Re: [pygame] Object not moving!
Hi, Tanner.
A minor correction: blit(surface, rect) is allowed and has the same effect
as blit(surface, rect.topleft). This is explained in the documentation for
Surface.blit.
The real culprit, as Al indicated, is the third argument to blit, which
essentially causes nothing to blit once the rect's position (e.g. topleft)
moves outside the dimensions of the surface area. This can be a bit
confusing, and the mistake is not at all obvious when using the same rect
for the second and third argument so don't feel bad. :)
Gumm
On Thu, Dec 6, 2012 at 9:54 PM, Al Sweigart a...@inventwithpython.com wrote:
Three things:
1) The line should be: screen.blit(Guy.image, Guy.rect.topleft)
If you look at the pygame documentation for the blit() method here:
http://www.pygame.org/docs/ref/surface.html#Surface.blit
The first parameter to blit() is the pygame.Surface of the image to draw
(you have this right), but the second one should be a tuple of x, y
coordinates for the top left on the screen Surface that Guy.image gets
drawn. That's why it needs to be Guy.rect.topleft, not Guy.rect. The third
parameter is a rect object that shows what section of Guy.image is blitted
to screen. You are drawing the entire Guy.image image, so you don't have to
pass anything for the third one (it's the entire image by default). Passing
Guy.rect is the exact same thing as specifying the full image, so you don't
have to do anything.
Basically, it was passing the pygame.Rect object Guy.rect instead of the
tuple of two ints Guy.rect.topleft that was causing the problem.
2) Change the indentation of the .blit() and .update() lines. They only
need to be inside the while True: loop, not the for loop.
3) Remember to fill the screen image with the background color, or else
you will keep drawing the good guy image over and over on the screen. Add:
screen.fill( (0,0,0) ) to the start of the while True loop. (If you don't,
you'll see what I mean by drawing the good guy image over and over on the
screen.)
-Al
On Thu, Dec 6, 2012 at 7:56 PM, Elias Benevedes
benevedesel...@gmail.comwrote:
Explicit, please? I'm not very good at riddles...
On Thu, Dec 6, 2012 at 7:31 PM, Tanner Johnson tbjohnso...@gmail.comwrote:
I'm the 'point me in the right direction' type, so here's a vague
description of where to go to fix this bug. If you want a more explicit
answer, let me know!
Take a look at the line where you're blitting the image and look at your
inputs to that function. There's a problem there. Take a look at the blit
documentation and see what you can do to fix it.
Once you resolve that, you'll see a second bug, but the answer to that
one should be pretty easy to figure out.
Happy pygaming!
On Thu, Dec 6, 2012 at 6:59 PM, Elias Benevedes
benevedesel...@gmail.com wrote:
Hello everyone! I was having a little bug in my program. I HAVE NO IDEA
WHY! I put print statements everywhere to check to make sure everything was
being executed. Here is my code:
import pygame, sys
from pygame.locals import *
pygame.init()
screen = pygame.display.set_mode((640,480))
class goodGuy(pygame.sprite.Sprite):
def __init__(self):
pygame.sprite.Sprite.__init__(self)
self.image = pygame.image.load('goodGuy.png')
self.rect = self.image.get_rect()
def up(self):
print 'up'
self.rect[1] -= 10
def down(self):
print 'down'
self.rect[1] += 10
def right(self):
print 'right'
self.rect[0] += 10
def left(self):
print 'left'
self.rect[0] -= 10
Guy = goodGuy()
while True:
for event in pygame.event.get():
if event.type == pygame.KEYDOWN:
if event.key == K_UP:
Guy.up()
print 'Up'
if event.key == K_DOWN:
Guy.down()
print 'Down'
if event.key == K_RIGHT:
Guy.right()
print 'Right'
if event.key == K_LEFT:
Guy.left()
print 'Left'
if event.key == K_ESCAPE:
pygame.quit()
sys.exit()
screen.blit(Guy.image, Guy.rect, Guy.rect)
pygame.display.update()
All that I want to happen is that for each respective arrow key, I want
to move the image 10 pixels in that direction. Any help?
