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。

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。