Java语言程序设计的课程设计项目利用Java实现地球系动画完整实现实例(第8部分).doc

1.1 利用Java实现地球系动画完整实现实例（第8部分）1.1.1 在界面中“画图”拖放地球和月亮1、需要补充的知识（1）Java中的事件编程（2）MouseListener接口中的各个方法所代表的事件public void mousePressed(MouseEvent e);/ 鼠标按键在组件上单击（按下并释放）时调用。public void mouseReleased(MouseEvent e); /鼠标按钮在组件上释放时调用。public void mouseClicked(MouseEvent e);/ 鼠标按键在组件上按下时调用。public void mouseEntered(MouseEvent e);/ 鼠标进入到组件上时调用。public void mouseExited(MouseEvent e);/ 鼠标离开组件时调用。特别是mousePressed和mouseReleased方法的编程2、EarthPlanetApplet程序import java.awt.Color;import java.awt.Font;import java.awt.Graphics;import java.awt.Image;import java.awt.MediaTracker;import java.awt.Rectangle;import java.awt.Toolkit;import .URL;import java.awt.event.MouseEvent;import java.awt.event.MouseListener;import java.awt.event.MouseMotionListener;import javax.swing.JApplet;public class EarthPlanetApplet extends JApplet implements Runnable,MouseMotionListener,MouseListenerprivate Thread earthMultiThread = null; private Thread moonMultiThread = null;private Graphics guiGraphics;private Image allImagesArray;private int currentImageIndex=0;private int imageWidth = 0;private int imageHeight = 0;private boolean allImagesLoaded = false;private final int NUMBER_IMAGES = 18;private boolean isRunedByApplication = false;int currentRotatingAngle=0;int earthCenterX0,earthCenterY0;int circleRadius=100;int currentRotatingCount=0;public static void main(String args) EarthPlanetFrame applicationJFrame=null;applicationJFrame=new EarthPlanetFrame(利用Java实现的地球系动画);EarthPlanetApplet threadApplet=null;threadApplet=new EarthPlanetApplet();applicationJFrame.getContentPane().add(Center, threadApplet);threadApplet.isRunedByApplication = true;threadApplet.init();threadApplet.start();applicationJFrame.setVisible(true); public EarthPlanetApplet()this.addMouseMotionListener(this);this.addMouseListener(this);public void start()if (earthMultiThread = null)earthMultiThread = new Thread(this);earthMultiThread.start();if (moonMultiThread = null)moonMultiThread = new Thread(this);moonMultiThread.start();public void stop()if (earthMultiThread != null)earthMultiThread.stop();earthMultiThread = null;if (moonMultiThread != null)moonMultiThread.stop();moonMultiThread = null;public void loadAllEarthImage()guiGraphics = getGraphics();allImagesArray = new ImageNUMBER_IMAGES;MediaTracker tracker = new MediaTracker(this);String strImage;for (int currentIndex = 1; currentIndex = NUMBER_IMAGES; currentIndex+)strImage = /images/img00 + (currentIndex 360) currentRotatingAngle=0; currentRotatingCount+; g.drawString(转动+currentRotatingCount+次,25,313); g.fillRect(25,300-currentRotatingCount*30,40, currentRotatingCount*30); public void paint(Graphics g)if (allImagesLoaded)Rectangle r = g.getClipBounds();g.clearRect(r.x, r.y, r.width, r.height);displayImage(g);Color redColor=new Color(255,0,0); /红色g.setColor(redColor);Font someOneFont=new Font(Dialog,Font.BOLD,40);g.setFont(someOneFont);g.drawString(利用Java实现的地球系动画,100,100);drawAxisLines(g);elseg.drawString(正在加载图像，请等待., 10, 20);private void drawAxisLines(Graphics g)g.drawLine(20,300,300,300); /画出X坐标轴 g.drawLine(20,300,20,20);/画出Y坐标轴 g.drawLine(20,270,15,270); /画出Y坐标轴上的数据的各个刻度线，共5条 g.drawLine(20,240,15,240); g.drawLine(20,210,15,210); g.drawLine(20,180,15,180); g.drawLine(20,150,15,150); g.drawLine(20,120,15,120); g.drawLine(20,90,15,90); g.drawLine(20,60,15,60); public void mouseDragged(MouseEvent e)getGraphics().drawLine(e.getX(),e.getY(),e.getX(),e.getY();repaint();earthCenterX0=e.getX();/改变球的图像位置为鼠标拖放的位置earthCenterY0=e.getY();public void mouseMoved(MouseEvent e)public void mouseClicked(MouseEvent e) public void mouseEntered(MouseEvent e) public void mouseExited(MouseEvent e) public void mousePressed(MouseEvent e) /拖动过程中终止旋转stop(); public void mouseReleased(MouseEvent e) /松开鼠标后，复位图像的位置earthCenterX0=(getSize().width - imageWidth) / 2;earthCenterY0=(getSize().height - imageHeight) / 2;repaint();start();注意mouseDragged方法所对应的事件为“鼠标拖放”3、Applet程序方式执行4、应用程序方式执行作业：实现如下功能当鼠标在程序的窗口区域时，将鼠标光标改变为“手形”。离开时再恢复为原始的形状。Cursor oldCursor=null;public void mouseEntered(MouseEvent e) oldCursor=this.getCursor();this.setCursor(new Cursor(Cursor.HAND_CURSOR);public void mouseExited(MouseEvent e) this.setCursor(oldCursor);1.1.2 添加用户界面组件，实现人机交互添加两个按钮、并控制线程1、需要补充的知识（1）Java Swing（摇摆、摆动、摇荡）Swing是一个用于开发Java应用程序用户界面的开发工具包。