Bouncing Ball Animation with JavaFX - Java JavaFX

Java examples for JavaFX:Animation

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Description

Bouncing Ball Animation with JavaFX

Demo Code

import javafx.animation.Animation;
import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.stage.Stage;
import javafx.util.Duration;

public class Main extends Application {
  static int dx = 1;
  static int dy = 1;

  public static void main(String[] args) {
    Application.launch(args);/*from  w  ww.j  ava  2  s .com*/
  }

  @Override
  public void start(final Stage primaryStage) {
    Group root = new Group();
    Scene scene = new Scene(root, 433, 312, Color.WHITE);

    primaryStage.setScene(scene);
    primaryStage.show();

    addBouncyBall(scene);
  }

  private void addBouncyBall(final Scene scene) {

    final Circle ball = new Circle(100, 100, 20);
  

    final Group root = (Group) scene.getRoot();
    root.getChildren().add(ball);

    Timeline tl = new Timeline();
    tl.setCycleCount(Animation.INDEFINITE);
    KeyFrame moveBall = new KeyFrame(Duration.seconds(.0200),
        (ActionEvent event) -> {
          double xMin = ball.getBoundsInParent().getMinX();
          double yMin = ball.getBoundsInParent().getMinY();
          double xMax = ball.getBoundsInParent().getMaxX();
          double yMax = ball.getBoundsInParent().getMaxY();

          // Collision - boundaries
        if (xMin < 0 || xMax > scene.getWidth()) {
          dx = dx * -1;
        }
        if (yMin < 0 || yMax > scene.getHeight()) {
          dy = dy * -1;
        }

        ball.setTranslateX(ball.getTranslateX() + dx);
        ball.setTranslateY(ball.getTranslateY() + dy);
      });

    tl.getKeyFrames().add(moveBall);
    tl.play();
  }
}

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