Bar Bell

Horizontal line with circles at each end

Here is a program that draws a barbell in the center of the window. As written, the barbell is horizontal.

The barbell consists of a horizontal Line connecting two Circles. These three Nodes are put into a Group referred to by bb. Then that barbell group is made a child of the Group that is the root of the scene graph.

import javafx.application.*;  
import javafx.stage.*;        
import javafx.scene.*;  
import javafx.scene.shape.*; 
import javafx.scene.paint.*;  
 
public class DrawBarBell extends Application
{ 
  
  void addBarBell( Group root, double centerX, double centerY, double size,  double degrees)
  { 
    Group bb = new Group()
    
    // Make a horizontal bar
    Line bar = new Line( centerX-size/2, centerY, centerX+size/2, centerY );
    bar.setStrokeWidth( 8.0 );
    bar.setStroke( Color.SILVER );
    bb.getChildren().add( bar );   // put bar in the barbell Group
    
    // Make a circle
    double radius = size/6.0;
    Circle leftBell  = new Circle( centerX-size/2, centerY, radius, Color.DARKSLATEGREY);
    bb.getChildren().add( leftBell );  // put the circle into the barbell Group
    
    // Make another circle
    Circle rightBell = new Circle( centerX+size/2, centerY, radius, Color.DARKSLATEGREY);
    bb.getChildren().add( rightBell );   // put the circle into the barbell Group
    
    // Put the barbell Group into the Group that is the root of the scene graph
    root.getChildren().add( bb );  
  }
  
  public void start(Stage stage) 
  { 
    double sceneWidth=400, sceneHeight= 300;  
     
    Group  root = new Group( );   
    addBarBell( root, sceneWidth/2, sceneHeight/2, sceneWidth*0.7, 30.0 );
    
    Scene scene = new Scene(root, sceneWidth, sceneHeight, Color.BLANCHEDALMOND ); 
    stage.setTitle("Bar Bell"); 
    stage.setScene(scene); 
    stage.show(); 
  }      

}

Answer:

Bar Bell

QUESTION 14: