Hi Jeff,
I was thinking about if it would be possible to chart streaming price data
with the new engine. For instance candles that get updated tick by tick as
prices come in. I know from other development tools and charting libraries
that it is very important for speed to have a renderer that does not render
the entire chart, but only the areas that changed.
Would something like that be possible with the new engine?

Regards,

-Mark-

2009/10/23 Jeff Ryan <jeff.a.ryan@gmail.com>

> While this isn't yet in the released version of quantmod, the entire
> graphical engine underlying charting via quantmod is being rewritten.
>
> The net effect is that it will now render as one graphic, so enabling
> the use of charts inside of standard mfcol/layout plot regions, as
> well as a more robust mechanism regarding how additions get appended
> to charts.  Things are much faster and quite a bit more pleasing to
> the eye now.
>
> Another facet of the new engine is that it will allow for base
> graphics to be more easily incorporated _into_ the charts.  I will be
> adding wrappers to make the process easy, but it will be possible even
> without them.  Currently this is a challenge in the current system
> (even for me -- having a decent knowledge of what I wrote.)
>
> I will also add a mechanism to add more common types of additions,
> like signals.  Requests for additional features would be much
> appreciated!!
>
> Brave souls are invited to contact me for access and a quick example
> or two before the release.  All code is on R-forge as well.
>
> Best,
> Jeff
>
>
>
> On Fri, Oct 23, 2009 at 12:21 AM, Wind <windspeedo99@gmail.com> wrote:
> > Stock charts in quantmod are as good as other commercial softwares'.
> > Yet I wonder how to add little arrows to the barChart.   Something as
> > http://www.trendprognosis.com/wp-content/uploads/2009/05/VLE0612.gif
> > Sometimes little arrows are better than shaded area on the charts.
> >  Several kinds of arrows for buy, sell, stop, warning would be enough.
> > Thanks.
> >
> > Wind
> >
> >        [[alternative HTML version deleted]]
> >
> > _______________________________________________
> > R-SIG-Finance@stat.math.ethz.ch mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-sig-finance
> > -- Subscriber-posting only.
> > -- If you want to post, subscribe first.
> >
>
>
>
> --
> Jeffrey Ryan
> jeffrey.ryan@insightalgo.com
>
> ia: insight algorithmics
> www.insightalgo.com
>
> _______________________________________________
> R-SIG-Finance@stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-sig-finance
> -- Subscriber-posting only.
> -- If you want to post, subscribe first.
>

	[[alternative HTML version deleted]]

