Java语言程序设计 第十六章 （16.22、16.23、16.24、16.25、16.26）

程序小白，希望和大家多交流，共同学习



16.22

//控制一段音频播放的开始，循环和停止
import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.HBox;
import javafx.scene.media.Media;
import javafx.scene.media.MediaPlayer;
import javafx.geometry.Pos;

public class ControlMusic extends Application
{
    @Override
    public void start(Stage primaryStage)
    {
        String str = getClass().getResource("sound/china.mp3").toString();
        Media media = new Media(str);
        MediaPlayer mediaPlayer = new MediaPlayer(media);

        Button btPlay = new Button("Play");
        Button btLoop = new Button("Loop");
        Button btStop = new Button("Stop");

        HBox pane = new HBox(10);
        pane.setAlignment(Pos.CENTER);
        pane.getChildren().addAll(btPlay, btLoop, btStop);

        btPlay.setOnAction(e -> {
            mediaPlayer.play();
            mediaPlayer.setAutoPlay(false);
        });
        btLoop.setOnAction(e -> {
            mediaPlayer.setAutoPlay(true);
        });
        btStop.setOnAction(e -> {
            mediaPlayer.stop();
        });

        Scene scene = new Scene(pane);
        primaryStage.setTitle("ControlMusic");
        primaryStage.setScene(scene);
        primaryStage.show();
    }
}

16.23

//有声的图像动画
import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TextField;
import javafx.scene.control.Label;
import javafx.scene.image.ImageView;
import javafx.scene.image.Image;
import javafx.animation.Timeline;
import javafx.animation.KeyFrame;
import javafx.util.Duration;
import javafx.event.EventHandler;
import javafx.event.ActionEvent;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.GridPane;
import javafx.geometry.Pos;
import javafx.scene.media.Media;
import javafx.scene.media.MediaPlayer;

public class AnimationWithMusic extends Application
{
    private int currentNum = 1;
    private int totalNum = 1;
    private ImageView image = new ImageView();
    private Timeline animation = new Timeline();
    private TextField tfSpeed = new TextField();
    private TextField tfPath = new TextField();
    private TextField tfNumber = new TextField();
    private TextField tfURL = new TextField();
    private String str = getClass().getResource("sound/china.mp3").toString();
    private Media media = new Media(str);
    private MediaPlayer mediaPlayer = new MediaPlayer(media);
    @Override
    public void start(Stage primaryStage)
    {
        //添加文本框
        tfSpeed.setAlignment(Pos.BOTTOM_LEFT);
        tfSpeed.setPrefColumnCount(25);
        tfPath.setAlignment(Pos.BOTTOM_LEFT);
        tfPath.setPrefColumnCount(25);
        tfNumber.setAlignment(Pos.BOTTOM_LEFT);
        tfNumber.setPrefColumnCount(25);
        tfURL.setAlignment(Pos.BOTTOM_LEFT);
        tfURL.setPrefColumnCount(25);
        //控制面板
        GridPane gp = new GridPane();
        gp.add(new Label("Enter information for animation"), 0, 0);
        gp.add(new Label("Animation speed in millisecond"), 0, 1);
        gp.add(tfSpeed, 1, 1);
        gp.add(new Label("Image file prefix"), 0, 2);
        gp.add(tfPath, 1, 2);
        gp.add(new Label("Number of images"), 0, 3);
        gp.add(tfNumber, 1, 3);
        gp.add(new Label("Audio file URL"), 0, 4);
        gp.add(tfURL, 1, 4);
        //添加图像面板
        StackPane sp = new StackPane();
        sp.setPrefSize(400, 300);
        sp.getChildren().add(image);
        //添加按钮
        Button btStart = new Button("Start Animation");
        HBox hb = new HBox();
        hb.setAlignment(Pos.TOP_RIGHT);
        hb.getChildren().add(btStart);

        EventHandler eventHandler = e -> {
            changeImage();
        };

        animation.setCycleCount(Timeline.INDEFINITE);
        btStart.setOnAction(e -> {
            mediaPlayer.stop();
            animation.stop();
            currentNum = 1;
            boolean speed = judgeNum(tfSpeed.getText());
            boolean number = judgeNum(tfNumber.getText());
            boolean path = judgeLetter(tfPath.getText());
            if (number)
            {
                totalNum = Integer.parseInt(tfNumber.getText());
            }
            if (speed)
            {
                animation.getKeyFrames().clear();
                animation.getKeyFrames().add(new KeyFrame(
                    Duration.millis(Double.parseDouble(tfSpeed.getText())), eventHandler));
            }
            if (speed && number && path)
            {
                animation.play();
                changeMusic();
            }

