ArcEngine实现空间拓扑空间关联空间距离运算文档格式.docx
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A4…………ICurve3接口
A5…………ISegment接口
A6…………ICircularArc接口
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写在前面：
使用空间分析的时候，会提示这样的错误“异常来自HRESULT:
0x80040215”，其原因就是：
在使用ITopologicalOperator求交集等操作的时候，
有时会出现“HRESULT:
0x80040215”这个异常，
原来是空间参考不一样所致。
因此只要SpatialReference
属性设为同一空间参考就不会出现“HRESULT:
0x80040215”异常。
所以在进行空间分析之前，要保证所建立的shapefile文件具有相同的SpatialReference！
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╠════╣第A1个╠══════════════════════════════════════════════════╣
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●ITopologicalOperator5接口：
1.Providesadditionalinformationonnon-simplegeometries.【拓扑操作】
Members
Description
Boundary
返回值：
IGeometry
Theboundaryofthisgeometry.Apolygon'
sboundaryisapolyline.Apolyline'
sboundaryisamultipoint.Apointormultipoint'
sboundaryisanemptypointormultipoint.
Buffer
（doubledistance）
IGeometry
Constructsapolygonthatisthelocusofpointsatadistancelessthanorequaltoaspecifieddistancefromthisgeometry.
通过给定距离，得到操作图形的缓冲区，返回得到缓冲区几何图形！
但是这里面的距离很是蹊跷，同时实验发现，我写入0.01的时候，大约表示1km，所以大约是1:
100000的关系！
Clip
（IEnvelopeclipperEnvelope）
Constructstheintersectionofthisgeometryandthespecifiedenvelope.
返回矩形部分的要素，直接作用在要素上面！
ClipDense
Constructstheintersectionofthisgeometryandthespecifiedenvelope;
densifieslinesinoutputcontributedbytheclippingenvelope.
ClipEx
ClipToDomain
Clipsthegeometrytothedomainofthespatialreference.Usefulforensuringthatbufferscanbefitwithinthespatialdomainofthefeatureclasstowhichtheyarebeingadded.
ConstructUnion
Definesthisgeometrytobetheunionoftheinputs.MoreefficientforunioningmultiplegeometriesthancallingUnionrepeatedly.
ConvexHull
Constructstheconvexhullofthisgeometry.
Cut
Splitsthisgeometryintoapartleftofthecuttingpolyline,andapartrightofit.
Cut2
Dividesageometryintomultipleparts
Difference
Constructsthegeometrycontainingpointsfromthisgeometrybutnottheothergeometry.
GeoNormalizeEx
Shiftslongitudes,ifneedbe,intoacontinuousrangeof360degrees.
Intersect
Constructsthegeometrythatistheset-theoreticintersectionoftheinputgeometries.UsedifferentresultDimensionvaluestogenerateresultsofdifferentdimensions.
IntersectMultidimension
Constructstheset-theoreticintersectionoftheinputs.Theresultsarereturnedinageometrybagwithoneelementperresultdimension.
IsKnownSimple
Indicateswhetherthisgeometryisknown（orassumed）tobetopologicallycorrect.
IsSimple
Indicateswhetherthisgeometryisknown（orassumed）tobetopologicallycorrect,afterexplicitlydeterminingthisifthegeometryisnotalreadyknown（orassumed）tobesimple.
IsSimpleEx
Determineswhyageometryisnotsimple.Currentlyonlyimplementedforpolygons.
QueryClipped
RedefinesclippedGeometrytobetheintersectionofthisgeometryandtheclippingenvelope.
QueryClippedDense
RedefinesclippedGeometrytobetheintersectionofthisgeometryandtheclippingenvelope;
densifieslinesintheoutputcontributedbytheclippingenvelope.
Simplify
Makesthisgeometrytopologicallycorrect.
SymmetricDifference
Constructsthegeometrythatcontainspointsfromeitherbutnotbothinputgeometries.
Union
Constructsthegeometrythatistheset-theoreticunionoftheinputgeometries.
CoClassesthatimplementITopologicalOperator
CoClassesandClasses
GeoEllipse（esriDefenseSolutions）
Itsaspheroidalellipse.
GeometryBag
AnorderedcollectionofobjectsthatsupporttheIGeometryinterface.
GeoPolygon（esriDefenseSolutions）
Itsaspheroidalpolygon.
GeoPolyline（esriDefenseSolutions）
Thisisaspheroidalpolyline.
