OOP-JAVA Practical 18

• PPS(C)
• JAvA

• Aim: Write a program that moves a circle up, down, left or right using arrow keys.
• Code:

  import javafx.application.Application;
  import javafx.geometry.Insets;
  import javafx.scene.Scene;
  import javafx.scene.layout.Pane;
  import javafx.scene.shape.Circle;
  import javafx.stage.Stage;
  public class practical18 extends Application {
      @Override
      public void start(Stage primaryStage) {
          Pane pane = new Pane();
          pane.setPadding(new Insets(30, 30, 30, 30));
          Circle circle = new Circle(30, 30, 30);
          pane.getChildren().add(circle);
          pane.setOnKeyPressed(e -> {
              switch (e.getCode()) {
                  case UP ->
                      circle.setCenterY(circle.getCenterY()
                              > circle.getRadius() ? circle.getCenterY() - 15
                              : circle.getCenterY());
                  case DOWN ->
                      circle.setCenterY(circle.getCenterY()
                              < pane.getHeight() - circle.getRadius()
                              ? circle.getCenterY() + 15 : circle.getCenterY());
                  case LEFT ->
                      circle.setCenterX(circle.getCenterX()
                              > circle.getRadius() ? circle.getCenterX() - 15
                              : circle.getCenterX());
                  case RIGHT ->
                      circle.setCenterX(circle.getCenterX()
                              < pane.getWidth() - circle.getRadius()
                              ? circle.getCenterX() + 15 : circle.getCenterX());
              }
          });
          Scene scene = new Scene(pane, 300, 300);
          primaryStage.setTitle("practical18");
          primaryStage.setScene(scene);
          primaryStage.show();
          pane.requestFocus();
      }
      public static void main(String[] args) {
          Application.launch(args);
      }
  }

• Output:
  

Practical 17 Practical 19