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今天就跟大家聊聊有關使用JavaFX如何制作一個簡易的時鐘，可能很多人都不太了解，為了讓大家更加了解，小編給大家總結了以下內容，希望大家根據這篇文章可以有所收獲。
具體內容如下
首先進行一個微調：讓表盤根據窗口大小自動調整大小：
在 ShowClock.start() 中，添加對面板長寬的監聽。
pane.widthProperty().addListener(ov -> clock.setW(pane.getWidth())); pane.heightProperty().addListener(ov -> clock.setH(pane.getHeight()));
添加對時間和鐘表大小的更改方法
在 ClockPane 類中添加：
/** 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 實現動態鐘表
在 ShowClock 類中添加：
//設置事件處理對象
EventHandler<ActionEvent> eventHandler = e -> {
clock.setCurrentTime();
};
//每秒結束后觸發eventHandler
Timeline animation = new Timeline(
new KeyFrame(Duration.millis(1000), eventHandler));
animation.setCycleCount(Timeline.INDEFINITE); //無限循環
animation.play(); //開始動畫就可以讓時鐘動起來了。
完整代碼
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();
//設置事件處理對象
EventHandler<ActionEvent> eventHandler = e -> {
clock.setCurrentTime();
};
//每秒結束后觸發eventHandler
Timeline animation = new Timeline(
new KeyFrame(Duration.millis(1000), eventHandler));
animation.setCycleCount(Timeline.INDEFINITE); //無限循環
animation.play(); //開始動畫
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);
}
}看完上述內容，你們對使用JavaFX如何制作一個簡易的時鐘有進一步的了解嗎？如果還想了解更多知識或者相關內容，請關注億速云行業資訊頻道，感謝大家的支持。
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