Java语言程序设计 第十六章（16.6、16.7、16.8、16.9）

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16.6

//文本域的设置方法
import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.control.TextField;
import javafx.scene.control.Label;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;
import javafx.scene.control.ToggleGroup;
import javafx.scene.control.RadioButton;
import javafx.scene.text.Text;
import javafx.scene.paint.Color;
import javafx.geometry.Pos;

public class ControlTextField extends Application
{
    @Override
    public void start(Stage primaryStage)
    {
        TextField  tfText = new TextField();
        tfText.setPrefColumnCount(20);
        tfText.setEditable(false);
        String str = "JavaFx";
        tfText.setText(str);

        HBox hbText = new HBox(10);
        hbText.getChildren().addAll(new Label("TextField"), tfText);

        RadioButton rbLeft = new RadioButton("Left");
        RadioButton rbCenter = new RadioButton("Center");
        RadioButton rbRight = new RadioButton("Right");

        ToggleGroup group = new ToggleGroup();
        rbLeft.setToggleGroup(group);
        rbCenter.setToggleGroup(group);
        rbRight.setToggleGroup(group);

        TextField tfSize = new TextField();
        tfSize.setPrefColumnCount(2);
        HBox hbChange = new HBox(5);
        hbChange.setAlignment(Pos.CENTER);
        hbChange.getChildren().addAll(rbLeft, rbCenter, rbRight, new Label("TextField Size"), tfSize);

        rbLeft.setOnAction(e -> {
            tfText.setAlignment(Pos.BOTTOM_LEFT);
        });

        rbCenter.setOnAction(e -> {
            tfText.setAlignment(Pos.CENTER);
        });

        rbRight.setOnAction(e -> {
            tfText.setAlignment(Pos.BOTTOM_RIGHT);
        });

        tfSize.setOnAction(e -> {
            Integer size = Integer.parseInt(tfSize.getText());
            tfText.setPrefColumnCount(size);
        });

        BorderPane pane = new BorderPane();
        pane.setTop(hbText);
        pane.setBottom(hbChange);

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

16.7

package setClock.clockPane;

import javafx.scene.layout.Pane;
import javafx.scene.shape.Line;
import javafx.scene.paint.Color;
import javafx.scene.text.Text;
import javafx.scene.shape.Circle;

public class ClockPane extends Pane
{
    private int hour;
    private int minute;
    private int second;

    private double w = 250, h = 250;

    public ClockPane()
    {
        this(0, 0, 0);
    }

    public ClockPane(int hour, int minute, int second)
    {
        this.hour = hour;
        this.minute = minute;
        this.second = second;
        paintClock();
    }

    public void setHour(int hour)
    {
        this.hour = hour;
        paintClock();
    }

    public void setMinute(int minute)
    {
        this.minute = minute;
        paintClock();
    }

    public void setSecond(int second)
    {
        this.second = second;
        paintClock();
    }

    public void setH(double h)
    {
        this.h = h;
        paintClock();
    }

    public void setW(double w)
    {
        this.w = w;
        paintClock();
    }

    public void paintClock()
    {
        double centerX = w / 2;
        double centerY = h / 2;
        double clockRadius = Math.min(h, w) * 0.8 * 0.5;

        Circle circle = new Circle(centerX, centerY, clockRadius);
        circle.setFill(Color.WHITE);
        circle.setStroke(Color.BLACK);
        double lS = clockRadius * 0.8;
        double sDegree = second * Math.PI * 2 / 60;
        Line sL = new Line(centerX, centerY, centerX + lS * Math.sin(sDegree), centerY - lS * Math.cos(sDegree));
        sL.setStroke(Color.RED);

        double lM = clockRadius * 0.65;
        double mDegree = minute * Math.PI * 2 / 60;
        Line mL = new Line(centerX, centerY, centerX + lM * Math.sin(mDegree), centerY - lM * Math.cos(mDegree));
        mL.setStroke(Color.BLUE);

        double lH = clockRadius * 0.6;
        double hDegree = (hour + minute / 60) * Math.PI * 2 / 12;
        Line hL = new Line(centerX, centerY, centerX + lH * Math.sin(hDegree), centerY - lH * Math.cos(hDegree));
        hL.setStroke(Color.GREEN);

