Question

Q2 Write a JavaFX program that displays a rectangle with upper-left corner point at (40, 40), width 40, and height 60. Display a circle with radius 30 centered at the mouse point when the mouse is clicked. Display a text to indicate whether the circle contains, intersects, or is outside of the rectangle, as shown in Figure 3. Create the GUI programmatically. DO not use FXML.

Answer 1

import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.input.MouseButton;
import javafx.scene.input.MouseEvent;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;

public class CircleInstersectRectangle extends Application {
  
private Rectangle rectangle;
private Circle circle;
private Label text;
  
private boolean isContaining = false, isIntersecting = false;
  
  
@Override
public void start(Stage primaryStage) {
Group mainGroup = new Group();
Group drawGroup = new Group();
Group textGroup = new Group();
  
text = new Label("None");
  
rectangle = new Rectangle(40, 40, 40, 60);
rectangle.setFill(Color.TRANSPARENT);
rectangle.setStroke(Color.RED);
rectangle.setStrokeWidth(1);
  
textGroup.getChildren().add(text);
drawGroup.getChildren().add(rectangle);
mainGroup.getChildren().addAll(drawGroup, textGroup);
Scene scene = new Scene(mainGroup, 400, 250);
  
scene.addEventHandler(MouseEvent.MOUSE_CLICKED, (MouseEvent mouseEvent) -> {
if (mouseEvent.getButton().equals(MouseButton.PRIMARY)) {
circle = new Circle(mouseEvent.getX(), mouseEvent.getY(), 30, Color.BLUE);
addEventHandler(drawGroup, circle);
drawGroup.getChildren().add(circle);
  
// change the text
int rectCenterX = 60;
int rectCenterY = 70;
if(mouseEvent.getX() == rectCenterX && mouseEvent.getY() == rectCenterY)
{
text.setText("Circle is inside the rectangle!");
}
else if((mouseEvent.getX() + 30 >= 70 && mouseEvent.getX() + 30 <= 110)
&& (mouseEvent.getX() + 30 >= 70 && mouseEvent.getX() + 30 <= 130))
{
text.setText("Circle is intersecting the rectangle!");
}
  
else if((mouseEvent.getX() + 30 < 40 || mouseEvent.getX() + 30 > 110)
&& (mouseEvent.getX() + 30 < 40 || mouseEvent.getX() + 30 > 130))
{
text.setText("Circle is outside the rectangle!");
}
}
});
  
primaryStage.setTitle("Circle & Rectangle!");
primaryStage.setScene(scene);
primaryStage.show();
}
  
public void addEventHandler(Group parent, Node node)
{
node.addEventHandler(MouseEvent.MOUSE_CLICKED, (MouseEvent mouseEvent) -> {
if (mouseEvent.getButton().equals(MouseButton.SECONDARY)) {
parent.getChildren().remove(node);
text.setText("None");
}
});
}

public static void main(String[] args) {
launch(args);
}
  
}