Thanks to Ian I've been able to resolve this issue. Anser is posted on stack
exchange.
Peter
From: Peter Borissow <peter.boris...@yahoo.com>
To: geotools-gt2-users <geotools-gt2-users@lists.sourceforge.net>
Sent: Sunday, November 30, 2014 9:01 AM
Subject: Re: Saving a map to image
I posted a question on stack exchange:
http://gis.stackexchange.com/questions/123903/how-to-create-a-map-and-save-it-to-an-image-with-geotools
Thanks,Peter
From: Peter Borissow <peter.boris...@yahoo.com>
To: geotools-gt2-users <geotools-gt2-users@lists.sourceforge.net>
Sent: Saturday, November 29, 2014 12:00 PM
Subject: Re: Saving a map to image
After a little trial and error it appears that the map layers must be
reprojected to the viewport. Is that right?
Step 1: Create mapMapContent map = new MapContent();
map.setTitle("World");
Step 2: Set projectionCoordinateReferenceSystem crs = CRS.decode("EPSG:5070");
//Conic projection over US
MapViewport vp = map.getViewport();
vp.setCoordinateReferenceSystem(crs);
Step 3: Add layers to mapCoordinateReferenceSystem mapCRS =
map.getCoordinateReferenceSystem();
map.addLayer(reproject(getPoliticalBoundaries(), mapCRS));
map.addLayer(reproject(getGraticules(), mapCRS));
Step 4: Save imagesaveImage(map, "/temp/graticules.jpg", 800);
From: Peter Borissow <peter.boris...@yahoo.com>
To: geotools-gt2-users <geotools-gt2-users@lists.sourceforge.net>
Sent: Friday, November 28, 2014 6:16 PM
Subject: Saving a map to image
Hello- I am trying to create a simple map and save it to a jpeg file. I
found this tutorial on how to save a MapContent to an image:
http://docs.geotools.org/latest/userguide/library/render/gtrenderer.html
As a test, I did something simple like this:
MapContent map = new MapContent();
map.setTitle("World");
map.addLayer(getGraticules());saveImage(map, "/temp/graticules.jpg", 800);
Works great! However, now I want to reproject the map and clip it to a specific
AOI. Ideally, I was hoping for something like:
map.setBounds(envelope);
map.setCoordinateReferenceSystem(crs);
...but of course these methods don't exist in the MapContent class. Instead, I
see those methods implemented in the MapViewport. Is that what I should use to
reproject and clip the map? Or do I need to reproject and clip individual
layers before I add them to the map?
Thanks in advance,Peter
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