Linking

[Rob]

Hi,

Could you help me determine how to link two ports dynamically such that all the user has to do is
a) click port a
b) click port b
c) link appears

I don't want to have to select a link tool prior to this, as per your included examaples. I'll be adding checking into this to ensure that the two ports are "compatible" so any hints on a efficient way to do this would be very much appreciated!

Thanks for your help
Rob

[Anonymous]

ps...

It'd also be nice to have the blinking line indicating a link is taking place with the above example...

kind regards
Rob

[Anonymous]

ps...

It'd also be nice to have the blinking line indicating a link is taking place with the above example...

kind regards
Rob

[J.Nagarajan]

Hi Rob,

If your intention is to add a link dynamically then you can use LinkCmd class. Please refer to the following code snippet

LinkCmd linkcmd = new LinkCmd();
Link link = new Link(Link.Shapes.OrthogonalLine);
link.EndPoints.LastEndPointDecorator = new EndPointDecorator(EndPointVisuals.ClosedArrow);
link.EndPoints.LastEndPointDecorator.FillStyle.Color = Color.Black;
linkcmd.SourcePort = rectangle.CenterPort;
linkcmd.TargetPort = roundrect.CenterPort;
linkcmd.Link = link;
this.diagram1.Controller.ExecuteCommand(linkcmd);

Please refer to the attached sample. In this sample when you click on the "Add Symbols" button you can get 2 symbols on the diagram and click on the "AddLink" button to create a link between these two symbols.

We are currently working on to create the link as a blinking line. We will update you at the earliest.

Regards,
Nagaraj

Dynamic Link.zip

[Administrator]

I saw your post and thought I'd share with you how we did this in our application. We have a large app with derived model, diagram and controller classes. We also have custom symbols and links. We used the following override in our controller class to do a "hit test" for a port to activate the link tool. It makes the step of activating the link tool look seamless to the user.

protected override void OnMouseDown(object sender, MouseEventArgs evtArgs)
{
if (evtArgs.Button == MouseButtons.Left)
{
// Check to see if there is a port at this location
Port port = this.View.GetPortAt(new Point evtArgs.X, evtArgs.Y), 0);

// Activate the link tool if there is a port and it is valid
if (port != null)
{
if (port.GetType() == typeof(CirclePort))
{
this.ActivateTool("LinkTool");
}
}
}

base.OnMouseDown(sender, evtArgs);
}

(We're still using 4.1, with no plans to upgrade in the near future.)

Chris C.


>Hi,

Could you help me determine how to link two ports dynamically such that all the user has to do is
a) click port a
b) click port b
c) link appears

I don't want to have to select a link tool prior to this, as per your included examaples. I'll be adding checking into this to ensure that the two ports are "compatible" so any hints on a efficient way to do this would be very much appreciated!

Thanks for your help
Rob

[J.Nagarajan]

Hi Chris ,

We regret for the inconvenience caused. I have tested this issue in v.4.1.0.52 . I am afraid, I was not able to reproduce this issue. I have attached my test sample.

CustomOrthogonalLink_Sample.zip

Could you please check the sample and let me know whether you are able to reproduce the issue in this sample?. It would be helpful if you provide a sample or modify the sample attached to reproduce this issue.It will help us to resolve it as early as possible.

Thanks for using Essential Diagram.

Regards,
J.Nagaraj