dBox / dLegend

[Chip Hankley]

Steve - thanks a lot. That helps a tonne. Even just having this as part
of the list archives will be useful.
 
Thanks again for the dbox interface. That is *incredibly* useful.
 
Chip

>>> Steve Lime <Steve.Lime at DNR.STATE.MN.US> 6/2/2006 12:26 PM >>>

At this point the documentation is pretty sparce, but the demo shows
all the options
at the moment. We developed that capability for a specific project so
there will likely
need to be extensions.

The metadata serves 3 primary functions:

1) it allows the creation of what we call metagroups to collect
similarly themed layers or
groups

In the demo the following metadata does that:

  dlegend_metagroups "foreground,background"
  dlegend_foreground_layers_and_groups
"pls,lakes,dlgstln2,cities,roads"
  dlegend_background_layers_and_groups "drgs,lulc_90cenim3"

The first line tells the parser what groups there are (and what order
to render themin the
legend) and the next two lines define membership.

2) is allows the naming of elements that can't be named with normal
MapServer map
elements. Obviously metagroups since they are not MapServer constructs
cannot be
named. Nor can MapServer groups or layers with more than one named
class. In those
cases we name those elements with metadata:

  dlegend_foreground_name "Foreground Layers:"
  dlegend_background_name "Background Layers:"
  dlegend_lulc_90cenim3_name "Landuse/Landcover"
  dlegend_pls_name "Public Land Survey"
  dlegend_roads_name "Roads"

3) we can alter the legend control element type used for a metagroup,
either a checkbox
or a radio button. Yahoo actually mimics that behavior with DHTML and
css but the effect
is the same as using a form.

  dlegend_background_element "radio"

That's really all there is to it. All other information such as class
names, icons and scale limits
are picked up from the regular mapfile structures.

We have immediate needs to make a couple of extensions such as allowing
nested 
metagroups and setting the default status (open/closed) of a
metagroup.

Let me know if this helps and/or if you need more detail. We can post
this then as documentation
for the MapScript piece of dlegend...

Steve

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