        Text text12 = new Text("12");
        text12.setX(centerX - 5);
        text12.setY(centerY - clockRadius + 15);
        Text text3 = new Text("3");
        text3.setX(centerX + clockRadius - 15);
        text3.setY(centerY);
        Text text6 = new Text("6");
        text6.setX(centerX - 3);
        text6.setY(centerY + clockRadius - 5);
        Text text9 = new Text("9");
        text9.setX(centerX - clockRadius + 5);
        text9.setY(centerY);
        this.getChildren().clear();
        this.getChildren().addAll(circle, sL, mL, hL);
        this.getChildren().addAll(text12, text3, text6, text9);
    }
}

package setClock.setTime;

import setClock.clockPane.ClockPane;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.stage.Stage;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;
import javafx.geometry.Pos;
import javafx.beans.Observable;
import javafx.beans.InvalidationListener;

public class SetTime extends Application
{   
    @Override
    public void start(Stage primaryStage)
    {
        //生成设置小时分钟秒的文本域
        TextField tfHour = new TextField();
        tfHour.setPrefColumnCount(5);
        tfHour.setAlignment(Pos.BOTTOM_RIGHT);
        TextField tfMinute = new TextField();
        tfMinute.setPrefColumnCount(5);
        tfMinute.setAlignment(Pos.BOTTOM_RIGHT);
        TextField tfSecond = new TextField();
        tfSecond.setAlignment(Pos.BOTTOM_RIGHT);
        tfSecond.setPrefColumnCount(5);

        ClockPane clock = new ClockPane();
        //添加文本域
        HBox hbSet = new HBox(10);
        hbSet.getChildren().addAll(new Label("Hour"), tfHour, new Label("Minute"), 
            tfMinute, new Label("Seond"), tfSecond);
        hbSet.setAlignment(Pos.CENTER);
        BorderPane pane = new BorderPane();
        pane.setCenter(clock);
        pane.setBottom(hbSet);
        //设置文本域功能
        tfHour.setOnAction(e -> {
            Integer i = Integer.parseInt(tfHour.getText());
            if (i >= 0 && i <= 12)
            {
                clock.setHour(i);
            }
            else
                tfHour.setText("Illegal");
        });

        tfMinute.setOnAction(e -> {
            Integer i = Integer.parseInt(tfMinute.getText());
            if (i >= 0 && i <= 60)
            {
                clock.setMinute(i);
            }
            else
                tfMinute.setText("Illegal");
        });

        tfSecond.setOnAction(e -> {
            Integer i = Integer.parseInt(tfSecond.getText());
            if (i >= 0 && i <= 60)
            {
                clock.setMinute(i);
            }
            else
                tfSecond.setText("Illegal");
        });
        //自动更新钟表的大小
        pane.widthProperty().addListener(new InvalidationListener()
        {
            public void invalidated(Observable o)
            {
                clock.setW(pane.getWidth());
            }
        });

        pane.heightProperty().addListener(new InvalidationListener()
        {
            public void invalidated(Observable o)
            {
                clock.setH(pane.getHeight());
            }
        });

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

16.8

//判断圆形的位置关系
import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.shape.Circle;
import javafx.scene.control.Button;
import javafx.scene.paint.Color;
import javafx.scene.text.Text;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import javafx.scene.layout.Pane;
import javafx.geometry.Pos;
import javafx.geometry.Insets;

public class TwoCircles extends Application
{
    //两个圆的初始位置关系
    Text text = new Text("Two circles interest? NO");
    Circle circle1 = new Circle(50.0, 60.0, 30);
    Circle circle2 = new Circle(180.0, 50.0, 40);