--
The validity of internet quotes are getting sketchy nowadays
-Abraham Lincoln
--
The validity of internet quotes are getting sketchy nowadays
-Abraham Lincoln
Re: [pygame] Object not moving!
I'm the 'point me in the right direction' type, so here's a vague
description of where to go to fix this bug. If you want a more explicit
answer, let me know!
Take a look at the line where you're blitting the image and look at your
inputs to that function. There's a problem there. Take a look at the blit
documentation and see what you can do to fix it.
Once you resolve that, you'll see a second bug, but the answer to that one
should be pretty easy to figure out.
Happy pygaming!
On Thu, Dec 6, 2012 at 6:59 PM, Elias Benevedes benevedesel...@gmail.comwrote:
Hello everyone! I was having a little bug in my program. I HAVE NO IDEA
WHY! I put print statements everywhere to check to make sure everything was
being executed. Here is my code:
import pygame, sys
from pygame.locals import *
pygame.init()
screen = pygame.display.set_mode((640,480))
class goodGuy(pygame.sprite.Sprite):
def __init__(self):
pygame.sprite.Sprite.__init__(self)
self.image = pygame.image.load('goodGuy.png')
self.rect = self.image.get_rect()
def up(self):
print 'up'
self.rect[1] -= 10
def down(self):
print 'down'
self.rect[1] += 10
def right(self):
print 'right'
self.rect[0] += 10
def left(self):
print 'left'
self.rect[0] -= 10
Guy = goodGuy()
while True:
for event in pygame.event.get():
if event.type == pygame.KEYDOWN:
if event.key == K_UP:
Guy.up()
print 'Up'
if event.key == K_DOWN:
Guy.down()
print 'Down'
if event.key == K_RIGHT:
Guy.right()
print 'Right'
if event.key == K_LEFT:
Guy.left()
print 'Left'
if event.key == K_ESCAPE:
pygame.quit()
sys.exit()
screen.blit(Guy.image, Guy.rect, Guy.rect)
pygame.display.update()
All that I want to happen is that for each respective arrow key, I want to
move the image 10 pixels in that direction. Any help?
--
The validity of internet quotes are getting sketchy nowadays
-Abraham Lincoln
Re: [pygame] Object not moving!
Explicit, please? I'm not very good at riddles...
On Thu, Dec 6, 2012 at 7:31 PM, Tanner Johnson tbjohnso...@gmail.comwrote:
I'm the 'point me in the right direction' type, so here's a vague
description of where to go to fix this bug. If you want a more explicit
answer, let me know!
Take a look at the line where you're blitting the image and look at your
inputs to that function. There's a problem there. Take a look at the blit
documentation and see what you can do to fix it.
Once you resolve that, you'll see a second bug, but the answer to that one
should be pretty easy to figure out.
Happy pygaming!
On Thu, Dec 6, 2012 at 6:59 PM, Elias Benevedes
benevedesel...@gmail.comwrote:
Hello everyone! I was having a little bug in my program. I HAVE NO IDEA
WHY! I put print statements everywhere to check to make sure everything was
being executed. Here is my code:
import pygame, sys
from pygame.locals import *
pygame.init()
screen = pygame.display.set_mode((640,480))
class goodGuy(pygame.sprite.Sprite):
def __init__(self):
pygame.sprite.Sprite.__init__(self)
self.image = pygame.image.load('goodGuy.png')
self.rect = self.image.get_rect()
def up(self):
print 'up'
self.rect[1] -= 10
def down(self):
print 'down'
self.rect[1] += 10
def right(self):
print 'right'
self.rect[0] += 10
def left(self):
print 'left'
self.rect[0] -= 10
Guy = goodGuy()
while True:
for event in pygame.event.get():
if event.type == pygame.KEYDOWN:
if event.key == K_UP:
Guy.up()
print 'Up'
if event.key == K_DOWN:
Guy.down()
print 'Down'
if event.key == K_RIGHT:
Guy.right()
print 'Right'
if event.key == K_LEFT:
Guy.left()
print 'Left'
if event.key == K_ESCAPE:
pygame.quit()
sys.exit()
screen.blit(Guy.image, Guy.rect, Guy.rect)
pygame.display.update()
All that I want to happen is that for each respective arrow key, I want
to move the image 10 pixels in that direction. Any help?
