java中使用fx制作一个简单的时钟

package com.wu.demo;

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.collections.ObservableList;
import javafx.scene.Scene;
import javafx.scene.canvas.Canvas;
import javafx.scene.canvas.GraphicsContext;
import javafx.scene.layout.AnchorPane;
import javafx.scene.paint.Color;
import javafx.scene.paint.Paint;
import javafx.scene.text.Font;
import javafx.stage.Stage;
import javafx.util.Duration;

public class view extends Application{
 @Override
 public void start(Stage stage) throws Exception{
 AnchorPane root = new AnchorPane();
 Canvas canvas = new Canvas(800,650);
 root.getChildren().add(canvas);
 Scene scene = new Scene(root,800,650);
 stage.setScene(scene);
 stage.setResizable(false);
 stage.show();
 // 获取画板对象
 GraphicsContext gc = canvas.getGraphicsContext2D();
 // 创建时间轴
 Timeline timeLine = new Timeline();
 // 获取时间轴的帧列表
 ObservableList<KeyFrame> keyFrames = timeLine.getKeyFrames();
 // 添加关键帧
 keyFrames.add(new KeyFrame(Duration.seconds(0.1),e->{
 // 刷新操作
 gc.clearRect(0,0,800,650);
 // 绘制表盘
 dials(gc);
 // 绘制刻度
 scale(gc);
 // 绘制指针
 point(gc);
 }));
 // 设置时间轴播放次数为无限
 timeLine.setCycleCount(-1);
 // 播放时间轴
 timeLine.play();
 }
 /**
 * 绘制表盘
 * @param gc
 */
 public void dials(GraphicsContext gc) {
 // 保存现场
 gc.save();
 // 变换坐标到外切圆矩形左上角坐标
 gc.translate(100,25);
 gc.setLineWidth(8);
 gc.setStroke(Color.GRAY);
 gc.strokeOval(0, 0, 600, 600);
 gc.restore();
 }
 /**
 * 绘制刻度
 * @param gc
 */
 
 public void scale(GraphicsContext gc) {
 // 保存现场
 gc.save();
 // 变换坐标系原点到表盘中心
 gc.translate(400,325);
 // 坐标逆时针旋转角度-90
 gc.rotate(-90);
 // 设置字体大小
 gc.setFont(Font.font(20));
 for(int i = 1 ; i < 61 ; i++) {
 // 每一个刻度角度为6度
 gc.rotate(6);
 if(i % 5 == 0) {
 gc.save();
 // 当前坐标切换到 (250,0) 即刻度左边界位置
 gc.translate(250,0);
 // 设置表格数字位置 相对于桌面应该是竖直
 gc.rotate(90-i/5*30);
 gc.fillText(i/5+"",0,0);
 gc.restore();
 gc.fillRect(275,0,22,10);
 }
 else{
 gc.fillRect(285,0,12,5);
 }
 }
 // 恢复现场
 gc.restore();
 }
 /**
 * 绘制指针
 * @param gc
 */
 public void point(GraphicsContext gc) {
 LocalDateTime time = LocalDateTime.now();
 int seconds = time.getSecond();
 int minutes = time.getMinute();
 int hours = time.getHour();
 double[] pointX1 = new double[]{0,50,270,50};
 double[] pointY1 = new double[]{0,5,0,-5};
 double[] pointX2 = new double[]{0,30,210,30};
 double[] pointY2 = new double[]{0,10,0,-10};
 double[] pointX3 = new double[]{0,20,150,20};
 double[] pointY3 = new double[]{0,12,0,-12};
 gc.save();
 // 坐标移动至圆心
 gc.translate(400, 325);
 // 时间数字
 {
 String timeText1 = time.format(DateTimeFormatter.ofPattern("yyyy-MM-dd"));
 gc.setFill(Paint.valueOf("#c0c0c0"));
 gc.setFont(Font.font(20));
 gc.fillText(timeText1,-40,-200);
 String timeText2 = time.format(DateTimeFormatter.ofPattern("HH:mm:ss"));
 gc.setFill(Paint.valueOf("#c0c0c0"));
 gc.setFont(Font.font(115));
 gc.fillText(timeText2,-220,30);
 }
 // 秒钟
 {
 gc.save();
 gc.rotate(-90);
 gc.setFill(Color.RED);
 gc.rotate(seconds*6);
 // 四边形秒钟
 gc.fillPolygon(pointX1,pointY1, 4);
 gc.restore();
 }
 // 分钟
 {
 gc.save();
 gc.rotate(-90);
 gc.setFill(Color.BLUE);
 gc.rotate(minutes*6+0.1*seconds);
 // 四边形分钟
 gc.fillPolygon(pointX2,pointY2, 4);
 gc.restore();
 }
 // 时钟
 {
 gc.save();
 gc.rotate(-90);
 gc.setFill(Color.BLACK);
 gc.rotate(hours*30+minutes*0.5+seconds*(0.5/60));
 // 四边形时钟
 gc.fillPolygon(pointX3,pointY3, 4);
 gc.restore();
 }
 // 恢复现场
 gc.restore();
 
 }
 public static void main(String[] args) {
 launch(args);
 }
}