弹珠小游戏专业课程设计实验报告

摘要：这个小程序是关于弹珠小游戏，游戏比较简朴，以小球速度来区别游戏难易。该小程序是用左右键控制游戏开始和挡板方向，不让小球落究竟端，固然，小球速度越快，该游戏难度也就越大。此程序运用C#程序编写，在visualstudio环境下进行调试运营。弹珠原理：碰撞基本都是参照“反射定理”,就是出射角=入射角,但是做碰撞时需要角度。碰撞运动和球方向关于,球方向有好几种。有8向,也有4向。保证小球横向上在容许范畴之内运动，当触发时就反方向运动，和当出了球拍可击打范畴就停止运营了。对于该程序开发，必要达到如下规定：1、熟悉.NET开发环境，可以使用C#语言在.NET平台上独立设计、开发WINDOWS应用程序。2、掌握C#语言异常解决技术，可以使用.NET各种调试办法调试代码，掌握协助用法。3、掌握惯用控件以及控件惯用属性用法。4、界面要做到简洁易懂，具备人性化等特点。5、程序没有在使用过程中不存在任何问题。6、可选功能应全面，可以实行速度选取，游戏与否继续，尚有记录保存。目录摘要： 2目录 3一、 题目阐明 4二、总体设计 42.1．系统开发平台 4三、详细阐明 4３.1系统实行 4四、遇到问题和解决办法 20五、课程设计总结 22六、参照文献 22附录（源程序代码） 22题目阐明当今用简朴代码编写小游戏越来越受人们欢迎，因此对于小游戏开发也成为了各大编程人士最爱。我选取弹珠游戏这个课题，用代码控制游戏级别，运用不同函数来控制球速度和方向，游戏简朴而有趣。二、总体设计2.1．系统开发平台系统采用MicrosoftVisualStudio三、详细阐明在此弹球游戏中，对于球与挡板位置，借助于x与y坐标调节来实现记录，从而拟定球落在板上后球下一次方向。同步借助于VisualStudio中控件来控制小球速度。此项游戏计分运用函数count++，打中一种砖块即可得到一分，看你最多能打多少砖块。３.1系统实行1．主界面：打开弹珠游戏,开始运营程序，跳出一种Forms界面，顾客在此时必要先选取符合自己能力游戏级别，然后才可以进行游戏。如图1所示。图1.主界面功能菜单此界面代码为：usingSystem;usingSystem.Drawing;usingSystem.Collections;usingSystem.ComponentModel;usingSystem.Windows.Forms;namespaceBrickOut{ publicclassSpeedDialog：System.Windows.Forms.Form {privateSystem.Windows.Forms.GroupBoxgroupBox1;privateSystem.Windows.Forms.Buttonbutton1; privateSystem.ComponentModel.Containercomponents=null;privateButtonbutton2;privatePictureBoxpictureBox1;privateButtonbutton3;privateButtonbutton4;publicintSpeed=250; publicSpeedDialog() { InitializeComponent(); } protectedoverridevoidDispose(booldisposing) { if(disposing) { if(components!=null) { components.Dispose(); } } base.Dispose(disposing); } #regionWindowsFormDesignergeneratedcode privatevoidInitializeComponent() {System.ComponentModel.ComponentResourceManagerresources=newSystem.ComponentModel.ComponentResourceManager(typeof(SpeedDialog));this.groupBox1=newSystem.Windows.Forms.GroupBox();this.button4=newSystem.Windows.Forms.Button();this.button3=newSystem.Windows.Forms.Button();this.button1=newSystem.Windows.Forms.Button();this.button2=newSystem.Windows.Forms.Button();this.pictureBox1=newSystem.Windows.Forms.PictureBox();this.groupBox1.SuspendLayout();((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).BeginInit();this.SuspendLayout();this.groupBox1.BackColor=System.Drawing.Color.FromArgb(((int)(((byte)(224))))，((int)(((byte)(224))))，((int)(((byte)(224)))));this.groupBox1.Controls.Add(this.button4);this.groupBox1.Controls.Add(this.button3);this.groupBox1.Controls.Add(this.button1);this.groupBox1.Controls.Add(this.button2);this.groupBox1.Controls.Add(this.pictureBox1);this.groupBox1.Location=newSystem.Drawing.Point(-2，1);this.groupBox1.Name="groupBox1";this.groupBox1.Size=newSystem.Drawing.Size(320，344);this.groupBox1.TabIndex=0;this.groupBox1.TabStop=false;this.groupBox1.Text="选取难度";this.button4.BackColor=System.Drawing.Color.FromArgb(((int)(((byte)(192))))，((int)(((byte)(192))))，((int)(((byte)(255)))));this.button4.ForeColor=System.Drawing.Color.Red;this.button4.Location=newSystem.Drawing.Point(108，106);this.button4.Name="button4";this.button4.Size=newSystem.Drawing.Size(99，29);this.button4.TabIndex=5;this.button4.Text="协助";this.button4.UseVisualStyleBackColor=false;this.button4.Click+=newSystem.EventHandler(this.button4_Click)；this.button3.BackColor=System.Drawing.Color.Cyan;this.button3.Location=newSystem.Drawing.Point(108，58);this.button3.Name="button3";this.button3.Size=newSystem.Drawing.Size(99，29);this.button3.TabIndex=4;this.button3.Text="级别选取";this.button3.UseVisualStyleBackColor=false;this.button3.Click+=newSystem.EventHandler(this.button3_Click);this.button1.BackColor=System.Drawing.Color.FromArgb(((int)(((byte)(255))))，((int)(((byte)(128))))，((int)(((byte)(128)))));this.button1.DialogResult=System.Windows.Forms.DialogResult.OK;this.button1.Location=newSystem.Drawing.Point(107，11);this.button1.Name="button1";this.button1.Size=newSystem.Drawing.Size(98，29);this.button1.TabIndex=10;this.button1.Text="进入游戏";this.button1.UseVisualStyleBackColor=true;this.button1.Click+=newSystem.EventHandler(this.button1_Click);this.button2.BackColor=System.Drawing.Color.FromArgb(((int)(((byte)(192))))，((int)(((byte)(192))))，((int)(((byte)(0)))));this.button2.DialogResult=System.Windows.Forms.DialogResult.OK;this.button2.ForeColor=System.Drawing.Color.Blue;this.button2.Location=newSystem.Drawing.Point(110，157);this.button2.Name="button2";this.button2.Size=newSystem.Drawing.Size(98，29);this.button2.TabIndex=2;this.button2.Text="退出游戏";this.button2.UseVisualStyleBackColor=false;this.button2.Click+=newSystem.EventHandler(this.button2_Click);this.pictureBox1.BackgroundImage=((System.Drawing.Image)(resources.GetObject("pictureBox1.BackgroundImage")));this.pictureBox1.BackgroundImageLayout=System.Windows.Forms.ImageLayout.Stretch;this.pictureBox1.Location=newSystem.Drawing.Point(0，0);this.pictureBox1.Name="pictureBox1";this.pictureBox1.Size=newSystem.Drawing.Size(318，344);this.pictureBox1.TabIndex=3;this.pictureBox1.TabStop=false;this.pictureBox1.Click+=newSystem.EventHandler(this.pictureBox1_Click);this.AutoScaleBaseSize=newSystem.Drawing.Size(6，14);this.BackColor=System.Drawing.Color.White;this.ClientSize=newSystem.Drawing.Size(316，349);this.Controls.Add(this.groupBox1);this.Icon=((System.Drawing.Icon)(resources.GetObject("$this.Icon")));this.Name="SpeedDialog";this.Text="欢迎进入我弹珠游戏";this.TransparencyKey=System.Drawing.Color.Transparent;this.Load+=newSystem.EventHandler(this.SpeedDialog_Load