render.scala

import org.geoscript._
import style_new._
import filter.Expression.enrichString 
// import enrichString for spiffy "".cql method, otherwise strings are treated as literals

// alternatively: import org.geotools.filter.text.ecql.ECQL.{ toExpression => cql }
// to use cql("")

val states = layer.Shapefile("geoscript/src/test/resources/data/states.shp")
val theme =
  Label("STATE_ABBR".cql) and
  (Fill("#4DFF4D", opacity=0.7) where "PERSONS <  2e6") and
  (Fill("#FF4D4D", opacity=0.7) where "PERSONS >= 2e6 AND PERSONS <4e6") and
  (Fill("#4D4DFF", opacity=0.7) where "PERSONS >= 4e6") and
  Stroke("black", width="PERSONS/10000000".cql)
val viewport = render.Viewport(states.bounds)
viewport.render(Seq(states -> theme)).writeTo(render.PNG("states.png"))

See http://groups.google.com/group/geoscript/browse_thread/thread/a57d6c7dd34664e5 for the Style discussion thus far.