JavaFX - 3D Shape Cylinder


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A cylinder is a closed solid that has two parallel (mostly circular) bases connected by a curved surface.

It is described by two parameters, namely – the radius of its circular base and the height of the cylinder as shown in the following diagram −

Cylinder

In JavaFX, a cylinder is represented by a class named Cylinder. This class belongs to the package javafx.scene.shape. By instantiating this class, you can create a cylinder node in JavaFX.

This class has 2 properties of the double datatype namely −

  • height − The height of the Cylinder.

  • radius − The radius of the Cylinder.

To draw a cylinder, you need to pass values to these properties by passing them to the constructor of this class. This can be done in the same order at the time of instantiation, as shown in the following program −

Cylinder cylinder = new Cylinder(radius, height);

Or, by using their respective setter methods as follows −

setRadius(value); 
setHeight(value);

Steps to Draw 3D Cylinder

To Draw a Cylinder (3D) in JavaFX, follow the steps given below.

Step 1: Creating a Class

Create a Java class and inherit the Application class of the package javafx.application and implement the start() method of this class as follows −

public class ClassName extends Application {  
   @Override     
   public void start(Stage primaryStage) throws Exception {     
   }    
}

Step 2: Creating a Cylinder

You can create a Cylinder in JavaFX by instantiating the class named Cylinder, which belongs to a package javafx.scene.shape. You can instantiate this class as follows −

//Creating an object of the Cylinder class       
Cylinder cylinder = new Cylinder(); 

Step 3: Setting Properties to the Cylinder

Set the height and radius of the Cylinder using their respective setter as shown below.

//Setting the properties of the Cylinder 
cylinder.setHeight(300.0f); 
cylinder.setRadius(100.0f); 

Step 4: Creating a Group Object

In the start() method, create a group object by instantiating the class named Group, which belongs to the package javafx.scene.

Pass the Cylinder (node) object created in the previous step as a parameter to the constructor of the Group class. This should be done in order to add it to the group as follows −

Group root = new Group(cylinder);

Step 5: Creating a Scene Object

Create a Scene by instantiating the class named Scene, which belongs to the package javafx.scene. To this class, pass the Group object (root) created in the previous step.

In addition to the root object, you can also pass two double parameters representing height and width of the screen along with the object of the Group class as follows.

Scene scene = new Scene(group ,600, 300);

Step 6: Setting the Title of the Stage

You can set the title to the stage using the setTitle() method of the Stage class. This primaryStage is a Stage object, which is passed to the start method of the scene class as a parameter.

Using the primaryStage object, set the title of the scene as Sample Application as follows.

primaryStage.setTitle("Sample Application"); 

Step 7: Adding Scene to the Stage

You can add a Scene object to the stage using the method setScene() of the class named Stage. Add the Scene object prepared in the previous steps using this method as follows.

primaryStage.setScene(scene); 

Step 8: Displaying the Contents of the Stage

Display the contents of the scene using the method named show() of the Stage class as follows.

primaryStage.show(); 

Step 9: Launching the Application

Launch the JavaFX application by calling the static method launch() of the Application class from the main method as follows.

public static void main(String args[]){   
   launch(args);      
}     

Example

The following program shows how to generate a Cylinder using JavaFX. Save this code in a file with the name CylinderExample.java.

import javafx.application.Application; 
import javafx.scene.Group; 
import javafx.scene.Scene; 
import javafx.scene.shape.CullFace; 
import javafx.scene.shape.Cylinder; 
import javafx.stage.Stage;

public class CylinderExample extends Application { 
   @Override 
   public void start(Stage stage) { 
      //Drawing a Cylinder 
      Cylinder cylinder = new Cylinder(); 
         
      //Setting the properties of the Cylinder 
      cylinder.setHeight(300.0f); 
      cylinder.setRadius(100.0f); 
               
      //Creating a Group object  
      Group root = new Group(cylinder); 
         
      //Creating a scene object 
      Scene scene = new Scene(root, 600, 300);  
      
      //Setting title to the Stage 
      stage.setTitle("Drawing a cylinder"); 
         
      //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 CylinderExample.java 
java CylinderExample

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

Drawing 3dCylinder
javafx_3d_shapes.htm
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