[mapserver-users] Rendering Challenges

[Lime, Steve D (DNR)]

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.

-- 
Best Regards,
Brent Fraser


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