Diagonal Movement of Sprites

[twisted1230]

Hello, I'm currently in process of learning Pygame and Python and I'm trying to make a sprite move diagonally across the screen. Although it does work to move the sprite, this code ends up 'painting' the screen when I try to move it diagonally. Is there any way I can fix that?


import pygame, sys, time


from pygame.locals import *


pygame.init()


pygame.display.init()


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


clock=pygame.time.Clock()


image = 'image.png'


Image = pygame.image.load(image).convert_alpha()


x,y=0,0


movex, movey,=0,0


while True:


for event in pygame.event.get():


if event.type == QUIT:


pygame.quit()


sys.exit()


if event.type == KEYDOWN:


if event.key==K_LEFT:


movex=-1


elif event.key==K_RIGHT:


movex=1


elif event.key==K_UP:


movey=-1


elif event.key==K_DOWN:


movey=1


if event.type == KEYUP:


if event.key==K_LEFT:


movex=0


elif event.key==K_RIGHT:


movex=0


elif event.key==K_UP:


movey=0


elif event.key==K_DOWN:


movey=0


x = x+movex


y = y+movey


screen.blit(Image,(x,y))


pygame.display.update()

 

[milkshake]

I think you need to put each movement in a loop and blit to screen on each loop otherwise it will just make a line appear.

 

[zLouD]

Hello,


would you please use http://pastie.org/ or the

 tag for sourcecode?

 

[foxblock]

Hey there, sadly I cannot help you with your code (no Pygame knowledge and from a logic point of view the snipped you posted seems sane), but especially with languages depending on indentation and whitespace (but also for any other) use the

[code][/ code] (remove the space in the closing tag)

tag (aka surround your code with this tag, looks like above) or when editing your post press the icon looking like <> which will open a small editor for you to paste your code in.



Alternatively, especially when it's a longer snippet (>50 lines), consider using http://pastebin.com/ or a similar service for the code.



That way it's much more readable and we are more likely to be able to help you



EDIT: As I said I don't know Pygame, but usually you have to clear the screen between two draw operations.

Drawing a bitmap on the screen kind of works like a stamp. So if you continuously "stamp" bitmaps on the screen they will overlap. Clearing then is like getting a new sheet of paper between each stamp (like how you only draw one frame per page in a flipbook).

The function probably is something like

pygame.display.clear()

or

screen.clear()

Google or the manual should give you the real name.

 

[twisted1230]

Here's the pastebin link.


http://pastebin.com/2wASwZcg


But I did figure out what I was doing wrong. I branched off of your idea Fox and set an actual background so the new code now looks like this.


http://pastebin.com/a1G7qVdV


That has the screen.fill(black) with black=0,0,0. Thank you everyone.

 

[sebt3]

at 800x600, this is not for pandora, right ?

 

[diligentcircle]

If you didn't know, this forum is mostly specific to the Pandora, so if you aren't here for that, let me recommend some other forums (as they'll possibly be much more useful to you in the future than this one):


gamedev.net (game development forum)


python-forum.org (Python forum)


I would also recommend the Pygame mailing list.

 

[bzar]

You should clear the screen before blitting the sprite.


EDIT: aaand prehistorically ninja'd by foxblock. I should read more carefully.