On Mon, 02 Feb 2009 21:32:26 -0500 Hazen Babcock <hbabc...@mac.com> wrote:
HB> > The first of these things is the display of so-called candlestick graphs: HB> > HB> > http://en.wikipedia.org/wiki/Candlestick_chart HB> > HB> > This genuinely doesn't seem to be supported as it was requested before: HB> > HB> > http://www.mail-archive.com/plplot-devel@lists.sourceforge.net/msg00650.html HB> > http://www.mail-archive.com/plplot-devel@lists.sourceforge.net/msg00699.html HB> > HB> > but nothing seems to have happened since then. ... HB> Now that it has come up twice we might be more interested :). Probably HB> the first thing would be implement a C function that could create the HB> graph that you wanted. This would likely be done with a number of plline HB> ()/plfill() function calls to draw each point. Thanks for your answer and advice! I've started looking into actually doing something like this and realized that there is actually a third potential problem: is it possible to provide the plot data on demand with PLplot? E.g. with these financial plots you may have data for some market price from 1990 to 2008 with the resolution of one day. Usually the user of the application would just look at some small subrange of this interval, e.g. a couple of last months but I'd like to allow zooming and panning the graph to show more (or less) values and would like to avoid creating all the plot points unnecessarily and only do it when they're about to be shown. Would you have any idea about how could this be done? HB> > The second thing is that I'd like to have some degree of interactivity. ... HB> Most of the interactive drivers support basic interactivity with the HB> function plGetCursor(). I'm not sure if this is what I'm looking for, as I can get the mouse events by directly catching them in wx. I just needed to know how to translate their coordinates to PLplot ones and the post by Hezekiah M. Carty seems to answer this nicely (thanks a lot!). Thanks again, VZ
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