PaintingColors.java

import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.paint.*;
import javafx.scene.shape.Ellipse;
import javafx.scene.shape.Line;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;

import java.util.function.Consumer;

/**
 * Painting Colors
 * @author cdea
 */
public class PaintingColors extends Application {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        Application.launch(args);
    }
    
    @Override
    public void start(Stage primaryStage) {
        primaryStage.setTitle("Painting Colors");
        Group root = new Group();
        Scene scene = new Scene(root, 350, 300, Color.WHITE);
        
        // Red ellipse with radial gradient color
        Ellipse ellipse = new Ellipse(100, // center X
                50 + 70/2, /* center Y */
                50,        /* radius X */
                70/2);     /* radius Y */
        RadialGradient gradient1 = new RadialGradient(
                0,      /* focusAngle */
                .1,   /* focusDistance */
                80,   /* centerX */
                45,   /* centerY */
                120,   /* radius */
                false,      /* proportional */
                CycleMethod.NO_CYCLE,  /* cycleMethod */
                new Stop(0, Color.RED), /* stops */
                  new Stop(1, Color.BLACK) 
        );

        ellipse.setFill(gradient1);
        root.getChildren().add(ellipse);
        double ellipseHeight = ellipse.getBoundsInParent()
                                      .getHeight();
        
        // thick black line behind second shape
        Line blackLine = new Line();
        blackLine.setStartX(170);
        blackLine.setStartY(30);
        blackLine.setEndX(20);
        blackLine.setEndY(140);
        blackLine.setFill(Color.BLACK);
        blackLine.setStrokeWidth(10.0f);
        blackLine.setTranslateY(ellipseHeight + 10);
        
        root.getChildren().add(blackLine); 
        
        // A rectangle filled with a linear gradient with a translucent color.
        Rectangle rectangle = new Rectangle();
        rectangle.setX(50);
        rectangle.setY(50);
        rectangle.setWidth(100);
        rectangle.setHeight(70);
        rectangle.setTranslateY(ellipseHeight + 10);

        LinearGradient linearGrad = new LinearGradient(
                0,   /* start X */
                0,   /* start Y */
                0,   /* end X */
                1,   /* end Y */
                true, /* proportional */
                CycleMethod.NO_CYCLE, /* cycle colors stops */
                new Stop(0.1f, Color.rgb(255, 200, 0, .784)),
                new Stop(1.0f, Color.rgb(0, 0, 0, .784)));
        
        rectangle.setFill(linearGrad);
        root.getChildren().add(rectangle); 

        // A rectangle filled with a linear gradient with a reflective cycle.
        Rectangle roundRect = new Rectangle();
        roundRect.setX(50);
        roundRect.setY(50);
        roundRect.setWidth(100);
        roundRect.setHeight(70);
        roundRect.setArcWidth(20);
        roundRect.setArcHeight(20);
        roundRect.setTranslateY(ellipseHeight + 10 + 
                    rectangle.getHeight() + 10);
 
        LinearGradient cycleGrad = new LinearGradient(
                50, /* start X */
                50, /* start Y */
                70, /* end X */
                70, /* end Y */
                false, /* proportional */
                CycleMethod.REFLECT,  /* cycleMethod */
                new Stop(0f, Color.rgb(0, 255, 0, .784)),
                new Stop(1.0f, Color.rgb(0, 0, 0, .784))
        );
        
        roundRect.setFill(cycleGrad);
        root.getChildren().add(roundRect);

        primaryStage.setScene(scene);
        primaryStage.show();
        Consumer<Integer> r = System.out::println;
    }
}