Styjun

I want to animate a ModelVisual3D but I cannot detect when the parent object's frame of reference has changed.

I have a class FrameOfReference which is a 3D coordinate frame using ZYX Euler angles to describe the orientation. This class has a TransformGroup property that reflects the frame's position that gets updated whenever X,Y,Z,A,B, or C is changed. It is very important to me that I interact with the ZYX Euler angles to create transformations, and not a TransformGroup.

I also have a class EOAT ("end of arm tool"), which has properties FrameOfReference and ModelVisual3D. I am trying to get the ModelVisual3D to update if a property of the FrameOfReference has changed.

public class FrameOfReference

 private double _x, _y, _z, _a, _b, _c, _legLength;
 private ModelVisual3D _model;
 private Transform3DGroup _transformGroup;

 public FrameOfReference()
 
 _x = 0;
 _y = 0;
 _z = 0;
 _a = 0;
 _b = 0;
 _c = 0;
 

 public double X
 
 get return _x; 
 set _x = value; UpdateTransformGroup();
 

 public double Y
 
 get return _y; 
 set 
 _y = value; UpdateTransformGroup();
 

 public double Z
 
 get return _z; 
 set _z = value; UpdateTransformGroup();
 

 public double A
 
 get return _a; 
 set _a = value; UpdateTransformGroup();
 

 public double B
 
 get return _b; 
 set _b = value; UpdateTransformGroup();
 

 public double C
 
 get return _c; 
 set _c = value; UpdateTransformGroup();
 
 public void Transform3DGroup UpdateTransformGroup()
 
 //convert ZYX Euler angles into a transformgroup
 Transform3DGroup group = new Transform3DGroup();
 Vector3D e = new Vector3D(C, B, A);
 Quaternion q = new Quaternion(new Vector3D(0.0, 0.0, 1.0), e.Z)
 * new Quaternion(new Vector3D(0.0, 1.0, 0.0), e.Y)
 * new Quaternion(new Vector3D(1.0, 0.0, 0.0), e.X);
 AxisAngleRotation3D r = new AxisAngleRotation3D(q.Axis, q.Angle);
 group.Children.Add(new RotateTransform3D(r));
 group.Children.Add(new TranslateTransform3D(X, Y, Z));
 _transformGroup = group;
 
 public Transform3DGroup TransformGroup
 
 get
 return _transformGroup;
 set _transformGroup = value;

 

and my class that is the EOAT and contains the ModelVisual3D and FrameOfReference

class EOATModel


 private FrameOfReference _frame;
 private ModelVisual3D _model;

 public EOATModel()
 
 Frame = new FrameOfReference();
 

 public EOATModel(FrameOfReference Frame)
 
 this.Frame = Frame;
 

 public FrameOfReference Frame
 
 get
 
 return _frame;
 
 set
 
 _frame = value;
 CreateModel();
 
 

 public ModelVisual3D Model
 
 get
 
 return _model;
 
 set
 
 _model = value;
 
 

 public void CreateModel()
 
 if (_model != null)
 
 //--a bunch of code that makes the EOAT since its irrelevant--

 _model.Children.Add(EOATCube);
 _model.Transform = Frame.TransformGroup;
 
 

Some sample code showing how I make the _eoat.

public class Main

 EOAT _eoat = new EOAT()
 _eoat.Frame.X = 100;
 _eoat.Frame.Y = 100;
 _eoat.Frame.Z = 100;
 _eoat.Frame.A = 100;
 _eoat.Frame.B = 100;
 _eoat.Frame.C = 100;
 _eoat.Model = new ModelVisual3D();
 viewPort3d.Children.Add(_eoat.Model);
 _eoat.Frame.C = 45;

If I enter "_eoat.Frame.C = 45", the FrameOfReference inside _eoat does not detect that the frame has been changed and therefore does not update the model with CreateModel(). I know I could just manually call CreateModel() after I change the frame, but this won't work when it comes time to do animation storyboard stuff, since the animation simply changes a value over time and cannot call CreateModel() during the animation.

In short, how do I get EOAT to automatically call CreateModel() whenever anything inside Frame is changed. I have tried INotifyPropertyChange code, but haven't gotten any of it to work.

Sorry about all the content. I hope this question makes sense. Thank you.

You can simply add an event handler to the NotifyPropertyChanged event of FrameOfReference and call CreateModel from the event handler.

public EOATModel()

 Frame = new FrameOfReference();
 Frame.PropertyChanged += (o,e) => CreateModel());