2.2 题目解析
编写程序，javaFx程序通过继承javafx.application.Application来实现的。运用其中的方法，类进行一系列的操作，对整个时钟界面进行布局。通过CurrentTime()时间函数获得当前时间，是整个时钟可以运行。
2.3 解决方案 实验一
ClockPane类继承pane,通过clockpane构造函数，getHour()，setHour()，getMinute()，setMinute()，getSecond()，setSecond()，setCurrentTime()获得当前时间，通过paintClock()函数画出整个表盘，最后通过main()函数进入。
实验二
ClockPane类继承pane,通过clockpane构造函数，getHour()，setHour()，getMinute()，setMinute()，getSecond()，setSecond()，setCurrentTime()获得当前时间，通过paintClock()函数画出整个表盘。设置两个bottom按钮，分别为stop,start来控制时钟的停止与运行。最后通过main()函数进入。
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第三章 详细设计
实验一源代码：
package qw;
import javafx.animation.KeyFrame; import javafx.animation.Timeline; import javafx.application.Application; import javafx.event.ActionEvent; import javafx.event.EventHandler; import javafx.scene.control.Button; import javafx.scene.layout.HBox; import javafx.geometry.Pos; import javafx.stage.Stage; import javafx.scene.Scene;
import javafx.scene.layout.BorderPane; 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; import javafx.util.Duration; 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() {
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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() {
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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(); // Repaint the clock }
/** Paint the clock */ public 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 t12 = new Text(centerX-3 , centerY - clockRadius +12,\); Text t9 = new Text(centerX - clockRadius + 3, centerY , \); Text t3 = new Text(centerX + clockRadius - 12, centerY , \); Text t6 = new Text(centerX - 3, centerY + clockRadius - 3, \); Text t1 = new Text(centerX +clockRadius*Math.sin(Math.PI/6)-5, centerY-clockRadius*Math.cos(Math.PI/6)+12 , \);
Text t2 = new Text(centerX +clockRadius*Math.sin(Math.PI/3)-12, centerY-clockRadius*Math.cos(Math.PI/3)+5 , \);
Text t4 = new Text(centerX +clockRadius*Math.sin(Math.PI/3)-9, centerY+clockRadius*Math.cos(Math.PI/3)+1 , \);
Text t5 = new Text(centerX +clockRadius*Math.sin(Math.PI/6)-5,
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centerY+clockRadius*Math.cos(Math.PI/6)-3 , \);
Text t7 = new Text(centerX -clockRadius*Math.sin(Math.PI/6)+1, centerY+clockRadius*Math.cos(Math.PI/6)-4 , \);
Text t8 = new Text(centerX -clockRadius*Math.sin(Math.PI/3)+1, centerY+clockRadius*Math.cos(Math.PI/3)+0 , \);
Text t10 = new Text(centerX -clockRadius*Math.sin(Math.PI/3)+2, centerY-clockRadius*Math.cos(Math.PI/3)+6 , \);
Text t11 = new Text(centerX -clockRadius*Math.sin(Math.PI/6)-3, centerY-clockRadius*Math.cos(Math.PI/6)+12 , \);
// 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.RED);
// Draw minute hand
double mLength = clockRadius * 0.65; double xMinute = 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, xMinute, 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); hLine.setStroke(Color.GREEN);
getChildren().clear();
getChildren().addAll(circle, t1, t2, t3, t4,t5,t6,t7,t8,t9,t10,t11,t12, sLine, mLine, hLine); } }
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