    @Override
    public void start(Stage primaryStage)
    {
        //设置圆的属性
        circle1.setFill(Color.WHITE);
        circle1.setStroke(Color.BLACK);
        circle2.setFill(Color.WHITE);
        circle2.setStroke(Color.BLACK);
        //添加两个圆的面板
        Pane paneForCircles = new Pane();
        paneForCircles.setPrefSize(400, 300);
        paneForCircles.getChildren().addAll(circle1, circle2);
        //添加两个控制面板的面板
        HBox messages = new HBox(10);
            //圆1的控制面板
        GridPane gpCircle1 = new GridPane();
        gpCircle1.setStyle("-fx-border-color: black");
        //gpCircle1.setPadding(new Insets(5, 5, 5, 5));
        TextField tfCenterX1 = new TextField("" + 50.0);
        tfCenterX1.setPrefColumnCount(5);
        tfCenterX1.setAlignment(Pos.BOTTOM_RIGHT);
        TextField tfCenterY1 = new TextField("" + 60.0);
        tfCenterY1.setPrefColumnCount(5);
        tfCenterY1.setAlignment(Pos.BOTTOM_RIGHT);
        TextField tfRadius1 = new TextField("" + 30.0);
        tfRadius1.setPrefColumnCount(5);
        tfRadius1.setAlignment(Pos.BOTTOM_RIGHT);

        gpCircle1.add(new Label("Enter circle1 info:"), 0, 0);
        gpCircle1.add(new Label("CenterX:"), 0, 1);
        gpCircle1.add(tfCenterX1, 1, 1);
        gpCircle1.add(new Label("CneterY"), 0, 2);
        gpCircle1.add(tfCenterY1, 1, 2);
        gpCircle1.add(new Label("Radius"), 0, 3);
        gpCircle1.add(tfRadius1, 1, 3);
            //圆1拖拽动作
        circle1.setOnMouseDragged(e -> {
            circle1.setCenterX(e.getX());
            circle1.setCenterY(e.getY());
            tfCenterX1.setText("" + e.getX());
            tfCenterY1.setText("" + e.getY());
            judgePosition();
        });
        //圆2的控制面板
        GridPane gpCircle2 = new GridPane();
        gpCircle2.setStyle("-fx-border-color: black");
        //gpCircle2.setPadding(new Insets(5, 5, 5, 5));
        TextField tfCenterX2 = new TextField("" + 180.0);
        tfCenterX2.setPrefColumnCount(5);
        tfCenterX2.setAlignment(Pos.BOTTOM_RIGHT);
        TextField tfCenterY2 = new TextField("" + 50.0);
        tfCenterY2.setPrefColumnCount(5);
        tfCenterY2.setAlignment(Pos.BOTTOM_RIGHT);
        TextField tfRadius2 = new TextField("" + 40.0);
        tfRadius2.setPrefColumnCount(5);
        tfRadius2.setAlignment(Pos.BOTTOM_RIGHT);

        gpCircle2.add(new Label("Enter circle2 info:"), 0, 0);
        gpCircle2.add(new Label("CenterX:"), 0, 1);
        gpCircle2.add(tfCenterX2, 1, 1);
        gpCircle2.add(new Label("CneterY"), 0, 2);
        gpCircle2.add(tfCenterY2, 1, 2);
        gpCircle2.add(new Label("Radius"), 0, 3);
        gpCircle2.add(tfRadius2, 1, 3);
            //圆2的拖拽动作
        circle2.setOnMouseDragged(e -> {
            circle2.setCenterX(e.getX());
            circle2.setCenterY(e.getY());
            tfCenterX2.setText("" + e.getX());
            tfCenterY2.setText("" + e.getY());
            judgePosition();
        });

        messages.getChildren().addAll(gpCircle1, gpCircle2);
        //按钮Redraw Circles 的功能
        Button reDraw = new Button("Redraw Circles");
        reDraw.setOnAction(e -> {
            if (tfCenterX1.getText().equals(null))//使用 != null 或 != ""均无效，只能是equals("") 或 equals(null)
            {
                System.out.println("null");
                Double x1 = Double.parseDouble(tfCenterX1.getText());
                circle1.setCenterX(x1);
            }
            if (!tfCenterY1.getText().equals(null))
            {
                Double y1 = Double.parseDouble(tfCenterY1.getText());
                circle1.setCenterY(y1);
            }
            if (!tfRadius1.getText().equals(null))
            {
                Double r1 = Double.parseDouble(tfRadius1.getText());
                circle1.setRadius(r1);  
            }
            if (!tfCenterX2.getText().equals(null))
            {
                Double x2 = Double.parseDouble(tfCenterX2.getText());
                circle2.setCenterX(x2);
            }
            if (!tfCenterY2.getText().equals(null))
            {
                Double y2 = Double.parseDouble(tfCenterY2.getText());
                circle2.setCenterY(y2);
            }
            if (!tfRadius2.getText().equals(null))
            {
                Double r2 = Double.parseDouble(tfRadius2.getText());
                circle2.setRadius(r2);
            }

