Chapter 15 Exer: 25

README.md

@@ -6,7 +6,7 @@
 
 ### I've included links below to all the freely accessible companion material and quick links to navigate through my solutions by chapter.
 
-### If you would like to contribute, please see: <a href="#contribute">Ways to Contribute</a>
+### See <a href="#contribute">Contribution Guide</a> for coding guidelines and information on how to contribute.
 
 ____
 
@@ -41,9 +41,35 @@ object-oriented, GUI programming, advanced GUI and Web programming using Java...
 ### <a href="https://media.pearsoncmg.com/ph/esm/ecs_liang_ijp_10/supplement/Supplement1dcodingguidelines.html">Java Coding Style Guidelines</a>
 
 ____
+
 <span id="contribute"><span/>
+## How to Contribute
+
+### _Coding Guidelines_
+- #### Solution must use Java 8 SE, as this is the version used by the book.
+ - #### Every solution should have a java file containing a public main method for testing it.
+ - #### Naming convention is: ExerciseCC_EE.java where CC is the chapter number and EE is the exercise number.
+ - #### The public Exercise class containing the main method must include a JavaDoc comment on the class with original exercise question.
+ - #### 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.
+ - #### ch_XX/exercise22_07/Exercise22_07.java
+ - #### 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.
+- ### Example exercise solution:
+```java
+package ch_01;
+/**
+* 1.1 (Display three messages) Write a program that displays Welcome to Java,
+* Welcome to Computer Science, and Programming is fun.
+ */
+ public class Exercise01_01 {
+ public static void main(String[] args) {
+ System.out.println("Welcome to Java");
+ System.out.println("Welcome to Computer Science");
+ System.out.println("Programming is fun");
+ }
+
+}
+```
 
-## Contribution Guide:
 
 ### <em id="prs">Pull requests:</em>
 
@@ -132,7 +158,7 @@ Indicates 100% completion of all exercises for that chapter
 <li><a href="https://github.com/HarryDulaney/intro-to-java-programming/tree/master/ch_15"><strong>Chapter 15
 </strong></a> - Event-Driven Programming and Animations
 <h6>
-Exercises Needed: 23, 25, 27,31,33,35
+Exercises Needed: 25,27,31,33,35
 </h6>
 </li><br>
 <li><a href="https://github.com/HarryDulaney/intro-to-java-programming/tree/master/ch_16"><strong>Chapter

ch_01/Exercise01_01.java

@@ -6,7 +6,6 @@
  */
 public class Exercise01_01 {
  public static void main(String[] args) {
-
  System.out.println("Welcome to Java");
  System.out.println("Welcome to Computer Science");
  System.out.println("Programming is fun");

ch_15/Exercise15_23.java

@@ -0,0 +1,73 @@
+package ch_15;
+
+import javafx.application.Application;
+import javafx.collections.ObservableList;
+import javafx.scene.Scene;
+import javafx.scene.layout.StackPane;
+import javafx.scene.paint.Color;
+import javafx.scene.shape.Polygon;
+import javafx.scene.text.Font;
+import javafx.scene.text.Text;
+import javafx.scene.text.TextAlignment;
+import javafx.stage.Stage;
+
+/**
+ * *15.23 (Auto resize stop sign) Rewrite Programming Exercise 14.15 so that the stop
+ * sign’s width and height are automatically resized when the window is resized.
+ */
+public class Exercise15_23 extends Application {
+ double originalWidth = 200, originalHeight = 200;
+ double originalFontSize = 42;
+ @Override
+ public void start(Stage primaryStage) throws Exception {
+ StackPane stackPane = new StackPane();
+ stackPane.setPrefWidth(originalWidth);
+ stackPane.setPrefHeight(originalHeight);
+ drawStopSign(stackPane);
+ Scene scene = new Scene(stackPane, originalWidth, originalHeight);
+ primaryStage.setScene(scene);
+ primaryStage.setTitle(getClass().getName());
+ primaryStage.setResizable(true);
+ primaryStage.show();
+
+ scene.widthProperty().addListener((observable, oldValue, newValue) -> {
+ stackPane.setPrefWidth((double) newValue);
+ drawStopSign(stackPane);
+
+ });
+
+ scene.heightProperty().addListener((observable, oldValue, newValue) -> {
+ stackPane.setPrefHeight((double) newValue);
+ drawStopSign(stackPane);
+ });
+ }
+
+ void drawStopSign(StackPane stackPane) {
+ Polygon polygon = new Polygon();
+ stackPane.getChildren().clear();
+ double width = stackPane.getPrefWidth();
+ double height = stackPane.getPrefHeight();
+ stackPane.getChildren().add(polygon);
+ polygon.setFill(Color.RED);
+ polygon.setStroke(Color.RED);
+
+ ObservableList<Double> list = polygon.getPoints();
+ double centerX = width / 2, centerY = height / 2;
+ double radius = Math.min(width, height) * 0.4;
+ // Add points to the polygon list -> divide Math.PI by 8 for Octagon
+ for (int i = 0; i < 8; i++) {
+ list.add(centerX + radius * Math.cos(2 * i * Math.PI / 8));
+ list.add(centerY - radius * Math.sin(2 * i * Math.PI / 8));
+ }
+ polygon.setRotate(22.5);
+
+ Text text = new Text("STOP");
+ text.setTextAlignment(TextAlignment.CENTER);
+ text.setFill(Color.WHITE);
+ text.setStroke(Color.WHITE);
+ text.setFont(Font.font(originalFontSize * Math.min(width, height) / Math.min(originalWidth, originalHeight)));
+ stackPane.getChildren().add(text);
+
+ }
+
+}

ch_15/Exercise15_25.java

@@ -0,0 +1,17 @@
+package ch_15;
+
+import javafx.application.Application;
+import javafx.stage.Stage;
+
+/**
+ * **15.25 (Animation: ball on curve) Write a program that animates a ball moving along
+ * a sine curve, as shown in Figure 15.32. When the ball gets to the right border,
+ * it starts over from the left. Enable the user to resume/pause the animation with
+ * a click on the left/right mouse button.
+ */
+public class Exercise15_25 extends Application {
+ @Override
+ public void start(Stage primaryStage) throws Exception {
+
+ }
+}