All in Java Please

Q1: Raise flag (textbook programming exercises 32.3)

Rewrite the rising flag animation below using a thread to animate the flag being raised.

import javafx.animation.*; import javafx.application.Application; import javafx.scene.Scene; import javafx.scene.image.ImageView; import javafx.scene.layout.Pane; import javafx.scene.shape.Line; import javafx.stage.Stage; import javafx.util.Duration; public class FlagRisingAnimation extends Application { @Override public void start(Stage primaryStage) { Pane pane = new Pane(); ImageView imageView = new ImageView("image/us.gif"); double flagHeight = imageView.getLayoutBounds().getHeight(); Line line = new Line(100, 200+flagHeight/2, 100, -flagHeight/2); pane.getChildren().add(imageView); // pane.getChildren().add(line); PathTransition pt = new PathTransition(Duration.millis(2000), line , imageView); pt.setCycleCount(Timeline.INDEFINITE); pt.play(); Scene scene = new Scene(pane, 250, 200); primaryStage.setTitle("FlagRisingByPathTransition"); primaryStage.setScene(scene); primaryStage.show(); } public static void main(String[] args) { launch(args); } }

Hints

The flag size is 16084 pixel by pixel

The flag moves 200+84 pixels in 2 seconds, i.e. the rising speed is about 7 milliseconds per pixel

or 0.142 pixel per millisecond

so in the thread, the flag is raising 1 pixel in about 7 milliseconds

however, it will move slower than the animation above due to thread scheduling overhead

Could you change the speed to make the flag rise as fast as the animation?

Sample output

Extra credit (10%) Rewrite Q1 with speed adjustment by arrow keys

up arrow key: speed up

down arrow key: slow down