資源簡介
等高線追蹤
基于TIN繪制等高線直接利用原始觀測數據，避免了DTM內插的精度損失，因而等高線精度
較高；對高程注記點附近的較短封閉等高線也能繪制；繪制的等高線分布在采樣區域內而
并不要求采樣區域有規則四邊形邊界。而同一高程的等高線只穿過一個三角形最多一次，
因而程序設計也較簡單。但是，由于TIN的存貯結構不同，等高線的具體跟蹤算法跟蹤也有
所不同。
基于三角形搜索的等高線繪制算法如下：
對于記錄了三角形表的TIN，按記錄的三角形順序搜索。其基本過程如下：
1）對給定的等高線高程h，與所有網點高程zi（i=1,2,?，n），進行比較，若zi=h
，則將zi加上（或減）一個微小正數ε> 0（如ε=10-4），以使程序設計簡單而又不影響
等高線的精度。
2）設立三角形標志數組，其初始值為零，每一元素與一個三角形對應，凡處理過的三角形
將標志置為1，以后不再處理，直至等高線高程改變。
3）按順序判斷每一個三角形的三邊中的兩條邊是否有等高線穿過。若三角形一邊的兩端點
為P1（x1，y1，z1），P2（x2，y2，z2）則
(z1-h)(z2-h)0表明該邊無等高線點。
直至搜索到等高線與網邊的第一個交點，稱該點為搜索起點，也是當前三角形的等高線進
入邊、線性內插該點的平面坐標（x，y）：
代碼片段和文件信息
using?System?;
using?Autodesk.AutoCAD.Runtime?;
using?Autodesk.AutoCAD.DatabaseServices;
using?Autodesk.AutoCAD.EditorInput;
using?Autodesk.AutoCAD.ApplicationServices;
using?Autodesk.AutoCAD.Geometry;
using?Autodesk.AutoCAD.Colors;
[assembly:?CommandClass（typeof（AcDbLib.Init））]
namespace?AcDbLib
{
public?class?AcDb
{
public?AcDb（）
{
?????}
public?static?objectId?CreateNewlayer（string?layerName）??????????//new?layer
{
objectId?layerId;
Database?db=HostApplicationServices.WorkingDatabase;
Transaction?trans=db.TransactionManager.StartTransaction（）;
layerTable?lt=（layerTable）trans.Getobject（db.layerTableIdOpenMode.ForWrite）;
if（!lt.Has（layerName））
{
layerTableRecord?ltr=new?layerTableRecord（）;
ltr.Name=layerName;
ltr.Color?=?Color.FromColorIndex（ColorMethod.ByAci?2）;
layerId=lt.Add（ltr）;
trans.AddNewlyCreatedDBobject（ltrtrue）;
}
else
{
layerId=lt[layerName];
}
db.Clayer=layerId;
trans.Commit（）;
trans.Dispose（）;
return?layerId;
}
public?static?objectId?CreateBlock（string?blockName）???//帶屬性的塊
{
????
Database?db=HostApplicationServices.WorkingDatabase;
Transaction?trans=db.TransactionManager.StartTransaction（）;
//Editor?ed=Application.DocumentManager.MdiActiveDocument.Editor;
BlockTable?bt=（BlockTable）trans.Getobject（db.BlockTableIdOpenMode.ForWrite）;
objectId?blockId;
if（!bt.Has（blockName））
{
BlockTableRecord?btr=new?BlockTableRecord（）;
btr.Name=blockName;
Point3d?basePoint=new?Point3d（000）;
btr.Origin=basePoint;
//Circle?circle=new?Circle（basePointVector3d.ZAxis1）;
//circle.Color=Color.FromColorIndex（ColorMethod.ByAci1）;
// ????Point3dCollection?pointArray=new?Point3dCollection（）;
// Point3d?pos1=new?Point3d（-200）;
// pointArray.Add（pos1）;
// Point3d?pos2=new?Point3d（200）;
// pointArray.Add（pos2）;
// Point3d?pos3=new?Point3d（02.50）;
// pointArray.Add（pos3）;
// Polyline2d?pLine=new?Polyline2d（Poly2dType.SimplePolypointArray0.0true00null）;
DBPoint?pnt=?new?DBPoint（basePoint）;
pnt.Color=Color.FromColorIndex（ColorMethod.ByAci1）;
btr.AppendEntity（pnt）;
//屬性加入
AttributeDefinition?Attr=new?AttributeDefinition（basePoint“abc““tag““input“db.Textstyle）;
Point3d?attPoint=new?Point3d（basePoint.X+1*1000.0/Init.blcbasePoint.YbasePoint.Z）;
Attr.Position=attPoint;
Attr.Prompt=“pointName“;
