获取 Curve 坐标方法
/// <summary>/// 获取线对象上的坐标集和突度集
/// </summary>
/// <param name="curve">Curve对象</param>
/// <param name="Point3dColl">坐标集</param>
/// <param name="Bulges">突度集</param>
public static void GetPolylinePoint3dsAndBulge(this Curve curve,ref Point3dCollection Point3dColl,ref DoubleCollection Bulges)
{
try
{
Point3dColl.Clear();
Bulges.Clear();
switch (curve.GetEntityType())
{
case "Polyline":
Polyline polylineObject = (Polyline)curve;
int NumberOfVertices = polylineObject.NumberOfVertices;
for (int i = 0; i < NumberOfVertices; i++)
{
Point3dColl.Add(polylineObject.GetPoint3dAt(i));
Bulges.Add(polylineObject.GetBulgeAt(i));
}
break;
case "Line":
Point3dColl.Add(curve.StartPoint);
Point3dColl.Add(curve.EndPoint);
Bulges.Add(0);
Bulges.Add(0);
break;
case "Arc":
Point3dColl.Add(curve.StartPoint);
Point3dColl.Add(curve.EndPoint);
Bulges.Add(((Arc)curve).GetBulge(true));
Bulges.Add(0);
break;
case "Polyline2d":
Polyline2d polyline2dObject = (Polyline2d)curve;
using (Transaction trans = AcadPropers.Tm.StartTransaction())
{
foreach (ObjectId objId in polyline2dObject)
{
Vertex2d v2d = (Vertex2d)objId.GetEntity(trans, OpenMode.ForRead, false, false);
Point3dColl.Add(v2d.Position);
Bulges.Add(v2d.Bulge);
}
trans.Commit();
}
break;
}
}
catch
{
Point3dColl.Clear();
Bulges.Clear();
}
}
public static Point3dCollection GetPolylinePoint3ds(this Curve curve)
{
try
{
Point3dCollection Point3dColl = new Point3dCollection();
switch (curve.GetEntityType())
{
case "Polyline":
Polyline polylineObject = (Polyline)curve;
int NumberOfVertices = polylineObject.NumberOfVertices;
for (int i = 0; i < NumberOfVertices; i++)
{
Point3dColl.Add(polylineObject.GetPoint3dAt(i));
}
break;
case "Line":
Point3dColl.Add(curve.StartPoint);
Point3dColl.Add(curve.EndPoint);
break;
case "Arc":
Point3dColl.Add(curve.StartPoint);
Point3dColl.Add(curve.EndPoint);
break;
case "Polyline2d":
Polyline2d polyline2dObject = (Polyline2d)curve;
using (Transaction trans = AcadPropers.Tm.StartTransaction())
{
foreach (ObjectId objId in polyline2dObject)
{
Vertex2d v2d = (Vertex2d)objId.GetEntity(trans, OpenMode.ForRead, false, false);
Point3dColl.Add(v2d.Position);
}
trans.Commit();
}
break;
}
return Point3dColl;
}
catch
{
return null;
}
}
/// <summary>
/// 返回CAD对象类型
/// </summary>
/// <param name="ent">对象名称</param>
/// <returns></returns>
public static string GetEntityType(this Entity ent)
{
try
{
return ent.GetType().ToString().Replace("Autodesk.AutoCAD.DatabaseServices.", "");
}
catch
{
return "";
}
}
/// <summary>
/// 获取ObjectId的Entity
/// </summary>
/// <param name="ObjId">对象ID</param>
/// <param name="trans">事务处理对象</param>
/// <param name="openmode">读取模式</param>
/// <returns></returns>
public static DBObject GetEntity(this ObjectId ObjId, Transaction trans, OpenMode openmode, bool openErased, bool forceOpenOnLockeDLayer)
{
try
{
return (DBObject)trans.GetObject(ObjId, openmode, openErased, forceOpenOnLockeDLayer);
}
catch (Exception)
{
return null;
}
}
///后面部分是抄的，原来自己写的方向有时候有问题
///忘记哪里了，急用没留地址，找不到了
///希望这位朋友不要介意啊，哈哈
//计算凸起值
public static double GetBulge(this Arc A, bool SEbo)
{
double Bulge = 0;
double L1 = GetDistance(A.StartPoint, A.EndPoint);
double Angle = A.EndAngle - A.StartAngle;
if (Angle < 0)
{
Angle = Math.PI * 2 + Angle;
//计算圆弧总角度
}
if (Angle > Math.PI)
{
//判断是否大于180度
Bulge = A.Radius + Math.Sqrt(Math.Pow(A.Radius, 2) - Math.Pow((L1 / 2), 2));
//计算凸起值
}
else
{
Bulge = A.Radius - Math.Sqrt(Math.Pow(A.Radius, 2) - Math.Pow((L1 / 2), 2));
//计算凸起值
}
Point3d Pt2 = A.GetPointAtDist(A.GetDistanceAtParameter(A.EndParam) / 2);
//取中点
double TempDouble = 0;
if (SEbo == true)
{
//判断方向
TempDouble = PtSide(A.StartPoint, Pt2, A.EndPoint);
}
else
{
TempDouble = PtSide(A.EndPoint, Pt2, A.StartPoint);
}
if (TempDouble > 0)
{
//判断圆弧是凸向哪边
return -Bulge / (L1 / 2);
}
else
{
return Bulge / (L1 / 2);
}
}
//判断圆弧是凸向哪边
private static double PtSide(Point3d pt1, Point3d pt2, Point3d pt3)
{
Vector3d vect1 = pt1.GetVectorTo(pt2);
Vector3d vect2 = pt1.GetVectorTo(pt3);
return vect2.X * vect1.Y - vect1.X * vect2.Y;
}
扩展方法需要放在静态类里面
<p>小狼兄发贴啦</p><p>大家快来支持啊</p> <p>好东西，支持下，收藏啦</p> <p>收藏一下先。以后有用的时候来再来</p> <p>谢谢。</p><p>我这几一正在看ployline </p><p>再次谢谢！！</p> 终于找到了。支持下
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