[mapguide-users] Watermarking a Map

[Gary Morin]

Hi Crispin


We need to do the same thing.

I had thought of creating a polygon object to cover the whole region,
adding the watermark as a feature label, style the layer with no fill and
no edge etc. One limitation is you can only use text and the watermark
location is always central, but it does mean the polygon layer can be at
the botton on the display list with the label at the top. This is similar
to your option 4.

In the past with MG6.5 we have used the onViewChanged to update a redline
watermark, I'm sure a similar approach would work here.

Best Reagrds

Gary 

 

-----Original Message-----
From: mapguide-users-bounces at lists.osgeo.org
[mailto:mapguide-users-bounces at lists.osgeo.org] On Behalf Of Crispin @
1Spatial
Sent: 12 September 2008 15:33
To: mapguide-users at lists.osgeo.org
Subject: [mapguide-users] Watermarking a Map


Hi all you clever folk,

Here is Fridays problem - Watermarking a map.  Not in Fusion, just on a
basic layout.
A common situation is to have to add either a copyright notice or other
watermarking/branding to mapping.
Within the MapGuide environment I have come up with some options -
discussion and suggestions welcome...

 1) Open all the raster imagery and watermark it!  Bit brutal and also
does
not account for different scales of mapping based on the same source or
provide ability to always put a copyright notice down in one corner.

 2) Use a low-level WWW service (IIS on Windows) process to intercept the
image and edit before sending it out.  This is "easy" on IIS7/Win2008
apparently due to a new API but I can't get it to happen on lower versions
properly - I watermark the top of the image and truncate the rest.  Plus
this is a Windows only solution could do better:

 3) Add an additional tiled-layer of a standard image overlay.  Create a
complete tile-cache and then replace every tile in the cache with a
transparent watermark image and have that as an overlay to both vector and
raster data.  Can you seed a tile cache tree.  This has the advantage that
is would work for vector as well as raster data but is a bit of a
sledgehammer and also cannot put a notice just on one corner of the map.

 4) Edit the .templ files to include an additional   layer that is turned
on
and off somehow according to scale.  The   would need to be on top of the
map and possibly mess up the mouse interaction but has lots of inherent
advantages in positioning, style, network and server efficiency.

 5) Add to the MapGuide server functionality the ability to have a
scale-dependant overlay image 'layer'.  This layer, defined by a static
image could be cantered, stretched, tiled, or placed in one of the four
corners of the map.  This is then built into the final image rendered by
the
server and is almost essential functionality IMHO.

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