空间查询

于 2013-03-13 22:19:47 发布
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分类专栏： AE开发 C#

（四）点空间查询

IFeatureLayer pFeatureLayer = this.axMapControl1.get_Layer(1) as IFeatureLayer;

            IFeatureClass pFeatureClass = pFeatureLayer.FeatureClass;

            IPoint pPoint = new PointClass ();

            pPoint.PutCoords(83.140965992759618, 49.669371563063862);//pPoint的坐标

 

            ISpatialFilter pSpatialFilter = new SpatialFilterClass();

            pSpatialFilter.Geometry = pPoint;//原图形

            pSpatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelIntersects;//查询条件intersect

 

            IFeatureCursor pFeatureCursor = pFeatureClass.Search(pSpatialFilter ,false );//将查询结果赋给指针

            IFeature pFeature = pFeatureCursor.NextFeature();//指针后移所指向的要素，赋给pFeature

 

            while (pFeature != null)

            {

                this.axMapControl1.FlashShape(pFeature .Shape ,3,300,null );

                pFeature = pFeatureCursor.NextFeature();

            }

 

（五）面空间查询

//查询与一个面intersect的点有哪些

 

            listView1.Items.Clear();

            listView1.Columns.Clear();

 

            IFeatureLayer pFeatureLayer = this.axMapControl1.get_Layer(0) as IFeatureLayer;//Layer0是点图层，1是面图层

            IFeatureClass pFeatureClass = pFeatureLayer.FeatureClass;

 

            // 获取字段名

            int iFieldCount = pFeatureClass.Fields.FieldCount;

            for (int i = 0; i < iFieldCount; i++)

            {

                string strFieldName = pFeatureClass.Fields.get_Field(i).Name;

                listView1.Columns.Add(strFieldName);

            }

 

            IEnvelope  pEnv = new EnvelopeClass ();

            pEnv.PutCoords(83.140965992759618 - 10, 49.669371563063862 - 10, 83.140965992759618 + 10, 49.669371563063862 + 10);

            //pPoint.PutCoords(83.140965992759618,49.669371563063862);pPoint的坐标

 

            ISpatialFilter pSpatialFilter = new SpatialFilterClass();

            pSpatialFilter.Geometry = pEnv ;//原图形

            pSpatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelIntersects;//查询条件intersect

 

            IFeatureCursor pFeatureCursor = pFeatureClass.Search(pSpatialFilter, false);//将查询结果赋给指针

            IFeature pFeature = pFeatureCursor.NextFeature();//指针后移所指向的要素，赋给pFeature

 

            while (pFeature != null)

            {

                ListViewItem pListViewItem = new ListViewItem();

                pListViewItem.Text = pFeature.get_Value(0).ToString();

 

                //添加字段值

                for (int i = 1; i < iFieldCount; i++)

                {

                    //添加字段值

                    string strFieldValue = pFeature.get_Value(i).ToString();

                    ListViewItem.ListViewSubItem pListViewSbuItem = new ListViewItem.ListViewSubItem();

                    pListViewSbuItem.Text = strFieldValue;

                    pListViewItem.SubItems.Add(pListViewSbuItem);

                }

 

                listView1.Items.Add(pListViewItem);

 

               

 

                this.axMapControl1.FlashShape(pFeature.Shape, 3, 300, null);

                pFeature = pFeatureCursor.NextFeature();

 

               

            }

 

 

（六）点空间查询和面空间查询

private bool boolPointQuery = false ;

        private bool boolEnvQuery = false;

 

        private void btnSpatialQuery_Click(object sender, EventArgs e)

        {

            this.boolEnvQuery = true;

            this.boolPointQuery = false;

            listView1.Items.Clear();

            listView1.Columns.Clear();

        }

 

private void btnPointSpatial_Click(object sender, EventArgs e)

        {

            this.boolPointQuery = true;

            this.boolEnvQuery = false;

 

            listView1.Items.Clear();

            listView1.Columns.Clear();          

        }

 

        private void axMapControl1_OnMouseDown(object sender, ESRI.ArcGIS.Controls.IMapControlEvents2_OnMouseDownEvent e)

        {

 

            listView1.Items.Clear();

            listView1.Columns.Clear();

 

            //点空间查询，单个图层

            if (this.boolPointQuery == true)

            {

                IFeatureLayer pFeatureLayer = this.axMapControl1.get_Layer(1) as IFeatureLayer;

                IFeatureClass pFeatureClass = pFeatureLayer.FeatureClass;

 

                //Create a point to use for the search;

                ESRI.ArcGIS.Geometry.IPoint pPoint = new ESRI.ArcGIS.Geometry.PointClass();

                pPoint.PutCoords(e.mapX, e.mapY);//49.669371563063862);

                //pPoint.PutCoords(83.140965992759618, 55.4932623480468);//49.669371563063862);

 

                //Getting a reference;

                ISpatialFilter pPpatialFilter = new SpatialFilterClass();

 

                //Setting the Geometry,GeometryField and SpatialRel parameters;           

                pPpatialFilter.Geometry = pPoint;

                pPpatialFilter.GeometryField = pFeatureClass.ShapeFieldName;

                pPpatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelIntersects   ;//.esriSpatialRelWithin ;//.esriSpatialRelIntersects;//.esriSpatialRelWithin ;//.esriSpatialRelIntersects;           

 

                // 获取字段名

                int iFieldCount = pFeatureClass.Fields.FieldCount;

                for (int i = 0; i < iFieldCount; i++)

                {

                    string strFieldName = pFeatureClass.Fields.get_Field(i).Name;

                    listView1.Columns.Add(strFieldName);

                }

                //添加要素

                try

                {

                    //Execute the spatiafilter;