--
The validity of internet quotes are getting sketchy nowadays
-Abraham Lincoln
--
The validity of internet quotes are getting sketchy nowadays
-Abraham Lincoln
Re: [pygame] Object not moving!
Three things:
1) The line should be: screen.blit(Guy.image, Guy.rect.topleft)
If you look at the pygame documentation for the blit() method here:
http://www.pygame.org/docs/ref/surface.html#Surface.blit
The first parameter to blit() is the pygame.Surface of the image to draw
(you have this right), but the second one should be a tuple of x, y
coordinates for the top left on the screen Surface that Guy.image gets
drawn. That's why it needs to be Guy.rect.topleft, not Guy.rect. The third
parameter is a rect object that shows what section of Guy.image is blitted
to screen. You are drawing the entire Guy.image image, so you don't have to
pass anything for the third one (it's the entire image by default). Passing
Guy.rect is the exact same thing as specifying the full image, so you don't
have to do anything.
Basically, it was passing the pygame.Rect object Guy.rect instead of the
tuple of two ints Guy.rect.topleft that was causing the problem.
2) Change the indentation of the .blit() and .update() lines. They only
need to be inside the while True: loop, not the for loop.
3) Remember to fill the screen image with the background color, or else you
will keep drawing the good guy image over and over on the screen. Add:
screen.fill( (0,0,0) ) to the start of the while True loop. (If you don't,
you'll see what I mean by drawing the good guy image over and over on the
screen.)
-Al
On Thu, Dec 6, 2012 at 7:56 PM, Elias Benevedes benevedesel...@gmail.comwrote:
Explicit, please? I'm not very good at riddles...
On Thu, Dec 6, 2012 at 7:31 PM, Tanner Johnson tbjohnso...@gmail.comwrote:
I'm the 'point me in the right direction' type, so here's a vague
description of where to go to fix this bug. If you want a more explicit
answer, let me know!
Take a look at the line where you're blitting the image and look at your
inputs to that function. There's a problem there. Take a look at the blit
documentation and see what you can do to fix it.
Once you resolve that, you'll see a second bug, but the answer to that
one should be pretty easy to figure out.
Happy pygaming!
On Thu, Dec 6, 2012 at 6:59 PM, Elias Benevedes benevedesel...@gmail.com
wrote:
Hello everyone! I was having a little bug in my program. I HAVE NO IDEA
WHY! I put print statements everywhere to check to make sure everything was
being executed. Here is my code:
import pygame, sys
from pygame.locals import *
pygame.init()
screen = pygame.display.set_mode((640,480))
class goodGuy(pygame.sprite.Sprite):
def __init__(self):
pygame.sprite.Sprite.__init__(self)
self.image = pygame.image.load('goodGuy.png')
self.rect = self.image.get_rect()
def up(self):
print 'up'
self.rect[1] -= 10
def down(self):
print 'down'
self.rect[1] += 10
def right(self):
print 'right'
self.rect[0] += 10
def left(self):
print 'left'
self.rect[0] -= 10
Guy = goodGuy()
while True:
for event in pygame.event.get():
if event.type == pygame.KEYDOWN:
if event.key == K_UP:
Guy.up()
print 'Up'
if event.key == K_DOWN:
Guy.down()
print 'Down'
if event.key == K_RIGHT:
Guy.right()
print 'Right'
if event.key == K_LEFT:
Guy.left()
print 'Left'
if event.key == K_ESCAPE:
pygame.quit()
sys.exit()
screen.blit(Guy.image, Guy.rect, Guy.rect)
pygame.display.update()
All that I want to happen is that for each respective arrow key, I want
to move the image 10 pixels in that direction. Any help?
--
The validity of internet quotes are getting sketchy nowadays
-Abraham Lincoln
--
The validity of internet quotes are getting sketchy nowadays
-Abraham Lincoln
