ArcGIS Engine 绘制平行线

AO开发包为我们提供了绘制平行线的工具 ControlsEditingSketchParallelCommand ，但是它必须宿主在编辑右键菜单上 ControlsEditingSketchContextMenu。对于熟悉ArcGIS Engine开发的朋友完全可以自己开发实现绘制平行线功能。本文为大家介绍实现平行线绘制的一些思路。

确定平行线绘制起点，选择参考的基准线

接下来绘制平行线时大家发现鼠标画线已经被限定在与参考线平行那条线上

using System;
using System.Drawing;
using System.Runtime.InteropServices;
using System.Collections.Generic;
using ESRI.ArcGIS.ADF.BaseClasses;
using ESRI.ArcGIS.ADF.CATIDs;
using ESRI.ArcGIS.Controls;
using ESRI.ArcGIS.Geometry;
using ESRI.ArcGIS.Display;
using ESRI.ArcGIS.Carto;
using ESRI.ArcGIS.Geodatabase;
using ESRI.ArcGIS.esriSystem;
using System.Text.RegularExpressions;
using System.Windows.Forms;namespace Parallel
{/// /// Summary description for ParallelTool1./// [Guid("f4afe519-b3a0-454d-9615-e64f2b18ff53")][ClassInterface(ClassInterfaceType.None)][ProgId("demo.Parallel.ParallelTool1")]public sealed class ParallelTool1 : BaseTool{#region COM Registration Function(s)[ComRegisterFunction()][ComVisible(false)]static void RegisterFunction(Type registerType){// Required for ArcGIS Component Category Registrar supportArcGISCategoryRegistration(registerType);//// TODO: Add any COM registration code here//}[ComUnregisterFunction()][ComVisible(false)]static void UnregisterFunction(Type registerType){// Required for ArcGIS Component Category Registrar supportArcGISCategoryUnregistration(registerType);//// TODO: Add any COM unregistration code here//}#region ArcGIS Component Category Registrar generated code/// /// Required method for ArcGIS Component Category registration -/// Do not modify the contents of this method with the code editor./// private static void ArcGISCategoryRegistration(Type registerType){string regKey = string.Format("HKEY_CLASSES_ROOT\\CLSID\\{{{0}}}", registerType.GUID);ControlsCommands.Register(regKey);}/// /// Required method for ArcGIS Component Category unregistration -/// Do not modify the contents of this method with the code editor./// private static void ArcGISCategoryUnregistration(Type registerType){string regKey = string.Format("HKEY_CLASSES_ROOT\\CLSID\\{{{0}}}", registerType.GUID);ControlsCommands.Unregister(regKey);}#endregion#endregionprivate IHookHelper m_hookHelper;private IMapControl3 m_mapControl;//private IPolyline pPolyline = null;private IPolyline pPolyline_Parallel = null;private INewLineFeedback pDraglineFeedBack = null;private List AddPs = new List();private int Flag = 0;private double dis = 0;private double angle = 0;public ParallelTool1(){//// TODO: Define values for the public properties//base.m_category = ""; //localizable text base.m_caption = "";  //localizable text base.m_message = "";  //localizable textbase.m_toolTip = "";  //localizable textbase.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/// /// Occurs when this tool is created/// /// Instance of the applicationpublic override void OnCreate(object hook){if (m_hookHelper == null)m_hookHelper = new HookHelperClass();m_hookHelper.Hook = hook;// TODO:  Add ParallelTool1.OnCreate implementationm_mapControl = hook as IMapControl3;}/// /// Occurs when this tool is clicked/// public override void OnClick(){// TODO: Add ParallelTool1.OnClick implementation}public override void OnMouseDown(int Button, int Shift, int X, int Y){// TODO:  Add ParallelTool1.OnMouseDown implementationtry{IPoint sStartPoint = m_mapControl.ToMapPoint(X, Y);if (pDraglineFeedBack == null){pDraglineFeedBack = new NewLineFeedback();}pDraglineFeedBack.Display = m_mapControl.ActiveView.ScreenDisplay;if (Flag == 0){pDraglineFeedBack.Start(sStartPoint);Flag += 1;}else{if (pPolyline_Parallel == null)CatchSel(m_mapControl.Map, X, Y);if (pPolyline_Parallel == null)pDraglineFeedBack.Start(sStartPoint);else{if (Flag == 2){}else{IPoint pPoint = SetMouseLocation(X, Y);pDraglineFeedBack.Start(pPoint);}}}}catch (Exception er){MessageBox.Show(er.Message, "提示", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);}}public override void OnMouseMove(int Button, int Shift, int X, int Y){// TODO:  Add ParallelTool1.OnMouseMove implementationtry{if (pDraglineFeedBack == null) return;if (pPolyline_Parallel == null){IPoint sPoint = m_mapControl.ToMapPoint(X, Y);pDraglineFeedBack.MoveTo(sPoint);}else{IPoint pPoint = SetMouseLocation(X, Y);pDraglineFeedBack.MoveTo(pPoint);}}catch { }}public override void OnMouseUp(int Button, int Shift, int X, int Y){// TODO:  Add ParallelTool1.OnMouseUp implementationtry{if (pDraglineFeedBack == null) return;IPoint sPoint = null;if(pPolyline_Parallel == null)sPoint = m_mapControl.ToMapPoint(X, Y);elsesPoint = SetMouseLocation(X, Y);if (Button == 1){if (Flag != 2){pDraglineFeedBack.AddPoint(sPoint);AddPs.Add(sPoint);if (AddPs.Count == 2){pPolyline_Parallel = pDraglineFeedBack.Stop();IFeatureLayer sFlyr = Publics.Functions.G_Funs.getFlyrByName(m_mapControl.Map, "燃气-管线");IDataset pDS = sFlyr.FeatureClass as IDataset;IWorkspaceEdit pWSEdit = pDS.Workspace as IWorkspaceEdit;pWSEdit.StartEditing(true);pWSEdit.StartEditOperation();IFeature pFea = sFlyr.FeatureClass.CreateFeature();pFea.Shape = pPolyline_Parallel;pFea.Store();pWSEdit.StopEditOperation();//m_mapControl.