MultiPatch
Acollectionofsurfacepatches.
Multipoint
Anorderedcollectionofpoints;
optionallyhasmeasure,heightandIDattributes.
Point
Atwodimensionalpoint,optionallywithmeasure,height,andIDattributes.
Polygon
Acollectionofringsorderedbytheircontainmentrelationship;
Polyline
Anorderedcollectionofpaths;
※|※→公共代码部分：
//公共变量！
~
IMappMap;
IActiveViewpActiveView;
IEnvelopepEnv;
ISelectionEnvironmentpSelectionEnv;
IEnumFeaturepEnumFeature;
IGraphicsContainerpGraphicsContainer;
IFeaturepFeature;
IGeometrypGeometry;
IEnvelopepEnvClip;
IPolylinepLineCut;
IPolygonpFirstPolygon;
//鼠标点击事件！
privatevoidaxMapControl1_OnMouseDown（objectsender,IMapControlEvents2_OnMouseDownEvente）
{
axMapControl1.MousePointer=esriControlsMousePointer.esriPointerCrosshair;
if（isClip）//此时要拉Clip框
{
pEnvClip=axMapControl1.TrackRectangle（）;
isClip=false;
}
elseif（isCut）
pLineCut=axMapControl1.TrackLine（）asIPolyline;
isCut=false;
elseif（isFirstIn）
pMap=axMapControl1.Map;
pActiveView=pMapasIActiveView;
pEnv=axMapControl1.TrackRectangle（）;
pSelectionEnv=newSelectionEnvironment（）;
pSelectionEnv.DefaultColor=GetColor（0,255,0）;
pMap.SelectByShape（pEnv,pSelectionEnv,false）;
pActiveView.Refresh（）;
pEnumFeature=axMapControl1.Map.FeatureSelectionasIEnumFeature;
else
pSelectionEnv.DefaultColor=GetColor（255,0,0）;
}
//RGB颜色！
privateIRgbColorGetColor（intr,intg,intb）
IRgbColorpColor=newRgbColor（）;
pColor.Red=r;
pColor.Green=g;
pColor.Blue=b;
returnpColor;
※|※→Buffer：
privatevoidbutton1_Click（objectsender,EventArgse）
while（true）
pGraphicsContainer=pMapasIGraphicsContainer;
//定义容器
pFeature=pEnumFeature.Next（）;
//遍历要素
if（pFeature==null）//若不存在要素，则推出循环
break;
pGeometry=pFeature.Shape;
//获取要素的Geometry
ITopologicalOperatorpTopoOperator=pGeometryasITopologicalOperator;
//QI到拓扑操作
IGeometrypBufferGeo=pTopoOperator.Buffer
（2）;
//缓冲区分析
IElementpElement=newPolygonElement（）;
pElement.Geometry=pBufferGeo;
//获取得到的缓冲区
pGraphicsContainer.AddElement（pElement,0）;
//显示缓冲区
※|※→Boundary：
privatevoidbutton2_Click（objectsender,EventArgse）
IGeometrypBoundary=pTopoOperator.Boundary;
//获取边界
ILineElementpLineEle=newLineElementClass（）;
ISimpleLineSymbolpSLS=newSimpleLineSymbol（）;
IRgbColorpColor=GetColor（0,255,0）;
pSLS.Color=pColor;
pSLS.Width=5;
pLineEle.Symbol=pSLS;
IElementpElement=pLineEleasIElement;
pElement.Geometry=pBoundary;
//显示边界
※|※→Clip：
boolisClip=false;
privatevoidbutton3_Click（objectsender,EventArgse）
isClip=true;
privatevoidbutton4_Click（objectsender,EventArgse）
pTopoOperator.Clip（pEnvClip）;
pElement.Geometry=pGeometry;
※|※→ConvexHull：
privatevoidbutton5_Click（objectsender,EventArgse）
IGeometrypBufferGeo=pTopoOperator.ConvexHull（）;
※|※→Cut：
boolisCut=false;
privatevoidbutton6_Click（objectsender,EventArgse）
isCut=true;
privatevoidbutton7_Click（objectsender,EventArgse）
//QI到拓扑操作ry
IGeometrypGeoRight=newPolygonClass（）;
IGeometrypGeoLeft=newPolygonClass（）;
pTopoOperator.Cut（pLineCut,outpGeoLeft,outpGeoRight）;
IElementpElement=newPolygonEle
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