[GT] Re: Re: BuySellArrows.pm Trigger Prices

[Chia-liang Kao <clkao AT clkao.org>]

Hi Robert,

Thanks for looking!

2009/11/13 Robert A. Schmied <ras
AT
acm.org>:
>> Actually, I forgot i did some refactoring on an unfinished branch...
>> see the topic/graphics-improvements branch on my github repo, in
>> particular the commit:
>>
>>
>> http://github.com/clkao/finance-geniustrader/commit/2aab2187c5a8f1468478d92411b0b928093fa603
>>
>> Instead of using the bar high/low directly from prices, it makes the
>> buysellarrow object taking datasource for high/low (which actually
>> means sell/buy arrow positioning) for rendering the arrows.
>>
>> Cheers,
>> CLK
>>
>
> CLK and jon
>
> i evaluated the referenced changes clk made to BuySellArrows, but found the
> changes to the api made it unusable with respect to the original version. in
> addition i also dislike slipping in yet another otherwise unannounced perl
> prerequisite (is it even necessary? meaning is there a way we could avoid
> requiring these versions of min and max?). never the less i've been
> intending to
> query clk to better explain how to use it and request that it be given a
> different name.

First of all, I should have pointed at the branch and diff that is
ported  to CPAN branch:
http://gist.github.com/233510

(you can also fork from:
http://github.com/clkao/finance-geniustrader/tree/CPAN/topic/graphics-improvements)

so right, it was work in progress and it didn't work well yet.  It
might be better to simply converge the two modules and factor out the
same code (having the old prices_ds usage passed for a function taking
high_ds, low_ds).  I think my original intention was for this
graphics::object module to fallback to the old behaviour if only
prices_ds is given.  It depends on how we drive from graphics.pl... In
any case I'd like to see the two modes sharing code base.

And also List::Util has been in perl core since 5.7.3, so it's not
quite an external dependency.

> within this thread jon provided the name so with the hacks i've made since
> and
> just now are included in the newly christened graphic object
> BuySellPricesArrows.
> i've left the keys used to control the colors unchanged, but don't object if
> they are altered to be specifically for BuySellPricesArrows.
>
> if someone can finish it (e.g update pod, correct usage examples, and
> provide
> changes needed to drive it via graphic.pl and or backtest.pl) it could be
> another
> useful graphic object ...
>
>
> aloha
>
> ras
>