GeoScript Groovy Building Style Geometry Transformations

GeoScript Groovy Building Geometry Transformations

import geoscript.geom.Bounds
import geoscript.map.Map
import geoscript.workspace.Directory
import geoscript.style.*
import geoscript.filter.Function

def dir = new Directory("/Users/jericks/Downloads/OpenGeo Workshop/data/shp-gs")
def layer = dir.get("nyc_buildings")
layer.style = new Style([
    new PolygonSymbolizer(
        geometry: new Function("offset(the_geom,-6,-6)"),
        fillColor: "black",
        strokeColor: "black",
        strokeWidth: 0.25,
        zIndex: 1
    ),
    new PolygonSymbolizer(
        geometry: new Function("buffer(the_geom,-5)"),
        fillColor: "#333333",
        strokeColor: "#222222",
        strokeWidth: 0.25,
        zIndex: 3
    ),
    new PolygonSymbolizer(
        geometry: "the_geom",
        fillColor: "#E6E6E6",
        strokeColor: "#666666",
        strokeWidth: 0.25,
        zIndex: 2
    )
])

def map = new Map(
    backgroundColor: "white",
    layers: [layer],
    bounds: new Bounds(582724, 4506674, 583896, 4507078)
)
map.render(new File("buildings.png"))