CAD中圆可转为带有凸度的多段线以方便后期数据计算、处理,效果如下:
白色为圆,红色为转换后的多段线(为区分,已手工偏移多段线)
cs
public static void XX()
{
var curves = Z.db.SelectEntities<Entity>();
foreach (var item in curves)
{
if (item is Circle)
{
Circle temp = (Circle)item;
Point3d pt = temp.Center;
double leftx = pt.X - temp.Radius;
double rightx = pt.X + temp.Radius;
double topx = pt.X;
double bottomx = pt.X;
double lefty = pt.Y;
double righty = pt.Y;
double topy = pt.Y + temp.Radius;
double bottomy = pt.Y - temp.Radius;
Point2d left = new Point2d(leftx, lefty);
Point2d right = new Point2d(rightx, righty);
Point2d top = new Point2d(topx, topy);
Point2d bottom = new Point2d(bottomx, bottomy);
Polyline pl = new Polyline();
pl.AddVertexAt(0, bottom, 1, 0, 0);
pl.AddVertexAt(1, top, 1, 0, 0);
pl.AddVertexAt(2, bottom, 0, 0, 0);
pl.ColorIndex = 1;
Z.db.AddEntityToModeSpace(pl);
pl.Highlight();
// Debugger.Break();
}
//else
//{
// Z.db.Erase(item);
//}
}
}