topic Unable to change Point3d value in .NET Forum

Unable to change Point3d value

mhillis — Thu, 04 Jun 2015 13:30:43 GMT

Good morning,

I have multiple 3D objects that I'm trying to change the Location.Z value for. Unfortuantely, in this paticular situation I cannot seem to get the location value to change. When I do use this exact method when handling one object at a time, it works, but it won't for multiple objects.

Basically, everytime the user moves their cursor and changes the point, we activate the PointMonitorListener to get the current point where their cursor resides along the Z axis. Once we get that point, we go through and update the preview for each object that we have selected to modify.

The issue is when we get to hangerItem.Location = new Point3d(). I cannot get that value to change for the Location.Z axis.

I hope this is clear enough to understand, if there are any questions I will be monitoring this thread.

Thanks!

   public void PointMonitorListener(object sender, PointMonitorEventArgs e)
        {
            // Get the point
            Point3d pt = e.Context.ComputedPoint;
            // Update our graphics and the current point
            for (int i = 0; i < PartUtils.partList.Count; i++)
            {
                UpdateTransGraphics(PartUtils.partList[i], pt);
            }
        }

        public void UpdateTransGraphics(Part3d hangerItem, Point3d pt)
        {
            jigType = JigType.MoveLower;
            Hanger hanger = null;
            Part3d newHangerItem;

            switch (jigType)
            {
              
                case JigType.MoveLower:
                    {
                        if (double.IsNaN(pt.Z))
                        {
                            break;
                        }

                        double dz = pt.Z - hangerItem.Location.Z;

                        hangerItem.Location = new Point3d(
                            hangerItem.Location.X,
                            hangerItem.Location.Y,
                            hangerItem.Location.Z + dz);

                     
                        hanger = (Hanger)newHangerItem;

                        // Find the lowest Z value among the lower attachment locations
                        double minZ = double.MaxValue;
                        foreach (Part3d lower in hanger.Lowers)
                        {
                            if (lower.TopLocation.Z < minZ)
                            {
                                minZ = lower.TopLocation.Z;
                            }
                        }

                        // Recalculate the hanger arm lengths
                        foreach (Part3d arm in hanger.Arms)
                        {
                            Point3d endPt = arm.Location + (arm.Direction * arm.Length);
                            endPt = new Point3d(endPt.X, endPt.Y, minZ);
                            Vector3d lenVec = arm.Location.GetVectorTo(endPt);
                            if (lenVec.Length > arm.MinLength)
                            {
                                arm.Length = lenVec.Length;
                            }
                        }

                        break;
                    }
                

            if (solid != null && !solid.IsDisposed)
            {
                TransientManager.CurrentTransientManager.EraseTransient(solid, new IntegerCollection());
                solid.Dispose();
            }
            solid = hanger.CreateSolidPreview();
            TransientManager.CurrentTransientManager.AddTransient(solid, TransientDrawingMode.DirectShortTerm, 128, new IntegerCollection());
        }

Re: Unable to change Point3d value

augusto.goncalves — Fri, 05 Jun 2015 19:37:05 GMT

I'm not sure which API is this, more specifically the Part3d object. Can you clarify?

Re: Unable to change Point3d value

mhillis — Fri, 05 Jun 2015 20:10:04 GMT

I apologize for not clarifying that, the Part3d is a class we created for our objects. It inherits the standard AutoCAD API Point3d value for it's location type. Which is where I'm having the issue changing.

Re: Unable to change Point3d value

Anonymous — Fri, 05 Jun 2015 20:22:14 GMT

appears that you want to modify Solid3d's - if so, what displacement matrix are you applying to each of the solids?

for example, to change the z' location of a solid, one can pass a vector in example:

var location = new Vector3d(0, 0, 96.0);

var displacement = Matrix3d.Displacement(location);

solid.TransformBy(displacement);

hth.-

Re: Unable to change Point3d value

augusto.goncalves — Fri, 05 Jun 2015 20:23:14 GMT

Thanks for that.

Note the Point3d class in AutoCAD API is immutable, therefore you cannot change it, only assign a new value. So you need to assign a new Point3d.

Hope this is what you need.

Re: Unable to change Point3d value

5thSth — Sun, 07 Jun 2015 15:29:59 GMT

^just to clarify since its common issue for us beginner programmers (had the same problem when I started)

this does not work:

obj.Point3d.X =5;
obj.Point3d.Y=5;

.X; .Y; .Z values are reserved and can not be changed. But you can change the "point" - their "parent" object; like this:

to change the point value;

//FIRST CREATE TEMPORARY POINT WITH DESIRED VALUES
point3d tempPoint = new Point3d(5,5,0);
//REPLACE THE OLD POINT WITH NEW ONE
obj.Point3d = tempPoint;

Re: Unable to change Point3d value

mhillis — Tue, 09 Jun 2015 18:20:25 GMT

I tried creating a new value and then assigning it to the old point as 5thSth described, but unfortunately, that did not work.