[mapguide-users] Buffer Creation

[Kenneth Skovhede, GEOGRAF A/S]

Yes, it is possible.

When creating the buffer layer you can add extra columns to the SDF
(you can't use the built-in buffer function, but you can "copy" the code).
In the extra column, you can store the ID or any extra properties that 
you like.
You can even create all the columns from the original item, and store 
all its properties if you like.

To select the item you must update the MgSelection object on the Runtime 
map, and pass in the ID
from the buffer layer object, then refresh the client map.

To select gradient styles, you can alter the LayerDefinition template 
that you apply to the buffer layer
(again, you must buffer manually and not use the built-in method).
The easiest way to set up the layer template, is to make the layer as it 
should appear in
Studio or Maestro, and then save the xml.

Regards, Kenneth Skovhede, GEOGRAF A/S



tejaswi skrev:
> hi 
>
> I am using MGE 2009 + .net for development(IIS 5).
>
> I am creating a buffer of say 1 km on a particular feature selected
> (programmitically).
> Now when i create it the buffer is shown on top of the selected feature on
> the map,the Buffer should be in a selected state initially that i am unable
> to do so.I should not select the buffer manually in the first instance(it
> should be selected).For selecting any object I have to pass the Id of that
> object but in case of buffer there are no properties attached to it or ID
> attached to it.how to go about it.
>
> Also is it possible to give the buffer theme of graident color(from (thick
> color)dark in the center to lighter color as it spreeds) say something like
> a chemical leak.
>
> kindly suggest how to do these things
>
> thanks in Advance
>
> Tejaswi.
>