DrawLines

1
Hi,

I'm having trouble getting Screen DrawLines to work on Windows (latest
beta update). The other 'OpenGl functions for OSX' work for me so I
figured this one should too. I've tried a number of different
parameters and nothing seems to be drawn to the screen (I can
concurrently draw other things, so it's not a basic drawing issue or
lack of Flip, etc). Is this function implemented for windows?
Furthermore, the help is a bit confusing - it lists the xy parameter
as a 'two-row vector containing the x and y coordinates of the line
ends.' Does this mean each column is a separate vertex in one
continuous line segment, or is each one drawn connected to the center?
Or is every second column the endpoint, while the column before is
the startpoint? I want to be able to draw hundreds of short,
disconnected line segments across the screen, so if there is a better
way to do so, I'm all ears.

('Screen DrawLine' works just fine, but i want to draw lines the same
way as with DrawDots. Would this be fast enough to draw, say, 2000
lines at 60 Hz?)

Thanks,
Scott
2
I can only add that i couldn't get it working on OSX recently. I wasn't sure how to do it
either. But since I only had to draw a couple of lines, I went the easy way, and used
Drawline instead. So it may not be an OS issue. And the scarce help certainly is a universal
issue.....
Gr.
Frans


--- In psychtoolbox@yahoogroups.com, "stuckdoingwork" <gorlin@...> wrote:
>
> Hi,
>
> I'm having trouble getting Screen DrawLines to work on Windows (latest
> beta update). The other 'OpenGl functions for OSX' work for me so I
> figured this one should too. I've tried a number of different
> parameters and nothing seems to be drawn to the screen (I can
> concurrently draw other things, so it's not a basic drawing issue or
> lack of Flip, etc). Is this function implemented for windows?
> Furthermore, the help is a bit confusing - it lists the xy parameter
> as a 'two-row vector containing the x and y coordinates of the line
> ends.' Does this mean each column is a separate vertex in one
> continuous line segment, or is each one drawn connected to the center?
> Or is every second column the endpoint, while the column before is
> the startpoint? I want to be able to draw hundreds of short,
> disconnected line segments across the screen, so if there is a better
> way to do so, I'm all ears.
>
> ('Screen DrawLine' works just fine, but i want to draw lines the same
> way as with DrawDots. Would this be fast enough to draw, say, 2000
> lines at 60 Hz?)
>
> Thanks,
> Scott
>