Merge pull request #66 from HarryDulaney/hg-new-solutions

New Solutions for Chapter 15 and 16

Author: HarryDulaney

ch_15/Exercise15_28.java

@@ -26,7 +26,6 @@ public class Exercise15_28 extends Application {
  @Override
  public void start(Stage primaryStage) {
  FanPane fan = new FanPane();
-
  HBox hBox = new HBox(5);
  Button btPause = new Button("Pause");
  Button btResume = new Button("Resume");
@@ -56,66 +55,71 @@ public void start(Stage primaryStage) {
  btReverse.setOnAction(e -> fan.reverse());
  }
 
-}
-
-class FanPane extends Pane {
- private double w = 200;
- private double h = 200;
- private double radius = Math.min(w, h) * 0.45;
- private Arc arc[] = new Arc[4];
- private double startAngle = 30;
- private Circle circle = new Circle(w / 2, h / 2, radius);
-
- public FanPane() {
- circle.setStroke(Color.BLACK);
- circle.setFill(Color.WHITE);
- getChildren().add(circle);
-
- for (int i = 0; i < 4; i++) {
- arc[i] = new Arc(w / 2, h / 2, radius * 0.9, radius * 0.9, startAngle + i * 90, 35);
- arc[i].setFill(Color.RED);
- arc[i].setType(ArcType.ROUND);
- getChildren().addAll(arc[i]);
+ static class FanPane extends Pane {
+ private double w = 200;
+ private double h = 200;
+ private double radius = Math.min(w, h) * 0.45;
+ private Arc arc[] = new Arc[4];
+ private double startAngle = 30;
+ private Circle circle = new Circle(w / 2, h / 2, radius);
+
+ public FanPane() {
+ circle.setStroke(Color.BLACK);
+ circle.setFill(Color.WHITE);
+ getChildren().add(circle);
+
+ for (int i = 0; i < 4; i++) {
+ arc[i] = new Arc(w / 2,
+ h / 2,
+ radius * 0.9,
+ radius * 0.9,
+ startAngle + i * 90,
+ 35);
+ arc[i].setFill(Color.RED);
+ arc[i].setType(ArcType.ROUND);
+ getChildren().addAll(arc[i]);
+ }
  }
- }
 
- private double increment = 5;
+  private double increment = 5;
 
- public void reverse() {
- increment = -increment;
- }
+  public void reverse() {
+  increment = -increment;
+  }
 
- public void move() {
- setStartAngle(startAngle + increment);
- }
+  public void move() {
+  setStartAngle(startAngle + increment);
+  }
 
- public void setStartAngle(double angle) {
- startAngle = angle;
- setValues();
- }
+  public void setStartAngle(double angle) {
+  startAngle = angle;
+  setValues();
+  }
 
- public void setValues() {
- radius = Math.min(w, h) * 0.45;
- circle.setRadius(radius);
- circle.setCenterX(w / 2);
- circle.setCenterY(h / 2);
-
- for (int i = 0; i < 4; i++) {
- arc[i].setRadiusX(radius * 0.9);
- arc[i].setRadiusY(radius * 0.9);
- arc[i].setCenterX(w / 2);
- arc[i].setCenterY(h / 2);
- arc[i].setStartAngle(startAngle + i * 90);
+ public void setValues() {
+ radius = Math.min(w, h) * 0.45;
+ circle.setRadius(radius);
+ circle.setCenterX(w / 2);
+ circle.setCenterY(h / 2);
+
+ for (int i = 0; i < 4; i++) {
+ arc[i].setRadiusX(radius * 0.9);
+ arc[i].setRadiusY(radius * 0.9);
+ arc[i].setCenterX(w / 2);
+ arc[i].setCenterY(h / 2);
+ arc[i].setStartAngle(startAngle + i * 90);
+ }
  }
- }
 
- public void setW(double w) {
- this.w = w;
- setValues();
- }
+  public void setW(double w) {
+  this.w = w;
+  setValues();
+  }
 
- public void setH(double h) {
- this.h = h;
- setValues();
+ public void setH(double h) {
+ this.h = h;
+ setValues();
+ }
  }
+
 }

ch_15/Exercise15_30.java

@@ -0,0 +1,67 @@
+package ch_15;
+
+import javafx.animation.Animation;
+import javafx.animation.KeyFrame;
+import javafx.animation.Timeline;
+import javafx.application.Application;
+import javafx.scene.Scene;
+import javafx.scene.image.Image;
+import javafx.scene.image.ImageView;
+import javafx.scene.layout.StackPane;
+import javafx.stage.Stage;
+import javafx.util.Duration;
+
+import java.io.File;
+
+/**
+ * **15.30 (Slide show) Twenty-five slides are stored as image files (slide0.jpg, slide1
+ * .jpg, . . . , slide24.jpg) in the image directory downloadable along with the
+ * source code in the book. The size of each image is 800 * 600.
+ * <p>
+ * Write a program that automatically displays the slides repeatedly.
+ * Each slide is shown for two seconds. The slides are displayed in order. When the last slide finishes, the
+ * first slide is redisplayed, and so on. Click to pause if the animation is currently
+ * playing. Click to resume if the animation is currently paused
+ * <p>
+ * Note: I used the card images from the book's resources folder instead of the slides as
+ * I could not find the slides.
+ */
+public class Exercise15_30 extends Application {
+ private int index = 0;
+
+ @Override
+ public void start(Stage primaryStage) {
+ Image[] image = new Image[26];
+
+ for (int i = 1; i <= 25; i++) {
+ String imagePath = "resources" + File.separator + "images" +
+ File.separator + "card" + File.separator + i + ".png";
+ image[i] = new Image(imagePath);
+ }
+
+ ImageView imageView = new ImageView(image[0]);
+
+ StackPane pane = new StackPane();
+ pane.getChildren().add(imageView);
+ Scene scene = new Scene(pane, 800, 600);
+ primaryStage.setTitle(getClass().getName());
+ primaryStage.setScene(scene);
+ primaryStage.show();
+
+ Timeline animation = new Timeline(
+ new KeyFrame(Duration.millis(2000), e -> {
+ imageView.setImage(image[++index % 25]);
+ }));
+ animation.setCycleCount(Timeline.INDEFINITE);
+ animation.play();
+
+ pane.setOnMouseClicked(e -> {
+ if (animation.getStatus() == Animation.Status.PAUSED) {
+ animation.play();
+ } else {
+ animation.pause();
+ }
+ });
+ }
+
+}