);this.groupBox1.ResumeLayout(false);((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).EndInit();this.ResumeLayout(false);} #endregionprivatevoidSlowRadio_CheckedChanged(objectsender，System.EventArgse){}privatevoidbutton1_Click(objectsender，System.EventArgse){}privatevoidMediumRadio_CheckedChanged(objectsender，EventArgse){}privatevoidFastRadio_CheckedChanged(objectsender，EventArgse){}privatevoidbutton2_Click(objectsender，EventArgse){Application.Exit();}privatevoidbutton3_Click(objectsender，EventArgse){Form2SpeedDialog=newForm2();SpeedDialog.ShowDialog();this.Speed=SpeedDialog.Speed;}privatevoidbutton4_Click(objectsender，EventArgse){Form3SpeedDialog=newForm3();SpeedDialog.ShowDialog();}privatevoidSlowRadio_CheckedChanged_1(objectsender，EventArgse){}privatevoidMediumRadio_CheckedChanged_1(objectsender，EventArgse){}privatevoidFastRadio_CheckedChanged_1(objectsender，EventArgse){}privatevoidSpeedDialog_Load(objectsender，EventArgse){}privatevoidpictureBox1_Click(objectsender，EventArgse){} }}2.游戏协助：在游戏协助后，就会跳出一种协助界面。阅读协助后关闭协助，然后选取难度进行游戏。图2游戏协助此界面代码为：usingSystem;usingSystem.Collections.Generic;usingSystem.ComponentModel;usingSystem.Data;usingSystem.Drawing;usingSystem.Text;usingSystem.Windows.Forms;namespaceBrickOut{publicpartialclassForm3：Form{publicForm3(){InitializeComponent();}privatevoidForm3_Load(objectsender，EventArgse){}}}3.选取游戏难度：在玩家将游戏协助理解后来，接下来就会进行游戏难度选取，玩家依照对游戏操作纯熟限度不同选取相应游戏难度。图3游戏难度选取界面此界面代码为：usingSystem;usingSystem.Collections.Generic;usingSystem.ComponentModel;usingSystem.Data;usingSystem.Drawing;usingSystem.Text;usingSystem.Windows.Forms;namespaceBrickOut{publicpartialclassForm2：Form{publicForm2(){InitializeComponent();}privatevoidbutton1_Click(objectsender，EventArgse){this.Close();}privatevoidSlowRadio_CheckedChanged_1(objectsender，EventArgse){}privatevoidMediumRadio_CheckedChanged(objectsender，EventArgse){}privatevoidpanel1_Paint(objectsender，PaintEventArgse){}}}4.开始游戏：在玩家选取游戏难度后，单击拟定，然后单击“开始游戏”按钮，进入游戏。图4游戏开始界面5.游戏结束：游戏结束有两种成果，玩家将所有砖块都打完和玩家将三次机会都挥霍掉。以上三个界面代码为：usingSystem;usingSystem.Drawing;usingSystem.Collections;usingSystem.ComponentModel;usingSystem.Windows.Forms;usingSystem.Data;usingSystem.Runtime.InteropServices;usingSystem.Threading;namespaceBrickOut{ publicclassForm1：System.Windows.Forms.Form {privateSystem.ComponentModel.IContainercomponents;privateconstintkNumberOfRows=8;privateconstintkNumberOfTries=3;privateintNumTotalBricks=0;privateintNumBalls=0;privateBallTheBall=newBall();privatePaddleThePaddle=newPaddle();privateSystem.Windows.Forms.Timertimer1;privateRow[]Rows=newRow[kNumberOfRows];privateScoreTheScore=null;privateThreadoThread=null;[DllImport("winmm.dll")]publicstaticexternlongPlaySound(