How to Make Image/Images Disappear in Pygame

How do I make images appear/disappear in pygame?

Generally there's two ways of doing this.

The more common way is to re-paint the entire screen on each iteration of the main loop.

For example:

### Main Loop
while not done:
    # Handle user-input
    for event in pygame.event.get():
        if ( event.type == pygame.QUIT ):
            done = True
        elif ( event.type == pygame.MOUSEBUTTONUP ):
            mouse_position = pygame.mouse.get_pos()               # Location of mouse-click
            player_moves.append ( PlayerMove( mouse_position ) )  # Make a new move

    # Re-paint the screen
    window.fill( OCEAN_BLUE_COLOUR )    # clear the screen
    # Paint each of the players turns
    for m in player_moves:
        m.draw( window )    # paints a hit or miss icon

    pygame.display.flip()

Alternatively, instead of re-painting everything, only change the items that have updated, or when events happen. This is close to the "dirty-rectangles" method of updating.

# Initially paint the screen
window.fill( OCEAN_BLUE_COLOUR )    # clear the screen

### Main Loop
while not done:
    # Handle user-input
    for event in pygame.event.get():
        if ( event.type == pygame.QUIT ):
            done = True
        elif ( event.type == pygame.MOUSEBUTTONUP ):
            mouse_position = pygame.mouse.get_pos()      # Location of mouse-click
            move = playerMove( mouse_position )
            move.draw( window )

    pygame.display.flip()

The difficulty of the second method, is that the program needs to clean up after the movement of on-screen images (otherwise they will leave a trail). Obviously in a battleship game, no on-screen elements move - but things like re-drawing scores or starting a new game will need to somehow erase the background. I'm not sure if this will also re-paint the window after it has been occluded by another window.

If you are a beginner programmer, I would use the first method. It's much simpler, and a lot of games are written this way.

screen.blit(image) in pygame, image disappears

You need to define the NoteList outside of the while loop if the notes should persist, otherwise you create a new empty list each iteration.

NoteList = []

going = True
while going:
    for e in pygame.event.get():
        if e.type == pygame.QUIT:
            going = False
        elif e.type == pygame.midi.MIDIIN:
            print(str(e.data1))
            NoteList.append(int(e.data1-20))

    screen.fill(white)

    for h in NoteList:
        screen.blit(EthnoteIMG, (int(h), 100))

    pygame.display.update()

---

You can use the enumerate function to shift the position:

for g, h in enumerate(NoteList):
    screen.blit(EthnoteIMG, (g*12, int(h)))

Make images appear randomly and disappear after certain time

use variables with time of start showing and end showing.

It is popular method to control different elements in game.

import pygame
import random

# - init -

pygame.init()

screen = pygame.display.set_mode((800, 600))

# - objects -

display_apple = False
start_showing = None
end_showing = None

current_time = pygame.time.get_ticks()

# show first time 
start_showing = current_time + random.randint(1,5)*1000

# - mainloop -

clock = pygame.time.Clock()

running = True

while running:

    # - events -

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False
        elif event.type == pygame.KEYDOWN:
            if event.key == pygame.K_ESCAPE:
                running = False

    # - updates -

    current_time = pygame.time.get_ticks()

    if display_apple:
        # is it time to hide ?
        if end_showing and current_time >= end_showing:
            # hide it
            display_apple = False
            end_showinge = False
            # set time when to show
            start_showing = current_time + random.randint(1,5)*1000
    else:
        # is it time to show ?
        if start_showing and current_time >= start_showing:
            # show it
            display_apple = True
            start_showing = False
            # set time when to hide
            end_showing = current_time + random.randint(1,5)*1000

    # - draws -

    screen.fill((0,0,0))

    if display_apple:
        pygame.draw.rect(screen, (255,0,0), (0,0,100,100))

    pygame.display.flip()

    # - FPS -

    clock.tick(30)

# - end -

pygame.quit()

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