Question

Extra Credit Programming Assignment(7points)Due May 1, midnightWrite a JavaFX application that presents 20 circles, each with a random radius and location. If a circle does not overlap any other circle, fill in the circle with black. Fill in overlapping circles with a translucent blue. Use an array to store the circle objects,and check each new circle to see if it overlaps any previous created circle. Two circles overlap is the distance between their center points is less than the sum of their radii

Answer 1

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Step-by-step explanation:

// CircleOverlap.java

import java.util.Random;

import javafx.application.Application;

import static javafx.application.Application.launch;

import javafx.scene.Scene;

import javafx.scene.layout.Pane;

import javafx.scene.paint.Color;

import javafx.scene.paint.Paint;

import javafx.scene.shape.Circle;

import javafx.stage.Stage;

public class CircleOverlap extends Application {

atOverride //Replace the at with at symbol

public void start(Stage primaryStage) {

//creating a Random number generator object

Random random = new Random();

//setting window size

int windowWidth = 500;

int windowHeight = 500;

//initializing array of circles

Circle array[] = new Circle[20];

//looping for 20 times

for (int i = 0; i < array.length; i++) {

//generating a value between 10 and 50 for radius

int radius = random.nextInt(41) + 10;

//generating a random x,y coordinates, ensuring that the circle fits

//within the window

int centerX = random.nextInt(windowWidth - 2 * radius) + radius;

int centerY = random.nextInt(windowHeight - 2 * radius) + radius;

//creating Circle object

Circle circle = new Circle();

circle.setCenterX(centerX);

circle.setCenterY(centerY);

circle.setRadius(radius);

//adding to array

array[i] = circle;

//flag to check if circle is overlapping any previous circle

boolean isOverlapping = false;

//looping through the previous circles to see if they are overlapping

for (int j = 0; j < i; j++) {

//finding x, y and radius of current circle under check

double x2 = array[j].getCenterX();

double dx = x2 - centerX;

double y2 = array[j].getCenterY();

double dy = y2 - centerY;

double r2 = array[j].getRadius();

//finding distance between this circle and the circle under check

double distance = Math.sqrt((dx * dx) + (dy * dy));

//checking if distance<radius1+radius2

if (distance <= (radius + r2)) {

//overlapping, setting transclucent blue color

Paint c = new Color(0, 0, 1.0, 0.3);

array[i].setFill(c);

isOverlapping = true;

//also changing the color of other circle

array[j].setFill(c);

}

}

if (!isOverlapping) {

//not overlapping, setting black color

array[i].setFill(Color.BLACK);

}

}

//creating a pane and adding all circles

Pane root = new Pane();

root.getChildren().addAll(array);

Scene scene = new Scene(root, windowWidth, windowHeight);

primaryStage.setScene(scene);

primaryStage.setTitle("");

primaryStage.show();

}

public static void main(String[] args) {

launch(args);

}

}