//Attr.HorizontalMode=Autodesk.AutoCAD.DatabaseServices.TextHorizontalMode.TextAlign;
Attr.Color=Color.FromColorIndex（ColorMethod.ByAci1）;
Attr.Height=1*1000.0/Init.blc;
btr.AppendEntity（Attr）;
AttributeDefinition?Attr1=（AttributeDefinition）Attr.Clone（）;?//對第1個屬性克隆
Point3d?attPoint1=new?Point3d（basePoint.X+1*1000.0/Init.blcbasePoint.Y-Attr.HeightbasePoint.Z）;
Attr1.Position=attPoint1;
Attr1.Prompt=“gaocheng“;
At ?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????文件???????8834??2006-04-13?09:28??等高線追蹤\measure\abc.text
?????文件???????1977??2006-04-11?17:39??等高線追蹤\measure\acad.err
?????文件???????7164??2006-04-11?10:11??等高線追蹤\measure\AcDbLib.cs
?????文件???????3417??2006-04-03?14:30??等高線追蹤\measure\AssemblyInfo.cs
?????文件???????7164??2006-04-11?10:11??等高線追蹤\measure\Backup\AcDbLib.cs
?????文件???????3417??2006-04-03?14:30??等高線追蹤\measure\Backup\AssemblyInfo.cs
?????文件???????3088??2006-04-13?09:26??等高線追蹤\measure\Backup\EqualLine.cs
?????文件???????3737??2006-04-13?09:02??等高線追蹤\measure\Backup\ExtPoint.cs
?????文件???????5373??2006-04-12?15:53??等高線追蹤\measure\Backup\measure.csproj
?????文件???????1866??2006-04-13?09:53??等高線追蹤\measure\Backup\measure.csproj.user
?????文件????????910??2006-04-03?14:30??等高線追蹤\measure\Backup\measure.sln
????..A..H.?????10240??2006-04-13?09:53??等高線追蹤\measure\Backup\measure.suo
?????文件??????17131??2006-04-13?08:55??等高線追蹤\measure\Backup\TINandDEM.cs
?????文件???????2263??2006-04-05?10:17??等高線追蹤\measure\Backup\UserControl1.cs
?????文件???????5322??2006-04-05?10:17??等高線追蹤\measure\Backup\UserControl1.resx
?????文件??????????0??2006-04-05?09:22??等高線追蹤\measure\bin\abc.text
?????文件????3903488??2007-02-12?04:59??等高線追蹤\measure\bin\Debug\AcDbMgd.dll
?????文件????1036288??2007-02-12?05:01??等高線追蹤\measure\bin\Debug\AcMgd.dll
?????文件??????68640??2013-09-27?11:29??等高線追蹤\measure\bin\Debug\Drawing1.dwg
?????文件??????32768??2013-09-27?11:28??等高線追蹤\measure\bin\Debug\measure.dll
?????文件??????48640??2013-09-27?11:28??等高線追蹤\measure\bin\Debug\measure.pdb
?????文件???????3088??2006-04-13?09:26??等高線追蹤\measure\EqualLine.cs
?????文件???????3737??2006-04-13?09:02??等高線追蹤\measure\ExtPoint.cs
?????文件???????6583??2013-09-27?11:27??等高線追蹤\measure\measure.csproj
?????文件???????2543??2013-09-27?11:28??等高線追蹤\measure\measure.csproj.user
?????文件????????898??2013-09-27?11:23??等高線追蹤\measure\measure.sln
????..A..H.?????15360??2013-09-27?11:29??等高線追蹤\measure\measure.suo
?????文件?????742458??2013-09-27?11:27??等高線追蹤\measure\measureDXCore.Solution\AssemblyCache\d3ff2683557646bddbd380ddf7d1fb7.cache
?????文件????2627301??2013-09-27?11:26??等高線追蹤\measure\measureDXCore.Solution\AssemblyCache\dd55ab6d8e8eeda691a98e1980bce2a0.cache
?????文件????????818??2013-09-27?11:27??等高線追蹤\measure\obj\Debug\measure.csproj.FileListAbsolute.txt
............此處省略30個文件信息
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