == ord('w'):
moveDown = False
moveUp = True
if event.key == K_DOWN or event.key == ord('s'):
moveUp = False
moveDown = True
if event.type == KEYUP:
if event.key == ord('z'):
reverseCheat = False
if event.key == ord('x'):
slowCheat = False
if event.key == K_ESCAPE:
terminate()
if event.key == K_LEFT or event.key == ord('a'):
moveLeft = False
if event.key == K_RIGHT or event.key == ord('d'):
moveRight = False
if event.key == K_UP or event.key == ord('w'):
moveUp = False
if event.key == K_DOWN or event.key == ord('s'):
moveDown = False
# Add new baddies at the top of the screen, if needed.
if not reverseCheat and not slowCheat:
baddieAddCounter += 1
if baddieAddCounter == addnewbaddierate:
baddieAddCounter = 0
baddieSize = random.randint(baddieminsize, baddiemaxsize)
newBaddie = {'rect': pygame.Rect(random.randint(0, screen_width-baddieSize), 0 - baddieSize, baddieSize, baddieSize),
'speed': random.randint(baddieminspeed, baddiemaxspeed),
'surface':pygame.transform.scale(baddieImage, (baddieSize, baddieSize)),
}
baddies.append(newBaddie)
# Move the player around.
if moveLeft and playerRect.left > 0:
playerRect.move_ip(-1 * player_speed, 0)
if moveRight and playerRect.right < screen_width:
playerRect.move_ip(player_speed, 0)
if moveUp and playerRect.top > 0:
playerRect.move_ip(0, -1 * player_speed)
if moveDown and playerRect.bottom < screen_height:
playerRect.move_ip(0, player_speed)
# Move the baddies down.
for b in baddies:
if not reverseCheat and not slowCheat:
b['rect'].move_ip(0, b['speed'])
elif reverseCheat:
b['rect'].move_ip(0, -5)
elif slowCheat:
b['rect'].move_ip(0, 1)
# Delete baddies that have fallen past the bottom.
for b in baddies[:]:
if b['rect'].top > screen_height:
baddies.remove(b)
if score>=high_score:
high_score=score
# Draw the game world on the window.
screen.fill(black)
# Draw the player's rectangle
screen.blit(playerImage, playerRect)
# Draw each baddie
for b in baddies:
screen.blit(b['surface'], b['rect'])
# Draw the score
drawText('Score: %s' % (score), font, screen, 10, 0)
drawText('High Score: %s' % (high_score), font, screen, 10, 30)
pygame.display.update()
# Check if any of the baddies have hit the player.
if playerHasHitBaddie(playerRect, baddies):
break
clock.tick(fps)
write_hs(high_score)
screen.fill(black)
if score<100:
drawText('Your Score: %s' % (score), font,screen,screen_width/2-107.5, 185)
if score<1000 and score>99:
drawText('Your Score: %s' % (score), font,screen,screen_width/2-117.5, 185)
if score<10000 and score>999:
drawText('Your Score: %s' % (score), font,screen,screen_width/2-127.5, 185)
if score<100000 and score>9999:
drawText('Your Score: %s' % (score), font,screen,screen_width/2-127.5, 185)
font = pygame.font.SysFont(None, 90)
text_width,text_height=font.size("Game Over")
drawText('Game Over', font, screen, (screen_width / 2-(text_width/2)), (screen_height / 2-200))
font = pygame.font.SysFont(None, 45)
retry_button=button(screen_width/2-125,250,250,50,white,black,'Retry')
retry_button.draw()
back_button.draw()
pygame.display.flip()
back=False
while not back:
for event in pygame.event.get():
if event.type==QUIT:
terminate()
elif event.type == pygame.MOUSEBUTTONDOWN:
if retry_button.check()==True:
back=True
if back_button.check()==True:
back=True
done=True
elif instructions_button.check()==True:
screen.fill(black)
drawText('Your Score:', font,screen,screen_width/2-127.5, 185)
back_button.draw()
done=False
while not done:
for event in pygame.event.get():
if event.type==QUIT:
terminate()
elif back_button.check()==True:
done=True
elif back_button.check()==True:
done=True
#define other varibles
clock=pygame.time.Clock()
font=pygame.font.SysFont(None,40)
done=False
#set up screen
screen_width=600
screen_height=600
screen=pygame.display.set_mode([screen_width,screen_height])
pygame.display.set_caption('The Arcade')
#set up buttons
dodger_button=button(25,75,125,50,white,black,'Dodger')
#main loop
while not done:
for event in pygame.event.get():
if event.type==QUIT:
terminate()
elif event.type == pygame.MOUSEBUTTONDOWN:
if dodger_button.check():
dodger(screen, clock)
#fill screen with background
screen.fill(black)
#draw buttons
dodger_button.draw()
#draw text
drawText('The Arcade', font, screen, screen_width/2, 25, white)
#change display
pygame.display.flip()
clock.tick(15)
terminate()
Upvotes: 2
Views: 1487
Answers (1)
furas
Reputation: 142651
Problem is because you didn't use pygame.display.update()
All functions draw in buffer in RAM memory and update()/flip() sends data from buffer in memory to buffer in video card which displays it on screen. It is called "Double Buffering" and it is used as soluton for image flickering/tearing.
BTW: you also forgot MOUSEBUTTONDOWN so button Back is "clicked" when mouse touch button without using mouse button.
Other problem - you use done variable to exit from "instruction" but the same variable control external while loop so it exits from game. You have to use different variable. If you would use this inside function then it wouldn't make problem and code would be better organzied.
You don't have to use ==True to check it.
But you could use spaces around == and after , to make code more readable.
See: PEP 8 -- Style Guide for Python Code
elif instructions_button.check():
screen.fill(black)
drawText('Your Score:', font, screen, screen_width/2-127.5, 185)
back_button.draw()
pygame.display.update() # <-- send to video card
doneX = False # <-- use different variable
while not doneX:
for event in pygame.event.get():
if event.type == QUIT:
terminate()
elif event.type == pygame.MOUSEBUTTONDOWN: # <-- check mouse click
if back_button.check():
doneX = True
You don't have to create two functions drawText() and terminate().
Upvotes: 4
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