Hey all,
Could someone explain the uses of CRS and transforms in the rendering
pipeline? I need a coarse overview of rendering as used by
uDig/streaming Renderer to understand:
(1) how we go from shapefile data to screen data
(2) what CRS's are stored in the rendering system
This is all prep work so I can compose an intro to CRS that will work as
background for a future, more complex discussion of CRS with features
and renderers.
What I really want is a pipeline, from a UTM shapefile (as an example)
to a displayed map on screen where we know what CRS's are in play and
where the transformations are performed. The initial start of the
operations are:
10) Get Shapefile Metadata => CRS used for
geometryAttributeType
20) Get Shapefile coordinates
30) Build a geometry
40) Build a feature
...
?) Create a Renderer (? with a crs?)
?) add the feature to the chain
...
?) transform to projected coordinates (if in lat/long?) ?
...
?) transform to image coordinates
...
?) transform to screen coordinates
If someone could flesh out the chain so I have a working idea of what's
going on, I would appreciate it.
thanks,
adrian
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