        });

        BorderPane pane = new BorderPane();
        pane.setTop(hb);
        pane.setCenter(sp);
        pane.setBottom(gp);

        Scene scene = new Scene(pane);
        primaryStage.setTitle("AnimationWithMusic");
        primaryStage.setScene(scene);
        primaryStage.show();
    }
    //显示不同的图片
    public void changeImage()
    {
        if (currentNum <= totalNum)
        {
            image.setImage(new Image("image/" + tfPath.getText() + currentNum + ".gif"));
            currentNum++;
        }
        else
            currentNum = 1;
    }
    //判断最大数字的文本框是否正确输入
    public boolean judgeNum(String str)
    {
        if (str.equals(""))
        {
            return false;
        }

        int len = str.length();
        for (int i = 0; i < len; i++)
        {
            if (!Character.isDigit(str.charAt(i)))
            {
                return false;
            }
        }
        return true;
    }
    //判断路径文本框是否正确输入
    public boolean judgeLetter(String str)
    {
        if (str.equals(""))
        {
            return false;
        }

        int len = str.length();
        for (int i = 0; i < len; i++)
        {
            if (!Character.isLetter(str.charAt(i)))
            {
                return false;
            }
        }
        return true;
    }
    //重新设置背景音乐时
    public void changeMusic()
    {
        mediaPlayer.stop();
        String str = getClass().getResource("sound/" + tfURL.getText() + ".mp3").toString();
        media = new Media(str);
        mediaPlayer = new MediaPlayer(media);
        mediaPlayer.play();
    }
}

16.24

//修改后的视频播放器
import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.Slider;
import javafx.scene.control.Button;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;
import javafx.scene.media.Media;
import javafx.scene.media.MediaPlayer;
import javafx.scene.media.MediaView;
import javafx.scene.media.MediaPlayer.Status;
import javafx.geometry.Pos;
import javafx.animation.Timeline;
import javafx.animation.KeyFrame;
import javafx.util.Duration;
import javafx.event.EventHandler;
import javafx.event.ActionEvent;
import javafx.beans.InvalidationListener;
import javafx.beans.Observable;
import javafx.beans.property.DoubleProperty;
import javafx.beans.property.SimpleDoubleProperty;

public class FinalRadioPlay extends Application
{
    private double totalTime = 0;
    private String all = "";
    @Override
    public void start(Stage primaryStage)
    {
        String radio = getClass().getResource("out/longzhou.mp4").toString();
        Media media = new Media(radio);
        MediaPlayer mediaPlayer = new MediaPlayer(media);
        MediaView mediaView = new MediaView(mediaPlayer);
        mediaView.setFitWidth(400);
        mediaView.setFitHeight(400);

        Button btPlay = new Button(">");
        Slider slTime = new Slider();
        slTime.setMax(200);
        Slider slVolume = new Slider();
        slVolume.setMax(200);

        //播放时间和总时间的标签
        long time = (long)media.getDuration().toSeconds();
        //System.out.println(time);
        //System.out.println(getTime(time));
        Label timeInfo = new Label(getTime((long)mediaPlayer.getCurrentTime().toSeconds()) + "/" + getTime(time));
        //各个使用标签
        HBox hb = new HBox(10);
        hb.setAlignment(Pos.CENTER);
        hb.getChildren().addAll(btPlay, new Label("Time"), slTime, timeInfo,
            new Label("Volume"), slVolume);

        //功能实现
        slVolume.setValue(50);
        mediaPlayer.volumeProperty().bind(slVolume.valueProperty().divide(200));
        //显示时间的标签（时间线动画）
        EventHandler eventHandler = e -> {
            double nowTime = (mediaPlayer.getCurrentTime().toSeconds());
            String now = getTime((long)nowTime);
            timeInfo.setText(now + "/" + all);
            if (totalTime != 0)
            {
                slTime.setValue((nowTime / totalTime) * 200.0);
            }
        };

        Timeline animationFotTime = new Timeline(new KeyFrame(Duration.millis(500), 
            eventHandler));
        animationFotTime.setCycleCount(Timeline.INDEFINITE);
        animationFotTime.play();
        //时间滑动条功能实现
//      slTime.valueProperty().addListener(new InvalidationListener(){
//          public void invalidated(Observable o)
//          {
//              double totalTime = media.getDuration().toMillis();
//              double newTime = (slTime.valueProperty().getValue() / 200 * totalTime);
//              mediaPlayer.seek(Duration.millis(newTime));
//          }
//      });
        //按钮功能实现
        btPlay.setOnAction(e -> {
            if (btPlay.getText().equals(">"))
            {
                mediaPlayer.play();
                btPlay.setText("||");
                totalTime = media.getDuration().toSeconds();
                all = getTime((long)totalTime);
            }
            else if (btPlay.getText().equals("||"))
            {
                mediaPlayer.pause();
                btPlay.setText(">");
            }
        });