                    IFeatureCursor pFeatureCursor = pFeatureClass.Search(pPpatialFilter, false);

                    IFeature pFeature = pFeatureCursor.NextFeature();

 

                    while (pFeature != null)

                    {

                        ListViewItem pListViewItem = new ListViewItem();

                        pListViewItem.Text = pFeature.get_Value(0).ToString();

 

                        //添加字段值

                        for (int i = 1; i < iFieldCount; i++)

                        {

                            //添加字段值

                            string strFieldValue = pFeature.get_Value(i).ToString();

                            ListViewItem.ListViewSubItem pListViewSbuItem = new ListViewItem.ListViewSubItem();

                            pListViewSbuItem.Text = strFieldValue;

                            pListViewItem.SubItems.Add(pListViewSbuItem);

                        }

 

                        listView1.Items.Add(pListViewItem);

                        //闪烁查询到的要素

                        this.axMapControl1.FlashShape(pFeature.Shape, 2, 300, Type.Missing);

                        //下一个要素

                        pFeature = pFeatureCursor.NextFeature();

                    }

                }

                catch (Exception ax)

                {

                    MessageBox.Show(ax.ToString());

                }

            }

 

            //多边形空间查询，多个图层

            if (this.boolEnvQuery == true)

            {//用于查询的矩形（相当于点的缓冲区，这样比生成缓冲区节省资源），

                //envelope的大小根据实际情况设定，以方便使用为准

                IEnvelope pEnv = new EnvelopeClass();

                pEnv.PutCoords(e.mapX - 2, e.mapY - 2, e.mapX + 2, e.mapY + 2);

                IGeometry pGeometry = pEnv as IGeometry;

                ISpatialFilter pSpatialFilter = new SpatialFilterClass();

                pSpatialFilter.Geometry = pGeometry;

                pSpatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelIntersects;//.esriSpatialRelContains;

 

                //没有必要将地图上的高亮选择清除，因为下面对每个图层的选择都用esriSelectionResultNew，会自动清除上次的高亮显示，

                //而不同图层之间的高亮选择不会有任何影响，因为IFeatureSelection接口的一切属性和方法都是针对一个图层

                //                this.axMapControl1.Map.ClearSelection();

 

                IFeatureLayer pFeatureLayer;

                IFeatureSelection pFeatureSelection;

                ISelectionSet pSelectionSet;

                IEnumIDs pEnumIDs;

                IFeature pFeature;

 

                pFeatureLayer = this.axMapControl1.get_Layer(0) as IFeatureLayer;

                IFeatureClass pFeatureClass = pFeatureLayer.FeatureClass;

 

                // 获取字段名到ListView中

                int iFieldCount = pFeatureClass.Fields.FieldCount;

                for (int i = 0; i < iFieldCount; i++)

                {

                    string strFieldName = pFeatureClass.Fields.get_Field(i).Name;

                    listView1.Columns.Add(strFieldName);

                }

                try

                {

                    //循环显示所有图层上选中的要素

                    for (int i = 0; i < this.axMapControl1.LayerCount; i++)

                    {

                        pFeatureLayer = this.axMapControl1.get_Layer(i) as IFeatureLayer;

                        if (pFeatureLayer.Visible && pFeatureLayer.Selectable)

                        {

                            pFeatureSelection = pFeatureLayer as IFeatureSelection;

                            //选择之前先清除，这是个好习惯（除非是用Add方式）

                            pFeatureSelection.Clear();

                            pFeatureSelection.SelectFeatures(pSpatialFilter,esriSelectionResultEnum.esriSelectionResultNew, true);

                            pSelectionSet = pFeatureSelection.SelectionSet;

                            //如果选择集内有Feature

                            if (pSelectionSet.Count > 0)

                            {

                                //通过pEnumIDs获得该SelectionSet中的Feature的id值，再用FeatureClass.GetFeature（）方法获得该Feature对象

                                //这里为了学习新接口而使用了IEnumIDs，为了获得SelectionSet中的Feature，可以使用其Search（）方法

                                //获得ICursor，再使用循环获得Feature，如下注释选定行

                                //                            pSelectionSet.Search(null,false,out pCursor);

                                //                            pRow = pCursor.NextRow();

                                //                            if(pRow!=null)

                                //                            {

                                //                            }

                                pEnumIDs = pSelectionSet.IDs;

                                long id = pEnumIDs.Next();

                                while (id != -1)

                                {

                                    pFeature = pFeatureLayer.FeatureClass.GetFeature((int)id);

 

                                    ListViewItem pListViewItem = new ListViewItem();

                                    pListViewItem.Text = pFeature.get_Value(0).ToString();

                                    for (int j = 1; j < pFeature.Fields.FieldCount; j++)

                                    {

                                        //添加字段值

                                        string strFieldValue = pFeature.get_Value(j).ToString();

                                        ListViewItem.ListViewSubItem pListViewSbuItem = newListViewItem.ListViewSubItem();

                                        pListViewSbuItem.Text = strFieldValue;

                                        pListViewItem.SubItems.Add(pListViewSbuItem);

                                    }

                                    listView1.Items.Add(pListViewItem);

                                    this.axMapControl1.FlashShape(pFeature.Shape, 2, 300, Type.Missing);

                                    //MessageBox.Show("选中的Feature ID为：" + id.ToString());

                                    id = pEnumIDs.Next();

                                }

                                pFeatureSelection.Clear();

                                //MessageBox.Show("选中的Feature ID为：" + id.ToString());

                            }

                        }

                    }

                }

                catch (Exception ax)

                {

                    MessageBox.Show(ax.ToString());

                }

            }

           

        }

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