            judgePosition();
        });

        //排版
        VBox pane = new VBox(10);
        pane.setAlignment(Pos.CENTER);
        pane.getChildren().addAll(text, paneForCircles, messages, reDraw);

        Scene scene = new Scene(pane);
        primaryStage.setScene(scene);
        primaryStage.setTitle("TwoCircles");
        primaryStage.show();
    }
    //判断两个圆的位置
    public void judgePosition()
    {
        double length = distance(circle1.getCenterX(), circle1.getCenterY(),
            circle2.getCenterX(), circle2.getCenterY());
        double r1 = circle1.getRadius();
        double r2 = circle2.getRadius();
        if (length > r1 + r2)
        {
            text.setText("Two circles interest? NO");
        }
        else
            text.setText("Two circles interest? YES");
    }
    //返回两点之间的距离
    public double distance(double x1, double y1, double x2, double y2)
    {
        return Math.sqrt((y2 - y1) * (y2 -y1) + (x2 - x1) * (x2 - x1));
    }
}

16.9

//判断两个矩形之间的位置关系
import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.Pane;
import javafx.scene.layout.VBox;
import javafx.scene.layout.HBox;
import javafx.scene.text.Text;
import javafx.geometry.Pos;
import javafx.geometry.Insets;

public class TwoRectangles extends Application
{
    Text text = new Text("Two rectangles interest? NO");
    Rectangle r1 = new Rectangle(70.0, 20.0, 40.0, 50.0);
    Rectangle r2 = new Rectangle(130.0, 30.0, 50.0, 20.0);
    @Override
    public void start(Stage primaryStage)
    {
        //初始化两个矩形
        r1.setFill(Color.WHITE);
        r1.setStroke(Color.BLACK);
        r2.setFill(Color.WHITE);
        r2.setStroke(Color.BLACK);
        //将矩形加入内置面板
        Pane paneForRectangles = new Pane();
        paneForRectangles.setPrefSize(300, 400);
        paneForRectangles.getChildren().addAll(r1, r2);
        //r1的控制面板
        GridPane gpR1 = new GridPane();
        gpR1.setStyle("-fx-border-corlor: black");
        TextField tfX1 = new TextField("" + 70.0);
        tfX1.setPrefColumnCount(15);
        tfX1.setAlignment(Pos.BOTTOM_RIGHT);
        TextField tfY1 = new TextField("" + 20.0);
        tfY1.setPrefColumnCount(15);
        tfY1.setAlignment(Pos.BOTTOM_RIGHT);
        TextField tfW1 = new TextField("" + 40.0);
        tfW1.setPrefColumnCount(15);
        tfW1.setAlignment(Pos.BOTTOM_RIGHT);
        TextField tfH1 = new TextField("" + 50.0);
        tfH1.setPrefColumnCount(15);
        tfH1.setAlignment(Pos.BOTTOM_RIGHT);
        gpR1.add(new Label("Enter Rectangle 1 info: "), 0, 0);
        gpR1.add(new Label("X:"), 0, 1);
        gpR1.add(tfX1, 1, 1);
        gpR1.add(new Label("Y:"), 0, 2);
        gpR1.add(tfY1, 1, 2);
        gpR1.add(new Label("Width:"), 0, 3);
        gpR1.add(tfW1, 1, 3);
        gpR1.add(new Label("Height:"), 0, 4);
        gpR1.add(tfH1, 1, 4);
            //矩形拖拽
        r1.setOnMouseDragged(e -> {
            r1.setX(e.getX());
            r1.setY(e.getY());
            tfX1.setText("" + e.getX());
            tfY1.setText("" + e.getY());
            judgePosition();
        });
        //r2的控制面板
        GridPane gpR2 = new GridPane();
        gpR2.setStyle("-fx-border-corlor: black");
        TextField tfX2 = new TextField("" + 130.0);
        tfX2.setPrefColumnCount(15);
        tfX2.setAlignment(Pos.BOTTOM_RIGHT);
        TextField tfY2 = new TextField("" + 30.0);
        tfY2.setPrefColumnCount(15);
        tfY2.setAlignment(Pos.BOTTOM_RIGHT);
        TextField tfW2 = new TextField("" + 50.0);
        tfW2.setPrefColumnCount(15);
        tfW2.setAlignment(Pos.BOTTOM_RIGHT);
        TextField tfH2 = new TextField("" + 20.0);
        tfH2.setPrefColumnCount(15);
        tfH2.setAlignment(Pos.BOTTOM_RIGHT);
        gpR2.add(new Label("Enter Rectangle 2 info: "), 0, 0);
        gpR2.add(new Label("X:"), 0, 1);
        gpR2.add(tfX2, 1, 1);
        gpR2.add(new Label("Y:"), 0, 2);
        gpR2.add(tfY2, 1, 2);
        gpR2.add(new Label("Width:"), 0, 3);
        gpR2.add(tfW2, 1, 3);
        gpR2.add(new Label("Height:"), 0, 4);
        gpR2.add(tfH2, 1, 4);
            //矩形拖拽
        r2.setOnMouseDragged(e -> {
            r2.setX(e.getX());
            r2.setY(e.getY());
            tfX2.setText("" + e.getX());
            tfY2.setText("" + e.getY());
            judgePosition();
        });

