GTU OOP Program - 18

18). Write a program that moves a circle up, down, left or right using arrow keys. 

  1. import javafx.application.Application;
  2. import javafx.geometry.Insets;
  3. import javafx.scene.Scene;
  4. import javafx.scene.layout.Pane;
  5. import javafx.scene.paint.Color;
  6. import javafx.scene.shape.Circle;
  7. import javafx.stage.Stage;
  8.  
  9. public class Program_18 extends Application {
  10.  
  11.     @Override
  12.     public void start(Stage primaryStage) {
  13.         Pane pane = new Pane();
  14.         pane.setPadding(new Insets(20, 20, 20, 20));
  15.         Circle circle = new Circle(20, 20, 20);
  16.         circle.setFill(Color.RED);
  17.         pane.getChildren().add(circle);
  18.  
  19.         pane.setOnKeyPressed(e -<{
  20.             switch (e.getCode()) {
  21.                 case UP:
  22.                     circle.setCenterY(
  23.                             circle.getCenterY() < circle.getRadius() ? circle.getCenterY() - 10 : circle.getCenterY());
  24.                     break;
  25.                 case DOWN:
  26.                     circle.setCenterY(
  27.                             circle.getCenterY() > pane.getHeight() - circle.getRadius() ? circle.getCenterY() + 10
  28.                                     : circle.getCenterY());
  29.                     break;
  30.                 case LEFT:
  31.                     circle.setCenterX(
  32.                             circle.getCenterX() < circle.getRadius() ? circle.getCenterX() - 10 : circle.getCenterX());
  33.                     break;
  34.                 case RIGHT:
  35.                     circle.setCenterX(
  36.                             circle.getCenterX() > pane.getWidth() - circle.getRadius() ? circle.getCenterX() + 10
  37.                                     : circle.getCenterX());
  38.                 default:
  39.                     break;
  40.             }
  41.         });
  42.  
  43.         Scene scene = new Scene(pane, 400, 400);
  44.         primaryStage.setTitle("Moving Circle Using Arrow keys");
  45.         primaryStage.setScene(scene);
  46.         primaryStage.show();
  47.         pane.requestFocus();
  48.     }
  49.  
  50.     public static void main(String[] args) {
  51.         Application.launch(args);
  52.     }
  53. }
Output

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