C#ArcEngine二次开发如何实现Arcmap中编辑器里面的部分功能

Question

C#ArcEngine二次开发如何实现Arcmap中编辑器里面的部分功能
增加、删除面等功能已经实现，我需要类似Arcmap中的“整形要素工具”来协助我修改面要素
感谢

Answer 1

以下内容部分参考ChatGPT模型：
首先，要实现类似ArcMap中的“整形要素工具”，您需要使用ArcObjects的编辑器对象来实现。具体来说，您需要创建一个新的编辑工具类，该类将继承自ESRI.ArcGIS.Desktop.AddIns.Tool类，并实现IEditTask接口。

在您的编辑工具类中，您需要实现OnMouseDown和OnMouseMove事件处理程序以捕获鼠标单击和移动事件。然后，您可以使用IEditor对象来获取当前编辑会话中的活动编辑图层，并使用IEditTask接口中的EditSketch对象来获取当前正在编辑的要素的几何图形。

接下来，您可以使用IEditTask接口提供的一些方法和属性来执行您的编辑操作。例如，您可以使用EditSketch对象中的AddVertex方法向当前正在编辑的要素添加新的顶点，使用MovePoint方法移动现有顶点，使用Cut方法将要素分割为两个要素等等。

最后，您需要在您的编辑工具类中实现OnDoubleClick事件处理程序以完成编辑操作，并将编辑结果保存到编辑会话中。

以下是一个简单的示例，演示如何使用编辑器对象实现“整形要素工具”：

using ESRI.ArcGIS.ArcMapUI;
using ESRI.ArcGIS.Carto;
using ESRI.ArcGIS.Editor;
using ESRI.ArcGIS.Geometry;
using ESRI.ArcGIS.Desktop.AddIns;

namespace EditTools
{
    public class ReshapeTool : Tool, IEditTask
    {
        private IEditor m_editor;
        private IEditSketch m_editSketch;
        private IFeature m_editFeature;

        public ReshapeTool()
        {
            m_editor = ArcMap.Editor;
        }

        protected override void OnMouseDown(MouseEventArgs arg)
        {
            // Get the active edit layer
            IFeatureLayer editLayer = m_editor.EditLayer as IFeatureLayer;

            if (editLayer == null)
                return;

            // Get the clicked point in map coordinates
            IPoint clickedPoint = ArcMap.Document.ActiveView.ScreenDisplay.DisplayTransformation.ToMapPoint(arg.X, arg.Y);

            // Get the nearest feature to the clicked point
            m_editFeature = GetNearestFeature(editLayer, clickedPoint);

            if (m_editFeature == null)
                return;

            // Start editing the feature
            m_editor.StartOperation();

            // Get the edit sketch for the feature
            m_editSketch = m_editor as IEditSketch;
            m_editSketch.Geometry = m_editFeature.ShapeCopy;
            m_editSketch.RefreshSketch();

            // Capture mouse move events to reshape the feature
            this.Cursor = Cursors.Cross;
            this.Enabled = true;
        }

        protected override void OnMouseMove(MouseEventArgs arg)
        {
            if (m_editSketch == null)
                return;

            // Get the current mouse position in map coordinates
            IPoint currentPoint = ArcMap.Document.ActiveView.ScreenDisplay.DisplayTransformation.ToMapPoint(arg.X, arg.Y);

            // Reshape the feature based on the current mouse position
            m_editSketch.MovePoint(m_editSketch.PointCount - 1, currentPoint);
            m_editSketch.RefreshSketch();
        }

        protected override void OnDoubleClick()
        {
            if (m_editSketch == null)
                return;

            // Finish editing the feature
            m_editor.StopOperation("Reshape Feature");
            m_editor.Map.SelectFeature(m_editor.EditLayer, m_editFeature);

            // Clear the edit sketch
            m_editSketch.Geometry = null;
            m_editSketch.RefreshSketch();

            // Reset the cursor and tool state
            this.Cursor = Cursors.Default;
            this.Enabled = false;
        }

        #region IEditTask Members

        public void Activate()
        {
            // Nothing to do
        }

        public void Deactivate()
        {
            // Nothing to do
        }

        public void Delete()
        {
            // Nothing to do
        }

        public void FinishSketch()
        {
            // Nothing to do
        }

        public void RefreshSketch()
        {
            // Nothing to do
        }

        public void StartSketch(IGeometry geometry)
        {
            // Nothing to do
        }

        public void UpdateSketch(IGeometry geometry)
        {
            // Nothing to do
        }

        #endregion

        private IFeature GetNearestFeature(IFeatureLayer layer, IPoint point)
        {
            // Get a search envelope around the clicked point
            IEnvelope searchEnvelope = point.Envelope;
            searchEnvelope.Expand(0.1, 0.1, false);

            // Create a spatial filter to search for features within the search envelope
            ISpatialFilter spatialFilter = new SpatialFilterClass();
            spatialFilter.Geometry = searchEnvelope;
            spatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelIntersects;

            // Search for features within the search envelope
            IFeatureCursor featureCursor = layer.Search(spatialFilter, false);
            IFeature feature = featureCursor.NextFeature();

            // Get the nearest feature to the clicked point
            double minDistance = double.MaxValue;
            IFeature nearestFeature = null;

            while (feature != null)
            {
                double distance = point.DistanceTo(feature.ShapeCopy as IPoint);

                if (distance < minDistance)
                {
                    minDistance = distance;
                    nearestFeature = feature;
                }

                feature = featureCursor.NextFeature();
            }

            return nearestFeature;
        }
    }
}

在这个示例中，我们创建了一个名为“ReshapeTool”的编辑工具类，它允许用户在单击要素时捕获要素，并在鼠标移动时重新形状要素。要实现这个功能，我们使用了IEditor、IEditTask和IEditSketch等编辑器对象，以及一些编辑操作，如AddVertex、MovePoint和Cut等。我们还使用了GetNearestFeature方法来查找最接近鼠标单击点的要素。

注意，这只是一个简单的示例，您可能需要根据您的具体需求进行一些修改和定制。但是，这个示例应该可以帮助您了解如何使用ArcObjects编辑器对象来实现类似ArcMap中的“整形要素工具”。
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