java基础：14.5 Java FX之设计时钟

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ClockPane.java

package DesignClock;

import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.scene.shape.Line;
import javafx.scene.text.Text;
import java.util.Calendar;
import java.util.GregorianCalendar;

public class ClockPane extends Pane{
    private int hour;
    private int minute;
    private int second;
    
    //clock pane's width and height
    private double w=250,h=250;

    public ClockPane() {
        setCurrentTime();
    }

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

    public int getHour() {
        return hour;
    }

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

    public int getMinute() {
        return minute;
    }

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

    public int getSecond() {
        return second;
    }

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

    public double getW() {
        return w;
    }

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

    public double getH() {
        return h;
    }

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

    // set the current time for the clock
    public void setCurrentTime() {
    	//// Construct a calendar for the current date and time
        Calendar calendar=new GregorianCalendar();
        this.hour=calendar.get(Calendar.HOUR_OF_DAY);
        this.minute=calendar.get(Calendar.MINUTE);
        this.second=calendar.get(Calendar.SECOND);
        paintClock();
    }

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

        //draw circle
        Circle circle=new Circle(centerX,centerY,clockRadius);
        circle.setFill(Color.WHITE);
        circle.setStroke(Color.BLACK);

        // show the number 3 6 9 12
        Text t1=new Text(centerX-5,centerY-clockRadius+12,"12");
        Text t2=new Text(centerX-clockRadius+3,centerY+5,"9");
        Text t3=new Text(centerX+clockRadius-10,centerY+3,"3");
        Text t4=new Text(centerX-3,centerY+clockRadius-3,"6");

        // endX =  centerX + handLength * sin(x)
        // endY =  centerY - handLength * cos(x)
 
        // second's degree : second x (2pi/60)
        double sLength=clockRadius*0.8;
        double scondX=centerX+sLength*Math.sin(second*(2*Math.PI/60));
        double scondY=centerY-sLength*Math.cos(second*(2*Math.PI/60));
        Line sline=new Line(centerX,centerY,scondX,scondY);
        sline.setStroke(Color.RED);
        
        // minute's degree : (minute + second/60) x (2pi/60)
        double mLength=clockRadius*0.65; 
        double minuteX=centerX+mLength*Math.sin(minute*(2*Math.PI/60));
        double minuteY=centerY-mLength*Math.cos(minute*(2*Math.PI)/60);
        Line mline=new Line(centerX,centerY,minuteX,minuteY);
        mline.setStroke(Color.BLUE);

        // hour's degree   : (hour + minute/60 + second/(60 x 60)) x (2pi/12)
        double hLength=clockRadius*0.5;
        double hourX=centerX+hLength*Math.sin((hour%12+minute/60.0)*(2*Math.PI/12));
        double hourY=centerY-hLength*Math.cos((hour%12+minute/60)*(2*Math.PI/12));
        Line hline=new Line(centerX,centerY,hourX,hourY);
        hline.setStroke(Color.GREEN);

        getChildren().clear();
        getChildren().addAll(circle,t1,t2,t3,t4,sline,mline,hline);

    }
}

DisplayClock.java

package DesignClock;

import javafx.application.Application;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;
import javafx.util.Duration;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.animation.KeyFrame;
import javafx.scene.control.Label;

public class DisplayClock extends Application {
    @Override
    public void start(Stage primaryStage) {
        ClockPane clock=new ClockPane();
        BorderPane borderPane=new BorderPane();

        EventHandler<ActionEvent> eventHandler=e -> {
            clock.setCurrentTime();
            String timeString=clock.getHour()+":"+clock.getMinute()+":"+clock.getSecond();
            Label lblCurrentTime=new Label(timeString);
            borderPane.setCenter(clock);
            borderPane.setBottom(lblCurrentTime);
            BorderPane.setAlignment(lblCurrentTime, Pos.TOP_CENTER);
        };

        Timeline animation=new Timeline(new KeyFrame(Duration.millis(1000),eventHandler));
        animation.setCycleCount(Timeline.INDEFINITE);
        animation.play();

        Scene scene=new Scene(borderPane,250,250);
        primaryStage.setTitle("ClockAnimation");
        primaryStage.setScene(scene);
        primaryStage.show();

        borderPane.widthProperty().addListener(ov ->
            clock.setW(borderPane.getWidth())
        );

        borderPane.heightProperty().addListener(ov ->
            clock.setH(borderPane.getHeight())
        );
    }
    
    public static void main(String[] args) {
    	Application.launch(args);
    }
}