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

1、1.1 利用Java实现地球系动画完整实现实例（第4部分）1.1.1 产生地球和月亮、并且月亮围着地球转1、如何实现？（1）什么是软件需求“产生地球和月亮、并且月凫围着地球转。”（2）什么是软件设计（思考）设计的结果其实就是产生出“解决方案”。（3）什么是软件开发实现（编程）程序员按照设计人员的设计文档进行编程实现。（4）什么是软件测试一一找出程序中的“各种缺陷（Bug）”（5）部署和维护一、第一步：创建两个地球线程1、EarthPlanetAppletimport;import;import;import;import;import;import;publicclassEarthPlanet

2、AppletextendsJAppletimplementsRunnableprivateThreadearthMultiThread=null;privateThreadmoonMultiThread=null;privateGraphicsguiGraphics;privateImagealllmagesArrayf;privateintcurrentImageIndex=O;privateintimageWidth=0;privateintimageHeight=0;privatebooleanalllmagesLoaded=false;privatefinalintNUMBERMAGE

3、S=18;privatebooleanisRunedByApplication=false;publicstaticvoidmain(Stringargs)EarthPlanetFrameapplicationJFrame=nulI;applicationJFrame=newEarthPlanetFrame("利用Java实现的地球系动画)EarthPlanetAppletthreadApp!et=null;threadApplet=newEarthPlanetApplet();applicationJFrame.getContentPane().add(MCentern,threa

4、dApplet);threadApplet.isRunedByApplication=true;threadApplet.init();threadApplet.start。；applicationJFrame.setVisible(true);publicEarthPlanetApplet()publicvoidstart()if(earthMultiThread=null)earthMultiThread=newThread(this);earthMultiThread.start();)if(moonMultiThread=null)仓ij建出第2个线程对象moonMultiThread

5、=newThread(this);moonMultiThread.startO;publicvoidstop()if(earthMultiThread!=null)earthMultiThread.stopO；earthMultiThread=null;)if(moonMultiThread!=mill)销毁线程对象moonMultiThread.stopO;moonMultiThread=null;)IpublicvoidloadAlIEarthImage()guiGraphics=getGraphics();alllmagesArray=newImageNUMBERMAGES;MediaT

6、rackertracker=newMediaTracker(this);Stringstrimage;for(intcurrentlndex=1;currentlndex<=NUMBERMAGES;currentIndex+)strimage=H/images/imgOOH+(currentindex<10)?H0H:+currentindex+【gif'；URLoneImageURL=getCIass().getResource(strImage);if(isRunedByApplication)allImagesArraycurrentIndeX-1=Toolkit.g

7、etDefaultToolkit().getIniage(oneImageURL);)elseallImagesArraycurrentIndex<1=getlmage(onelmageURL);)tracker.addlmage(alllmagesArraycurrentindex-1.0);trytracker.waitForAH();catch(InterruptedExceptione)e.printStackTrace();1alllmagesLoaded=!tracker.isErrorAny();if(!alIIniagesLoaded)stop();guiGraphics

8、.drawString("图像加载错误，可能是没有找到文件！",10,40);return;)imageWidth=allImagesArrayO.getWidth(this);imageHeight=allImagesArrayO.getHeight(this);publicvoidrun()if(!allImagesLoaded)loadAlIEarthlmageO；)repaint();while(true)trydisplaylmage(guiGraphics);currentlmagelndex+;if(currentimageindex=NUMBER_IMAGE

9、S)currentimageindex=0:Thread.sleep(50);catch(InterruptedExceptione)stop();)privatevoiddisp!ayImage(Graphicsg)分别显示两个地球图像if(!alIImagesLoaded)return;if(Thread.currentThread()=earthMultiThreacl)g.lrawImage(allImagesArraycurrentImageIndex5(getSize().width-imageVVidth)/2,(getSize().height-imageHeight)/2,n

10、ull);else/改变坐标位置g.drawImage(allImagesArraycurrentImageIndex,(getSize(),width-ImageWidth)/4,(getSize().height-imageHeight)/4,null);)publicvoidpaint(Graphicsg)if(allImagesLoaded)Rectangler=g.getClipBounds();g.clearRect(r.x,r,y,r.width,r.height);displaylmage(g);)elseg.drawString("正在加载图像,请等待二10,20)

11、;)上面的代码主要是再创建出第2个线程，并显示出第2套图像。其中的getGipBounds方法得到代表画板边界的矩形，然后从这个矩形中提取宽度和高度数据，再清除该矩形区域。如果除掉下面的语句，将会出现什么现象？g.clearRect(r.x,r.y,r.width,r.height);2、Apple七程序方式执行(两个转动的图像)B利用了实现的地母系动画,/.,飞二、第二步：控制两个地球线程的旋转的速度1、需要补充的知识sleep(毫秒数)是Thread类的静态方法，它能够控制线程。如Thread.sleep(lOOO)；该线程睡眠1秒钟，等1秒钟之后，继续余下代码执行。但在sleep时间间隔

12、期满后，线程不一定立即恢复执行。这是因为在那个时刻，其它线程可能正在运行而且没有被调度为放弃执行，除非出现下面的情况：1)“醒来”的线程具有更高的优先级。2)正在运行的线程因为其它原因而阻塞。2、EarthPlanetApplet程序的代码import;import;import;import;import;import;import;publicclassEarthPlanetAppletextendsJAppletimplementsRunnableprivateThreadearthMultiThread=null;privateThreadnioonMultiThread=null;p

13、rivateGraphicsguiGraphics;privateImageallImagesArray;privateintcurrentImageIndex=O;privateintimageWidth=0;privateintimageHeight=0;privatebooleanalllmagesLoaded=false;privatefinalintNUMBERMAGES=18;privatebooleanisRunedByApplication=false;publicstaticvoidmain(Stringargs)EarthPlanetFrameapplicationJFra

14、me=null;applicationJFrame=newEarthPlanetFrame("利用Java实现的地球系动画)EarthPlanetAppletthreadApplet=null;threadApplet=newEarthPlanetApplet();applicationJFrame.getContentPane().add(HCenterH,threadApplet);threadApplet.isRunedByApplication=true;threadApplet.initQ;threadApplet.start();applicationJFrame.set

15、Visible(true);)publicEarthPlanetApplet()publicvoidstart()if(earthMultiThread=null)earthMultiThread=newThread(this);earthMultiThread.start();1if(nioonMultiThread=null)moonMultiThread=newThread(this);nioonMultiThread.start();)publicvoidstop()if(earthMultiThread!=null)earthMultiThread.stop();earthMulti

16、Thread=null;)if(nioonMultiThread!=null)nioonMultiThread.stop();nioonMultiThread=null;)publicvoidloadAlIEarthImage()guiGraphics=getGraphics();alllmagesArray=newImageNUMBERMAGES;MediaTrackertracker=newMediaTracker(this);Stringstrimage;for(intcurrentindex=1;currentlndex<=NUMBERMAGES;currentIndex+)st

17、rimage=,7images/imgOOH+(currentlndex<10)?H0H:+currentindex+【gif”；URLoneImageURL=getCIass().getResource(strImage);if(isRunedByApplication)allImagesArraycurrentIndex-1=Toolkit.getDefaultToolkit().getImage(oneImageURL);elsealllmagesArrayfcurrentlndex-1=getlmage(onelmageURL);)tracker.addImage(allImag

18、esArraycurrentIndex-l,0);)trytracker.waitForAH();catch(InterruptedExceptione)e.printStackTrace();)allImagesLA)aded=!tracker.isErrorAny();if(!aIHmagesLoaded)stop();guiGraphics.drawString("图像力口载错误,可能是没有找到文件!",10,40);return;)imageWidth=allImagesAiTayO.getWidth(this);imageHeight=allImagesArray

19、O.getHeight(this);)publicvoidrun()if(JalllniagesLoaded)loadAHEarthlmageO；)repaint();while(true)trydisplaylmage(guiGraphics);currentlmagelndex+;if(currentimageindex=NUMBER_IMAGES)currentimageindex=0;if(Thread.currentThread()=earthMultiThread)Thread.sleep(50);)elseThread.sleep(500);)catch(InterruptedE

20、xceptione)stop();)privatevoiddisp!ayImage(Graphicsg)if(!allIniagesLoaded)return;if(Thread.currentThread()=earthMultiThread)g.drawImage(allImagesArraycurrentImageIndex,(getSize().width-imageWidth)/2,(getSize().height-imageHeight)/2,null);)elseg.drawImage(aIHmagesArraycurrentImageIndex,(getSize().widt

21、h-imageWidth)/4,(getSize().height-imageHeight)/4,null);1Ipublicvoidpaint(Graphicsg)if(allImagesLoaded)Rectangler=g.getClipBounds();g.clearRect(r.x,r.y,r.width,r.height);displaylmage(g);)elseg.drawString("正在加载图像，请等待.”，10,20);)在程序中通过对两个不同的线程采用不同的“休眠”时间，控制两个线程的频率，相应地也就达到控制地球的“自转”，并且还能够控制“自转”的速度。3、

