Re: [Geotools-gt2-users] JMapPane and Images

[Oliver G. <ol...@dr...>]

I plan on posting an acetate layer example in the next couple weeks.
I've been in C++ land these days but my focus will be switching back to Java, GIS, and geotools in the near future.

My example does not have an image import though.  My example will most likely have just a simple line example.






-----Original Message-----
From: "Michael Bedward" <mic...@gm...>
Sent: Thursday, May 27, 2010 11:09pm
To: "S Dille" <sd...@ja...>
Cc: geo...@li...
Subject: Re: [Geotools-gt2-users] JMapPane and Images

Hello,

>    I am relatively new to geotools and I'm looking for a way to display an
> image on the center of a JMapPane in instances where the image does not have
> any grid information associated with it.  Then once the image is placed on
> the center of the map, the user should be able to move, resize, crop, and/or
> georeference it.

At present JMapPane pane connects to a MapContext object which
contains one or more MapLayers, each of which is connected to a vector
or raster data source. JMapPane doesn't have the facility to display
additional graphics. If you want to do that you need to sub-class
JMapPane and override one or both of the methods paintComponent and
onRenderingCompleted.

Another option would be to use a GlassPane over the JMapPane and
display your image on that.

See this link for an example of glass panes...
http://weblogs.java.net/blog/2006/09/20/well-behaved-glasspane

If you go down that route let me know and I'll see if I can help.

Also, if you search the list archives I think you'll find some related
posts from one of our other users (Oliver) about "transparent layer"
or "acetate layer".

But the best solution might be to just wait a little while. There are
plans afoot to rework the MapContext / MapLayer classes and provide
support for something that might be called DrawLayer (or
DirectDrawLayer) to display images and map decorations. I'm hoping
this will be part of the next GeoTools 2.7 milestone release (2.7-M1
in the next month or two).

Michael

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