JavaFX实现简易时钟效果(二)

JavaFX实现简易时钟效果(二)

本文实例为大家分享了javaFX实现简易时钟效果的具体代码，供大家参考，具体内容如下

在前一篇博客中，我们已经绘制了一个静止时钟。

绘制简易时钟（一）

首先进行一个微调：让表盘根据窗口大小自动调整大小：

在 ShowClock.start() 中，添加对面板长宽的监听。

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

pane.heightProperty().addListener(ov -> clock.setH(pane.getHeight()));

添加对时间和钟表大小的更改方法

在 ClockPane 类中添加：

/** Construct a clock with specified hour, minute, and second */

public ClockPane(int hour, int minute, int second) {

this.hour = hour;

this.minute = minute;

this.second = second;

paintClock();

}

/** Set a new hour */

public void setHour(int hour) {

this.hour = hour;

paintClock();

}

/** Set a new minute */

public void setMinute(int minute) {

this.minute = minute;

paintClock();

}

/** Set a new second */

public void setSecond(int second) {

this.second = second;

paintClock();

}

/** Return clock pane's width */

public double getW() {

return w;

}

/** Set clock pane's width */

public void setW(double w) {

this.w = w;

paintClock();

}

/** Return clock pane's height */

public double getH() {

return h;

}

/** Set clock pane's height */

public void setH(double h) {

this.h = h;

paintClock();

}

用 Timeline 实现动态钟表

在 ShowClock 类中添加：

//设置事件处理对象

EventHandler eventHandler = e -> {

clock.setCurrentTime();

};

//每秒结束后触发eventHandler

Timeline animation = new Timeline(

new KeyFrame(Duration.millis(1000), eventHandler));

animation.setCycleCount(Timeline.INDEFINITE); //无限循环

animation.play(); //开始动画

就可以让时钟动起来了。

完整代码

ShowClock.java

package primier;

import javafx.application.Application;

import javafx.geometry.Pos;

import javafx.scene.Scene;

import javafx.stage.Stage;

import javafx.scene.layout.*;

import javafx.scene.control.*;

import javafx.event.ActionEvent;

impziWfGort javafx.event.EventHandler;

import javafx.util.Duration;

import javafx.animation.KeyFrame;

import javafx.animation.Timeline;

public class ShowClock extends Application {

@Override //Override the start method in the Application class

public void start(Stage primaryStage) {

ClockPane clock = new ClockPane();

//设置事件处理对象

EventHandler eventHandler = e -> {

clock.setCurrentTime();

};

//每秒结束后触发eventHandler

Timeline animation = new Timeline(

new KeyFrame(Duration.millis(1000), eventHandler));

animation.setCycleCount(Timeline.INDEFINITE); //无限循环

animation.play(); //开始动画

BorderPane pane = new BorderPane();

pane.setCenter(clock);

Scene scene = new Scene(pane, 250,250);

primaryStage.setTitle("Display Clock");

primaryStage.setScene(scene);

primaryStage.show();

pane.widthProperty().addListener(ov ->

clock.setW(pane.getWidth()));

pane.heightProperty().addListener(ov ->

clock.setH(pane.getHeight()));

}

public static void main (String[] args) { Application.launch(args); }

}

ClockPane.java

package primier;

import java.util.Calendar;

import java.util.GregorianCalendar;

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;

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;

/** Construct a default clock with the current time*/

public ClockPane() {

setCurrentTime();

}

/** Construct a clock with specified hour, minute, and second */

public ClockPane(int hour, int minute, int second) {

this.hour = hour;

this.minute = minute;

this.second = second;

paintClock();

}

/** Return hour */

public int getHour() {

return hour;

}

/** Set a new hour */

public void setHour(int hour) {

this.hour = hour;

paintClock();

}

/** Return minute */

public int getMinute() {

return minute;

}

/** Set a new minute */

public void setMinute(int minute) {

this.minute = minute;

paintClock();

}

/** Return second */

public int getSecond() {

return second;

}

/** Set a new second */

public void setSecond(int second) {

this.second = second;

paintClock();

}

/** Return clock pane's width */

public double getW() {

return w;

}

/** Set clock pane's width */

public void setW(double w) {

this.w = w;

paintClock();

}

/** Return clock pane's height */

public double getH() {

return h;

}

/** Set clock pane's height */

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();

//Set current hour, minute and second

this.hour = calendar.get(Calendar.HOUR_OF_DAY);

this.minute = calendar.get(Calendar.MINUTE);

this.second = calendar.get(Calendar.SECOND);

paintClock();

}

/** Paint the clock */

protected void paintClock() {

// Initialize clock parameters

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);

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");

// Draw second hand

double sLength = clockRadius * 0.8;

double secondX = centerX + sLength * Math.sin(second * (2 * Math.PI / 60));

double secondY = centerY - sLength * Math.cos(second * (2 * Math.PI / 60));

Line sLine = new Line(centerX, centerY, secondX, secondY);

sLine.setStroke(Color.GRAY);

// Draw minute hand

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);

// Draw hour hand

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 / 60.0) * (2 * Math.PI / 12));

Line hLine = new Line(centerX, centerY, hourX, hourY);

sLine.setStroke(Color.GREEN);

getChildren().clear();

getChildren().addAll(circle, t1, t2, t3, t4, sLine, mLine, hLine);

}

}

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