blit

Both appear to update either the entire screen or just a section of the screen, but which does what and how? blit() doesn't update screen - it draws image in buffer. update()/flip() sends buffer to video card which displays it on monitor. If you have code with blit() but without update()/flip() the it will display nothing. flip() sends all buffer to video card. Probably it can use optimized method to do it fast. update() can get list with Rect() and sends only some part of buffer so it could be faster. But you have to know which parts you what to replace. Sometimes it is hard to correctly

I want to display an image with alpha with a specified transparency, but can't figure out how to do it. To elaborate on how I'm struggling with this, the blurb below is a slightly modified hunk of code from this SO answer , but if you run it, you'll see that "image" loses it's native alpha, while the alpha of "image2" never changes! Yuck. #!/usr/bin/env python import pygame, sys pygame.init() window = pygame.display.set_mode((200, 200)) background = pygame.Surface((window.get_size())) background.fill((255, 255, 255)) image = image2 = pygame.image.load('alpha.png') image = image.convert() rect

I've just started learning some pygame (quite new to programming overall), and I have some very basic questions about how it works. I haven't found a place yet that explains when I need to blit or not to include a certain surface on the screen. For example, when drawing a circle: circle = pygame.draw.circle(screen, (0, 0, 0), (100, 100), 15, 1) I don't need to do screen.blit(circle) , but when displaying text: text = font.render("TEXT", 1, (10, 10, 10)) textpos = text.get_rect() textpos.centerx = screen.get_rect().centerx screen.blit(text, textpos) If I don't blit, the text won't appear. To be

I'm fairly new to pygame and ive hit my first stump which I cannot find an answer for.. After blitting text, then changing the string for the same variable, the game instead of replacing the original text with the new, overlaps the two texts..? You have to erase the old text first. Surfaces created by Font.render are ordinary surfaces. Once a Surface is blit, its contents become part of the destination surface, and you have to manipulate the destination surface to erase whatever was blit from the source surface. One way to erase the destination surface is to blit a background surface onto it.