ArcEngine實現IElement元素的編輯

目前市面上的ArcEngine教程一般只會介紹shp、geodatabase等數據的編輯操作，基本不會涉及IElement的編輯操作。舉個例子，當你在ArcMap中添加一個指北針或比例尺的時候，你可以利用鼠標動態更改它們的大小及位置，其實在ArcEngine中也可以實現類似操作，先給大家看看效果：

主界面代碼

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using ESRI.ArcGIS.Carto;
using ESRI.ArcGIS.Controls;
using ESRI.ArcGIS.DataSourcesFile;
using ESRI.ArcGIS.DataSourcesGDB;
using ESRI.ArcGIS.Display;
using ESRI.ArcGIS.esriSystem;
using ESRI.ArcGIS.Geodatabase;
using ESRI.ArcGIS.Geometry;
using ESRI.ArcGIS.Output;
using ESRI.ArcGIS.SystemUI;
using WindowsFormsApplication2.Tool;

namespace WindowsFormsApplication2
{
    public partial class MainForm : Form
    {
        public MainForm()
        {
            InitializeComponent();
        }

        // 繪製元素
        private void btnDrawElement_Click(object sender, EventArgs e)
        {
            ICommand command = new DrawElementTool();
            command.OnCreate(axMapControl1.Object);
            axMapControl1.CurrentTool = command as ITool;
        }

        // 編輯元素
        private void btnEditElement_Click(object sender, EventArgs e)
        {
            ICommand command = new EditElementTool();
            command.OnCreate(axMapControl1.Object);
            axMapControl1.CurrentTool = command as ITool;
        }
    }
}

繪製元素代碼

using System;
using System.Drawing;
using System.Runtime.InteropServices;
using ESRI.ArcGIS.ADF.BaseClasses;
using ESRI.ArcGIS.ADF.CATIDs;
using ESRI.ArcGIS.Carto;
using ESRI.ArcGIS.Controls;
using ESRI.ArcGIS.DataSourcesFile;
using ESRI.ArcGIS.DataSourcesGDB;
using ESRI.ArcGIS.Display;
using ESRI.ArcGIS.esriSystem;
using ESRI.ArcGIS.Geodatabase;
using ESRI.ArcGIS.Geometry;
using ESRI.ArcGIS.Output;
using ESRI.ArcGIS.SystemUI;
using System.Windows.Forms;

namespace WindowsFormsApplication2.Tool
{
    /// <summary>
    /// Summary description for DrawElementTool.
    /// </summary>
    [Guid("2b53c3d5-fe61-41cd-985e-4b4d7676980e")]
    [ClassInterface(ClassInterfaceType.None)]
    [ProgId("WindowsFormsApplication2.Tool.DrawElementTool")]
    public sealed class DrawElementTool : BaseTool
    {
        #region COM Registration Function(s)
        [ComRegisterFunction()]
        [ComVisible(false)]
        static void RegisterFunction(Type registerType)
        {
            // Required for ArcGIS Component Category Registrar support
            ArcGISCategoryRegistration(registerType);

            //
            // TODO: Add any COM registration code here
            //
        }

        [ComUnregisterFunction()]
        [ComVisible(false)]
        static void UnregisterFunction(Type registerType)
        {
            // Required for ArcGIS Component Category Registrar support
            ArcGISCategoryUnregistration(registerType);

            //
            // TODO: Add any COM unregistration code here
            //
        }

        #region ArcGIS Component Category Registrar generated code
        /// <summary>
        /// Required method for ArcGIS Component Category registration -
        /// Do not modify the contents of this method with the code editor.
        /// </summary>
        private static void ArcGISCategoryRegistration(Type registerType)
        {
            string regKey = string.Format("HKEY_CLASSES_ROOT\\CLSID\\{{{0}}}", registerType.GUID);
            ControlsCommands.Register(regKey);

        }
        /// <summary>
        /// Required method for ArcGIS Component Category unregistration -
        /// Do not modify the contents of this method with the code editor.
        /// </summary>
        private static void ArcGISCategoryUnregistration(Type registerType)
        {
            string regKey = string.Format("HKEY_CLASSES_ROOT\\CLSID\\{{{0}}}", registerType.GUID);
            ControlsCommands.Unregister(regKey);

