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JavaFX | Glow Class
  • Last Updated : 20 Aug, 2018

Glow class is a part of JavaFX. Glow is a high-level effect that makes the input image appear to glow using a configurable threshold. Glow class inherits Effect class.

Constructors of the class:

  1. Glow(): Creates a new glow object with default parameters.
  2. Glow(double l): Creates a new instance of Glow with specified level.

Commonly Used Methods:

MethodExplanation
getInput()Returns the value of property input
setInput(Effect v)Sets the value of property input
setLevel(double v)Set the value of level of glow object
getLevel()Returns the value of level of glow object

Below programs illustrate the use of the Glow class:

  1. Java Program to add a image and add Glow effect to it: In this program a FileInputStream is created and an image is taken as input from a file. Image named image is created using the input from the file input stream. From the image, an image view object is created and it is added to the VBox. The VBox is then added to the scene and the scene is added to the stage. A Glow effect is created with a specified level passed as parameters and the effect is set to the image view using setEffect() function.




    // Java Program to add a image and 
    // add Glow effect to it.
    import javafx.application.Application;
    import javafx.scene.Scene;
    import javafx.scene.control.*;
    import javafx.scene.layout.*;
    import javafx.stage.Stage;
    import javafx.scene.image.*;
    import javafx.scene.effect.*;
    import java.io.*;
    import javafx.event.ActionEvent;
    import javafx.event.EventHandler;
    import javafx.scene.Group;
       
    public class glow_1 extends Application {
       
        // launch the application
        public void start(Stage stage) throws Exception
        {
       
            // set title for the stage
            stage.setTitle("Glow Example");
       
            // create a input stream
            FileInputStream input = new FileInputStream("D:\\GFG.png");
       
            // create a image
            Image image = new Image(input);
       
            // create a image View
            ImageView imageview = new ImageView(image);
       
            // create a glow effect
            Glow glow = new Glow(0.5);
       
            // set effect
            imageview.setEffect(glow);
       
            // create a VBox
            VBox vbox = new VBox(imageview);
       
            // create a scene
            Scene scene = new Scene(vbox, 200, 200);
       
            // set the scene
            stage.setScene(scene);
       
            stage.show();
        }
       
        // Main Method
        public static void main(String args[])
        {
       
            // launch the application
            launch(args);
        }
    }

    Input Image:



    Output:


  2. Java Program to add an image and add a Glow effect to it, and also add a button to change the glow level: In this program, an FileInputStream is created and an image is taken as input from a file. Image named image is created using the input from the file input stream. From the image, an image view object is created and it is added to the VBox. The VBox is then added to the scene and the scene is added to the stage. A Glow effect is created with a specified level passed as parameters and the effect is set to the image view using setEffect() function. A Button named button is created which is used to increase the glow of the image. The button is also added to the VBox. The glow of the image is increased using the setLevel() function. The events related to the button is handled using EventHandler.




    // Java Program to add a image and
    // add Glow effect to it, and also
    // add a button to change the glow level
    import javafx.application.Application;
    import javafx.scene.Scene;
    import javafx.scene.control.*;
    import javafx.scene.layout.*;
    import javafx.stage.Stage;
    import javafx.scene.image.*;
    import javafx.scene.effect.*;
    import java.io.*;
    import javafx.event.ActionEvent;
    import javafx.event.EventHandler;
    import javafx.scene.Group;
       
    public class glow_2 extends Application {
       
        double level = 0.1;
       
        // launch the application
        public void start(Stage stage) throws Exception
        {
       
            // set title for the stage
            stage.setTitle("Glow Example");
       
            // create a input stream
            FileInputStream input = new FileInputStream("D:\\GFG.png");
       
            // create a image
            Image image = new Image(input);
       
            // create a image View
            ImageView imageview = new ImageView(image);
       
            // create a glow effect
            Glow glow = new Glow(level);
       
            // create a button
            Button button = new Button("Glow");
       
            // action event
            EventHandler<ActionEvent> event = new EventHandler<ActionEvent>() {
       
                public void handle(ActionEvent e)
                {
       
                    // increase the level
                    level += 0.1;
                    if (level > 1)
                        level = 0.0;
       
                    // set Level gor glow
                    glow.setLevel(level);
                }
            };
       
            // set on action of button
            button.setOnAction(event);
       
            // set effect
            imageview.setEffect(glow);
       
            // create a VBox
            VBox vbox = new VBox(imageview, button);
       
            // create a scene
            Scene scene = new Scene(vbox, 200, 200);
       
            // set the scene
            stage.setScene(scene);
       
            stage.show();
        }
       
        // Main Method
        public static void main(String args[])
        {
       
            // launch the application
            launch(args);
        }
    }

    Input Image:

    Output Image:

Note: The above programs might not run in an online IDE. Please use an offline compiler.

Reference: https://docs.oracle.com/javase/8/javafx/api/javafx/scene/effect/Glow.html

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