JavaFX - Rotation Transformation


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In rotation, we rotate the object at a particular angle θ (theta) from its origin. From the following figure, we can see that the point P(X, Y) is located at angle φ from the horizontal X coordinate with distance r from the origin.

Rotation

Example

Following is the program which demonstrates the rotation transformation in JavaFX. In here, we are creating 2 rectangular nodes at the same location, with the same dimensions but with different colors (Blurywood and Blue). We are also applying rotation transformation on the rectangle with Blurywood color.

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

import javafx.application.Application; 
import javafx.scene.Group; 
import javafx.scene.Scene; 
import javafx.scene.paint.Color; 
import javafx.scene.shape.Rectangle; 
import javafx.scene.transform.Rotate; 
import javafx.stage.Stage; 
         
public class RotationExample extends Application { 
   @Override 
   public void start(Stage stage) { 
      //Drawing Rectangle1 
      Rectangle rectangle1 = new Rectangle(150, 75, 200, 150); 
      rectangle1.setFill(Color.BLUE); 
      rectangle1.setStroke(Color.BLACK);  
      
      //Drawing Rectangle2 
      Rectangle rectangle2 = new Rectangle(150, 75, 200, 150); 
      
      //Setting the color of the rectangle 
      rectangle2.setFill(Color.BURLYWOOD); 
      
      //Setting the stroke color of the rectangle 
      rectangle2.setStroke(Color.BLACK); 
       
      //creating the rotation transformation 
      Rotate rotate = new Rotate(); 
      
      //Setting the angle for the rotation 
      rotate.setAngle(20); 
      
      //Setting pivot points for the rotation 
      rotate.setPivotX(150); 
      rotate.setPivotY(225); 
        
      //Adding the transformation to rectangle2 
      rectangle2.getTransforms().addAll(rotate); 
        
      //Creating a Group object
      Group root = new Group(rectangle1, rectangle2); 
         
      //Creating a scene object 
      Scene scene = new Scene(root, 600, 300);  
      
      //Setting title to the Stage 
      stage.setTitle("Rotation transformation 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 RotationExample.java 
java RotationExample

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

Rotation Transformation
javafx_transformations.htm
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