// Creation d'une grille
import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.GeometryFactory;
import com.vividsolutions.jts.geom.LinearRing;
import com.vividsolutions.jump.feature.*;
import com.vividsolutions.jump.workbench.ui.GUIUtil;
import com.vividsolutions.jump.workbench.ui.MultiInputDialog;

dialog = new MultiInputDialog(wc.workbench.frame, "Paramčtres de la grille", true);
dialog.addDoubleField("Pas de la grille en x", 10000.0, 12);
dialog.addDoubleField("Pas de la grille en y", 10000.0, 12);
GUIUtil.centreOnWindow(dialog);
dialog.setVisible(true);
if (dialog.wasOKPressed()) {
  dx = dialog.getDouble("Pas de la grille en x");
  dy = dialog.getDouble("Pas de la grille en y");
}
else return;

env = wc.layerManager.getEnvelopeOfAllLayers(true);
double xm = Math.floor(env.minX/dx)*dx;
double ym = Math.floor(env.minY/dy)*dy;
double xM = Math.ceil(env.maxX/dx)*dx;
double yM = Math.ceil(env.maxY/dy)*dy;
fs = new FeatureSchema();
fs.addAttribute("GEOMETRY", AttributeType.GEOMETRY);
fs.addAttribute("NUM", AttributeType.STRING);
fs.addAttribute("TYPE", AttributeType.STRING);
ds = new FeatureDataset(fs);
gf = new GeometryFactory();
for (double x = xm ; x <= xM-dx ; x+=dx) {
    for (double y = yM ; y >= ym+dy ; y-=dy) {
        poly = gf.createPolygon(gf.createLinearRing(new Coordinate[]{
            new Coordinate(x, y),
            new Coordinate(x+dx, y),
            new Coordinate(x+dx, y-dy),
            new Coordinate(x, y-dy),
            new Coordinate(x, y),
        }), new LinearRing[0]);
        f = new BasicFeature(fs);
        f.setGeometry(poly);
        f.setAttribute("NUM", ""+x+"-"+y);
        ds.add(f);
    }
}
wc.layerManager.addLayer("Travail", "GRILLE", ds);