JavaFX | Glow Class

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:

Method	Explanation
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

   // 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:

1. 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

   // 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