I' ve modified an XNA example, which has a fish automatically swim a good thing, we can see.

ChaseAndEvade\ChaseAndEvade\ChaseAndEvade.png
.............\.............\ChaseAndEvadeWindows.csproj.Debug.cachefile
.............\.............\ChaseAndEvadeWindows.csproj.user
.............\.............\.ontent\10\0.png
.............\.............\.......\..\1.png
.............\.............\.......\..\10.png
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.............\.............\.......\..\Thumbs.db
.............\.............\.......\Arial.spritefont
.............\.............\.......\cat.tga
.............\.............\.......\Content.contentproj
.............\.............\.......\Content.contentproj.user
.............\.............\.......\mouse.png
.............\.............\.......\mouse1.png
.............\.............\.......\mouse2.tga
.............\.............\.......\obj\x86\Debug\Content.contentproj.FileListAbsolute.txt
.............\.............\.......\...\...\.....\ContentPipeline.xml
.............\.............\.......\...\...\.....\ResolveAssemblyReference.cache
.............\.............\.......\tank.tga
.............\.............\.......\Thumbs.db
.............\.............\Game.cs
.............\.............\Game.ico
.............\.............\MyBaseFunction.cs
.............\.............\MyChaseAndEvade.csproj
.............\.............\MyChaseAndEvade.sln
.............\.............\obj\x86\Debug\cachefile-{58A59C42-A415-4C04-B9D0-D7CA6B778996}-targetpath.txt
.............\.............\...\...\.....\ChaseAndEvade.exe
.............\.............\...\...\.....\ChaseAndEvade.pdb
.............\.............\...\...\.....\ChaseAndEvadeWindows.csproj.FileListAbsolute.txt
.............\.............\...\...\.....\Microsoft.Xna.Framework.RuntimeProfile.txt
.............\.............\...\...\.....\ResolveAssemblyReference.cache
.............\.............\Properties\AssemblyInfo.cs
.............\.............\UpgradeLog.XML
.............\Documentation\EvadeDiagram.png
.............\.............\MouseAI.png
.............\.............\TankAI.png
.............\.............\Thumbs.db
.............\.............\UnitCircle.png
.............\ChaseAndEvade\Content\obj\x86\Debug\Refactor
.............\.............\.......\...\...\.....\TempPE
.............\.............\.......\bin\x86\Debug
.............\.............\.......\obj\x86\Debug
.............\.............\obj\x86\Debug\Refactor
.............\.............\...\...\.....\TempPE
.............\.............\Content\bin\x86
.............\.............\.......\obj\x86
.............\.............\obj\x86\Debug
.............\.............\bin\x86
.............\.............\Content\10
.............\.............\.......\bin
.............\.............\.......\obj
.............\.............\obj\x86
.............\.............\bin
.............\.............\Content
.............\.............\obj
.............\.............\Properties
.............\ChaseAndEvade
.............\Documentation
ChaseAndEvade

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