利用INewLineFeedback画线

主要修改的地方为在绘制过程中或绘制结束后实现了结点的符号化,效果如图:

 

using System;
using System.Drawing;
using System.Runtime.InteropServices;
using ESRI.ArcGIS.ADF.BaseClasses;
using ESRI.ArcGIS.ADF.CATIDs;
using ESRI.ArcGIS.Controls;
using System.Windows.Forms;
using ESRI.ArcGIS.Display;
using ESRI.ArcGIS.Geometry;
using ESRI.ArcGIS.Carto;

namespace CHD.GIS.myCommands
{
    public sealed class myAddPolyLine : BaseTool
    {
        private IHookHelper m_hookHelper;
        private INewLineFeedback m_LineFeedback;
        public myAddPolyLine()
        {
            //
            // TODO: Define values for the public properties
            //
            base.m_category = ""; //localizable text 
            base.m_caption = "添加线";  //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");
            }
        }

        Overriden Class Methods#region Overriden 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 myAddLine.OnCreate implementation
        }

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

        public override void OnMouseDown(int Button, int Shift, int X, int Y)
        {
            if (Button == 2) //右键
                return;
            // TODO:  Add myAddLine.OnMouseDown implementation
           IPoint pt = m_hookHelper.ActiveView.ScreenDisplay.DisplayTransformation.ToMapPoint(X, Y);
            if (m_LineFeedback == null)
            {
                m_LineFeedback = new NewLineFeedbackClass();
                m_LineFeedback.Display = m_hookHelper.ActiveView.ScreenDisplay;
                m_LineFeedback.Start(pt);
                
            }
            else
            {
                m_LineFeedback.AddPoint(pt);
            }

            绘制结点的第一种方法,在绘制过程中添加结点符号,效果类似于画线编辑时的效果#region 绘制结点的第一种方法,在绘制过程中添加结点符号,效果类似于画线编辑时的效果
            //设置结点符号
            IRgbColor pRGB = new RgbColorClass();
            pRGB.Red = 255;
            pRGB.Green = 0;
            pRGB.Blue = 0;

            ISimpleMarkerSymbol pSimpleMarkSymbol = new SimpleMarkerSymbolClass();
            pSimpleMarkSymbol.Color = pRGB as IColor;
            pSimpleMarkSymbol.Size = 4;
            pSimpleMarkSymbol.Style = esriSimpleMarkerStyle.esriSMSSquare;

            IMarkerElement pMarkerElement = new MarkerElementClass();
            pMarkerElement.Symbol = pSimpleMarkSymbol as IMarkerSymbol;
            IElement ele = pMarkerElement as IElement;
            ele.Geometry = pt as IGeometry;

            //获取结点element的范围,以便确定刷新范围
            IEnvelope pEnvBounds=new EnvelopeClass();
            ele.QueryBounds(m_hookHelper.ActiveView.ScreenDisplay as IDisplay,pEnvBounds);

            IGraphicsContainer pGra = m_hookHelper.ActiveView as IGraphicsContainer;
            pGra.AddElement(ele, 0);
            m_hookHelper.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGraphics,ele, pEnvBounds); //局部刷新,第二次参数必须是ele,如果是null,画线过程中线就没了,被刷新没了.
            #endregion
        }

        public override void OnMouseMove(int Button, int Shift, int X, int Y)
        {
            // TODO:  Add myAddLine.OnMouseMove implementation
            if (m_LineFeedback == null)
                return;
            IPoint pt = m_hookHelper.ActiveView.ScreenDisplay.DisplayTransformation.ToMapPoint(X, Y);
            m_LineFeedback.MoveTo(pt);
        }

        public override void OnMouseUp(int Button, int Shift, int X, int Y)
        {

            
        }
        public override void OnDblClick()
        {
            IPolyline pPolyline=null;
            IGroupElement pGroupElement = new GroupElementClass();
            
            try
            {
                if (m_LineFeedback == null)
                    return;
                pPolyline = m_LineFeedback.Stop();
                if (pPolyline == null)
                {
                    m_LineFeedback = null;
                    return;
                }
                //设置线型
                IRgbColor pRGB = new RgbColorClass();
                pRGB.Red = 0;
                pRGB.Green = 120;
                pRGB.Blue = 0;

                ISimpleLineSymbol pSimplelineSymbol = new SimpleLineSymbolClass();
                pSimplelineSymbol.Color = pRGB as IColor;
                pSimplelineSymbol.Width = 1.5;
                pSimplelineSymbol.Style = esriSimpleLineStyle.esriSLSSolid;

                //m_LineFeedback.Symbol = pSimplelineSymbol as ISymbol;

                ILineElement pLineElement = new LineElementClass();
                pLineElement.Symbol = pSimplelineSymbol as ILineSymbol;
                IElement element = pLineElement as IElement;
                element.Geometry = pPolyline as IGeometry;

                pGroupElement.AddElement(element);

                绘制结点的第二种方法,全部结束时绘制结点#region 绘制结点的第二种方法,全部结束时绘制结点
                /**/////设置结点符号
                //pRGB = new RgbColorClass();
                //pRGB.Red = 255;
                //pRGB.Green = 0;
                //pRGB.Blue = 0;

                //ISimpleMarkerSymbol pSimpleMarkSymbol = new SimpleMarkerSymbolClass();
                //pSimpleMarkSymbol.Color = pRGB as IColor;
                //pSimpleMarkSymbol.Size = 4;
                //pSimpleMarkSymbol.Style = esriSimpleMarkerStyle.esriSMSSquare;

                /**/////获取得到结点
                //IPointCollection pPointCol = (IPointCollection)pPolyline;
                //for(int index =0;index<pPointCol.PointCount;index++)
                //{
                //    IPoint pt = pPointCol.get_Point(index);
                //    IMarkerElement pMarkerElement = new MarkerElementClass();
                //    pMarkerElement.Symbol = pSimpleMarkSymbol as IMarkerSymbol;
                //    IElement ele = pMarkerElement as IElement;
                //    ele.Geometry = pt as IGeometry;
                //    pGroupElement.AddElement(ele);
                //}
                #endregion
            }
            catch (Exception ex)
            {
                System.Windows.Forms.MessageBox.Show(ex.Message);
               
                return;
            }
            finally
            {
                
                IGraphicsContainer pGraphicsContainer = m_hookHelper.ActiveView as IGraphicsContainer;
                pGraphicsContainer.AddElement(pGroupElement as IElement, ((IPointCollection)pPolyline).PointCount);
                m_hookHelper.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, pGroupElement,pPolyline.Envelope);
                //释放变量
                m_LineFeedback = null;
            }
        }
        #endregion
    }
}