它以抽象窗口工具包（AWT）为基础使跨平台应用程序可以使用任何可插拔的外观风格。工具包中所有的包都是以swing作为名称，例如javax.swing,javax.swing.event等。Swing的产生主要原因就是AWT不能满足图形化用户界面发展的需要。AWT设计的初衷是支持开发小应用程序的简单用户界面。例如AWT缺少剪贴板、打印支持、键盘导航等特性，而且原来的AWT甚至不包括弹出式菜单或滚动窗格等基本元素。（2）Java中的Swing 基本组件的编程1) 容器组件：顶层容器（窗体JFrame、对话框JDialog、JApplet)和非顶层容器（面板JPanel）2) 基本组件：具有一定功能、但不担当容器的组件。这类组件非常多，如标签（JLabel）、按钮（JButton）、文本框（JTextField）、文本域（JTextArea）等。（3）ActionListener接口中的各个方法所代表的事件特别是actionPerformed方法的编程（4）Swing中的GUI布局JApplet新特性不可以把组件直接添加到JApplet容器中，JApplet容器也含有一个称为内容面板的容器，应当把组件添加到内容面板中。不能为JApplet容器设置布局，而应当为JApplet容器的内容面板设置布局。内容面板的默认布局是BorderLayout布局。JApplet容器通过调用方法：getContentPane()，得到内容面板。2、Matisse4MyEclipseMatisse是NetBeans中新一代的UI设计工具，Matisse将是一个支持Swing显示布局的工具。Matisse4MyEclipse即Matisse for MyEclipse。3、JButton（1）按钮大概是使用最为普遍的用户界面组件按钮通常带有某种边框，且可以被鼠标或快捷键激活。能够激活它们来完成某个功能，而且很多其他Swing组件都是AbstractButton类的扩展，而AbstractButton类是Swing按钮的基类。 （2）JButton共有4个构造函数1) JButton():建立一个按钮。 2) JButton(Icon icon):建立一个有图像的按钮。 3) JButton(String icon):建立一个有文字的按钮。 4) JButton(String text,Icon icon):建立一个有图像与文字的按钮。（3）按钮中增加HTML样式import javax.swing.JButton; import javax.swing.JFrame; public class HTMLButton public static void main(String args) JFrame frame = new JFrame(DefaultButton); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); String htmlTag = 确定; JButton htmlButton = new JButton(htmlTag); frame.add(htmlButton); frame.setSize(300, 200); frame.setVisible(true); 4、EarthPlanetApplet程序Applet的GUI可以在init()方法中构造和显示，在init()方法中构造GUI是安全的，只要不对Applet中的对象调用show()或setVisible(true)方法。import java.awt.BorderLayout;import java.awt.Color;import java.awt.Font;import java.awt.Graphics;import java.awt.Image;import java.awt.MediaTracker;import java.awt.Rectangle;import java.awt.Toolkit;import .URL;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.MouseEvent;import java.awt.event.MouseListener;import java.awt.event.MouseMotionListener;import javax.swing.JApplet;import javax.swing.JButton;import javax.swing.JPanel;public class EarthPlanetApplet extends JApplet implements Runnable,MouseMotionListener,MouseListener,ActionListenerprivate Thread earthMultiThread = null; private Thread moonMultiThread = null;private Graphics guiGraphics;private Image allImagesArray;private int currentImageIndex=0;private int imageWidth = 0;private int imageHeight = 0;private boolean allImagesLoaded = false;private final int NUMBER_IMAGES = 18;private boolean isRunedByApplication = false;int currentRotatingAngle=0;int earthCenterX0,earthCenterY0;int circleRadius=100;int currentRotatingCount=0;JButton playButton,stopButton;public static void main(String args) EarthPlanetFrame applicationJFrame=null;applicationJFrame=new EarthPlanetFrame(利用Java实现的地球系动画);EarthPlanetApplet threadApplet=null;threadApplet=new EarthPlanetApplet();applicationJFrame.getContentPane().add(Center, threadApplet);threadApplet.isRunedByApplication = true;threadApplet.init();threadApplet.start();applicationJFrame.setVisible(true); public EarthPlanetApplet()this.addMouseMotionListener(this);this.addMouseListener(this);public void init()JPanel buttonPanel=new JPanel();playButton=new JButton(Play);playButton.addActionListener(this);stopButton=new JButton(Stop);stopButton.addActionListener(this);buttonPanel.add(playButton);buttonPanel.add(stopButton);this.getContentPane().setLayout(new BorderLayout();this.getContentPane().add(buttonPanel,BorderLayout.NORTH);public void start()if (earthMultiThread = null)earthMultiThread = new Thread(this);earthMultiThread.start();if (moonMultiThread = null)moonMultiThread = new Thread(this);moonMultiThread.start();public void stop()if (earthMultiThread != null)earthMultiThread.stop();earthMultiThread = null;if (moonMultiThread != null)moonMultiThread.stop();moonMultiThread = null;public void loadAllEarthImage()guiGraphics = getGraphics();allImagesArray = new ImageNUMBER_IMAGES;MediaTracker tracker = new MediaTracker(this);String strImage;for (int currentIndex = 1; currentIndex = NUMBER_IMAGES; currentIndex+)strImage = /images/img00 + (currentIndex 360) currentRotatingAngle=0; currentRotatingCount+; g.drawString(转动+currentRotatingCount+次,25,313)