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c#取得多段线中圆弧中点坐标 - 精华帖集合
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c#取得多段线中圆弧中点坐标
其实很简单的，但是不懂所以弄了好久才出来！现在贴出来和菜鸟们交流，高手请指教
c#取得多段线中圆弧中点坐标
搞了好久才弄明白怎么取得多段线中点的坐标值，以下是代码，和大家交流一下！其实还有更好的方法，我也是写出这段代码之后才在高手指导下知道第二种方法的，也一起贴出来。
using system;
using autodesk.autocad.runtime;
using autodesk.autocad.databaseservices;
using autodesk.autocad.geometry;
using autodesk.autocad.graphicsinterface;
using autodesk.autocad.editorinput;
using autodesk.autocad.applicationservices;
[assembly: extensionapplication(typeof(classlibrary.lab8class))]
[assembly: commandclass(typeof(classlibrary.lab8class))]
namespace classlibrary
{
public class lab8class:iextensionapplication
{
public void initialize()
{
autodesk.autocad.applicationservices.application.documentmanager.mdiactivedocument.editor.writemessage("\n调试程序命令lv");//初始化操作
}
public void terminate()
{
//清除操作
}

public lab8class()
{
//
// todo: add constructor logic here
//
}
editor ed = application.documentmanager.mdiactivedocument.editor;
database db = autodesk.autocad.databaseservices.hostapplicationservices.workingdatabase;
autodesk.autocad.databaseservices.transactionmanager tm = autodesk.autocad.databaseservices.hostapplicationservices.workingdatabase.transactionmanager;
// define command "asdkcmd1"
[commandmethod("lv")]
public void getplpoint() // this method can have any name
{
try
{
transaction trans=tm.starttransaction();
// blocktablerecord btr;
// blocktable bt;
using(trans)
{
promptentityresult per = ed.getentity("请选择多段线");
if(per.status == promptstatus.ok)
{
dbobject obj = trans.getobject(per.objectid, openmode.forread);
{
polyline pl = obj as polyline;
int vn = pl.numberofvertices;
for(int i = 0; i<= vn; i++)
{
point3d pt3d = pl.getpoint3dat(i-1);
double vbulge = pl.getbulgeat(i);
if(vbulge != 0)
{
//方法一，比较笨的方法。
double len0 = pl.getdistatpoint(pl.getpoint3dat(i));
double len1 = pl.getdistatpoint(pl.getpoint3dat(i+1));
double midlen = (len0 + len1)/2;
ed.writemessage("\n第二种方法计算的圆弧中点是：" + midp3d.tostring());
//方法二，但是速度比较慢好像，因为如果加上下面的代码，运行速度明显慢，前面是感觉不出来的，后面的要停顿一下，可能有异常
point3d midl = pl.getpointatparameter(i+0.5);
ed.writemessage("\n第二种方法计算的圆弧中点是：" + midl.tostring());
}
}
}
}
trans.commit();
trans.dispose();
}
}
catch{}
finally
{
}
}
}
}
复制代码
很好，已经加精了。
c#最适合开发autocad，因为它拥有vb容易的特点，却具有vc++的强大功能。
getpointatparameter这个好用哦。。。楼主提供这么好的代码。。。
感谢楼主的分享