StringlpszName，longhModule，longdwFlags); publicForm1() { InitializeComponent();for(inti=0；i<kNumberOfRows；i++){Rows[i]=newRow(i);}ThePaddle.Position.X=5;ThePaddle.Position.Y=this.ClientRectangle.Bottom-ThePaddle.Height;TheBall.Position.Y=this.ClientRectangle.Bottom-200;this.SetBounds(this.Left，this.Top，Rows[0].GetBounds().Width，this.Height)；TheScore=newScore(ClientRectangle.Right-50，ClientRectangle.Bottom-180);SpeedDialogdlg=newSpeedDialog();if(dlg.ShowDialog()==DialogResult.OK){timer1.Interval=dlg.Speed;} } protectedoverridevoidDispose(booldisposing) { if(disposing) { if(components!=null) { components.Dispose(); } } base.Dispose(disposing); }privatestringm_strCurrentSoundFile="BallOut.wav";publicvoidPlayASound(){if(m_strCurrentSoundFile.Length>0){}m_strCurrentSoundFile="";oThread.Abort();}publicvoidPlaySoundInThread(stringwavefile){m_strCurrentSoundFile=wavefile;oThread=newThread(newThreadStart(PlayASound));oThread.Start();} #regionWindowsFormDesignergeneratedcode privatevoidInitializeComponent() {ponents=newSystem.ComponentModel.Container();System.ComponentModel.ComponentResourceManagerresources=newSystem.ComponentModel.ComponentResourceManager(typeof(Form1));this.timer1=newSystem.Windows.Forms.Timer(ponents);this.SuspendLayout();this.timer1.Tick+=newSystem.EventHandler(this.timer1_Tick);this.AutoScaleBaseSize=newSystem.Drawing.Size(6，14);this.ClientSize=newSystem.Drawing.Size(552，389);this.Icon=((System.Drawing.Icon)(resources.GetObject("$this.Icon")));this.KeyPreview=true;this.Name="Form1";this.Text="打砖块";this.Paint+=newSystem.Windows.Forms.PaintEventHandler(this.Form1_Paint);this.KeyDown+=newSystem.Windows.Forms.KeyEventHandler(this.Form1_KeyDown);this.Load+=newSystem.EventHandler(this.Form1_Load);this.ResumeLayout(false);} #endregion [STAThread] staticvoidMain() { Application.Run(newForm1()); }privatevoidForm1_Paint(objectsender，System.Windows.Forms.PaintEventArgse){Graphicsg=e.Graphics;g.FillRectangle(Brushes.White，0，0，this.ClientRectangle.Width，this.ClientRectangle.Height);TheScore.Draw(g);ThePaddle.Draw(g);DrawRows(g);TheBall.Draw(g);}privatevoidDrawRows(Graphicsg){for(inti=0；i<kNumberOfRows；i++){Rows[i].Draw(g);}}privatevoidCheckForCollision(){if(TheBall.Position.X<0){TheBall.XStep*=-1;TheBall.Position.X+=TheBall.XStep;PlaySoundInThread("WallHit.wav");}if(TheBall.Position.Y<0){TheBall.YStep*=-1;TheBall.Position.Y+=TheBall.YStep;PlaySoundInThread("WallHit.wav");}if(TheBall.Position.X>this.ClientRectangle.Right-TheBall.Width){TheBall.XStep*=-1;TheBall.Position.X+=TheBall.XStep;PlaySoundInThread("WallHit.wav");}if(TheBall.Position.Y>this.ClientRectangle.Bottom-TheBall.YStep){IncrementGameBalls();Reset();PlaySoundInThread("BallOut.wav");}if(RowsCollide(TheBall.Position)){TheBall.YStep*=-1;PlaySoundInThread("BrickHit.wav");}inthp=HitsPaddle(TheBall.Position);if(hp>-1){PlaySoundInThread("PaddleHit.wav");switch(hp){case1:TheBall.XStep=-7;TheBall.YStep=-3;break;case2:TheBall.XStep=-5;TheBall.YStep=-5;break;case3:TheBall.XStep=5;TheBall.YStep=-5;break;default:TheBall.XStep=7;TheBall.YStep=-3;break;}}}privateintHitsPaddle(Pointp){RectanglePaddleRect=ThePaddle.GetBounds();if(p.Y>=this.ClientRectangle.Bottom-(PaddleRect.Height+TheBall.Height)){if((p.X>PaddleRect.Left)&&(p.X<PaddleRect.Right)){if((p.X>PaddleRect.Left)&&(p.X<=PaddleRect.Left+PaddleRect.Width/4))return1;elseif((p.X>PaddleRect.Left+PaddleRect.Width/4)&&(p.X<=PaddleRect.Left+PaddleRect.Width/2))return2;elseif((p.X>PaddleRect.Left+PaddleRect.Width/2)&&(p.X<=PaddleRect.Right-PaddleRect.Width/2))return3;elsereturn4;}}return-1;}privatevoidIncrementGameBalls(){NumBalls++;if(NumBalls>=kNumberOfTries){timer1.Stop();stringmsg="游戏结束，您一共打了"+NumTotalBricks;if(NumTotalBricks==1)msg+="brick.";elsemsg+="bricks."+"继续努力哦！";MessageBox.Show(msg);Application.Exit();}}privatevoidReset(){TheBall.XStep=5;TheBall.YStep=5;TheBall.Position.Y=this.ClientRectangle.Bottom-190;TheBall.Position.X=5;timer1.Stop();TheBall.UpdateBounds();Invalidate(TheBall.GetBounds());}privateintSumBricks(){intsum=0;for(inti=0；i<kNumberOfRows；i++){sum+=Rows[i].BrickOut;}returnsum;}privateboolRowsCollide(Pointp){for(inti=0；i<kNumberOfRows；i++){if(Rows[i].Collides(TheBall.GetBounds())){RectanglerRow=Rows[i].GetBounds();Invalidate(rRow);returntrue;}}returnfalse;}privatevoidtimer1_Tick(objectsender，System.EventArgse){TheBall.UpdateBounds();Invalidate(TheBall.GetBounds());TheBall.Move();TheBall.UpdateBounds();Invalidate(TheBall.GetBounds());CheckForCollision();NumTotalBricks=SumBricks();TheScore.Count=NumTotalBricks;Invalidate(TheScore.GetFrame());if(NumTotalBricks==kNumberOfRows*Row.kNumberOfBricks){timer1.Stop();Form4Form1=newForm4();Form1.ShowDialog();Application.Exit();}}privatevoidForm1_KeyDown(objectsender，System.Windows.Forms.KeyEventArgse){stringresult=e.KeyData.ToString();Invalidate(ThePaddle.GetBounds());switch(result){case"Left":ThePaddle.MoveLeft();Invalidate(ThePaddle.GetBounds());if(timer1.Enabled==false)timer1.Start();break;case"Right":ThePaddle.MoveRight(ClientRectangle.Right);Invalidate(ThePaddle.GetBounds());if(timer1.Enabled==false)timer1.Start();break;default:break;}}privatevoidForm1_Load(objectsender，EventArgse){} }}四、遇到问题和解决办法1.错误：图片途径错误，在做此程序时候对游戏中浮现挡板进行选取时候，选取了在桌面上图片，日后将此程序拷到自己电脑上时候运营代码浮现了途径错误。图一：途径错误解决方案：将图片重新拷到游戏文献夹中，并且将途径改到相应游戏文献夹中，在此拷贝时候就不会导致图片损坏和丢失。2.错误：游戏结束时由于缺少结束代码，使得游戏虽然结束，但是窗口无法结束，导致窗口无限堆叠，使程序变成死循环。