[mapserver-users] Rendering Challenges

[Lime, Steve D (DNR)]

That's were a difference operator might come in handy since you're looking for more of a fill-type effect:

  GEOMTRANSFORM (difference([shape], buffer([shape], -2)))
  
or something like that.

Steve

-----Original Message-----
From: Brent Fraser [mailto:bfraser at geoanalytic.com] 
Sent: Monday, May 09, 2011 5:18 PM
To: Lime, Steve D (DNR)
Cc: mapserver-users at lists.osgeo.org
Subject: Re: [mapserver-users] Rendering Challenges

Steve L.,

   Good point;  I couldn't do any of this in pre-6.0 either!

   I tried the buffer and it worked great (but we might have to work on 
the end-cap types in PDF output)! See http://i52.tinypic.com/2qjc9yv.jpg

Best Regards,
Brent Fraser


On 5/9/2011 2:36 PM, Lime, Steve D (DNR) wrote:
> These aren't specific to 6.0 though- more of a wish list...
>
> Item 1 might be doable in 6.0 as it sits. In 6.0 a style GEOMTRANSFORM is really an expression and I exposed
> the GEOS buffer operator as a proof-of-concept. For example:
>
> STYLE
>    GEOMTRANSFORM (buffer([shape], -2))
>    OUTLINECOLOR 255 0 0
> END
>
> Should generate a single pixel red line on the inside of a polygon shape. You can render it however you'd like.
> Note that a GEOMTRANSFORM is performed AFTER a shape is converted from map to image coordinates so it's effective
> for rendering effects only.
>
> If we exposed a few others you'd be able to do some other interesting things (like fills just inside a line...).
>
> The rest of the ideas are interesting and worthy of discussion.
>
> Steve
>
> -----Original Message-----
> From: mapserver-users-bounces at lists.osgeo.org [mailto:mapserver-users-bounces at lists.osgeo.org] On Behalf Of Brent Fraser
> Sent: Monday, May 09, 2011 2:52 PM
> To: mapserver-users at lists.osgeo.org
> Subject: [mapserver-users] Rendering Challenges
>
>     While testing v6, I can up with the following list of things I
> couldn't do (see http://i56.tinypic.com/8vvprn.png for a graphic):
>
> 1. Render lines inside polygon boundary (with or without opacity)
> 2. Place polygon annotation on/inside boundary line
> (http://trac.osgeo.org/mapserver/ticket/1592 point 8.)
> 3. Rotate anno if required to fit inside a polygon
> 4. Place polygon annotation outside polygon if anno doesn't fit inside
> 5. Place line anno above (or below) when using ANGLE FOLLOW
> 6. Rotate vector symbols to follow lines (a font might work but is a
> pain to create)
> 7. User specified character spacing
> 8. Erase lines (but not other objects) under annotation
>
>     My goal was to use the published shp files
> (http://ftp2.cits.rncan.gc.ca/pub/canvec/50k_shp/092/h/canvec_092h06_shp.zip)
> without modification and see how close I could get to the published PDF
> (http://ftp2.cits.rncan.gc.ca/pub/cantopo/50k_geopdf/092/h/cantopo_092h06_geopdf.zip).
>
>
>     Any suggested rendering techniques are appreciated.  I'll file
> tickets for those problems deemed worthy.
>