ArcGIS Engine 编辑- ITask

下面的代码是我们定制的一个工作流-给等高线赋值

namespace EngineApplication

{

    [Guid("5b0c0692-eaf7-4d64-9cee-c8c1afaf06f4")]

    [ClassInterface(ClassInterfaceType.None)]

    [ProgId("EditeTest.ContourTask")]

    public class CalculateContour : ESRI.ArcGIS.Editor.IEditTask

    {

         #region

        IEditor pEngineEditor;

        IEditSketch pEditSketch;

        IEditLayers pEditLayer;

        #endregion

        #region "IEditTask Implementations"

        public void Activate(IEditor pEditor, ESRI.ArcGIS.Editor.IEditTask pEditTask)

        {

            if (pEditor == null)

                return;

            pEngineEditor = pEditor;

            pEditSketch = pEngineEditor as IEditSketch;

            pEditSketch.GeometryType = esriGeometryType.esriGeometryPolyline;

            pEditLayer = pEditSketch as IEditLayers;

            //Listen to engine editor events

            ((IEngineEditEvents_Event)pEditSketch).OnTargetLayerChanged += new IEngineEditEvents_OnTargetLayerChangedEventHandler(OnTargetLayerChanged);

            ((IEngineEditEvents_Event)pEditSketch).OnCurrentTaskChanged += new IEngineEditEvents_OnCurrentTaskChangedEventHandler(OnCurrentTaskChanged);

        }

        public void Deactivate()

            // TODO: Add ArcGISClass1.Deactivate implementation

            pEditSketch.RefreshSketch();

            //Stop listening to engine editor events.

            ((IEngineEditEvents_Event)pEditSketch).OnTargetLayerChanged -= OnTargetLayerChanged;

            ((IEngineEditEvents_Event)pEditSketch).OnCurrentTaskChanged -= OnCurrentTaskChanged;

            //Release object references.

            pEngineEditor = null;

            pEditSketch = null;

            pEditLayer = null;

        public string Name

            get

            {

                // TODO: Add ArcGISClass1.Name getter implementation

                return "ContourTask";

            }

        public string UniqueName

        public string GroupName

                //This property allows groups to be created/used in the EngineEditTaskToolControl treeview.

                //If an empty string is supplied the task will be appear in an "Other Tasks" group.

                //In this example the Reshape Polyline_CSharp task will appear in the existing Modify Tasks group.

                return "Other Tasks";

        public void OnDeleteSketch()

            // TODO: Add ArcGISClass1.OnDeleteSketch implementation

        public void OnFinishSketch()

            // TODO: Add ArcGISClass1.OnFinishSketch implementation

            //get reference to featurelayer being edited

            IFeatureLayer pFeatureLayer = pEditLayer.CurrentLayer as IFeatureLayer;

            //get reference to the sketch geometry

            IGeometry pPolyline = pEditSketch.Geometry;

            if (pPolyline.IsEmpty == false)

                ParaSetting pFormSetting = new ParaSetting(pFeatureLayer.FeatureClass);

                pFormSetting.ShowDialog();

                if (pFormSetting.DialogResult == DialogResult.OK)

                {

                    pHeightName = pFormSetting.pFieldNames.Text;

                    pHeight = Convert.ToDouble(pFormSetting.dHeight.Text);

                    pInterval = Convert.ToDouble(pFormSetting.dInterval.Text);

                    pFormSetting.Dispose();

                    pFormSetting = null;

                    IFeatureCursor pFeatureCursor = GetFeatureCursor(pPolyline, pFeatureLayer.FeatureClass);

                    CalculateIntersect(pFeatureCursor, pPolyline);

                    MessageBox.Show("OK");

                }

            //refresh the display

            IActiveView pActiveView = pEngineEditor.Map as IActiveView;

            pActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeography, (object)pFeatureLayer, pActiveView.Extent);

        private IFeatureCursor GetFeatureCursor(IGeometry pGeometry, IFeatureClass pFeatureClass)

            //空间过虑器的创建

            ISpatialFilter pSpatialFilter = new SpatialFilter();

            pSpatialFilter.Geometry = pGeometry;

            //空间过虑器几何体实体

            //空间过虑器参照系

            //空间过虑器空间数据字段名

            pSpatialFilter.GeometryField = pFeatureClass.ShapeFieldName;

            //空间过虑器空间关系类型

            pSpatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelIntersects;