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeography, sFlyr, m_mapControl.Extent);pDraglineFeedBack = null;AddPs.Clear();Flag = 0;pPolyline_Parallel = null;//m_mapControl.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, null, m_mapControl.Extent);m_mapControl.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewAll, null, m_mapControl.Extent);}}else{Flag += 1;}}//else if (Button == 2)//{//    pDraglineFeedBack.Stop();//    pDraglineFeedBack = null;//    AddPs.Clear();//    Flag = 0;//    pPolyline_Parallel = null;//    m_mapControl.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, null, m_mapControl.Extent);//}}catch (Exception er){MessageBox.Show(er.Message, "提示", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);}}#endregionprivate void CatchSel(IMap sMap, int X, int Y){try{Publics.Functions.G_Funs.ClearSelection(m_mapControl);for (int i = 0; i < sMap.LayerCount; i++){//管线上加点ILayer pLayer = sMap.get_Layer(i);if (Regex.IsMatch(pLayer.Name, "-参考线", RegexOptions.IgnoreCase)){ESRI.ArcGIS.Geometry.IPoint pt = new ESRI.ArcGIS.Geometry.PointClass();pt = m_mapControl.ToMapPoint(X, Y);//点击处做缓冲区double dis = Publics.Functions.G_Funs.ConvertPixelsToMapUnits(m_mapControl, 20);ITopologicalOperator pTopo = pt as ITopologicalOperator;IGeometry geo = pTopo.Buffer(dis);esriGeometryType geoType = (pLayer as IFeatureLayer).FeatureClass.ShapeType;esriFeatureType FeatureType = (pLayer as IFeatureLayer).FeatureClass.FeatureType;//空间查询条件ISpatialFilter pSpatial = new SpatialFilterClass();pSpatial.Geometry = geo;pSpatial.SpatialRel = esriSpatialRelEnum.esriSpatialRelIntersects;if (geoType == esriGeometryType.esriGeometryPoint)pSpatial.SpatialRel = esriSpatialRelEnum.esriSpatialRelContains;IFeatureCursor pFeatureCursor = (pLayer as IFeatureLayer).FeatureClass.Search(pSpatial, false);if (pFeatureCursor != null){IFeature pFeature = pFeatureCursor.NextFeature();if (pFeature != null){IPolyline pPolyline = pFeature.ShapeCopy as IPolyline;计算管线上点IProximityOperator pProximityOperator = pFeature.ShapeCopy as IProximityOperator;//IPoint pNearsetPoint = new ESRI.ArcGIS.Geometry.PointClass();//pProximityOperator.QueryNearestPoint(pt, esriSegmentExtension.esriExtendEmbedded, pNearsetPoint);将管线上的点添加到临时图元//Publics.Functions.G_Funs.AddMarkerElement(m_mapControl.Map, pNearsetPoint);//pt = AddPs[AddPs.Count - 1];dis = pProximityOperator.ReturnDistance(AddPs[AddPs.Count - 1]);IPoint pNearsetPoint = new ESRI.ArcGIS.Geometry.PointClass();pProximityOperator.QueryNearestPoint(AddPs[AddPs.Count - 1], esriSegmentExtension.esriExtendEmbedded, pNearsetPoint);ILine pLine = new LineClass();//pLine.FromPoint = pPolyline.FromPoint;//pLine.ToPoint = pPolyline.ToPoint;//angle = pLine.Angle;//if (angle < 0)//{//    angle = angle +180*Math.PI/180;//}//double dx = dis / Math.Sin(angle);//double dy = dis / Math.Cos(angle);IClone pClone = pPolyline as IClone;ITransform2D pTransform2D = pClone.Clone() as ITransform2D;//pTransform2D.Move(dx, dy);pLine = new LineClass();pLine.FromPoint = pNearsetPoint;pLine.ToPoint = AddPs[AddPs.Count - 1];pTransform2D.MoveVector(pLine);pPolyline_Parallel = pTransform2D as IPolyline;//IFeatureLayer sFlyr = pLayer as IFeatureLayer;//IFeature pFea = sFlyr.FeatureClass.CreateFeature();//pFea.Shape = pPolyline_Parallel;//pFea.Store();//m_mapControl.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeography, pLayer, m_mapControl.Extent);Flag = 2;return;}Publics.Functions.G_Funs.pReleaseObj(pFeatureCursor);pFeatureCursor = null;if (pFeature != null) return;}}}}catch (Exception er){MessageBox.Show(er.Message, "提示", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);}}private IPoint SetMouseLocation(int X, int Y){try{IPoint pPoint = m_mapControl.ToMapPoint(X, Y);IProximityOperator pProximityOperator = pPolyline_Parallel as IProximityOperator;IPoint pNearsetPoint = new ESRI.ArcGIS.Geometry.PointClass();pProximityOperator.QueryNearestPoint(pPoint, esriSegmentExtension.esriExtendEmbedded, pNearsetPoint);return pNearsetPoint;}catch (Exception er){MessageBox.Show(er.Message, "提示", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);return null;}}}
}

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