如何更改pyglet窗口的颜色

Question

I am creating a program which must change the color of individual pixels in a pyglet window. I am unable to find any way to do this in the docs. Is there a way to do this?

Answer 1

For funsies, I'll add another answer that is more along the lines of what you might need. Because the window itself will be whatever "clear" color buffer you decide via:

window = pyglet.window.Window(width=width, height=height)
pyglet.gl.glClearColor(0.5,0,0,1) # Note that these are values 0.0 - 1.0 and not (0-255).

So changing the background is virtually impossible because it's "nothing".
You can however draw pixels on the background via the .draw() function.

import pyglet
from random import randint

width, height = 500, 500
window = pyglet.window.Window(width=width, height=height)

@window.event
def on_draw():
    window.clear()
    for i in range(10):
        x = randint(0,width)
        y = randint(0,height)
        pyglet.graphics.draw(1, pyglet.gl.GL_POINTS,
                ('v2i', (x, y)),
                ('c3B', (255, 255, 255))
            )

pyglet.app.run()

This will create 10 randomly placed white dots on the background.
To add anything above that simply place your .blit() or .draw() features after the pyglet.graphics.draw() line.

Answer 2

You could use the magic function SolidColorImagePattern and modify the data you need.

R,G,B,A = 255,255,255,255
pyglet.image.SolidColorImagePattern((R,G,B,A).create_image(width,height)

This is a .blit() :able image. It's white, and probably not what you want.
So we'll do some more wizardry and swap out all the pixels for random ones (War of the ants):

import pyglet
from random import randint

width, height = 500, 500
window = pyglet.window.Window(width=width, height=height)
image = pyglet.image.SolidColorImagePattern((255,255,255,255)).create_image(width, height)

data = image.get_image_data().get_data('RGB', width*3)
new_image = b''

for i in range(0, len(data), 3):
    pixel = bytes([randint(0,255)]) + bytes([randint(0,255)]) + bytes([randint(0,255)])
    new_image += pixel

image.set_data('RGB', width*3, new_image)

@window.event
def on_draw():
    window.clear()
    image.blit(0, 0)

pyglet.app.run()

For educational purposes, I'll break it down into easier chunks.

image = pyglet.image.SolidColorImagePattern((255,255,255,255)).create_image(width, height)

Creates a solid white image, as mentioned. It's width and height matches the window-size.

We then grab the image data:

data = image.get_image_data().get_data('RGB', width*3)

This bytes string will contain width*height*<format> , meaning a 20x20 image will be 1200 bytes big because RGB takes up 3 bytes per pixel.

new_image = b''

for i in range(0, len(data), 3):
    pixel = bytes([randint(0,255)]) + bytes([randint(0,255)]) + bytes([randint(0,255)])
    new_image += pixel

This whole block loops over all the pixels (len(data) is just a convenience thing, you could do range(0, width*height*3, 3) as well, but meh.
The pixel contists of 3 randint(255) bytes objects combined into one string like so:

pixel = b'xffxffxff'

That's also the reason for why we step 3 in our range(0, len(data), 3) . Because one pixel is 3 bytes "wide".

Once we've generated all the pixels (for some reason the bytes object image can't be modified.. I could swear I've modified bytes "strings" before.. I'm tired tho so that's probably a utopian dream or something.
Anyhow, once all that sweet image building is done, we give the image object it's new data by doing:

image.set_data('RGB', width*3, new_image)

And that's it. Easy as butter in sunshine on a -45 degree winter day.

Docs:

• https://pyglet.readthedocs.io/en/pyglet-1.2-maintenance/programming_guide/quickstart.html
• https://github.com/Torxed/PygletGui/blob/master/gui_classes_generic.py
• https://pythonhosted.org/pyglet/api/pyglet.image.ImageData-class.html#get_image_data
• https://pythonhosted.org/pyglet/api/pyglet.image.ImageData-class.html#set_data

You can also opt in to get a region, and just modify a region.. But I'll leave the tinkering up to you :)

Answer 3

You can blit pixels into background 'image'. You can look at this Stack Overflow question.

Answer 4

If you mean background color, I can help. There is one option that I know of, the pyglet.gl.glClearColor function.

for example,:

import pyglet
from pyglet.gl import glClearColor

win = pyglet.window.Window(600, 600, caption = "test")

glClearColor(255, 255, 255, 1.0) # red, green, blue, and alpha(transparency)
def on_draw():
    win.clear()

That will create a window with a white background(as opposed to the default, black)