displaying a traditional stock chart - R-SIG-Finance

Wed, Feb 14, 2007 8:33 AM #

Thanks for the feedback, Dirk.

Yes R charts are static.  that's really the main problem, and I'd love
to change that, but doing so would likely incite a lot of resistance
from R-core.

Would love to get something going with Qt, but it looks like SVG might
be best for quick solution.  Tony, let me know if I can help.

Thx,
Whit

-----Original Message-----
From: Dirk Eddelbuettel [mailto:edd at debian.org] 
Sent: Tuesday, February 13, 2007 9:19 PM
To: Armstrong, Whit
Cc: Tony Plate; R-sig-finance
Subject: RE: [R-SIG-Finance] displaying a traditional stock chart

Hi Whit,

On 13 February 2007 at 09:19, Armstrong, Whit wrote:
| I was thinking of an R integrated chart.

But I assume you also both know that the basic R chart is 
static.  There is no way around that. Hence eg Java as an 
alternative for dynamic chart widgets.  Do play with iPlots 
etc example, it is quite nice for the iris example to click 
on one of the species in a factor barplot and automagically 
see the colors change in for the matching group in the scatter plot.

| I assume that that kind of behaviour would require some 
major changes 
| to R internals.  Once nice implementation that I've seen which also

Depends. You can probably also also hack something quickly in 
RGtk2 (try install.packages("rattle") for a very powerful GUI 
in RGtk2) that would just refetch / replot in R. Possibly not 
the quickest solution to run, but possibly the quickest to code.

| preserves the look and feel of R charts is the Rgl package.
| 
| http://rgl.neoscientists.org/gallery.shtml

I found rgl (which I started to package for Debian as soon as it
appeared) to be promising, but hard to use.  IIRC Duncan 
Murdoch recently put another package 'on top of' rgl but I 
haven't looked at it yet.

On to mail nb 2 with the reply to Tony's excellent suggestion 
(and yes, please do make the svg device public)  

On 13 February 2007 at 11:36, Armstrong, Whit wrote:
| That sounds interesting.
[...] 
| It sounds like something like that would be out of the 
question with 
| the SVG device, but for simple operations like zooming in 
and out, or 
| highlighting date ranges SVG could be the way to go.
| 
| Let me know if you would like to pursue this.
| 
| One other solution I have thought about is using 
Trolltech's Qt 4.2, 
| which has nice plotting facilities.  Now that it is available on 
| Windows as well as Linux/Unix it is a viable option. (this 
pdf has a 
| simple graphics view in it, page 2) 
| http://www.trolltech.com/pdf/Qt_42_DS_A4_Web.pdf

I came the same conclusion and started to dabble with Qt and 
in particular Qwt (the related non-Trolltech project for 
scientific widgets).  Qt offers both OpenGL and SVG natively. 
 But so far, I only played with Qt3 functonality.  

Dirk

--
Hell, there are no rules here - we're trying to accomplish something. 
                                                  -- Thomas A. Edison

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