        HBox hbForControlPane = new HBox(10);
        hbForControlPane.getChildren().addAll(gpR1, gpR2);
        //Redraw Rectangles 按钮功能实现
        Button btRe = new Button("Redraw Rectangles");
        btRe.setOnAction(e -> {
            if (!tfX1.getText().equals(null))
            {
                Double x1 = Double.parseDouble(tfX1.getText());
                r1.setX(x1);
            }

            if (!tfY1.getText().equals(null))
            {
                Double y1 = Double.parseDouble(tfY1.getText());
                r1.setY(y1);
            }

            if (!tfW1.getText().equals(null))
            {
                Double w1 = Double.parseDouble(tfW1.getText());
                r1.setWidth(w1);
            }

            if (!tfH1.getText().equals(null))
            {
                Double h1 = Double.parseDouble(tfH1.getText());
                r1.setHeight(h1);
            }

            if (!tfX2.getText().equals(null))
            {
                Double x2 = Double.parseDouble(tfX2.getText());
                r2.setX(x2);
            }

            if (!tfY2.getText().equals(null))
            {
                Double y2 = Double.parseDouble(tfY2.getText());
                r2.setY(y2);
            }

            if (!tfW2.getText().equals(null))
            {
                Double w2 = Double.parseDouble(tfW2.getText());
                r2.setWidth(w2);
            }

            if (!tfH2.getText().equals(null))
            {
                Double h2 = Double.parseDouble(tfH2.getText());
                r2.setHeight(h2);
            }
            judgePosition();
        });

        //排版
        VBox pane = new VBox();
        pane.setAlignment(Pos.CENTER);
        pane.getChildren().addAll(text, paneForRectangles, hbForControlPane, btRe);

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

    //判断矩形位置关系
    public void judgePosition()
    {
        double x1 = r1.getX();
        double y1 = r1.getY();
        double w1 = r1.getWidth();
        double h1 = r1.getHeight();
        double x2 = r2.getX();
        double y2 = r2.getY();
        double w2 = r2.getWidth();
        double h2 = r2.getHeight();
        if ((x1 + w1 < x2) ||(x1 + h1 < y2) || (x1 > x1 + w1) || (y2 > y1 + h1))
        {
            text.setText("Two rectangles interest? No");
        }
        else
            text.setText("Two rectangles interest? Yes");
    }
}