Hi Stoyan,

1. It seems weird that Anchoring.Keep changes the anchor points, but now at least I know it .
3. & 4. That was the problem. I got the jumping problem almost solved using LinkValidationEventArgs directly.

I also had to use e.ChangingOrigin & e.ChangingDestination to set linkX.

A) You suggested me that I don't use e.ChangingOrigin before... Is this advice still valid? If so, what can I use instead?

B) There is still a problem. When I create a link from the left anchor point, everything is fine. There is no jump possible to the right one as it should.
However, when I create a link from the right anchor point, it immediately jumps to the left one. Of course, after that my code prevents it from going back to the right anchorPt. Why can't my code catch the first jump and how can I fix this? There is no problem in regards to destination points.

Thanks a lot!
Marie

N.B. This is the code I've got so far:

void diagram_ValidateAnchorPoint(object sender, LinkValidationEventArgs e)
{
    try
    {
        TableNode node = e.Node as TableNode;
        AnchorPoint originAnchorPt = node.Rows[e.TableRow].AnchorPattern.Points[e.AnchorIndex];

        float linkX;
        if (e.ChangingOrigin)
            linkX = e.Link.ControlPoints[0].X;
        else if (e.ChangingDestination)
        {
            PointCollection ptColl = e.Link.ControlPoints;
            linkX = ptColl[ptColl.Count - 1].X;
        }
        else
            return;
        float nodeMiddleHorizontalPt = node.Bounds.Width / 2 + node.Bounds.X;

        if ((int)originAnchorPt.Tag == ANCHOR_LEFT && linkX > nodeMiddleHorizontalPt)
            e.Cancel = true;
        else if ((int)originAnchorPt.Tag == ANCHOR_RIGHT && linkX < nodeMiddleHorizontalPt)
            e.Cancel = true;
    }
    catch (System.Exception) { }
} 

Hi Stoyan,

This doesn't work. I'm guessing it is because e.MousePosition always represents the end of the arrow being drawn and that it doesn't have anything to do with the start anchor point position.

A) Using ChangingOrigin/destination seems to work...
B) Anything else I should try for B)? Could it be somehow caused by A)?

Thanks,
Marie

Hi Stoyan,

When I use your code, the jumping problem is not solved (it's the same than when there is no validateAnchorPoint code at all), probably because I'm using the mouse position most of the times. This corresponds to the link's end when I should be using the link's beginning (just talking about the link's origin that jumps from an anchor point to another according to the mouse's position).

If you think that those new arguments will solve my last problem (no more jumping except for the right anchor point that jumps to the left one for some reason right when I start drawing a link), then I think I'll wait .

Thanks a lot!
Marie

Hi Stoyan!

That was it ! Reversing the tests worked.

I now have

float linkX;
PointCollection ptColl = e.Link.ControlPoints;
if (e.ChangingOrigin)
{
    PointF pt = ptColl[0];
    if (pt == PointF.Empty)
        linkX = e.MousePosition.X;
    else
        linkX = pt.X;
}
else if (e.ChangingDestination)
{
    PointF pt = ptColl[ptColl.Count - 1];
    if (pt == PointF.Empty)
        linkX = e.MousePosition.X;
    else
        linkX = pt.X;
}
else
    return; 

Thanks a lot for your help & patience
Marie