pixelwise drawing in pyglet (python)

Question

OK. I'm tired of googling and reading throught lots of documentation with no results.

My aim is simple: get pyglet to draw an image pixel by pixel.

I've been searching for hours with no results. Can anyone give an example of a short program that draws in a display specifying the color pixel by pixel? For example: drawing a gradient from black to white.

Do you need to use pyglet? pygame would make this much easier — John La Rooy
@gnibbler: Yeah, my code was originally written in pygame and it worked (at least at home). But I needed to run it at my university and I couldn't make virtualenv to support pygame... So I went for pyglet — Manuel Araoz

Alex Martelli Alex Martelli · Accepted Answer · 2010-08-20T03:03:39

As long as you realize this is going to take a long time...:

pyglet.graphics.draw can drawn one or more points when you pass it pyglet.gl.GL_POINTS, and you can pass attributes such as color as well as coordinates. For example:

for i in range(50):
    for j in range(50):
        color = int(2.56 * (i + j))
        pyglet.graphics.draw(1, pyglet.gl.GL_POINTS,
            ('v2i', (i, j)),
            ('c3B', (color, color, color))
        )

draws a 50 by 50 square with a diagonal gradient from black to white-ish. Just don't expect it to be particularly fast at doing that;-) -- GL is really oriented to graphics with much higher level of abstraction, not "pixel by pixel" painting.

You could get a modicum of extra speed by computing (say) a row at a time, and drawing that, instead of actually drawing pixels singly. But it still won't be super-fast!-)

pixelwise drawing in pyglet (python)

1 Answers