[Qgis-developer] Getting WGS84 for a point

Barry Rowlingson b.rowlingson at lancaster.ac.uk
Sun May 2 15:01:36 EDT 2010

I'm  trying to sort out the right way of getting from a click on the
map canvas to WGS84 coords for passing to web services that use WGS84
- this is for my clickfu plugin.

Currently the code looks to see if there's a CRS for the project, and
converts the click to WGS84 using a transform based on the project

However if I start a new project and load in a shapefile with, say, an
OSGB CRS set in it's .prj file, my code doesn't do anything special,
doesn't find a project CRS, and so sends google maps a query with
lat=4453500 and lng=6755300.

Perhaps my code should check if the current layer has a CRS and
transform to WGS84 based on that instead of testing for a project CRS?
Or should it do both? Which first? Or am I doing something wrong here?



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