求一个c#.net合并直线、多段线、圆弧。。。。的方法，类似CAD内置命令“J”，
求一个c#.net合并直线、多段线、圆弧。。。。的方法，类似CAD内置命令“J”，线段的合并想法就是取出所有点，然后排序生成新的多段线。但是圆弧怎么搞？哪位大神可以指导指导
如果是一个点集合的话，怎么记录哪一段需要转换圆弧，转换的角度怎么记录、一头雾水。
生成多段线的方式是点集+凸度,自己先写一次生成多段线,了解其中的函数.....
凸度换算的方式参考
http://www.lee-mac.com/bulgeconversion.html?tdsourcetag=s_pcqq_aiomsg 通过使用.NET分解复杂区域来创建一系列AutoCAD多段线
https://through-the-interface.typepad.com/through_the_interface/2008/08/creating-a-seri.html /// <summary>
/// 将Line Arc LWPolyline 编辑成LWPolyline,能连接在一起的连接起来
/// 要求端点相接
/// Version : 2007.09.19 Sieben
/// 2007.11.01有改动,未做详细测试
/// 2008.02.14 修改封闭曲线时导致出现零节点的问题
/// </summary>
/// <param name="cur1">第一曲线,若两条曲线连接成一条,则新曲线使用第一曲线一般属性(有例外),不应该为null</param>
/// <param name="cur2">第二曲线,可以为null,这时是编辑单个实体</param>
/// <param name="dTol">一个距离数值,用于作为判断两点重合的标准</param>
/// <returns>成功返回aPolyline,否则返回null</returns>
public static aPolyline JoinPolyline(Curve cur1, Curve cur2, double dTol)
{
try
{
//ae.WriteMessage("\nadb.JoinPolyline start ");
aPolyline pline = null;
if (cur1 == null || cur1.Closed) return null;
if (!cur1.GetType().Equals(typeof(aPolyline)))
{
#region !aPolyline:Line Arc aPolyline
if (cur2 != null && cur2.GetType().Equals(typeof(aPolyline)))
{//第一曲线为非aPolyline,而第二曲线为aPolyline,这时以第二曲线作为第一曲线重新调用函数,此举只为减少代码
return aCur.JoinPolyline(cur2, cur1, dTol);
}
pline = new aPolyline();
if (cur1.GetType().Equals(typeof(Line)))//Line:?
{//曲线为Line,使用其数据生成一个aPolyline
Line line = (Line)cur1;
pline.AddVertexAt(0, new Point2d(line.StartPoint.X, line.StartPoint.Y), 0, 0, 0);
pline.AddVertexAt(1, new Point2d(line.EndPoint.X, line.EndPoint.Y), 0, 0, 0);
pline.SetPropertiesFrom(line);//使用原来实体属性
if (cur2 != null)//若第二曲线不为空,则试图连接两者
pline = aCur.JoinPolyline(pline, cur2, dTol);
return pline;//将新生成的多段线提交到数据库
}
else if (cur1.GetType().Equals(typeof(Arc)))//Arc:?
{//曲线为Line,使用其数据生成一个aPolyline
Arc arc = (Arc)cur1;
Point3d p1 = arc.GetPointAtParameter(arc.EndParam * 0.5 + arc.StartParam * 0.5);
double dltAng = arc.EndAngle - arc.StartAngle;
if (dltAng < 0.0) dltAng += aCon.PI360;//圆弧的结束角比开始角大时
double bulge = Math.Tan(dltAng / 4.0);
if (ag.Clockwise(arc.StartPoint, p1, arc.EndPoint) == -1)//根据圆弧的时钟走向确定凸度正负
bulge = -bulge;
pline.AddVertexAt(0, new Point2d(arc.StartPoint.X, arc.StartPoint.Y), bulge, 0, 0);
pline.AddVertexAt(1, new Point2d(arc.EndPoint.X, arc.EndPoint.Y), 0, 0, 0);
pline.SetPropertiesFrom(arc);//使用原来实体属性
if (cur2 != null)//若第二曲线不为空,则试图连接两者
pline = aCur.JoinPolyline(pline, cur2, dTol);
return pline;//将新生成的多段线提交到数据库
}
else
{//本函数只处理Line Arc aPolyline 三种类型曲线
return null;
}
#endregion !aPolyline:Line Arc aPolyline
}
else if (cur1.GetType().Equals(typeof(aPolyline)))
{
#region aPolyline:Line Arc aPolyline
pline = (aPolyline)cur1;
if (pline.StartPoint.DistanceTo(pline.EndPoint) < dTol)
{//曲线的起点和终点重合,将其封闭属性设置为true
if (!pline.Closed)
pline.Closed = true;
return pline;
}
if (cur2 != null && cur2.GetType().Equals(typeof(Line)))
{//第二曲线为Line,将其加入到多段线里,需注意是加入直线的远点
#region aPolyline:Line
Line line = (Line)cur2;
if (pline.EndPoint.DistanceTo(line.StartPoint) < dTol)
{
pline.AddVertexAt(pline.NumberOfVertices, new Point2d(line.EndPoint.X, line.EndPoint.Y), 0, 0, 0);
}
else if (pline.EndPoint.DistanceTo(line.EndPoint) < dTol)
{
pline.AddVertexAt(pline.NumberOfVertices, new Point2d(line.StartPoint.X, line.StartPoint.Y), 0, 0, 0);
}
else if (pline.StartPoint.DistanceTo(line.StartPoint) < dTol)
{
pline.AddVertexAt(0, new Point2d(line.EndPoint.X, line.EndPoint.Y), 0, 0, 0);
}
else if (pline.StartPoint.DistanceTo(line.EndPoint) < dTol)
