Hi folks, In response to a question on the user list I unearthed some old code for creating hexagonal grids (tesselation of hexagonal polygons) and reworked it for GeoTools 2.7.
As I'm sure you know, hexagonal lattices have that advantage that each cell's immediate neighbours are equidistant. I've used them in the past for ecological simulations. The code can create a lattice as a SimpleFeatureCollection where you control hexagon size and orientation. Here's an example... http://imagebin.org/98114 The code for that is below. Would anyone have any objections to me placing this code in a new unsupported module ? cheers Michael public class HexagonalLattice { public static void main(String[] args) { SimpleFeatureTypeBuilder typeBuilder = new SimpleFeatureTypeBuilder(); typeBuilder.setName("hextype"); typeBuilder.add("hexagon", Polygon.class, (CoordinateReferenceSystem)null); typeBuilder.add("color", Color.class); final SimpleFeatureType TYPE = typeBuilder.buildFeatureType(); final Envelope bounds = new Envelope(0, 100, 0, 100); HexagonAttributeSetter attributeSetter = new HexagonAttributeSetter(TYPE) { public void setAttributes(Hexagon h, Map<String, Object> attributes) { int g = (int) (255 * h.getCenter().x / bounds.getWidth()); int b = (int) (255 * h.getCenter().y / bounds.getHeight()); attributes.put("color", new Color(0, g, b)); } }; final double sideLen = 5.0; SimpleFeatureCollection lattice = Hexagons.createLattice(bounds, sideLen, Orientation.FLAT, attributeSetter); DefaultMapContext map = new DefaultMapContext(); map.addLayer(lattice, createStyle("color")); JMapFrame.showMap(map); } private static Style createStyle(String propName) { FilterFactory2 ff2 = CommonFactoryFinder.getFilterFactory2(null); StyleFactory sf = CommonFactoryFinder.getStyleFactory(null); Stroke stroke = sf.createStroke(ff2.literal(Color.BLACK), ff2.literal(1.0)); Fill fill = sf.createFill(ff2.property(propName)); PolygonSymbolizer sym = sf.createPolygonSymbolizer(stroke, fill, null); return SLD.wrapSymbolizers(sym); } } ------------------------------------------------------------------------------ _______________________________________________ Geotools-devel mailing list Geotools-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/geotools-devel