        }

        #endregion
        #endregion

        private IHookHelper m_hookHelper;

        public DrawElementTool()
        {
            //
            // TODO: Define values for the public properties
            //
            base.m_category = ""; //localizable text 
            base.m_caption = "";  //localizable text 
            base.m_message = "";  //localizable text
            base.m_toolTip = "";  //localizable text
            base.m_name = "";   //unique id, non-localizable (e.g. "MyCategory_MyTool")
            try
            {
                //
                // TODO: change resource name if necessary
                //
                string bitmapResourceName = GetType().Name + ".bmp";
                base.m_bitmap = new Bitmap(GetType(), bitmapResourceName);
                base.m_cursor = new System.Windows.Forms.Cursor(GetType(), GetType().Name + ".cur");
            }
            catch (Exception ex)
            {
                System.Diagnostics.Trace.WriteLine(ex.Message, "Invalid Bitmap");
            }
        }

        #region Overridden Class Methods

        /// <summary>
        /// Occurs when this tool is created
        /// </summary>
        /// <param name="hook">Instance of the application</param>
        public override void OnCreate(object hook)
        {
            if (m_hookHelper == null)
                m_hookHelper = new HookHelperClass();

            m_hookHelper.Hook = hook;

            // TODO:  Add DrawElementTool.OnCreate implementation
        }

        /// <summary>
        /// Occurs when this tool is clicked
        /// </summary>
        public override void OnClick()
        {
            // TODO: Add DrawElementTool.OnClick implementation
        }

        public override void OnMouseDown(int Button, int Shift, int X, int Y)
        {
            IMapControlDefault m_mapControl = m_hookHelper.Hook as IMapControlDefault;
            IGeometry pGeometry = m_mapControl.TrackPolygon();

            // 創建顏色
            IRgbColor pRgbColor = new RgbColor();
            pRgbColor.Red = 255;
            pRgbColor.Green = 0;
            pRgbColor.Blue = 0;

            // 創建符號
            ISimpleFillSymbol pSimpleFillSymbol = new SimpleFillSymbol();
            pSimpleFillSymbol.Color = pRgbColor;
            pSimpleFillSymbol.Style = esriSimpleFillStyle.esriSFSCross;

            // 創建元素
            IFillShapeElement pFillShapeElement = new PolygonElement() as IFillShapeElement;
            pFillShapeElement.Symbol = pSimpleFillSymbol;
            IElement pElement = pFillShapeElement as IElement;
            pElement.Geometry = pGeometry;

            // 繪製元素
            IActiveView pActiveView = m_mapControl.ActiveView;
            IGraphicsContainer pGraphicsContainer = pActiveView.GraphicsContainer;
            pGraphicsContainer.DeleteAllElements();
            pGraphicsContainer.AddElement(pElement, 0);
            pActiveView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, null, null);

            // 選中該元素
            IGraphicsContainerSelect pGraphicsContainerSelect = pGraphicsContainer as IGraphicsContainerSelect;
            pGraphicsContainerSelect.SelectElement(pElement);
            pActiveView.PartialRefresh(esriViewDrawPhase.esriViewGraphicSelection, null, null);
        }

        public override void OnMouseMove(int Button, int Shift, int X, int Y)
        {
            // TODO:  Add DrawElementTool.OnMouseMove implementation
        }

        public override void OnMouseUp(int Button, int Shift, int X, int Y)
        {
            // TODO:  Add DrawElementTool.OnMouseUp implementation
        }
        #endregion
    }
}

編輯元素代碼

using System;
using System.Drawing;
using System.Runtime.InteropServices;
using ESRI.ArcGIS.ADF.BaseClasses;
using ESRI.ArcGIS.ADF.CATIDs;
using ESRI.ArcGIS.Carto;
using ESRI.ArcGIS.Controls;
using ESRI.ArcGIS.DataSourcesFile;
using ESRI.ArcGIS.DataSourcesGDB;
using ESRI.ArcGIS.Display;
using ESRI.ArcGIS.esriSystem;
using ESRI.ArcGIS.Geodatabase;
using ESRI.ArcGIS.Geometry;
using ESRI.ArcGIS.Output;
using ESRI.ArcGIS.SystemUI;
using System.Windows.Forms;

namespace WindowsFormsApplication2.Tool
{
    /// <summary>
    /// Summary description for EditElementTool.
    /// </summary>
    [Guid("e3405301-33a6-4a07-95d6-6479ef1cefde")]
    [ClassInterface(ClassInterfaceType.None)]
    [ProgId("WindowsFormsApplication2.Tool.EditElementTool")]
    public sealed class EditElementTool : BaseTool
    {
        #region COM Registration Function(s)
        [ComRegisterFunction()]
        [ComVisible(false)]
        static void RegisterFunction(Type registerType)
        {
            // Required for ArcGIS Component Category Registrar support
            ArcGISCategoryRegistration(registerType);

            //
            // TODO: Add any COM registration code here
            //
        }

        [ComUnregisterFunction()]
        [ComVisible(false)]
        static void UnregisterFunction(Type registerType)
        {
            // Required for ArcGIS Component Category Registrar support
            ArcGISCategoryUnregistration(registerType);

            //
            // TODO: Add any COM unregistration code here
            //
        }

        #region ArcGIS Component Category Registrar generated code
        /// <summary>
        /// Required method for ArcGIS Component Category registration -
        /// Do not modify the contents of this method with the code editor.
        /// </summary>
        private static void ArcGISCategoryRegistration(Type registerType)
        {
            string regKey = string.Format("HKEY_CLASSES_ROOT\\CLSID\\{{{0}}}", registerType.GUID);
            ControlsCommands.Register(regKey);

        }
        /// <summary>
        /// Required method for ArcGIS Component Category unregistration -
        /// Do not modify the contents of this method with the code editor.
        /// </summary>
        private static void ArcGISCategoryUnregistration(Type registerType)
        {
            string regKey = string.Format("HKEY_CLASSES_ROOT\\CLSID\\{{{0}}}", registerType.GUID);
            ControlsCommands.Unregister(regKey);

        }

        #endregion
        #endregion

        private IHookHelper m_hookHelper;
        private IElement pElement;
        private ISelectionTracker pSelectionTracker;

        public EditElementTool()
        {
            //
            // TODO: Define values for the public properties
            //
            base.m_category = ""; //localizable text 
            base.m_caption = "";  //localizable text 
            base.m_message = "";  //localizable text
            base.m_toolTip = "";  //localizable text
            base.m_name = "";   //unique id, non-localizable (e.g. "MyCategory_MyTool")
            try
            {
                //
                // TODO: change resource name if necessary
                //
                string bitmapResourceName = GetType().Name + ".bmp";
                base.m_bitmap = new Bitmap(GetType(), bitmapResourceName);
                base.m_cursor = new System.Windows.Forms.Cursor(GetType(), GetType().Name + ".cur");
            }
            catch (Exception ex)
            {
                System.Diagnostics.Trace.WriteLine(ex.Message, "Invalid Bitmap");
            }
        }

        #region Overridden Class Methods

        /// <summary>
        /// Occurs when this tool is created
        /// </summary>
        /// <param name="hook">Instance of the application</param>
        public override void OnCreate(object hook)
        {
            if (m_hookHelper == null)
                m_hookHelper = new HookHelperClass();

            m_hookHelper.Hook = hook;
        }

        /// <summary>
        /// Occurs when this tool is clicked
        /// </summary>
        public override void OnClick()
        {
            // TODO: Add EditElementTool.OnClick implementation
        }

        public override void OnMouseDown(int Button, int Shift, int X, int Y)
        {
            IGraphicsContainer pGraphicsContainer = m_hookHelper.ActiveView.GraphicsContainer;
            IGraphicsContainerSelect pGraphicsContainerSelect = pGraphicsContainer as IGraphicsContainerSelect;

            // 判斷是否有元素被選中
            IEnumElement pEnumElement = pGraphicsContainerSelect.SelectedElements;
            pEnumElement.Reset();
            pElement = pEnumElement.Next();
            if (pElement == null)
            {
                MessageBox.Show("當前沒有被選中的元素");
                return;
            }

            // 初始化ISelectionTracker
            IElementEditVertices pElementEditVertices = pElement as IElementEditVertices;
            pElementEditVertices.MovingVertices = true;
            pSelectionTracker = pElementEditVertices.GetMoveVerticesSelectionTracker();
            pSelectionTracker.Display = m_hookHelper.ActiveView.ScreenDisplay;
            pSelectionTracker.Draw(m_hookHelper.ActiveView.ScreenDisplay, 0, esriTrackerStyle.esriTrackerActive);
            pSelectionTracker.OnMouseDown(Button, Shift, X, Y);
        }

        public override void OnMouseMove(int Button, int Shift, int X, int Y)
        {
            if (pSelectionTracker != null)
            {
                pSelectionTracker.OnMouseMove(Button, Shift, X, Y);
            }
        }

        public override void OnMouseUp(int Button, int Shift, int X, int Y)
        {
            if (pSelectionTracker != null)
            {
                pSelectionTracker.OnMouseUp(Button, Shift, X, Y);
                pElement.Geometry = pSelectionTracker.Geometry;
                m_hookHelper.ActiveView.GraphicsContainer.UpdateElement(pElement);
                m_hookHelper.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, null, null);
                m_hookHelper.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGraphicSelection, null, null);
            }
        }
        #endregion
    }
}