UCS command programatically
Hi,
Here's a way:
static Matrix3d Ucs3Points(Point3d origin, Point3d pointOnXaxis, Point3d pointOnXYplane)
{
Vector3d toXAxis = origin.GetVectorTo(pointOnXaxis).GetNormal();
Vector3d toZAxis = toXAxis.CrossProduct(origin.GetVectorTo(pointOnXYplane)).GetNormal();
Vector3d toYAxis = toZAxis.CrossProduct(toXAxis).GetNormal();
return Matrix3d.AlignCoordinateSystem(
Point3d.Origin, Vector3d.XAxis, Vector3d.YAxis, Vector3d.ZAxis,
origin, toXAxis, toYAxis, toZAxis);
}
Using example:
[CommandMethod("UCS3PTS")]
public static void UcsThreePoints()
{
var ed = Application.DocumentManager.MdiActiveDocument.Editor;
var ppo = new PromptPointOptions("\nNew origin: ");
var ppr = ed.GetPoint(ppo);
if (ppr.Status != PromptStatus.OK)
return;
var org = ppr.Value;
ppo.BasePoint = org;
ppo.UseBasePoint = true;
ppo.Message = "\nPoint on new X axis: ";
ppr = ed.GetPoint(ppo);
if (ppr.Status != PromptStatus.OK)
return;
var pt1 = ppr.Value;
ppo.Message = "\nPoint on new XY plane: ";
ppr = ed.GetPoint(ppo);
if (ppr.Status != PromptStatus.OK)
return;
var pt2 = ppr.Value;
var oldUcs = ed.CurrentUserCoordinateSystem;
var newUcs = Ucs3Points(org.TransformBy(oldUcs), pt1.TransformBy(oldUcs), pt2.TransformBy(oldUcs));
ed.CurrentUserCoordinateSystem = newUcs;
}
Accepted solution
Here's an example using the plane which contains two intersecting lines with the Matrix3d.worldToPlane and Matrix3d.PlaneToWorld transformations.
[CommandMethod("TEST")]
public static void Test()
{
var doc = Application.DocumentManager.MdiActiveDocument;
var db = doc.Database;
var ed = doc.Editor;
var opts = new PromptEntityOptions("\nSelect first line: ");
opts.SetRejectMessage("\nSelected object is not a Line.");
opts.AddAllowedClass(typeof(Line), true);
var rslt = ed.GetEntity(opts);
if (rslt.Status != PromptStatus.OK)
return;
var lineId1 = rslt.ObjectId;
opts.Message = "\nSelect second line: ";
rslt = ed.GetEntity(opts);
if (rslt.Status != PromptStatus.OK)
return;
var lineId2 = rslt.ObjectId;
using (var tr = db.TransactionManager.StartTransaction())
{
var line1 = (Line)tr.GetObject(lineId1, OpenMode.ForRead);
var line2 = (Line)tr.GetObject(lineId2, OpenMode.ForRead);
// get the lines intersection point
var intersPts = new Point3dCollection();
line1.IntersectWith(line2, Intersect.ExtendBoth, intersPts, IntPtr.Zero, IntPtr.Zero);
if (intersPts.Count == 0)
{
ed.WriteMessage("\nNone intersection.");
return;
}
var org = intersPts[0];
// get the vector from the intersection point to the farest point of line1
var pt1 = org.DistanceTo(line1.StartPoint) < org.DistanceTo(line1.EndPoint) ?
line1.EndPoint : line1.StartPoint;
var vect1 = org.GetVectorTo(pt1);
// get the vector from the intersection point to the farest point of line1
var pt2 = org.DistanceTo(line2.StartPoint) < org.DistanceTo(line2.EndPoint) ?
line2.EndPoint : line2.StartPoint;
var vect2 = org.GetVectorTo(pt2);
// get the plane which contains the two lines
var normal = vect1.CrossProduct(vect2);
var plane = new Plane(org, normal);
// get the transformation matrix from WCS to the plane
var xform = Matrix3d.WorldToPlane(plane);
// create an angular dimension on the WCS XY plane using transformed points from WCS to plane
var dim = new LineAngularDimension2();
dim.XLine1Start = dim.XLine2Start = org.TransformBy(xform);
dim.XLine1End = pt1.TransformBy(xform);
dim.XLine2End = pt2.TransformBy(xform);
dim.ArcPoint = (org + (vect1 + vect2) / 2.0).TransformBy(xform);
var space = (BlockTableRecord)tr.GetObject(db.CurrentSpaceId, OpenMode.ForWrite);
space.AppendEntity(dim);
tr.AddNewlyCreatedDBObject(dim, true);
// transform the new created dimension from plane to WCS
dim.TransformBy(Matrix3d.PlaneToWorld(plane));
tr.Commit();
}
}