Question

Write a JavaFX application that draws 10 circles of random radius in random locations. Leave all circles unfilled except for the largest circle which should be filled with a translucent red (30% opaque) . If multiple circles have the same largest size, fill any one of them. Hint: keep track of the largest circle as you generate them, then change fill to red. Thankuou

Answer 1

Please find the code below:

RandomCirclesWithLargestDiff.java

package gui;

import java.util.Random;

import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.stage.Stage;

public class RandomCirclesWithLargestDiff extends Application {
   public static void main(String[] args) {
       launch(args);
   }
   @Override
   public void start(Stage primaryStage) {
       Scene scene = new Scene(new Group(), 1000, 1000);
       Group rowCircle = (Group) scene.getRoot();
       Random rand = new Random();
       Circle largest=null;
       for(int i=0;i<10;i++){
           Circle circle = new Circle(rand.nextInt(1000),rand.nextInt(1000),rand.nextInt(100));
           if(largest==null){
               largest =circle;
           }else if(largest.getRadius()<circle.getRadius()){
               largest = circle;
           }
           circle.setStroke(Color.BLACK);
           circle.setFill(Color.TRANSPARENT);
           rowCircle.getChildren().add(circle);
       }
      
       largest.setOpacity(0.3);
       largest.setFill(Color.RED);
      
       primaryStage.setScene(scene);
       primaryStage.show();
   }
}

output: