geometry对应java是什么 geometry()

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mob64ca140f67e3 2024-01-09 21:52:09

文章标签 geometry对应java是什么图形 null path object 文章分类 Java 后端开发

CHINAZ

　　Geometry库中几个核心类和接口构成了Geometry对象的基本框架。 CHINAZ

　　GeometryEnvironment CHINAZ

　　GeometryEnvironment提供了从不同的输入、设置或获取全局变量来创建几何图形的方法，以便控制geometry方法的行为。GeometryEnvironment对象是一个单例对象。CHINAZ

以下为引用的内容：
public IPolyline TestGeometryEnvironment()
{ CHINAZ 
    ISpatialReferenceFactory spatialReferenceFactory = new SpatialReferenceEnvironmentClass();

    //Create a projected coordinate system and define its domain, resolution, and x,y tolerance.
    ISpatialReferenceResolution spatialReferenceResolution = spatialReferenceFactory.CreateProjectedCoordinateSystem((int)esriSRProjCSType.esriSRProjCS_NAD1983UTM_11N) asCHINAZ 
    spatialReferenceResolution.ConstructFromHorizon();
    ISpatialReferenceTolerance spatialReferenceTolerance = spatialReferenceResolution as ISpatialReferenceTolerance;
    spatialReferenceTolerance.SetDefaultXYTolerance();
    ISpatialReference spatialReference = spatialReferenceResolution as ISpatialReference;
        CHINAZ       

    //Create an array of WKSPoint structures starting in the middle of the x,y domain of the 
    //projected coordinate system.

    double xMin;
    double
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    double yMin;
    double yMax;
    spatialReference.GetDomain(out xMin, out xMax, out yMin, out yMax);

    double xFactor = (xMin + xMax) * 0.5; CHINAZ 
    double yFactor = (yMin + yMax) * 0.5;

    WKSPoint[] wksPoints = new WKSPoint[10];
    for (int i = 0; i < wksPoints.Length; i++) CHINAZ 
    
{ CHINAZ 
        wksPoints[i].X = xFactor + i;
        wksPoints[i].Y = yFactor + i;
    }

    IPointCollection4 pointCollection = new
        CHINAZ       


    IGeometryBridge2 geometryBridge = new GeometryEnvironmentClass();
    geometryBridge.AddWKSPoints(pointCollection, ref wksPoints);

    IPolyline polyline = pointCollection as IPolyline;
    polyline.SpatialReference =CHINAZ 

    return polyline;
}

CHINAZ

　　GeometryBag CHINAZ

　　GeometryBag是支持IGeometry接口的几何对象引用的集合，任何几何对象都可以通过IGeometryCollection接口添加到 GeometryBag中，但是在使用拓扑操作的时候，需要注意不同类型的几何类型可能会有相互不兼容的情况。在向GeometryBag中添加几何对象的时候，GeometryBag对象需要指定空间参考，添加到其中的几何对象均拥有和GeometryBag对象一样的空间参考。CHINAZ

以下为引用的内容：
private IPolygon GeometryBag_Example(IFeatureClass featureClass)
{ 
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    //Check input objects.
    if (featureClass == null)
    
{ 

         CHINAZ        

        return null;
    }

    IGeoDataset geoDataset = featureClass as IGeoDataset;
    ISpatialFilter queryFilter = new
        CHINAZ       


    //Set the properties of the spatial filter here.
    IGeometry geometryBag = new GeometryBagClass();

    //Define the spatial reference of the bag before adding geometries to it.
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    geometryBag.SpatialReference = geoDataset.SpatialReference;

    //Use a nonrecycling cursor so each returned geometry is a separate object. 
    IFeatureCursor featureCursor = featureClass.Search(queryFilter, false); 

        CHINAZ       


    IGeometryCollection geometryCollection = geometryBag as IGeometryCollection;
    IFeature currentFeature = featureCursor.NextFeature();

    while (currentFeature != null) CHINAZ 
    
{ CHINAZ 
        //Add a reference to this feature's geometry into the bag.
        //You don't specify the before or after geometry (missing),
        //so the currentFeature.Shape IGeometry is added to the end of the geometryCollection.
        object missing =CHINAZ 
        geometryCollection.AddGeometry(currentFeature.Shape, ref missing, ref missing);

        currentFeature = featureCursor.NextFeature();
    }

    //CHINAZ 
    // The spatial reference of this feature does not need to be set ahead of time. The 
    // ConstructUnion method defines the constructed polygon's spatial reference to be the same as 
    // the input geometry bag.
    ITopologicalOperator unionedPolygon = new
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    unionedPolygon.ConstructUnion(geometryBag as IEnumGeometry);

    return unionedPolygon as IPolygon;
}

CHINAZ

　　Points

CHINAZ

　　一个点包括X、Y坐标，同时可以增加M、Z值及ID属性来扩展点的功能。 CHINAZ

　　Multipoints CHINAZ

　　点的集合，多点组成Multipoint几何类型，使用multipoint对象实现了的IPointCollection接口可以访问所有的点元素，这些点同样可以拥有M、Z值及ID属性来获得更多的地理空间内涵。

CHINAZ

　　下面列举一个例子，通过一个已知的polyline来定义一个新的multipart polyline。CHINAZ

CHINAZ

以下为引用的内容：
public IPolyline ConstructMultiPartPolyline(IPolyline inputPolyline)
{ 
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    IGeometry outGeometry = new PolylineClass();

    //Always associate new, top-level geometries with an appropriate spatial reference.
    outGeometry.SpatialReference = inputPolyline.SpatialReference; 
  
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    IGeometryCollection geometryCollection = outGeometry as IGeometryCollection;

    ISegmentCollection segmentCollection = inputPolyline as ISegmentCollection;

    //Iterate over existing polyline segments using a segment enumerator.CHINAZ 
    IEnumSegment segments = segmentCollection.EnumSegments;

    ISegment currentSegment;
    int partIndex = 0;;
    int segmentIndex = 0;;   
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    segments.Next(out currentSegment,ref partIndex, ref segmentIndex);
    while(currentSegment != null)
    
{        
         CHINAZ        

        ILine normal = new LineClass();

        //Geometry methods with _Query_ in their name expect to modify existing geometries. 
        //In this case, the QueryNormal method modifies an existing line
        //segment (normal) to be the normal vector to  
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        //currentSegment at the specified location along currentSegment.
        currentSegment.QueryNormal(esriSegmentExtension.esriNoExtension, 0.5, true, currentSegment.Length / 3, normal); 
 
        //Since each normal vector is not connected to others, create a new path for each one.CHINAZ 
        ISegmentCollection newPath = new PathClass();
        object missing = Type.Missing;
        newPath.AddSegment(normal as ISegment, ref missing, refCHINAZ 
        //The spatial reference associated with geometryCollection will be assigned to all incoming paths and segments.
        geometryCollection.AddGeometry(newPath as IGeometry, ref missing, ref missing);

        segments.Next(out currentSegment,ref partIndex, refCHINAZ 
    }
    //The geometryCollection now contains the new, multipart polyline.
    return geometryCollection as IPolyline;
}

CHINAZ

　　ISegment接口的QueryNormal方法用来在弧段上的某一点生成该弧段的法线，指定其长度，这样就生成了新的segment，并且多个path添加到geometryCollection中，以IPolyline的形式返回。

CHINAZ

　　Polylines

CHINAZ

　　Polylines是有序path组成的集合，可以拥有M、Z和ID属性值。Polyline对象的IPointCollection接口包含了所有节点的复制，IGeometryCollection接口可以获取polyline的paths，ISegmentCollection接口可以获取 polyline的segments。 CHINAZ

　　Polyline结构图 CHINAZ

CHINAZ

　　Polygon是一系列rings组成的集合，可以拥有M、Z和ID属性值。每一个ring由一个或多个segment组成，Polygon或ring对象的IPointCollection接口包含了所有节点的复制，IGeometryCollection接口可以获取polygon的rings， ISegmentCollection接口可以获取polygon的segments。 CHINAZ

　　Polygon结构图

CHINAZ

　　Multipatch用于描述3D面状几何类型，由一系列的矢量三角形构成，如果其中的part是一个ring，那么它必须是封闭的，第一个节点和最后一个节点相同，另外每个part所包含节点的顺序非常重要，Inner Rings在Outer Rings之后，代表单个表面patch的一系列rings必须由第一个ring开始。

CHINAZ

　　在9.0以后的开发包中，使用IGeneralMultiPatchCreator创建新的Multipatch，IGeometryMaterial进行材质贴图。

CHINAZ

以下为引用的内容：
public IMultiPatch CreateMultipatch()
{ 
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    //Prepare the geometry material list.
    IGeometryMaterial texture = new GeometryMaterialClass();
    texture.TextureImage = "C://Temp//MyImage.bmp";
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    IGeometryMaterialList materialList = new GeometryMaterialListClass();
    materialList.AddMaterial(texture);

    //Create the multipatch.
    IGeneralMultiPatchCreator multiPatchCreator = new
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    multiPatchCreator.Init(4, 1, false, false, false, 4, materialList);

    //Set up part.

    //Could also use a Ring or a TriangleFan.
        CHINAZ       

    multiPatchCreator.SetPatchType(0, esriPatchType.esriPatchTypeTriangleStrip);
    multiPatchCreator.SetMaterialIndex(0, 0);
    multiPatchCreator.SetPatchPointIndex(0, 0);
    multiPatchCreator.SetPatchTexturePointIndex(0, 0);       
        CHINAZ       


    //Set real-world points.
    WKSPointZ upperLeft  = new WKSPointZ();
    WKSPointZ lowerLeft  = new WKSPointZ();
    WKSPointZ upperRight = new
        CHINAZ       

    WKSPointZ lowerRight = new WKSPointZ();

    upperLeft.X = 0;
    upperLeft.Y = 0;
    upperLeft.Z = 0; 
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    upperRight.X = 300;
    upperRight.Y = 0;
    upperRight.Z = 0;
    lowerLeft.X = 0;       
        CHINAZ       

    lowerLeft.Y = 0;
    lowerLeft.Z = -100;
    lowerRight.X = 300;
    lowerRight.Y = 1;       
        CHINAZ       

    lowerRight.Z = -100;

    multiPatchCreator.SetWKSPointZ(0, ref upperRight);
    multiPatchCreator.SetWKSPointZ(1, ref lowerRight);
    multiPatchCreator.SetWKSPointZ(2, refCHINAZ 
    multiPatchCreator.SetWKSPointZ(3, ref lowerLeft);

    //Set texture points.
    //Set the texture coordinates for a panel.
    WKSPoint textureUpperLeft  = new
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    WKSPoint textureLowerLeft  = new WKSPoint();
    WKSPoint textureUpperRight = new WKSPoint();
    WKSPoint textureLowerRight = new WKSPoint();

    textureUpperLeft.X = 0; CHINAZ 
    textureUpperLeft.Y = 0;
    textureUpperRight.X = 1;
    textureUpperRight.Y = 0;
    textureLowerLeft.X = 0; CHINAZ 
    textureLowerLeft.Y = 1;
    textureLowerRight.X = 1;
    textureLowerRight.Y = 1;

    multiPatchCreator.SetTextureWKSPoint(0, refCHINAZ 
    multiPatchCreator.SetTextureWKSPoint(1, ref textureLowerRight);
    multiPatchCreator.SetTextureWKSPoint(2, ref textureUpperLeft);
    multiPatchCreator.SetTextureWKSPoint(3, ref textureLowerLeft);
    IMultiPatch multiPatch = multiPatchCreator.CreateMultiPatch() asCHINAZ 

    return multiPatch;
}

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