import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.paint.Color;
import javafx.scene.paint.CycleMethod;
import javafx.scene.paint.LinearGradient;
import javafx.scene.paint.Stop;
import javafx.scene.shape.Rectangle;
import javafx.scene.shape.Ellipse;
import javafx.stage.Stage;

public class Test extends Application {
    @Override
    public void start(Stage stage) {
        LinearGradient lg = new LinearGradient(0, 0, 1, 0, true, CycleMethod.NO_CYCLE,
                                               new Stop(0, Color.TRANSPARENT),
                                               new Stop(1, Color.BLUE));
        LinearGradient lg2 = new LinearGradient(0, 0, 1, 0, true, CycleMethod.NO_CYCLE,
                                                new Stop(0, Color.rgb(255, 0, 0, 0.0)),
                                                new Stop(1, Color.BLUE));
        Rectangle r = new Rectangle(25, 25, 100, 100);
        r.setFill(lg);
        Ellipse e = new Ellipse(225, 75, 50, 50);
        e.setFill(lg);
        Rectangle rr = new Rectangle(25, 175, 100, 100);
        rr.setArcWidth(10);
        rr.setArcHeight(10);
        rr.setFill(lg);
        Rectangle r2 = new Rectangle(175, 175, 100, 100);
        r2.setFill(lg2);

        Scene scene = new Scene(new Group(r, e, rr, r2), 300, 300, Color.WHITE);
        stage.setScene(scene);
        stage.show();
    }
}