        BorderPane pane = new BorderPane();
        pane.setCenter(mediaView);
        pane.setBottom(hb);

        Scene scene = new Scene(pane);
        primaryStage.setTitle("RadioPlay");
        primaryStage.setScene(scene);
        primaryStage.show();
    }
    //给定的秒数返回一个小时:分钟:秒的时间格式
    public String getTime(long seconds)
    {
        long currentSecond = seconds % 60;
        long totalMinutes = (long)(seconds / 60);
        long currentMinute = totalMinutes % 60;
        long totalHours = (long)(totalMinutes / 24);
        long currentHour = totalHours % 24;
        //System.out.println("" + currentHour + " " + currentMinute + " " + currentSecond);
        String str = String.format("%02d:%02d:%02d", currentHour, currentMinute, currentSecond);
        return str;
    }
}

16.25

//小车继承Pane
//进行了扩充
//CarPane，使小车可以按照指定的x,y绘制，并且可以加减速，开始暂停，还有定时器
import javafx.scene.shape.Circle;
import javafx.scene.shape.Polygon;
import javafx.collections.ObservableList;
import javafx.scene.shape.Rectangle;
import javafx.scene.paint.Color;
import javafx.scene.shape.Line;
import javafx.animation.PathTransition;
import javafx.animation.Timeline;
import javafx.util.Duration;
import javafx.scene.layout.Pane;

public class CarPane extends Pane
{
    private double x;//起始点x坐标
    private double y;//起始点y坐标
    private double w;//窗体宽度
    private double time;//动画时间
    private PathTransition aRoof;
    private PathTransition aBody;
    private PathTransition aWheel1;
    private PathTransition aWheel2;
    private Polygon roof;
    private Rectangle body; 
    private Circle wheel1; 
    private Circle wheel2;
    private Duration duration;

    public CarPane()
    {
        this(0, 100, 400, 50000);
    }

    public CarPane(double w)
    {
        this(0, 50, w, 50000);
    }

    public CarPane(double x, double y)
    {
        this(x, y, 400, 50000);
    }

    public CarPane(double x, double y, double w, double time)
    {
        this.x = x;
        this.y = y;
        this.time = time;
        this.w = w;
        aRoof = new PathTransition();
        aBody = new PathTransition();
        aWheel1 = new PathTransition();
        aWheel2 = new PathTransition();
        duration = new Duration(time);
        roof = new Polygon();
        body = new Rectangle();
        wheel1 = new Circle();
        wheel2 = new Circle();
        paintCar();
    }
   //设置速度
    public void setRate(double rate)
    {
        aRoof.setRate(rate < 0.0 ? 0.0 : rate);
        aBody.setRate(rate < 0.0 ?  0.0 : rate);
        aWheel1.setRate(rate < 0.0 ? 0.0 : rate);
        aWheel2.setRate(rate < 0.0 ? 0.0 : rate);
    }
    //动画开始
    public void play()
    {
        aRoof.play();
        aBody.play();
        aWheel1.play();
        aWheel2.play();
    }
    //画小车
    public void paintCar()
    {
        //车顶
        roof.setFill(Color.RED);
        roof.setStroke(Color.BLACK);
        ObservableList list = roof.getPoints();
        list.add(x + 10);
        list.add(y - 20);
        list.add(x + 20);
        list.add(y - 30);
        list.add(x + 30);
        list.add(y - 30);
        list.add(x + 40);
        list.add(y - 20);
        Line lR = new Line(x + 25, y - 25, w - 25, y - 25);
        //车体
        body.setX(x);
        body.setY(y - 20);
        body.setWidth(50);
        body.setHeight(10);
        body.setFill(Color.RED);
        body.setStroke(Color.BLACK);
        Line lB = new Line(x + 25, y - 15, w - 25, y - 15);
        //车轮1
        wheel1.setCenterX(x + 15);
        wheel1.setCenterY(y - 5);
        wheel1.setRadius(5);
        wheel1.setFill(Color.BLACK);
        Line lW1 = new Line(x + 15, y - 5, w - 35, y - 5);
        //车轮2
        wheel2.setCenterX(x + 35);
        wheel2.setCenterY(y - 5);
        wheel2.setRadius(5);
        wheel2.setFill(Color.BLACK);
        Line lW2 = new Line(x + 35, y - 5, w - 15, y - 5);

