Question

Write a JavaFX application that presents a button and a circle. Every

time the button is pushed, the circle should be moved to a new random

location within the window. The main should be in a class and the operation in other class

Answer 1

Circle.java

import javafx.application.Application;

import javafx.event.ActionEvent;

import javafx.event.EventHandler;

import javafx.geometry.Insets;

import javafx.geometry.Pos;

import javafx.scene.Scene;

import javafx.scene.canvas.Canvas;

import javafx.scene.canvas.GraphicsContext;

import javafx.scene.control.Button;

import javafx.scene.layout.BorderPane;

import javafx.scene.layout.HBox;

import javafx.stage.Stage;

public class Circle extends Application {

@Override

public void start(Stage primaryStage) {

try {

Button button = new Button("CLICK ME");

HBox buttonPane = new HBox();

buttonPane.setAlignment(Pos.CENTER);

buttonPane.setPadding(new Insets(10.0));

buttonPane.getChildren().add(button);

Canvas canvas = new Canvas(400, 350);

GraphicsContext gc = canvas.getGraphicsContext2D();

Drawing draw = new Drawing(canvas, gc);

button.setOnAction(new EventHandler<ActionEvent>() {

@Override

public void handle(ActionEvent t) {

draw.drawShapes(gc);

}

});

draw.drawShapes(gc);

BorderPane root = new BorderPane();

root.setBottom(buttonPane);

root.setCenter(canvas);

Scene scene = new Scene(root, 400, 400);

primaryStage.setScene(scene);

primaryStage.show();

} catch (Exception e) {

e.printStackTrace();

}

}

public static void main(String[] args) {

launch(args);

}

}

Drawing.java

import java.util.Random;

import javafx.scene.canvas.Canvas;

import javafx.scene.canvas.GraphicsContext;

import javafx.scene.paint.Color;

public class Drawing {

Canvas canvas;

GraphicsContext gc;

public Drawing(Canvas canvas, GraphicsContext gc) {

super();

this.canvas = canvas;

this.gc = gc;

}

public void drawShapes(GraphicsContext gc) {

Random r = new Random();

gc.setFill(Color.PINK);

gc.setLineWidth(5);

gc.clearRect(0, 0, 400, 350);

gc.fillOval(new Double(r.nextInt(300)), new Double(r.nextInt(300)), 50, 50);

}

}