[mapserver-users] RE: Rendering Challenges - GEOMTRANSFORM

[Stephen Woodbridge]

Bob,

Don't we already have that with:

   LAYER
     NAME "copyright"
     STATUS DEFAULT
     TYPE POINT
     TRANSFORM OFF
     FEATURE
       POINTS 0 -1 END
     END
     CLASS
       COLOR "#000000"
       TEXT "© 2010 iMaptools.com"
       LABEL
         TYPE TRUETYPE
         FONT "arial"
         SIZE 7
         POSITION LR
         OFFSET 0 0
         BUFFER 1
         COLOR "#555555"
         BACKGROUNDCOLOR "#FFFFFF"
         FORCE TRUE
       END
     END
   END

You can put a label anywhere on the view as it is fully addressable in 
pixels.

-Steve W

On 5/13/2011 10:19 AM, Bob Basques wrote:
> All,
>
>
> Ok, now you got me thinking (again) on the ideas (some old threads)
> related to labeling a view. Things like overlay grids, and such. But if
> I understand what has just been built, couldn't some sort of sudo
> geometries that represent a view (BBOX for example) be used to label a
> view and constructs within it? View (BBOX) edge label/stylings and such,
> maybe starting with simpler alignment/justifications for edge labeling
> of a map view? Using these feature labeling options via CGI introduce
> all sorts of ideas about how to use these capabilities for end user
> "view" labeling/styling, that may be separate from the mapping data.
>
>
> bobb
>
>
>
>  >>> "Lime, Steve D (DNR)" <steve.lime at state.mn.us> wrote:
>
> Cool. I committed that patch in trunk in what will be 6.2 if folks are
> interested. I'll add a few other functions too (see ticket #3871).
>
> Regarding other uses, sure it's possible. We'd need to add the
> GEOMTRANSFORM processing to labels and execute it before computing a
> label point.
>
> I've also thought about defining a layer-level GEOMTRANSFORM that would
> alter the original geometry before any processing so all classes and
> styles would be affected and you could query it. ;-)
>
> Your last idea (8) is a bit different. Here's you're talking about a
> drawing effect so we're back into styles, but in this case a label's
> style. Issue here is that a label has two geometries - the point, and
> the bbox(es) so which are you referencing with [shape]? I'm thinking
> that in this context we'd always mean the bbox(es) so you could create a
> buffered convex hull easily and draw it under a label.
>
> Probably should create a couple of tickets...
>
> Steve
>
> -----Original Message-----
> From: Brent Fraser [mailto:bfraser at geoanalytic.com]
> Sent: Thursday, May 12, 2011 10:08 AM
> To: Lime, Steve D (DNR)
> Cc: mapserver-users at lists.osgeo.org
> Subject: Rendering Challenges - GEOMTRANSFORM
>
> Steve,
>
> Thanks to your patch I was able to render thick lines inside polygons
> (http://i56.tinypic.com/1z347yq.jpg).
>
> The solution of using a STYLE with GEOMTRANSFORM got me thinking of
> using the technique to solve some of the labeling challenges:
>
> 2. Place polygon annotation on/inside boundary line
> (http://trac.osgeo.org/mapserver/ticket/1592 point 8.)
> - label the line geometry resulting from GEOMTRANSFORM
> (buffer([shape], -3)) of the original polygon
>
> 5. Place line anno above (or below) when using ANGLE FOLLOW
> - label the line geometry resulting from GEOMTRANSFORM
> (buffer([shape], 5)) of the original line
>
> Currently the LABEL object uses the original geometry. Do you think it
> would be possible to [optionally?] use the GEOMTRANSFORMed geometry?
>
>
> Similarly, would it be possible to have the LABEL's convex hull (or a
> buffer the character boxes?) used as a clipping polygons of the layer's
> geometry to address:
>
> 8. Erase layer's geometry (but not other layers) under label
> - possible syntax: GEOMTRANSFORM ( clip( [labelpoly] ) )
>
> Your thoughts?
>
> --
> Best Regards,
> Brent Fraser
>
>
>
>
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