I am trying to blit an image on the screen when clicking a button in line
screen.blit(buttonPlusImage,
[random.randrange(560, 680),
random.randrange(330, 450)])
but the image disappears not long after because of the screen refreshes I got (I am using these 3 lines for updating the display: pygame.display.flip(), FPS.tick(144) and screen.fill(white)). How can i do it in a way that the image stays on the screen and not go away with the screen.fill(white)? (I think that is what's causing it).
I pasted the code in https://dpaste.org/qGdi
import pygame
import random
pygame.init()
# variables
mainLoop = True
font = pygame.font.SysFont('comicsansms', 25)
white = [255, 255, 255]
green = [0, 150, 0]
gray = [140, 140, 140]
black = [0, 0, 0]
clickNum = 0
clickAmount = 1
FPS = pygame.time.Clock()
screen = pygame.display.set_mode((1300, 700))
# functions
def switchButton01():
global button02
button02 = pygame.transform.scale(button02, (100, 100))
screen.blit(button02, [580, 350])
for event in pygame.event.get():
if event.type == pygame.MOUSEBUTTONDOWN:
global clickNum
clickNum += 1
screen.blit(buttonPlusImage, [random.randrange(560, 680), random.randrange(330, 450)])
if event.type == pygame.KEYDOWN and event.key == pygame.K_ESCAPE:
pygame.quit()
quit()
# load images
button01 = pygame.image.load('button_100.png')
button02 = pygame.image.load('button_100hovered.png')
icon = pygame.image.load('icon_128.png')
buttonPlusImage = pygame.image.load('buttonPlus_32.png')
# window itself and icon
pygame.display.set_caption("incremental adventures")
pygame.display.set_icon(icon)
while mainLoop:
pygame.display.flip()
FPS.tick(144)
screen.fill(white)
# actual content in the game
button01 = pygame.transform.scale(button01, (100, 100))
screen.blit(button01, [580, 350])
click_counter_text = font.render("Click counter: ", True, black, white)
screen.blit(click_counter_text, [525, 50])
button01rect = button01.get_rect(center=(630, 400))
button01collidepoint = button01rect.collidepoint(pygame.mouse.get_pos())
click_counter = font.render((str(clickNum)), True, black, white)
screen.blit(click_counter, [700, 50])
if button01collidepoint:
switchButton01()
# quits
for event in pygame.event.get():
if event.type == pygame.QUIT:
pygame.quit()
quit()
if event.type == pygame.KEYDOWN and event.key == pygame.K_ESCAPE:
pygame.quit()
quit()
I did not change everything.
Avoid multiple event loops in the application loop. Note, pygame.event.get() removes all e vent from the queue. So either the first or the 2nd event loop would get the events. But not both loops. You can get rid about that, by getting the events once in the loops and using the list of events multiple times:
while mainLoop:
events = pygame.event.get()
# [...]
if button01collidepoint:
switchButton01(events)
# [...]
for event in events:
# [...]
If you want that the image stays on the screen then you have to draw it in every frame. Add a which stores the position of the button buttonPlusPos and draw the position in the main application loop. The function switchButton01 has toi return the position:
buttonPlusPos = None
while mainLoop:
# [...]
if button01collidepoint:
buttonPlusPos = switchButton01(events, buttonPlusPos)
if buttonPlusPos:
screen.blit(buttonPlusImage, buttonPlusPos)
The function switchButton01 doesn't blit the button, it just returns the position. Furthermore list of events is passed to the function and the function process the events in the list rather than retrieving its "own" list. In any cas the position of the image is returned. Either the new position or the current position (which is allowed to be None):
def switchButton01(events, buttonPlusPos):
global button02
button02 = pygame.transform.scale(button02, (100, 100))
screen.blit(button02, [580, 350])
for event in events:
if event.type == pygame.MOUSEBUTTONDOWN:
global clickNum
clickNum += 1
return (random.randrange(560, 680), random.randrange(330, 450))
return buttonPlusPos
Full code:
import pygame
import random
pygame.init()
# variables
mainLoop = True
font = pygame.font.SysFont('comicsansms', 25)
white = [255, 255, 255]
green = [0, 150, 0]
gray = [140, 140, 140]
black = [0, 0, 0]
clickNum = 0
clickAmount = 1
FPS = pygame.time.Clock()
screen = pygame.display.set_mode((1300, 700))
# functions
def switchButton01(events, buttonPlusPos):
global button02
button02 = pygame.transform.scale(button02, (100, 100))
screen.blit(button02, [580, 350])
for event in events:
if event.type == pygame.MOUSEBUTTONDOWN:
global clickNum
clickNum += 1
return (random.randrange(560, 680), random.randrange(330, 450))
return buttonPlusPos
# load images
button01 = pygame.image.load('button_100.png')
button02 = pygame.image.load('button_100hovered.png')
icon = pygame.image.load('icon_128.png')
buttonPlusImage = pygame.image.load('buttonPlus_32.png')
# window itself and icon
pygame.display.set_caption("incremental adventures")
pygame.display.set_icon(icon)
buttonPlusPos = None
while mainLoop:
pygame.display.flip()
FPS.tick(144)
screen.fill(white)
events = pygame.event.get()
# actual content in the game
button01 = pygame.transform.scale(button01, (100, 100))
screen.blit(button01, [580, 350])
click_counter_text = font.render("Click counter: ", True, black, white)
screen.blit(click_counter_text, [525, 50])
button01rect = button01.get_rect(center=(630, 400))
button01collidepoint = button01rect.collidepoint(pygame.mouse.get_pos())
click_counter = font.render((str(clickNum)), True, black, white)
screen.blit(click_counter, [700, 50])
if button01collidepoint:
buttonPlusPos = switchButton01(events, buttonPlusPos)
if buttonPlusPos:
screen.blit(buttonPlusImage, buttonPlusPos)
# quits
for event in events:
if event.type == pygame.QUIT:
pygame.quit()
quit()
if event.type == pygame.KEYDOWN and event.key == pygame.K_ESCAPE:
pygame.quit()
quit()