JavaFX 2: Change scale in runtime

To change scale (ex. of a Rectangle) in runtime, call setScaleX(double) and setScaleY(double) methods.

In this example, user can press and drag the mouse to change the scale of the rectangle at runtime.

package javafx_transform;

import javafx.application.Application;
import javafx.event.EventHandler;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.input.MouseEvent;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;

/**
 *
 * @web http://java-buddy.blogspot.com/
 */
public class JavaFX_Transform extends Application {

    Rectangle rect;
    double x0, y0;
    
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        launch(args);
    }
    
    @Override
    public void start(Stage primaryStage) {
        primaryStage.setTitle("java-buddy.blogspot.com");
        Group root = new Group();
        Scene scene = new Scene(root, 300, 250);

        rect = new Rectangle(100, 100, Color.RED);
        
        scene.setOnMouseDragged(mouseHandler);
        scene.setOnMousePressed(mouseHandler);

        root.getChildren().add(rect);
        primaryStage.setScene(scene);
        primaryStage.show();
    }
    
    void setScaleRect(double sX, double sY){
        
        rect.setScaleX(sX);
        rect.setScaleY(sY);
        
    }
    
        
    EventHandler<MouseEvent> mouseHandler = new EventHandler<MouseEvent>() {

        @Override
        public void handle(MouseEvent mouseEvent) {
            
            if(mouseEvent.getEventType() == MouseEvent.MOUSE_PRESSED){
                x0 = mouseEvent.getX();
                y0 = mouseEvent.getY();
                setScaleRect(1.0, 1.0);

            }else if(mouseEvent.getEventType() == MouseEvent.MOUSE_DRAGGED){
                double scaleX = ((mouseEvent.getX() - x0) /100) + 1;
                double scaleY = ((mouseEvent.getY() - y0)/100) + 1;
                
                setScaleRect(scaleX, scaleY);

            }
            
        }
    
    };
}