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Commit 676d224

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add 27 + 31
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‎README.md‎

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@@ -158,7 +158,7 @@ Indicates 100% completion of all exercises for that chapter
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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: 25,27,31,33,35
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Exercises Needed: 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_15/Exercise15_27.java‎

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package ch_15;
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import javafx.animation.PathTransition;
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import javafx.animation.Timeline;
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import javafx.application.Application;
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import javafx.scene.Scene;
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import javafx.scene.layout.Pane;
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import javafx.scene.shape.Line;
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import javafx.scene.text.Text;
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import javafx.stage.Stage;
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import javafx.util.Duration;
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/**
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* *15.27 (Control a moving text) Write a program that displays a moving text, as shown
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* in Figure 15.33a and b. The text moves from left to right circularly. When it
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* disappears in the right, it reappears from the left. The text freezes when the
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* mouse is pressed and moves again when the button is released.
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*/
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public class Exercise15_27 extends Application {
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@Override
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public void start(Stage primaryStage) {
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Pane pane = new Pane();
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Text text = new Text("Programing is fun");
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pane.getChildren().add(text);
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PathTransition pt = new PathTransition(Duration.millis(10000),
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new Line(-50, 50, 250, 50), text);
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pt.setCycleCount(Timeline.INDEFINITE);
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pt.play();
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pane.setOnMousePressed(e -> pt.pause());
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pane.setOnMouseReleased(e -> pt.play());
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Scene scene = new Scene(pane, 200, 100);
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primaryStage.setTitle("Exercise_15_27");
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primaryStage.setScene(scene);
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primaryStage.show();
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}
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}

‎ch_15/Exercise15_31.java‎

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package ch_15;
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import javafx.animation.PathTransition;
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import javafx.application.Application;
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import javafx.scene.Scene;
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import javafx.scene.layout.Pane;
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import javafx.scene.paint.Color;
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import javafx.scene.shape.Arc;
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import javafx.scene.shape.Circle;
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import javafx.scene.shape.Line;
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import javafx.stage.Stage;
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import javafx.util.Duration;
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/**
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* **15.31 (Geometry: pendulum) Write a program that animates a pendulum swinging,
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* as shown in Figure 15.35. Press the UP arrow key to faster the speed and the
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* DOWN key to slower it. Press the S key to stop animation and the R key to
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* resume it.
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*/
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public class Exercise15_31 extends Application {
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private final double sceneWidth = 400;
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private final double sceneHeight = 400;
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@Override
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public void start(Stage primaryStage) throws Exception {
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PendulumPane pendulumPane = new PendulumPane(sceneWidth, sceneHeight);
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Scene scene = new Scene(pendulumPane, sceneWidth, sceneHeight);
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primaryStage.setTitle(getClass().getName());
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primaryStage.setScene(scene);
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primaryStage.show();
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pendulumPane.play();
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scene.setOnKeyPressed(e -> {
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switch (e.getCode()) {
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case UP:
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pendulumPane.faster();
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break;
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case DOWN:
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pendulumPane.slower();
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break;
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}
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});
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}
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}
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class PendulumPane extends Pane {
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PathTransition animationPath;
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Circle referenceCircleTop;
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Circle referenceCircleBottom;
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Line shaft;
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Arc pendulumSwingArc;
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PendulumPane(double width, double height) {
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setPrefWidth(width);
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setPrefHeight(height);
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pendulumSwingArc = new Arc(width / 2,
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height * 0.8,
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width * 0.15,
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width * 0.15,
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180,
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180);
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pendulumSwingArc.setFill(Color.TRANSPARENT);
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pendulumSwingArc.setStroke(Color.BLACK);
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referenceCircleBottom = new Circle(pendulumSwingArc.getCenterX() - pendulumSwingArc.getRadiusX(),
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pendulumSwingArc.getCenterY(),
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10);
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referenceCircleTop = new Circle(pendulumSwingArc.getCenterX(),
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pendulumSwingArc.getCenterY() - height / 2,
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referenceCircleBottom.getRadius() / 2);
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pendulumSwingArc = new Arc(referenceCircleTop.getCenterX(),
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referenceCircleTop.getCenterY(),
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width / 2,
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height / 2,
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240,
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60);
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shaft = new Line(
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referenceCircleTop.getCenterX(), referenceCircleTop.getCenterY(),
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referenceCircleBottom.getCenterX(), referenceCircleBottom.getCenterY());
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shaft.endXProperty().bind(referenceCircleBottom.translateXProperty().add(referenceCircleBottom.getCenterX()));
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shaft.endYProperty().bind(referenceCircleBottom.translateYProperty().add(referenceCircleBottom.getCenterY()));
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animationPath = new PathTransition();
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animationPath.setDuration(Duration.millis(4000));
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animationPath.setPath(pendulumSwingArc);
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animationPath.setNode(referenceCircleBottom);
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animationPath.setOrientation(PathTransition.OrientationType.NONE);
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animationPath.setCycleCount(PathTransition.INDEFINITE);
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animationPath.setAutoReverse(true);
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getChildren().addAll(referenceCircleBottom, referenceCircleTop, shaft);
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}
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public void play() {
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animationPath.play();
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}
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public void faster() {
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animationPath.rateProperty().set(animationPath.getRate() + 1);
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}
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public void slower() {
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animationPath.rateProperty().set(animationPath.getRate() - 1);
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}
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}

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