            //相交

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

            return pFeatureCursor;

        //起始等高线值

        private double pHeight;

        //等高线间距

        private double pInterval;

        //高程字段名

        private string pHeightName;

        private void CalculateIntersect(IFeatureCursor pFeatureCursor, IGeometry Geometry)

            //要素游标

            IMultipoint pIntersectionPoints = null;

            //多点

            IPointCollection pPointColl = null;

            List<IFeature> pFeatureList = new List<IFeature>();

            //和直线相交的要素集合，未排序

            double[,] pIndex = null;

            //距离和初始索引

            if (pFeatureCursor == null)

            ITopologicalOperator pTopoOperator = Geometry as ITopologicalOperator;

            IPointCollection pSketchPointColl = Geometry as IPointCollection;

            //所画直线的起点

            IPoint P0 = pSketchPointColl.get_Point(0);

            IFeature pFeature = pFeatureCursor.NextFeature();

            double HValue = 0;

            int FldIndex = 0;

            pFeatureList.Clear();

            while ((pFeature != null))

                //和直线相交的要素集合

                pFeatureList.Add(pFeature);

                //

                pFeature = pFeatureCursor.NextFeature();

            //此时pFeatureL中的等值线并不是按顺序（空间）排列，需要排序

            //求出各交点到直线起点距离

            int pCount = pFeatureList.Count;

            pIndex = new double[2, pCount];

            for (int i = 0; i <= pCount - 1; i++)

                try

                    pFeature = pFeatureList[i];

                    //求交点:

                    pIntersectionPoints = pTopoOperator.Intersect(pFeature.Shape, esriGeometryDimension.esriGeometry0Dimension) as IMultipoint;

                    pPointColl = pIntersectionPoints as IPointCollection;

                    //QI

                    //原来序号

                    pIndex[0, i] = i;

                    //距离

                    pIndex[1, i] = GetDistace(P0, pPointColl.get_Point(0));

                    //下个要素

                    pFeature = pFeatureCursor.NextFeature();

                catch (Exception e)

                    MessageBox.Show(e.ToString());

            //排序:将和直线相交的等直线按与起点的距离排序，冒泡法

                for (int j = i + 1; j <= pCount - 1; j++)

                    if (pIndex[1, j] < pIndex[1, i])

                    {

                        double pTempindex = pIndex[0, i];

                        pIndex[0, i] = pIndex[0, j];

                        pIndex[0, j] = pTempindex;

                        //交换索引

                        double pTemp = pIndex[1, i];

                        pIndex[1, i] = pIndex[1, j];

                        pIndex[1, j] = pTemp;

                        //交换距离

                    }

            //开始高程赋值

            HValue = pHeight;

            try

                for (int i = 0; i <= pCount - 1; i++)

                    //获取高程字段的索引

                    FldIndex = pFeature.Fields.FindField(pHeightName);

                    //高程赋值

                    pFeature.set_Value(FldIndex, HValue as object);

                    //要素更新

                    pFeature.Store();

                    //Get the next feature and next H

                    HValue = HValue + pInterval;

            catch (Exception e)

                MessageBox.Show(e.ToString());

        /// <summary>

        /// 获取我们画的线和等高线之间的距离

        /// </summary>

        /// <param name="pPoint1"></param>

        /// <param name="pPoint2"></param>

        /// <returns></returns>

        private double GetDistace(IPoint pPoint1, IPoint pPoint2)

            return (pPoint1.X - pPoint2.X) * (pPoint1.X - pPoint2.X) + (pPoint1.Y - pPoint2.Y) * (pPoint1.Y - pPoint2.Y);

        public void OnTargetLayerChanged()

            PerformSketchToolEnabledChecks();

        void OnCurrentTaskChanged()

            if (pEngineEditor.CurrentTask.Name == "CalculateContourTask")

                PerformSketchToolEnabledChecks();

        private void PerformSketchToolEnabledChecks()

            if (pEditLayer == null)

            //Only enable the sketch tool if there is a polyline target layer.

            if (pEditLayer.CurrentLayer.FeatureClass.ShapeType != esriGeometryType.esriGeometryPolyline)

                pEditSketch.GeometryType = esriGeometryType.esriGeometryNull;

    }

}

效果如下：

task2

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    本文转自wenglabs博客园博客，原文链接：http://www.cnblogs.com/arxive/p/6262948.html，如需转载请自行联系原作者