简单的写了下 只实现了选点的 很多东东都没考虑 O(∩_∩)O~
class PolygonJig: DrawJig
{
enum SelectState
{
OnPoint,
OnEdge
}
Polyline _pl;
SelectState state = SelectState.OnPoint;
Point3d _position;
int _id;
public PolygonJig(Polyline pl, int id)
{
_pl = pl;
_id = id;
}
protected override SamplerStatus Sampler(JigPrompts prompts)
{
switch (state)
{
case SelectState.OnPoint:
JigPromptPointOptions jigOpts = new JigPromptPointOptions();
jigOpts.UserInputControls =
UserInputControls.Accept3dCoordinates |
UserInputControls.NoZeroResponseAccepted |
UserInputControls.NoNegativeResponseAccepted;
PromptPointResult res = prompts.AcquirePoint(jigOpts);
Point3d pnt = res.Value;
if (pnt != _position)
_position = pnt;
else
return SamplerStatus.NoChange;
if (res.Status == PromptStatus.Cancel)
return SamplerStatus.Cancel;
else
return SamplerStatus.OK;
case SelectState.OnEdge:
return SamplerStatus.Cancel;
}
return SamplerStatus.Cancel;
}
protected override bool WorldDraw(Autodesk.AutoCAD.GraphicsInterface.WorldDraw draw)
{
_pl.SetPointAt(_id, _position.Convert2d(new Plane()));
draw.Geometry.Draw(_pl);
draw.Geometry.Text(_position, Vector3d.ZAxis, Vector3d.XAxis, 20, 0.75, 0, _pl.Area.ToString());
return true;
}
}
public static void CC()
{
Document doc = Application.DocumentManager.MdiActiveDocument;
Editor ed = doc.Editor;
Database db = doc.Database;
var optEnt = new PromptEntityOptions("\n请选择多边形");
optEnt.SetRejectMessage("选择错误！");
optEnt.AddAllowedClass(typeof(Polyline), false);
var resEnt = ed.GetEntity(optEnt);
if (resEnt.Status != PromptStatus.OK)
return;
using (var tr = db.TransactionManager.StartTransaction())
{
Polyline pl = tr.GetObject(resEnt.ObjectId, OpenMode.ForWrite) as Polyline;
pl.Highlight();
int n = Convert.ToInt32(Math.Round(pl.GetParameterAtPoint(pl.GetClosestPointTo(resEnt.PickedPoint, true)), MidpointRounding.AwayFromZero));
if (n >= pl.EndParam) n = 0;
var jig = new PolygonJig(pl, n);
ed.Drag(jig);
tr.Commit();
}
}
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