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。
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<ActionEvent> 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; import 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<ActionEvent> 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); } }
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持自学编程网。
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