Pygame Display Position

问题:

I need the window position right after I created a pygame window:

window = pygame.display.set_mode((width, height), 0, 32)
pygame.init()

By default, the window starts at 0,0 - but I also need x,y if the user changes the window position. Any ideas?

回答1:

I need x,y coords of the pygame window - either at start or on window move. The last one is nice to have.

I figured out how to center the pygame window at the bottom of the screen:

    pos_x = screen_width / 2 - window_width / 2
    pos_y = screen_height - window_height
    os.environ['SDL_VIDEO_WINDOW_POS'] = '%i,%i' % (pos_x,pos_y)
    os.environ['SDL_VIDEO_CENTERED'] = '0'

Background: I have x,y coords which are screen related and I must convert the screen coords into window-local coords so that I can use them e.g. to display coords inside the pygame window or to discard coords which are outside the pygame window.

With my approach above, I knwo the initial position. But I can only use a single pygame window (because it's always at the same position) and things go wrong if the user moves the window.

回答2:

There is a pygame.display.get_wm_info() call that gets you the Window handler -- from then on, it is using either X11 or Windows API32 to get information from the window through this handler. I didn't find any readily available information on how to do that.

So - just to be clear: there is no ordinary way to do that from within pygame. You have to prooced with another library, possibly using ctypes, after you get the window handler.

On the other hand, if you have to manipulate the window itself, maybe pygame is not the most suitable library for you to use -- you could try PyQt or even GTK+ - they also provide multmedia facilites while being more proper to operate on the level of GUI Windows and other controls.

回答3:

(0,0) remains the upper left corner whether the window is moved or not. If you're trying to make (0,0) stay physically where it was on the screen when the window initialized, I don't think pygame can do that. Try to make your question clearer if you want clearer answers.

回答4:

Here is an example code that return all four corner positions:

from ctypes import POINTER, WINFUNCTYPE, windll
from ctypes.wintypes import BOOL, HWND, RECT


# get our window ID:
hwnd = pygame.display.get_wm_info()["window"]

# Jump through all the ctypes hoops:
prototype = WINFUNCTYPE(BOOL, HWND, POINTER(RECT))
paramflags = (1, "hwnd"), (2, "lprect")

GetWindowRect = prototype(("GetWindowRect", windll.user32), paramflags)

# finally get our data!
rect = GetWindowRect(hwnd)
print "top, left, bottom, right: ", rect.top, rect.left, rect.bottom, rect.right

# bottom, top, left, right:  644 98 124 644

回答5:

It have worked for me :

import os
import pygame
x = 100
y = 45
os.environ['SDL_VIDEO_WINDOW_POS'] = "%d,%d" % (x,y)
pygame.init()
screen = pygame.display.set_mode((100,100))

Taken from https://www.pygame.org/wiki/SettingWindowPosition