topic AutoCAD BlockReference with Attribute Reference - Rotate Attribute Reference to TOP View in .NET Forum

AutoCAD BlockReference with Attribute Reference - Rotate Attribute Reference to TOP View

rberghLJ4SA — Fri, 07 Oct 2022 11:03:14 GMT

Hi,

I am looking for some help, we have a block reference that has been placed on a UCS. I'd like to rotate the Attribute Reference to the top view for printing purposes.

The Block Reference looks like this

block reference Normal: {(-0.447489037915538,0.774278908692316,-0.447488248448676)}

block reference Rotation: 3.1415916339744827

block reference BlockTransform: {((2.07792693857256,0.537401292332017,-1.07397369099729,139.455483961257),(1.20092449302597,-0.929846906863022,1.85826938086156,127.146580516264),(2.18839580212737E-06,-2.14629554833372,-1.07397179627682,-50),(0,0,0 ,one))}

block reference Position: {(139.455483961257,127.146580516264,-50)}

The Attribute Reference looks like this

Attribute Reference Normal: {(-0.447489037915538,0.774278908692316,-0.447488248448676)}

Attribute Reference Rotation: 3.1415916339744827

Attribute Reference Position: {(140.xxx-xxxxxxxx,127.319427379831,-51.2288381400736)}

How do I go about transforming the Attribute reference so viewable from the top

Re: AutoCAD BlockReference with Attribute Reference - Rotate Attribute Reference to TOP View

rberghLJ4SA — Fri, 07 Oct 2022 13:21:43 GMT

if (br.AttributeCollection != null && br.AttributeCollection.Count != 0) { foreach (ObjectId id in br.AttributeCollection) { DBObject obj = acTrans.GetObject(id, OpenMode.ForRead); AttributeReference ar = obj as AttributeReference; if (ar != null && ar.Normal == new Vector3d(0, 0, 1)) { ar.UpgradeOpen(); Matrix3d brMat = br.BlockTransform; //Keep current position Point3d pos = new Point3d(ar.Position.X, ar.Position.Y, ar.Position.Z); Vector3d targetNormal = new Vector3d(0, 0, 1); //Set new normal and put back the position. ar.Normal = targetNormal; ar.Position = pos; //Get projection matrix Plane targetPlane = new Plane(new Point3d(0, 0, 0), targetNormal); Matrix3d mat = Matrix3d.Projection(targetPlane, targetNormal); //Compute the rotation on WCS. //We do this by taking the XAxis of blockTransform and projecting that onto WCS. //Then get the angle on plane of that new projected vector. Vector3d vec = brMat.CoordinateSystem3d.Xaxis; Vector3d vecTrans = vec.TransformBy(mat); Plane worldPlane = new Plane(Point3d.Origin, Vector3d.ZAxis); double angleOnPlane = vecTrans.AngleOnPlane(worldPlane); //double angleOnPlaneDeg = angleOnPlane * 57.2958; ar.Rotation = originalRotsAR[count] + angleOnPlane; count++; } } }

I 've tried this but then the text moves away from the block but it is on the correct plane facing up

Re: AutoCAD BlockReference with Attribute Reference - Rotate Attribute Reference to TOP View

rberghLJ4SA — Fri, 07 Oct 2022 13:34:17 GMT

afterbefore