# AE实现空间分析

1.熟悉 ITopologicalOperator 接口(用于空间拓扑运算)的使用
2.熟悉 IRelationalOperator 接口(用于空间关联运算)的使用
3.熟悉 IProximityOperator 接口(用于空间距离运算)的使用

# ●·● 目录：

A2 ………… IRelationalOperator 接口

A3 ………… IPoint 接口
A4 ………… ICurve3 接口
A5 ………… ISegment 接口
A6 ………… ICircularArc 接口

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```在使用 ITopologicalOperator求交集等操作的时候，

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# ●·● ITopologicalOperator5 接口：

1. Provides additional information on non-simple geometries.【拓扑操作】

#### Members

Description
Boundary

The boundary of this geometry. A polygon’s boundary is a polyline. A polyline’s boundary is a multipoint. A point or multipoint’s boundary is an empty point or multipoint.
Buffer
(double distance)

Constructs a polygon that is the locus of points at a distance less than or equal to a specified distance from this geometry.

Clip
(IEnvelope clipperEnvelope)
Constructs the intersection of this geometry and the specified envelope.

ClipDense Constructs the intersection of this geometry and the specified envelope; densifies lines in output contributed by the clipping envelope.
ClipEx Constructs the intersection of this geometry and the specified envelope.
ClipToDomain Clips the geometry to the domain of the spatial reference. Useful for ensuring that buffers can be fit within the spatial domain of the feature class to which they are being added.
ConstructUnion Defines this geometry to be the union of the inputs. More efficient for unioning multiple geometries than calling Union repeatedly.
ConvexHull Constructs the convex hull of this geometry.
Cut Splits this geometry into a part left of the cutting polyline, and a part right of it.
Cut2 Divides a geometry into multiple parts
Difference Constructs the geometry containing points from this geometry but not the other geometry.
GeoNormalizeEx Shifts longitudes, if need be, into a continuous range of 360 degrees.
Intersect Constructs the geometry that is the set-theoretic intersection of the input geometries. Use different resultDimension values to generate results of different dimensions.
IntersectMultidimension Constructs the set-theoretic intersection of the inputs. The results are returned in a geometry bag with one element per result dimension.
IsKnownSimple Indicates whether this geometry is known (or assumed) to be topologically correct.
IsKnownSimple Indicates whether this geometry is known (or assumed) to be topologically correct.
IsSimple Indicates whether this geometry is known (or assumed) to be topologically correct, after explicitly determining this if the geometry is not already known (or assumed) to be simple.
IsSimpleEx Determines why a geometry is not simple. Currently only implemented for polygons.
QueryClipped Redefines clippedGeometry to be the intersection of this geometry and the clipping envelope.
QueryClippedDense Redefines clippedGeometry to be the intersection of this geometry and the clipping envelope; densifies lines in the output contributed by the clipping envelope.
Simplify Makes this geometry topologically correct.
SymmetricDifference Constructs the geometry that contains points from either but not both input geometries.
Union Constructs the geometry that is the set-theoretic union of the input geometries.

#### CoClasses that implement ITopologicalOperator

CoClasses and Classes Description
GeoEllipse
(esriDefenseSolutions)
Its a spheroidal ellipse.
GeometryBag An ordered collection of objects that support the IGeometry interface.
GeoPolygon
(esriDefenseSolutions)
Its a spheroidal polygon.
GeoPolyline
(esriDefenseSolutions)
This is a spheroidal polyline.
MultiPatch A collection of surface patches.
Multipoint An ordered collection of points; optionally has measure, height and ID attributes.
Point A two dimensional point, optionally with measure, height, and ID attributes.
Polygon A collection of rings ordered by their containment relationship; optionally has measure, height and ID attributes.
Polyline An ordered collection of paths; optionally has measure, height and ID attributes.

## ※ | ※ → 公共代码部分：

//公共变量！~

```IMap pMap;
IActiveView pActiveView;
IEnvelope pEnv;
ISelectionEnvironment pSelectionEnv;
IEnumFeature pEnumFeature;
IGraphicsContainer pGraphicsContainer;
IFeature pFeature;
IGeometry pGeometry;
IEnvelope pEnvClip;
IPolyline pLineCut;
IPolygon pFirstPolygon;```

//鼠标点击事件！~

```private void axMapControl1_OnMouseDown(object sender, IMapControlEvents2_OnMouseDownEvent e)
{
axMapControl1.MousePointer = esriControlsMousePointer.esriPointerCrosshair;
if (isClip) //此时要拉Clip框
{
pEnvClip = axMapControl1.TrackRectangle();
isClip = false;
}
else if (isCut)
{
pLineCut = axMapControl1.TrackLine() as IPolyline;
isCut = false;
}
else if (isFirstIn)
{
pMap = axMapControl1.Map;
pActiveView = pMap as IActiveView;
pEnv = axMapControl1.TrackRectangle();

pSelectionEnv = new SelectionEnvironment();
pSelectionEnv.DefaultColor = GetColor(0, 255, 0);
pMap.SelectByShape(pEnv, pSelectionEnv, false);
pActiveView.Refresh();
pEnumFeature = axMapControl1.Map.FeatureSelection as IEnumFeature;
}
else
{
pMap = axMapControl1.Map;
pActiveView = pMap as IActiveView;
pEnv = axMapControl1.TrackRectangle();

pSelectionEnv = new SelectionEnvironment();
pSelectionEnv.DefaultColor = GetColor(255, 0, 0);
pMap.SelectByShape(pEnv, pSelectionEnv, false);
pActiveView.Refresh();
pEnumFeature = axMapControl1.Map.FeatureSelection as IEnumFeature;
}
}```

//RGB颜色！~

```private IRgbColor GetColor(int r, int g, int b)
{
IRgbColor pColor = new RgbColor();
pColor.Red = r;
pColor.Green = g;
pColor.Blue = b;
return pColor;
}```

## ※ | ※ → Buffer：

```private void button1_Click(object sender, EventArgs e)
{
while (true)
{
pGraphicsContainer = pMap as IGraphicsContainer;    //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
ITopologicalOperator pTopoOperator = pGeometry as ITopologicalOperator; //QI到拓扑操作
IGeometry pBufferGeo = pTopoOperator.Buffer(2);     //缓冲区分析

IElement pElement = new PolygonElement();
pElement.Geometry = pBufferGeo;     //获取得到的缓冲区

pActiveView.Refresh();
}
}```

## ※ | ※ → Boundary：

```private void button2_Click(object sender, EventArgs e)
{
while (true)
{
pGraphicsContainer = pMap as IGraphicsContainer;    //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
ITopologicalOperator pTopoOperator = pGeometry as ITopologicalOperator; //QI到拓扑操作
IGeometry pBoundary = pTopoOperator.Boundary;  //获取边界

ILineElement pLineEle = new LineElementClass();
ISimpleLineSymbol pSLS = new SimpleLineSymbol();
IRgbColor pColor = GetColor(0, 255, 0);
pSLS.Color = pColor;
pSLS.Width = 5;
pLineEle.Symbol = pSLS;

IElement pElement = pLineEle as IElement;
pElement.Geometry = pBoundary;

pActiveView.Refresh();
}
}```

## ※ | ※ → Clip：

```bool isClip = false;
private void button3_Click(object sender, EventArgs e)
{
isClip = true;
}

private void button4_Click(object sender, EventArgs e)
{
while (true)
{
pGraphicsContainer = pMap as IGraphicsContainer;    //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
ITopologicalOperator pTopoOperator = pGeometry as ITopologicalOperator; //QI到拓扑操作
pTopoOperator.Clip(pEnvClip);

IElement pElement = new PolygonElement();
pElement.Geometry = pGeometry;     //获取得到的缓冲区

pActiveView.Refresh();
}
}```

## ※ | ※ → ConvexHull：

```private void button5_Click(object sender, EventArgs e)
{
while (true)
{
pGraphicsContainer = pMap as IGraphicsContainer;    //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
ITopologicalOperator pTopoOperator = pGeometry as ITopologicalOperator; //QI到拓扑操作
IGeometry pBufferGeo = pTopoOperator.ConvexHull();

IElement pElement = new PolygonElement();
pElement.Geometry = pBufferGeo;     //获取得到的缓冲区

pActiveView.Refresh();
}
}```

## ※ | ※ → Cut：

```bool isCut = false;

private void button6_Click(object sender, EventArgs e)
{
isCut = true;
}

private void button7_Click(object sender, EventArgs e)
{
while (true)
{
pGraphicsContainer = pMap as IGraphicsContainer;    //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
ITopologicalOperator pTopoOperator = pGeometry as ITopologicalOperator; //QI到拓扑操作ry
IGeometry pGeoRight = new PolygonClass();
IGeometry pGeoLeft = new PolygonClass();
pTopoOperator.Cut(pLineCut, out pGeoLeft, out pGeoRight);

IElement pElement = new PolygonElement();

IFillShapeElement pFillEle = pElement as IFillShapeElement;
ISimpleFillSymbol pSFS = new SimpleFillSymbol();
pSFS.Color = GetColor(255, 255, 0);
pFillEle.Symbol = pSFS;

pElement.Geometry = pGeoLeft;     //获取得到的缓冲区

pSFS = new SimpleFillSymbol();
pSFS.Color = GetColor(255, 0, 255);
pFillEle.Symbol = pSFS;

pElement = new PolygonElement();
pElement.Geometry = pGeoRight;     //获取得到的缓冲区

pActiveView.Refresh();
}
}```

## ※ | ※ → Union：

```private void button8_Click(object sender, EventArgs e)
{
IGeometry pUnionGeo = new PolygonClass();
pGraphicsContainer = pMap as IGraphicsContainer;    //定义容器

while (true)
{
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
ITopologicalOperator pTopoOperator = pUnionGeo as ITopologicalOperator; //QI到拓扑操作ry
pUnionGeo = pTopoOperator.Union(pGeometry);
}

IElement pElement = new PolygonElement();

IFillShapeElement pFillEle = pElement as IFillShapeElement;
ISimpleFillSymbol pSFS = new SimpleFillSymbol();
pSFS.Color = GetColor(255, 255, 0);
pFillEle.Symbol = pSFS;

pElement.Geometry = pUnionGeo;     //获取得到的缓冲区

pActiveView.Refresh();
}```

## ※ | ※ → Intersect：

```bool isFirstIn = false;

private void button10_Click(object sender, EventArgs e)
{
isFirstIn = true;
}

private void button11_Click(object sender, EventArgs e)
{
isFirstIn = false;
pFirstPolygon = new PolygonClass();
while (true)
{
pFeature = pEnumFeature.Next();
if (pFeature == null)
break;
pGeometry = pFeature.Shape;
ITopologicalOperator pTopoOperator = pFirstPolygon as ITopologicalOperator;
pFirstPolygon = pTopoOperator.Union(pGeometry) as IPolygon;
}
}

private void button12_Click(object sender, EventArgs e)
{
IGeometry pIntersectGeo = new PolygonClass();
IGeometry pSecondPolygon = new PolygonClass();
pGraphicsContainer = pMap as IGraphicsContainer;

while (true)
{
pFeature = pEnumFeature.Next();
if (pFeature == null)
break;
pGeometry = pFeature.Shape;
ITopologicalOperator pTopoOperator = pSecondPolygon as ITopologicalOperator;
pSecondPolygon = pTopoOperator.Union(pGeometry) as IPolygon;
}

ITopologicalOperator pTopo = pSecondPolygon as ITopologicalOperator;
pIntersectGeo = pTopo.Intersect(pFirstPolygon, esriGeometryDimension.esriGeometry2Dimension) as  IPolygon;
IElement pElement = new PolygonElementClass();
pElement.Geometry = pIntersectGeo;
IFeatureLayer pFeatureLayer = pMap.get_Layer(0) as IFeatureLayer;
pFeatureLayer.Visible = false;
pFeatureLayer = pMap.get_Layer(1) as IFeatureLayer;
pFeatureLayer.Visible = false;
pActiveView.Refresh();
}```

## ※ | ※ → Difference：（需要前面两部分）

```private void button13_Click(object sender, EventArgs e)
{
IGeometry pIntersectGeo = new PolygonClass();
IGeometry pSecondPolygon = new PolygonClass();
pGraphicsContainer = pMap as IGraphicsContainer;

while (true)
{
pFeature = pEnumFeature.Next();
if (pFeature == null)
break;
pGeometry = pFeature.Shape;
ITopologicalOperator pTopoOperator = pSecondPolygon as ITopologicalOperator;
pSecondPolygon = pTopoOperator.Union(pGeometry) as IPolygon;
}

ITopologicalOperator pTopo = pSecondPolygon as ITopologicalOperator;
pIntersectGeo = pTopo.Difference(pFirstPolygon) as IPolygon;
IElement pElement = new PolygonElementClass();
pElement.Geometry = pIntersectGeo;
IFeatureLayer pFeatureLayer = pMap.get_Layer(0) as IFeatureLayer;
pFeatureLayer.Visible = false;
pFeatureLayer = pMap.get_Layer(1) as IFeatureLayer;
pFeatureLayer.Visible = false;
pActiveView.Refresh();
}```

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# ●·● IRelationalOperator 接口：

1. Provides access to members that determine if a certain spatial relationship exists between two geometries.

#### Members

Description
Contains Indicates if this geometry contains the other geometry.

Crosses Indicates if the two geometries intersect in a geometry of lesser dimension.
Disjoint Indicates if the two geometries share no points in common. Negate this result to compute the Intersect relation.
Equals Indicates if the two geometries are of the same type and define the same set of points in the plane.
Overlaps Indicates if the intersection of the two geometries has the same dimension as one of the input geometries.

Relation Indicates if the defined relationship exists.
Touches Indicates if the boundaries of the geometries intersect.
Within Indicates if this geometry is contained (is within) another geometry.

#### CoClasses that implement IRelationalOperator

CoClasses and Classes Description
Envelope A rectangle with sides parallel to a coordinate system defining the extent of another geometry; optionally has min and max measure, height and ID attributes.
GeometryBag An ordered collection of objects that support the IGeometry interface.
MultiPatch A collection of surface patches.
Multipoint An ordered collection of points; optionally has measure, height and ID attributes.
Point A two dimensional point, optionally with measure, height, and ID attributes.
Polygon A collection of rings ordered by their containment relationship; optionally has measure, height and ID attributes.
Polyline An ordered collection of paths; optionally has measure, height and ID attributes.

## ※ | ※ → 公共代码部分：

```IMap pMap;
IActiveView pActiveView;
IEnvelope pEnv;
ISelectionEnvironment pSelectionEnv;
IEnumFeature pEnumFeature;
IFeature pFeature;
IGeometry pGeometry;
IGeometry pBasicGeo;```
```private void axMapControl1_OnMouseDown(object sender, IMapControlEvents2_OnMouseDownEvent e)
{
axMapControl1.MousePointer = esriControlsMousePointer.esriPointerCrosshair;
pMap = axMapControl1.Map;
pActiveView = pMap as IActiveView;
pEnv = axMapControl1.TrackRectangle();
pSelectionEnv = new SelectionEnvironment();
pSelectionEnv.DefaultColor = GetColor(255, 0, 0);
pMap.SelectByShape(pEnv, pSelectionEnv, false);
pActiveView.Refresh();
pEnumFeature = pMap.FeatureSelection as IEnumFeature;
}```
```private IRgbColor GetColor(int r, int g, int b)
{
IRgbColor pColor = new RgbColor();
pColor.Red = r;
pColor.Green = g;
pColor.Blue = b;
return pColor;
}```
```private IGeometry GetBasicGeometry()
{
IFeatureLayer pFeatureLayer = axMapControl1.Map.get_Layer(1) as IFeatureLayer;
IFeatureClass pFeatureClass = pFeatureLayer.FeatureClass;
IFeatureCursor pFeatureCursor = pFeatureClass.Search(null, false);
IFeature pF = pFeatureCursor.NextFeature();
IGeometry pUnionGeo = new PolygonClass();
pUnionGeo = pF.Shape;
while(pF != null)
{
ITopologicalOperator pUnionTopo = pUnionGeo as ITopologicalOperator;
pUnionGeo = pUnionTopo.Union(pF.Shape);
pF = pFeatureCursor.NextFeature();
}
return pUnionGeo;
}```
```private void Form1_Load(object sender, EventArgs e)
{
(axMapControl1.get_Layer(1) as IFeatureLayer).Selectable = false;
}```