22、Applet程序方式执行，但此时的两个球的旋转速度有差别地址(D)|密jD：9匕二】转到链接4、应用程序方式执行，但此时的两个球的旋转速度有差别三、第三步：月亮围着地球转1、需要补充的知识圆周方程(1)下面的earthCenterXO、earthCenterYO代表地球的圆心坐标earthCenterXO=(getSize().width-imageWidth)/2;earthCenterYO=(getSize().height-imageHeight)/2;(2)下面的moonCenterXO、moonCenterYO代表地球的圆心坐标moonCenterXO=earthCenterXO+c

23、ircleRadius*Math.cos(currentRotatingAngle*Math.PI/l80)；moonCenterYO=earthCenterY0+circleRadius*Math.sin(currentRotatingAngle*Math.PI/180)：因此，为了能够产生动态的运行效果，需要在显示图片的同时改变图像显示的位置，连续不断地在不同位置处画出地球的图像。2、EarthPlanetApplet代码import;import;import;import;import;import;import;publicclassEarthPlanetAppletextendsJ

24、AppletimplementsRunnableprivateThreadearthMultiThread=null;privateThreadmoonMultiThread=null;privatebooleanisRunedByApplication=false;设置程序执行的方式privateGraphicsguiGraphics;下面的变量都是与图像有关的变量privateImageallImagesArray;privateintcurrentImageIndex=O;privateintimageWidth=0;privateintimageHeight=0;privatebool

25、eanalllmagesLoaded=false;privatefinalintNUMBERMAGES=18;intearthCenterX0,earthCenterY05moonCenterX0,moonCenterY0;intcurrentRotatingAngle=0;intcircleRadius=100;publicEarthPlanetApplet()publicstaticvoidmain(Stringargs)EarthPlanetFrameapplicationJFrame=nulI;applicationJFrame=newEarthPlanetFrame(n,JJTJav

26、a实现的地球系动画)EarthPlanetAppletthreadApp!et=null;threadApplet=newEarthPlanetApplet();applicationJFrame.getContentPane().add(HCenterH,threadApplet);applicationJFrame.setVisible(true);threadApplet.isRunedByAppIication=true;threadApplet.init();threadApplet.start();publicvoidstart()在重写的start。方法中创建线程对象if(ear

27、thMultiThread=null)earthMultiThread=newThread(this);earthMultiThread.start();)if(nioonMultiThread=null)moonMultiThread=newThread(this);nioonMultiThread.start();)publicvoidstop。在重写的stop。方法中箱毁线程对象if(earthMultiThread!=null)earthMultiThread.stopO；注意终止线程的方式应该采用其它更好的形式earthMultiThread=null;)if(moonMultiTh

28、read!=null)moonMu11iThread.stop();注意终止线程的方式应该采用其它更好的形式moonMultiThread=null;)publicvoidloadAllEarthImage()guiGraphics=getGraphics();alllmagesArray=newImageNUMBERMAGES;MediaTrackertracker=newMediaTracker(this);Stringstrimage=null;for(intcurrentindex=1;currentlndex<=NUMBERMAGES;currentIndex+)strlmag

29、e=M/images/imgOOH+(currentindex<10)?"0":+currentindex+”.giF;URLoneImageURL=getCIass().getResource(strImage);if(isRunedByApplication)allImagesArraycurrentIndex-1=Toolkit.getDefaultToolkit().getImage(oneImageURL);)elseallImagesArraycurrentIndex-1=getlmage(onelmageURL);)tracker.addImage(al

30、lImagesArraycurrentIndex-1,0);)trytracker.waitForAll();catch(InterruptedExceptione)e.printStackTrace();)alllmagesLoaded=!tracker.isErrorAny();/alllmagesLoaded=tracker.checkAH();if(!aHImagesLoaded)stop();guiGraphics.drawSiring("图像力口载错误,可能是没有找到文件!",10,20);return;imageWidth=allImagesArrayO.ge

31、tWidth(this);获取被加载的图像的高度imageHeight=allImagesAiTayO.getHeight(this);获取被加载的图像的宽度)publicvoidrun()if(!aHImagesLoaded)loadAHEarthlmageO；)repaint();while(true)trydisplaylmage(giiiGraphics);currentlmagelndex+;if(currentimageindex=NUMBER_IMAGES)currentimageindex=0:)if(Thread.currentThread()=this.earthMulti

32、Thread)Thread.sleep(50);)elseThread.sleep(10);)catch(InterruptedExceptione)stop();)privatevoiddisplayImage(Graphicsg)if(!allImagesLoaded)识别所有的图像文件是否已经加载完毕return;1this.earthCenterXO=(getSize().width-imageWidth)/2;this.earthCenterYO=(getSize().height-imageHeight)/2;if(Thread.currentThread()=this.earth

