[visionegg] Re: black screen

Hi Darren et al. Sorry, I've been really busy lately and haven't even performed triage to see which questions are simple (and simply answered) versus which require a bit more care... I hope to have some time this weekend.

As far as the .parameters attribute, it is essential for a variety of reasons, the most important of which being the pre-Python 2.2 history of the Vision Egg, where other name assignment tricks weren't possible. One thing it should do, though, is raise a warning if you assign to a parameter that doesn't exist, protecting you in the future from mistakes like screen.parameters.bcgolor = blah (note the misspelling). If screen.bgcolor exists, it is a convenience for reading the variable made for backwards compatibility, and would perform no purpose if assigned to. For this reason, perhaps I should scour the code and remove all instances of it.

I did, once upon a time, have a wiki online which I removed because I didn't feel that I could perform appropriate quality control on it and the amount of information there was rather limited. (I'm sure this was not helped by removing it...) However, I think Gabriel's suggestion of more user contributed example code is undoubtedly the way forward, and perhaps a wiki is the best way to go. I know some projects have been subject to increasingly sophisticated forms of wiki spam, so I think I'd have to implement logins or something. Of course, for this to be a success, people would really have to contribute code back.

Darren, can you at least tell me if, as a newbie, you came across the distinction of using the VisionEgg.FlowControl module and using your own flow control? I can completely understand if the VisionEgg.FlowControl is a little mind-bending at first -- it's meant to solve some delicate issues like a stimulus moving to maintain a state of motion adaptation between experimental trials and so forth. Quite possibly this is more than what most people need, but for a lot of my experiments it was quite necessary.

Wishing I had more time,
Andrew

Darren Weber wrote: 
OK, thanks.  I figured that the word 'parameters' was superfluous, so
screen.bgcolor should suffice.  Sorry I did not look at all demos in
the 5 mins I took to look into this problem.


On Fri, 18 Mar 2005 13:21:00 -0500, Mark Halko <mhalko@xxxxxx> wrote:

A common question:
set the parameter like so:
screen.parameters.bgcolor = (0.0, 0.0, 0.0, 0.0)

This is in the following demos:
az_el_grid.py
convert3d_to_2d.py
displayText.py
dots.py
dots_simple_loop.py
lib3ds-demo.py
makeMovie.py
makeMovie2.py
mouseTarget.py
mouseTarget_user_loop.py
multi_stim.py
put_pixels.py
quicktime.py
target.py

The code :
screen = get_default_screen()
generates a default Screen object
http://www.visionegg.org/reference/VisionEgg.Core.Screen-class.html

You can manipulate parameters of objects by referencing them with dot
notation
MyObject.parameters.MyParameter

print MyObject.parameters.MyParameter
will print the value of the parameter

MyObject.parameters.MyParameter = NewValue
sets the parameter to a new value

On Mar 18, 2005, at 12:42 PM, Darren Weber wrote:


Hi,

the construct

screen = get_default_screen()

creates a gray screen.  The reference documentation for the screen
class indicates that it has a bgcolor parameter.  I've tried a number
of ways to set it, without success.  How do we set this parameter?  I
want, bgcolor = (0.0, 0.0, 0.0), rather than the default gray.

Best, Darren
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