        super.getChildren().addAll(roof, body, wheel1, wheel2);

        aRoof.setDuration(duration);
        aRoof.setPath(lR);
        aRoof.setNode(roof);
        aRoof.setCycleCount(Timeline.INDEFINITE);
        aRoof.play();

        aBody.setDuration(duration);
        aBody.setPath(lB);
        aBody.setNode(body);
        aBody.setCycleCount(Timeline.INDEFINITE);
        aBody.play();

        aWheel1.setDuration(duration);
        aWheel1.setPath(lW1);
        aWheel1.setNode(wheel1);
        aWheel1.setCycleCount(Timeline.INDEFINITE);
        aWheel1.play();

        aWheel2.setDuration(duration);
        aWheel2.setPath(lW2);
        aWheel2.setNode(wheel2);
        aWheel2.setCycleCount(Timeline.INDEFINITE);
        aWheel2.play();
    }
}

//控制小车的面板，同时控制四辆车
import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.paint.Color;
import javafx.scene.control.TextField;
import javafx.scene.layout.VBox;
import javafx.scene.layout.HBox;
import javafx.geometry.Pos;

public class ControlCarPane extends Application 
{
    private CarPane[] cars = new CarPane[4];
    private TextField[] tfCars = new TextField[4];

    @Override
    public void start(Stage primaryStage)
    {
        //初始化文本框和汽车面板
        double w = 500;
        for (int i = 0; i < 4; i++)
        {
            cars[i] = new CarPane(w);
            cars[i].setPrefSize(w, 50);
            cars[i].setStyle("-fx-border-color: black");
        }

        for (int i = 0; i < 4; i++)
        {
            tfCars[i] = new TextField("12");
            tfCars[i].setPrefColumnCount(5);
        }
        //面板功能实现
        tfCars[0].setOnAction(e -> {
            changeRate(0);
        });

        tfCars[1].setOnAction(e -> {
            changeRate(1);
        });

        tfCars[2].setOnAction(e -> {
            changeRate(2);
        });

        tfCars[3].setOnAction(e -> {
            changeRate(3);
        });
        //排版文本框
        HBox hbForTf = new HBox(10);
        hbForTf.setAlignment(Pos.CENTER);
        hbForTf.getChildren().addAll(new Label("Car1:"), tfCars[0],
            new Label("Car2:"), tfCars[1], new Label("Car3:"), tfCars[2],
            new Label("Car4"), tfCars[3]);

        VBox pane = new VBox(10);
        pane.getChildren().addAll(hbForTf, cars[0], cars[1], cars[2], cars[3]);

        Scene scene = new Scene(pane);
        primaryStage.setTitle("ControlCars");
        primaryStage.setScene(scene);
        primaryStage.show();
    }
    //按照文本框的值设置速度
    public void changeRate(int i)
    {
        cars[i].setRate(Double.parseDouble(tfCars[i].getText()));
    }
}

16.26

//升国旗奏国歌
import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.shape.Line;
import javafx.scene.paint.Color;
import javafx.scene.image.ImageView;
import javafx.scene.media.Media;;
import javafx.scene.media.MediaPlayer;
import javafx.animation.PathTransition;
import javafx.animation.Timeline;
import javafx.scene.layout.Pane;
import javafx.util.Duration;

public class RaiseNationalFlag extends Application
{
    @Override
    public void start(Stage primaryStage)
    {
        //设置面板初始值
        Pane pane = new Pane();
        pane.setPrefSize(400, 400);
        //国旗路径
        Line path = new Line(100, 320, 100, 50);
        ImageView flag = new ImageView("image/china.gif");
        //背景音乐
        String str = getClass().getResource("sound/china.mp3").toString();
        Media music = new Media(str);
        MediaPlayer player = new MediaPlayer(music);
        player.play();
        //升旗动画
        PathTransition animation = new PathTransition(Duration.millis(10000), path, flag);
        animation.play();
        //旗杆
        Line line = new Line(30, 380, 30, 10);
        line.setStroke(Color.BLACK);
        line.setFill(Color.BLACK);
        pane.getChildren().addAll(line, flag);

        Scene scene = new Scene(pane);
        primaryStage.setTitle("RaiseNationalFlag");
        primaryStage.setScene(scene);
        primaryStage.show();
    }
}