Re: help with graphics

[Michael Goffioul]

On Tue, Oct 25, 2011 at 11:47 PM, John W. Eaton <address@hidden> wrote:
> I'm trying to make the OpenGL renderer do the Matlab compatible thing
> for log plots with all negative data and I'm having some trouble
> understanding where to make the changes.  Would someone be willing to
> give me some pointers?
>
> There were some recent changes to the gnuplot renderer so that it
> could handle negative data for log plots and that seems to mostly
> work, but the way the OpenGL renderer is constructed doesn't seem to
> allow this kind of simple change.  In the gnuplot code, it is OK to
> modify properties in the local copy of the axis_obj structure because
> it is just a copy of the properties.  But the OpenGL code is typically
> working directly with get_X methods, so we have to work with local
> copies of individual data elements, and it seems decisions about what
> to do for log scale plots with negative data have to be made in
> several locations.  Any help with sorting this out would be most
> appreciated.

As I wrote part of that code, I'd be glad to help, but I'm not sure I
understand the problem and what you're trying to achieve. Could you
give me some pointers?

Michael.