[mapserver-dev] imagemap outputdriver mapimagemap.c

[Frank Warmerdam]

On 11-04-23 12:51 AM, Doug Willams wrote:
> Hello,
>
> I am working on the outputformat imagemap output driver routines found in
> the mapimagemap.c source file.
>
> For lines and polygons, mapimagemap.c receives a reference to the shape
> object.  I thought the shape object would have many values, either for all
> the data fields or at least for the metadata result_fields defined for the
> layer in the map file.  But there is only one value, for the classitem, in
> the values array.  Can the other data items be accessed?  Is it necessary to
> perform a query to produce a resultcache in order to get the data values?
> Here is how I write the values to a string, to see what is there ... works
> fine, but there is only ever one value, from the classitem field [and the
> index of course].
...
> I must be missing something!  How is the values array properly populated
> with the shape's data field values?

Doug,

MapServer tries to only fetch the field needed for rendering - often just
the classitem - when fetching features for rendering.  Unfortunately I don't
know a way to trick it into fetching all the fields for rendering - perhaps
Steve can suggest something.

Best regards,
-
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I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
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and watch the world go round - Rush    | Geospatial Programmer for Rent