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Commit 8db4552

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Merge pull request #77 from HarryDulaney/chapter-15-solutions
Chapter 15 Exer: 25
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‎README.md

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### I've included links below to all the freely accessible companion material and quick links to navigate through my solutions by chapter.
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### If you would like to contribute, please see: <a href="#contribute">Ways to Contribute</a>
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### See <a href="#contribute">Contribution Guide</a> for coding guidelines and information on how to contribute.
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____
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### <a href="https://media.pearsoncmg.com/ph/esm/ecs_liang_ijp_10/supplement/Supplement1dcodingguidelines.html">Java Coding Style Guidelines</a>
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____
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<span id="contribute"><span/>
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## How to Contribute
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### _Coding Guidelines_
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- #### Solution must use Java 8 SE, as this is the version used by the book.
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- #### Every solution should have a java file containing a public main method for testing it.
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- #### Naming convention is: ExerciseCC_EE.java where CC is the chapter number and EE is the exercise number.
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- #### The public Exercise class containing the main method must include a JavaDoc comment on the class with original exercise question.
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- #### Each solution should be its own self-contained program with minimal dependencies on other files. If you need multiple files please create a package for the exercise.
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- #### ch_XX/exercise22_07/Exercise22_07.java
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- #### This allows us to utilize the Exercise Checking Tool [Exercise Checking Tool](https://liveexample.pearsoncmg.com/CheckExercise/faces/CheckExercise.xhtml?chapter=1&programName=Exercise01_01) to verify solutions.
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- ### Example exercise solution:
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```java
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package ch_01;
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/**
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* 1.1 (Display three messages) Write a program that displays Welcome to Java,
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* Welcome to Computer Science, and Programming is fun.
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*/
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public class Exercise01_01 {
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public static void main(String[] args) {
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System.out.println("Welcome to Java");
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System.out.println("Welcome to Computer Science");
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System.out.println("Programming is fun");
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}
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}
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```
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## Contribution Guide:
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### <em id="prs">Pull requests:</em>
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<li><a href="https://github.com/HarryDulaney/intro-to-java-programming/tree/master/ch_15"><strong>Chapter 15
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</strong></a> - Event-Driven Programming and Animations
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<h6>
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Exercises Needed: 23, 25,27,31,33,35
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Exercises Needed: 25,27,31,33,35
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</h6>
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</li><br>
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<li><a href="https://github.com/HarryDulaney/intro-to-java-programming/tree/master/ch_16"><strong>Chapter

‎ch_01/Exercise01_01.java

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*/
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public class Exercise01_01 {
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public static void main(String[] args) {
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System.out.println("Welcome to Java");
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System.out.println("Welcome to Computer Science");
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System.out.println("Programming is fun");

‎ch_15/Exercise15_23.java

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package ch_15;
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import javafx.application.Application;
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import javafx.collections.ObservableList;
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import javafx.scene.Scene;
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import javafx.scene.layout.StackPane;
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import javafx.scene.paint.Color;
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import javafx.scene.shape.Polygon;
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import javafx.scene.text.Font;
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import javafx.scene.text.Text;
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import javafx.scene.text.TextAlignment;
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import javafx.stage.Stage;
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/**
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* *15.23 (Auto resize stop sign) Rewrite Programming Exercise 14.15 so that the stop
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* sign’s width and height are automatically resized when the window is resized.
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*/
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public class Exercise15_23 extends Application {
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double originalWidth = 200, originalHeight = 200;
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double originalFontSize = 42;
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@Override
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public void start(Stage primaryStage) throws Exception {
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StackPane stackPane = new StackPane();
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stackPane.setPrefWidth(originalWidth);
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stackPane.setPrefHeight(originalHeight);
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drawStopSign(stackPane);
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Scene scene = new Scene(stackPane, originalWidth, originalHeight);
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primaryStage.setScene(scene);
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primaryStage.setTitle(getClass().getName());
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primaryStage.setResizable(true);
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primaryStage.show();
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scene.widthProperty().addListener((observable, oldValue, newValue) -> {
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stackPane.setPrefWidth((double) newValue);
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drawStopSign(stackPane);
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});
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scene.heightProperty().addListener((observable, oldValue, newValue) -> {
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stackPane.setPrefHeight((double) newValue);
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drawStopSign(stackPane);
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});
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}
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void drawStopSign(StackPane stackPane) {
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Polygon polygon = new Polygon();
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stackPane.getChildren().clear();
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double width = stackPane.getPrefWidth();
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double height = stackPane.getPrefHeight();
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stackPane.getChildren().add(polygon);
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polygon.setFill(Color.RED);
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polygon.setStroke(Color.RED);
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ObservableList<Double> list = polygon.getPoints();
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double centerX = width / 2, centerY = height / 2;
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double radius = Math.min(width, height) * 0.4;
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// Add points to the polygon list -> divide Math.PI by 8 for Octagon
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for (int i = 0; i < 8; i++) {
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list.add(centerX + radius * Math.cos(2 * i * Math.PI / 8));
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list.add(centerY - radius * Math.sin(2 * i * Math.PI / 8));
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}
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polygon.setRotate(22.5);
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Text text = new Text("STOP");
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text.setTextAlignment(TextAlignment.CENTER);
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text.setFill(Color.WHITE);
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text.setStroke(Color.WHITE);
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text.setFont(Font.font(originalFontSize * Math.min(width, height) / Math.min(originalWidth, originalHeight)));
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stackPane.getChildren().add(text);
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}
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}

‎ch_15/Exercise15_25.java

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package ch_15;
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import javafx.application.Application;
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import javafx.stage.Stage;
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/**
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* **15.25 (Animation: ball on curve) Write a program that animates a ball moving along
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* a sine curve, as shown in Figure 15.32. When the ball gets to the right border,
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* it starts over from the left. Enable the user to resume/pause the animation with
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* a click on the left/right mouse button.
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*/
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public class Exercise15_25 extends Application {
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@Override
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public void start(Stage primaryStage) throws Exception {
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}
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}

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