{
pline.AddVertexAt(0, new Point2d(line.StartPoint.X, line.StartPoint.Y), 0, 0, 0);
}
#endregion aPolyline:Line
}
else if (cur2 != null && cur2.GetType().Equals(typeof(Arc)))
{
#region aPolyline:Arc
//第二曲线为Arc,将其加入到多段线里,需注意凸度的计算及正负
//凸度的大小由圆弧的圆周角计算可得,
//凸度的正负先根据圆弧的时钟走向得到一个值,然后在根据圆弧的近点,中点,远点三点的时钟走向
//还有在aPolyline里是后加入还是前插入来最终确定正负
Arc arc = (Arc)cur2;
Point3d p1 = arc.GetPointAtParameter(arc.EndParam * 0.5 + arc.StartParam * 0.5);
double dltAng = arc.EndAngle - arc.StartAngle;
if (dltAng < 0.0) dltAng += aCon.PI360;
double bulge = Math.Tan(dltAng / 4.0);
if (pline.EndPoint.DistanceTo(arc.StartPoint) < dTol)
{//末端接入,根据圆弧近点,中点,远点确定凸度正负
if (ag.Clockwise(arc.StartPoint, p1, arc.EndPoint) == -1)
bulge = -bulge;
pline.AddVertexAt(pline.NumberOfVertices, new Point2d(arc.EndPoint.X, arc.EndPoint.Y), 0, 0, 0);
pline.SetBulgeAt(pline.NumberOfVertices - 2, bulge);//注意凸度段序号
}
else if (pline.EndPoint.DistanceTo(arc.EndPoint) < dTol)
{//末端接入,根据圆弧近点,中点,远点确定凸度正负
if (ag.Clockwise(arc.EndPoint, p1, arc.StartPoint) == -1)
bulge = -bulge;
pline.AddVertexAt(pline.NumberOfVertices, new Point2d(arc.StartPoint.X, arc.StartPoint.Y), 0, 0, 0);
pline.SetBulgeAt(pline.NumberOfVertices - 2, bulge);
}
else if (pline.StartPoint.DistanceTo(arc.StartPoint) < dTol)
{//开始端接入,根据圆弧远点,中点,近点确定凸度正负
if (ag.Clockwise(arc.EndPoint, p1, arc.StartPoint) == -1)
bulge = -bulge;
pline.AddVertexAt(0, new Point2d(arc.EndPoint.X, arc.EndPoint.Y), bulge, 0, 0);
}
else if (pline.StartPoint.DistanceTo(arc.EndPoint) < dTol)
{//开始端接入,根据圆弧远点,中点,近点确定凸度正负
if (ag.Clockwise(arc.StartPoint, p1, arc.EndPoint) == -1)
bulge = -bulge;
pline.AddVertexAt(0, new Point2d(arc.StartPoint.X, arc.StartPoint.Y), bulge, 0, 0);
}
#endregion aPolyline:Arc
}
else if (cur2 != null && cur2.GetType().Equals(typeof(aPolyline)))
{
#region aPolyline:aPolyline
aPolyline pline2 = (aPolyline)cur2;
if (pline.EndPoint.DistanceTo(pline2.StartPoint) < dTol)
{ //第一曲线末端接入,第二曲线正向加入
for (int i = 1; i < pline2.NumberOfVertices; i++)//一段段的读出,加入另外曲线
{
pline.AddVertexAt(pline.NumberOfVertices, pline2.GetPoint2dAt(i), 0, 0, 0);
pline.SetBulgeAt(pline.NumberOfVertices - 2, pline2.GetBulgeAt(i - 1));//注意凸度段序号
}
}
else if (pline.EndPoint.DistanceTo(pline2.EndPoint) < dTol)
{//末端接入,第二曲线逆向加入,第二曲线原有凸度需反向
for (int i = pline2.NumberOfVertices - 2; i >= 0; i--)
{
pline.AddVertexAt(pline.NumberOfVertices, pline2.GetPoint2dAt(i), 0, 0, 0);
pline.SetBulgeAt(pline.NumberOfVertices - 2, -pline2.GetBulgeAt(i));
}
}
else if (pline.StartPoint.DistanceTo(pline2.StartPoint) < dTol)
{
//第一曲线开始端入,第二曲线逆向加入,第二曲线原有凸度需反向
for (int i = 1; i < pline2.NumberOfVertices; i++)
{
pline.AddVertexAt(0, pline2.GetPoint2dAt(i), 0, 0, 0);
pline.SetBulgeAt(0, -pline2.GetBulgeAt(i - 1));
}
}
else if (pline.StartPoint.DistanceTo(pline2.EndPoint) < dTol)
{
//第一曲线开始端入,第二曲线正向加入
for (int i = pline2.NumberOfVertices - 2; i >= 0; i--)
{
pline.AddVertexAt(0, pline2.GetPoint2dAt(i), 0, 0, 0);
pline.SetBulgeAt(0, pline2.GetBulgeAt(i));
}
}
#endregion aPolyline:aPolyline
}
else
{
return null;
}
if (pline.StartPoint.DistanceTo(pline.EndPoint) < dTol) //如果曲线起点和终点重合,将Closed = true
{
pline.Closed = true;
//2008.02.14注意：即使起点和终点已重合，pline.Closed = true还是会增加一个节点，导致多段线出现零节点
pline.RemoveVertexAt(pline.NumberOfVertices - 1);
}
return pline;
#endregion aPolyline:Line Arc aPolyline
}
return pline;
}
catch (System.Exception ex)
{
ae.WriteMessage(ex);
return null;
}
}
非不想分享全部，但涉及的代码太多了，没有时间。
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