public void AddTriangle()
{
Database db = HostApplicationServices.WorkingDatabase;
using (Transaction trans = db.TransactionManager.StartTransaction())
{
BlockTable bt = (BlockTable)trans.GetObject(db.BlockTableId, OpenMode.ForRead);
BlockTableRecord btr = (BlockTableRecord)trans.GetObject(db.CurrentSpaceId, OpenMode.ForWrite);
// 提示用户拾取三点
Point3d pt1 = new Point3d();
Point3d pt2 = new Point3d();
Point3d pt3 = new Point3d();
if (GetPoint("\n输入起点:", out pt1) &&
GetPoint("\n输入终点:", pt1, out pt2) &&
GetPoint("\n输入终点:", pt2, out pt3))
{
MgTriangle triangle = new MgTriangle(pt1, pt2, pt3);
double area = triangle.Area;
btr.AppendEntity(triangle);
trans.AddNewlyCreatedDBObject(triangle, true);
Editor ed = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument.Editor;
ed.WriteMessage("\n三角形的面积:{0}", area);
trans.Commit();
}
}
}
public void test()
{
Database db = HostApplicationServices.WorkingDatabase;
Editor ed = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument.Editor;
PromptEntityOptions opt = new PromptEntityOptions("\n请选择对象");
PromptEntityResult res = ed.GetEntity(opt);
using (Transaction trans = db.TransactionManager.StartTransaction())
{
Entity ent = trans.GetObject(res.ObjectId, OpenMode.ForWrite) as Entity;
if (ent is MgTriangle)
{
MgTriangle triangle = ent as MgTriangle;
triangle.ColorIndex = 1;
trans.Commit();
}
}
}
