Edit Bezier curve

Question

I need to edit a Bézier curve Element with a text along it and I wonder if there is any sketch class or command like the ArcMap´s Edit vertices command. I have tried with a BezierMovePointFeedbackClass but the Start method needs a vertex index like parameter and I can get only the first vertex of the curve with a HitTest object.

Any ideas???

Thanks in advance!

VictorAparicio · Answer

Well, finally I could not edit the Bézier curve with the IElementEditVertices and the ISelectionTracker classes, so I have to develope my custom edit class. 
I have drawn every control vertex and every tangent line of the curve and then capture the mouse down position with a IHitTest class. Then, with the point and the index of the vertex, I have used a BezierMovePointFeedbackClass to help the user edit the curve.

LukeBadgerow · Answer

We dont get many questions on this so can you give us some more information on what types of edits you want to do here.
Thanks[/QUOTE wrote:

I don't want to hijack your thread, but when I update the geometry of my annotation, I'm losing my actual annotation (the text component).  The method below is what I'm implementing here:        private void ExperimentalMethod(int objectid, IFeatureLayer newlayer, IFeatureLayer existinglayer) {
            IFeature newfeature = newlayer.FeatureClass.GetFeature(objectid);
            IFeature existingfeature = FindNearestAnnotation(newfeature, existinglayer);
            IGeometry existinggeometry = existingfeature.Shape;
            IAnnotationFeature annofeat = (IAnnotationFeature)newfeature;
            
            IElement element = annofeat.Annotation;
            element.Activate(ArcMap.Document.ActiveView.ScreenDisplay);
            element.Geometry = existinggeometry;
            
            ITextElement textelement = (ITextElement)element;
            ITextSymbol symbol = textelement.Symbol;
            
            symbol.Angle = (double)existingfeature.get_Value(
                existingfeature.Fields.FindField("Angle"));

symbol.Text = newfeature.get_Value(
                newfeature.Fields.FindField("TextString")).ToString();

textelement.Symbol = symbol;
            annofeat.Annotation = (IElement)textelement;
            newfeature = (IFeature)annofeat;
            newfeature.Store();

}

VictorAparicio · Answer

Thanks for your answer Sean. I´m developing an application in ArcGIS Engine 9.3.1 and I have to allow the user to draw figures over maps and then modify them. The figures can be any annotation the user want to show in a map (points, polylines, polygons, text and polylines with text along it), for example a forest fire, an accident, etc.

I cannot use the Editor, because it is a desktop object, but thanks to your post I realized I can use IElementVertices and ISelectionTracker. Unfortunately it doesn´t work (I don´t know why because with polylines works perfectly) with Bezier curves as my text with polyline is...

My code is like this:

public override void OnClick()
        {
            try
            {
                m_HitElement = ((IGraphicsContainerSelect)AxMapControl1.Map).SelectedElement(0);
                if (m_HitElement is IGroupElement)
                {
                    m_EditVertices = (IElementEditVertices) IGroupElement)m_HitElement).get_Element(0);
                }
                else
                {
                    m_EditVertices = (IElementEditVertices)m_HitElement;
                }
                m_HitElement.Activate((IDisplay)AxMapControl1.ActiveView.ScreenDisplay);
                m_EditVertices.MovingVertices = true;
                m_SelectionTracker = m_EditVertices.GetMoveVerticesSelectionTracker();
                m_SelectionTracker.Display = AxMapControl1.ActiveView.ScreenDisplay;
                m_SelectionTracker.ShowHandles = true;
                AxMapControl1.ActiveView.Refresh();
            }
            catch (Exception Err)
            {
                
            }
        }

public override void OnMouseUp(int Button, int Shift, int X, int Y)
        {
            try
            {
                m_SelectionTracker.OnMouseUp(Button, Shift, X, Y);
                m_HitElement.Geometry = m_SelectionTracker.Geometry;

AxMapControl1.ActiveView.GraphicsContainer.UpdateElement(m_HitElement);
                AxMapControl1.ActiveView.Refresh();
            }
            catch (Exception Err)
            {
                
            }
        }

Thanks again

Víctor Aparicio