Lighting Effect - (Spot Light as Source)


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On applying this effect to a node, a light is simulated on it, as if it is being generated by a spot light.

Spot Light Source − The light from this source attenuates in all directions. The intensity of the light depends on the distance of the object from the source.

Spot Light Source

The class named Light.Spot of the package javafx.scene.effect represents the distant light source. This class contains four properties, which are −

  • pointsAtX − This property is of the type double and it represents the x coordinate of the direction of vector for this light.

  • pointsAtY − This property is of the type double and it represents the y coordinate of the direction of vector for this light.

  • pointsAtZ − This property is of the type double and it represents the z coordinate of the direction of vector for this light.

  • specularExponent − This property is of the type double and it represents the specular exponent, which controls the focus of this light source.

Example

The following program is an example demonstrating the lighting effect of JavaFX. In here, we are drawing a text “Welcome to Tutorialspoint” and a circle in a scene.

To these, we are applying the lighting effect, where the light is being emitted by a spotlight.

Save this code in a file with the name SpotLightExample.java.

import javafx.application.Application; 
import javafx.scene.Group; 
import javafx.scene.Scene;  
import javafx.scene.effect.Light;
import javafx.scene.effect.Lighting; 
import javafx.scene.paint.Color; 
import javafx.scene.shape.Circle; 
import javafx.stage.Stage; 
import javafx.scene.text.Font; 
import javafx.scene.text.FontWeight; 
import javafx.scene.text.Text; 
         
public class SpotLightExample extends Application { 
   @Override 
   public void start(Stage stage) { 
      //Creating a Text object 
      Text text = new Text();       
      
      //Setting font to the text 
      text.setFont(Font.font(null, FontWeight.BOLD, 40));       
      
      //setting the position of the text 
      text.setX(60); 
      text.setY(50); 
      
      //Setting the text to be embedded. 
      text.setText("Welcome to Tutorialspoint");       
      
      //Setting the color of the text 
      text.setFill(Color.RED);   
       
      //Drawing a Circle 
      Circle circle = new Circle();         
      
      //Setting the centre of the circle 
      circle.setCenterX(300.0f); 
      circle.setCenterY(160.0f); 
      
      //Setting the radius of the circle 
      circle.setRadius(100.0f); 
      
      //setting the fill color of the circle  
      circle.setFill(Color.CORNFLOWERBLUE);
      
      //Instantiating the Light.Spot class 
      Light.Spot light = new Light.Spot(); 
      
      //Setting the color of the light 
      light.setColor(Color.GRAY); 
      
      //setting the position of the light 
      light.setX(70); 
      light.setY(55); 
      light.setZ(45); 
       
      //Instantiating the Lighting class  
      Lighting lighting = new Lighting(); 
      
      //Setting the light source 
      lighting.setLight(light);  
      
      //Applying lighting effect to the text 
      text.setEffect(lighting);      
      
      //Applying lighting effect to the circle 
      circle.setEffect(lighting); 
         
      //Creating a Group object  
      Group root = new Group(text,circle);   
               
      //Creating a scene object 
      Scene scene = new Scene(root, 600, 300);  
      
      //Setting title to the Stage 
      stage.setTitle("Spot light effect example"); 
         
      //Adding scene to the stage 
      stage.setScene(scene); 
         
      //Displaying the contents of the stage 
      stage.show();          
   }
   public static void main(String args[]){ 
      launch(args); 
   } 
}   

Compile and execute the saved java file from the command prompt using the following commands.

javac SpotLightExample.java 
java SpotLightExample     

On executing, the above program generates a JavaFX window as shown below.

Light_spot_effect_example
javafx_effects.htm
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