Re: [OctDev] Java/OpenGL-based graphics package for octave

[Michael Goffioul]

On 4/25/07, John W. Eaton <address@hidden> wrote:
> I'm not sure you can just pass the rendering to the children.  The
> stemseries and barseries objects both have type "hggroup" but they are
> apparently distinct objects because they have different properties,
> and some of those properties must affect the way the object is
> displayed.  So it seems to me that each of these objects must have its
> own rendering function otherwise the rendering code for "hggroup"
> would have to know about all possible types of hggroup objets, which
> doesn't seem like a very tidy design.

I don't think so, because the properties of the hggroup somehow translate
automatically into properties of its children. For instance, setting "color" of
a stemseries sets "color" of the stem and marker lines (2 children of the
stemseries); setting "marker" propagates only to the marker line; setting
"xdata" propagates to the stem line (with NaN insertion) and to the marker
line (as-is).
In the end, at rendering-time, the children objects are already correctly
configured such that you don't actually care of the real type of the hggroup.
Rendering the stemseries reduces to rendering the stem and marker lines;
no need to know the "basevalue".

Michael.