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Monday, 26 December 2016

Chapter 15 Exercise 27, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

15.27 (Control a moving text)
Write a program that displays a moving text, as shown in
Figure 15.33a and b. The text moves from left to right circularly.
When it disappears in the right, it reappears from the left.
The text freezes when the mouse is pressed and moves
again when the button is released.


import javafx.animation.FadeTransition;
import javafx.animation.PathTransition;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.scene.text.Text;
import javafx.stage.Stage;
import javafx.util.Duration;

public class Exercise_27 extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception {
        Pane pane = new Pane();
        double width = 400;
        double height = 400;
        Scene scene = new Scene(pane, width, height);
        double radius = Math.min(width, height) * 0.25;
        Circle c = new Circle(width / 2, height / 2, radius, Color.TRANSPARENT);
        c.setRotate(180);
        c.setStroke(Color.BLACK);
        Text text = new Text("Programming is fun");

        PathTransition pathTrans = new PathTransition(Duration.millis(10000), c, text);
        pathTrans.setCycleCount(Timeline.INDEFINITE);
        pathTrans.play();

        FadeTransition fadeTrans = new FadeTransition(Duration.millis(5000), text);
        fadeTrans.setFromValue(1.0);
        fadeTrans.setToValue(0);
        fadeTrans.setAutoReverse(true);
        fadeTrans.setCycleCount(Timeline.INDEFINITE);
        fadeTrans.play();

        pane.setOnMousePressed(e-> {
            pathTrans.pause();
            fadeTrans.pause();
        });
        pane.setOnMouseReleased(e-> {
            pathTrans.play();
            fadeTrans.play();
        });

        pane.getChildren().addAll(text);
        primaryStage.setScene(scene);
        primaryStage.setTitle("Moving text");
        primaryStage.show();
    }


    public static void main(String[] args) {
        Application.launch(args);
    }
}

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