解决方案：在窗口form1中加入代码timer1.Stop();用来结束前一种窗口。五、课程设计总结通过两周课程设计，使我对C#编程有了更深一层理解。在这两周课程设计中我不断地改错，不断调试，我努力终于有了成果。最让我受益匪浅是整个设计过程，这个过程也是我不断学习一种过程，咱们在运用旧知识同步也学到了不少新知识。本次课程设计我发现自己对知识掌握还存在着诸多局限性之处，同步我也明白了自己尚有哪些地方需要改进，自己要在哪些地方进行自我提高。尤为重要是，这次课程设计使咱们懂得了理论与实际相结合是很重要。在这次课程设计中，我虽然遇到某些困难，但我仍能坚持克服。通过这个小小课题，我也学到了某些课外东西，多谢学校给了我一次体验机会，谢谢教师在我困难时候给我指引，也谢谢在这段时间给过咱们协助同窗。在此期间我也失落过，也曾一度热情高涨。从开始时满腹盛激情到最后汗水背后复杂心情，点点滴滴无不令我回味无穷。课程设计是培养学生综合运用所学知识,发现,提出,分析和解决实际问题,锻炼实践能力重要环节,是对学生实际工作能力详细训练和考察过程.随着科学技术发展日新月异，编程已经成为当今计算机应用中空前活跃领域，在生活中可以说得是无处不在。在设计过程中,咱们遇到许多无法解决问题,都一一通过网络解决了,同步还问过许多学得比较夯实同窗,是她们让咱们有了更多理解,更好让咱们在这个问题上着手设计.这次课程设计终于顺利完毕了，在设计中遇到了诸多编程问题，最后在教师细心指引下，终于得到解决。同步，在教师身上我学得到诸多实用知识，在次我表达感谢！对给过我协助所有同窗和各位指引教师再次表达忠心感谢！六、参照文献[1]郑阿奇、梁敬东、钱晓军等，c#实用教程，电子工业出版社，。[2]钱雪忠、黄学光等，数据库原理及应用，北京邮电大学出版社，。[3]王进强.VisualBasic.Net基本教程[M]，北京：清华大学出版社，。附录（源程序代码）usingSystem;usingSystem.Drawing;usingSystem.Collections;usingSystem.ComponentModel;usingSystem.Windows.Forms;usingSystem.Data;usingSystem.Runtime.InteropServices;usingSystem.Threading;namespaceBrickOut{ publicclassForm1：System.Windows.Forms.Form {privateSystem.ComponentModel.IContainercomponents;privateconstintkNumberOfRows=8;privateconstintkNumberOfTries=3;privateintNumTotalBricks=0;privateintNumBalls=0;privateBallTheBall=newBall();privatePaddleThePaddle=newPaddle();privateSystem.Windows.Forms.Timertimer1;privateRow[]Rows=newRow[kNumberOfRows];privateScoreTheScore=null;privateThreadoThread=null;[DllImport("winmm.dll")]publicstaticexternlongPlaySound(StringlpszName，longhModule，longdwFlags); publicForm1() { InitializeComponent();for(inti=0；i<kNumberOfRows；i++){Rows[i]=newRow(i);}ThePaddle.Position.X=5;ThePaddle.Position.Y=this.ClientRectangle.Bottom-ThePaddle.Height;TheBall.Position.Y=this.ClientRectangle.Bottom-200;this.SetBounds(this.Left，this.Top，Rows[0].GetBounds().Width，this.Height)；TheScore=newScore(ClientRectangle.Right-50，ClientRectangle.Bottom-180);//chooseLevelSpeedDialogdlg=newSpeedDialog();if(dlg.ShowDialog()==DialogResult.OK){timer1.Interval=dlg.Speed;} // //TODO：AddanyconstructorcodeafterInitializeComponentcall // } ///<summary> ///Cleanupanyresourcesbeingused. ///</summary> protectedoverridevoidDispose(booldisposing) { if(disposing) { if(components!=null) { components.Dispose(); } } base.Dispose(disposing); }privatestringm_strCurrentSoundFile="BallOut.wav";publicvoidPlayASound(){if(m_strCurrentSoundFile.Length>0){PlaySound(Application.StartupPath+"\\"+m_strCurrentSoundFile，0，0);}m_strCurrentSoundFile="";oThread.Abort();}publicvoidPlaySoundInThread(stringwavefile){m_strCurrentSoundFile=wavefile;oThread=newThread(newThreadStart(PlayASound));oThread.Start();} #regionWindowsFormDesignergeneratedcode ///<summary> ///RequiredmethodforDesignersupport-donotmodify ///thecontentsofthismethodwiththecodeeditor. ///</summary> privatevoidInitializeComponent() {ponents=newSystem.ComponentModel.Container();this.timer1=newSystem.Windows.Forms.Timer(ponents);this.SuspendLayout();////timer1//this.timer1.Tick+=newSystem.EventHandler(this.timer1_Tick);////Form1//this.AutoScaleBaseSize=newSystem.Drawing.Size(6，14);this.ClientSize=newSystem.Drawing.Size(552，389);this.KeyPreview=true;this.Name="Form1";this.Text="BrickOut";this.Paint+=newSystem.Windows.Forms.PaintEventHandler(this.Form1_Paint);this.KeyDown+=newSystem.Windows.Forms.KeyEventHandler(this.Form1_KeyDown);this.Load+=newSystem.EventHandler(this.Form1_Load);this.ResumeLayout(false);} #endregion ///<summary> ///Themainentrypointfortheapplication. ///</summary> [STAThread] staticvoidMain() { Application.Run(newForm1()); }privatevoidForm1_Paint(objectsender，System.Windows.Forms.PaintEventArgse){Graphicsg=e.Graphics;g.FillRectangle(Brushes.White，0，0，this.ClientRectangle.Width，this.ClientRectangle.Height);TheScore.Draw(g);ThePaddle.Draw(g);DrawRows(g);TheBall.Draw(g);}privatevoidDrawRows(Graphicsg){for(inti=0；i<kNumberOfRows；i++){Rows[i].Draw(g);}}privatevoidCheckForCollision(){if(TheBall.Position.X<0)//hittheleftside，switchpolarity{TheBall.XStep*=-1;TheBall.Position.X+=TheBall.XStep;PlaySoundInThread("WallHit.wav");}if(TheBall.Position.Y<0)//hitthetopoftheform，switchpolarity{TheBall.YStep*=-1;TheBall.Position.Y+=TheBall.YStep;PlaySoundInThread("WallHit.wav");}if(TheBall.Position.X>this.ClientRectangle.Right-TheBall.Width)//hittheleftside，switchpolarity{TheBall.XStep*=-1;TheBall.Position.X+=TheBall.XStep;PlaySoundInThread("WallHit.wav");}if(TheBall.Position.Y>this.ClientRectangle.Bottom-TheBall.YStep)//losttheball!{IncrementGameBalls();Reset();PlaySoundInThread("BallOut.wav");}if(RowsCollide(TheBall.Position)){TheBall.YStep*=-1;PlaySoundInThread("BrickHit.wav");}inthp=HitsPaddle(TheBall.Position);if(hp>-1)//losttheball!{PlaySoundInThread("PaddleHit.wav");switch(hp){case1:TheBall.XStep=-7;TheBall.YStep=-3;break;case2:TheBall.XStep=-5;TheBall.YStep=-5;break;case3:TheBall.XStep=5;TheBall.YStep=-5;break;default:TheBall.XStep=7;TheBall.YStep=-3;break;}}}privateintHitsPaddle(Pointp){RectanglePaddleRect=ThePaddle.GetBounds();if(p.Y>=this.ClientRectangle.Bottom-(PaddleRect.Height+TheBall.Height)){if((p.X>PaddleRect.Left)&&(p.X<PaddleRect.Right)){if((p.X>PaddleRect.Left)&&(p.X<=PaddleRect.Left+PaddleRect.Width/4))return1;elseif((p.X>PaddleRect.Left+PaddleRect.Width/4)&&(p.X<=PaddleRect.Left+PaddleRect.Width/2))return2;elseif((p.X>PaddleRect.Left+PaddleRect.Width/2)&&(p.X<=PaddleRect.Right-PaddleRect.Width/2))return3;