33、MultiThread)g.drawIinage(allImagesArraycurrentImageIndex,earthCenterXO,earthCenterYO,null);)elsethis.moonCenterXO=earthCenterX0+(int)(this.circleRadius*Math.cos(currentRotatingAngle*Math.PI/180);this.moonCenterYO=earthCenterY0+(int)(this.circleRadius*Math.sin(currentRotatingAngle*Math.PI/180);g.draw

34、Image(allIinagesArraycurrentImageIndex,moonCenterXOjnoonCenterY0.null);this.currentRotatingAngle+;if(currentRotatingAngle>360)currentRotatingAngle=0;)publicvoidpaint(Graphicsg)if(allImagesLoaded)/Rectangler=g.getClipBounds();g.clearRect(O,0,this.getWidth(),this.getHeight();displaylmage(g);)elseg.

35、drawString("正在加载图像,请等待10,20);)在displayImage。方法中图片显示的位置。3、测试现在的效果2小程后查看器EaurtUlnetAipplet.c.小程序小程序已启动。小程序己启动.背景图上留下每个动作的残迹，因此必须对图像进行擦除。再次明确计算机实现动画的思路是：定位、画、擦除、再画、再擦除。其中擦除图像的方法决定着该动画的制作方法。所以，擦除图像成了制作动画的一个关键部分。4、实现清除的相关功能实现的代码示例import;import;import;import;import;import;import;publicclassEarthPlane

36、tAppletextendsJAppletimplementsRunnableprivateThreadearthMultiThread=null;privateThreadnioonMultiThread=null;privateGraphicsguiGraphics;privateImagealllmagesArray;privateintcurrentImageIndex=O;privateintimageWidth=0;privateintimageHeight=0;19word格式支持编辑，如有帮助欢迎下载支持。privatebooleanalllmagesLoaded=false;

37、privatefinalintNUMBERMAGES=18;privatebooleanisRunedByApplication=false;intcurrentRotatingAngle=0;intearthCenterXO,eailhCenterYO,moonCenterXO,moonCenterYO;intcircleRadius=100;publicstaticvoidmain(Stringargs)EarthPlanetFrameapplicationJFrame=nulI:applicationJFrame=newEarthPlanetFrame(n,JJTJava实现的地球系动画

38、”)；EarthPlanetAppletthreadApplet=null;threadApplet=newEarthPlanetApplet();applicationJFrame.getContentPane().add(nCenter'threadApplet);threadApplet.isRunedByApplication=true;threadApplet.init();threadApplet.start();applicationJFrame.setVisible(true);publicEarthPlanetApplet()publicvoidstart()if(e

39、arthMultiThread=null)earthMultiThread=newThread(this);earthMultiThread.start();)if(moonMultiThread=null)nioonMultiThread=newThread(this);moonMultiThread.start();)publicvoidstop()if(earthMultiThread!=null)earthMultiThread.stop();earthMultiThread=null;1if(nioonMultiThread!=null)moonMultiThread.stopO；n

40、ioonMultiThread=null;)publicvoidloadAlIEarthImage()guiGraphics=getGraphics();allImagesArray=newImageNUMBER_IMAGES;MediaTrackertracker=newMediaTracker(this);Stringstrlmage;for(intcurrentindex=1;currentindex<=NUMBERMAGES;currentIndex+)strimage=H/images/imgOOM+(currentindex<10)?H0H:+currentindex+

41、”.giF；URLoneImageURL=getClass().getResource(strImage);if(isRunedByApplication)alllmagesArrayfcurrentlndex-1=Toolkit.getDefaultToolkit().getIniage(oneIniageURL);elseallImagesArraycurrentIndex-1=getlmage(onelmageURL);tracker.addImage(allImagesArraycurrentIndex-1,0);)trytracker.waitForAll();catch(Inter

42、ruptedExceptione)e.printStackTrace();)alllmagesLoaded=!tracker.isErrorAny();if(!allIniagesLoaded)stop();guiGraphics.drawString("图像加载错误，可能是没有找到文件!",10,40);return;)imageWidth=allImagesArrayO.getWidth(this);imageHeight=allImagesArrayO.getHeight(this);Ipublicvoidrun()if(!aIIIniagesLoaded)loadAHEarthlmageO；)repaint();while(true)trydisplaylmage(guiGraphics);currentlmagelndex+;if(currentimageindex=NUMBERMAGES)currentimageindex=0:if(Thread.currentThread()=earthMultiThread)Thread.s