Nevron Open Vision Documentation
Connector Splitting

NOV Diagram supports automatic connector splitting when the user drops a 2D shape over a 1D shape.

Overview

Connector splitting is enabled by default and works in the following way:

  1. The user moves a 2D shape (the circle in the image below) over a connector.
  2. The connector is highlighted to inform the user that it will get split if he or she drops the 2D shape over it.

  3. The user drops the shape over the connector.
  4. The connector gets split to 2 connectors by the dropped shape.

Enable/Disable Connector Splitting

You can enable or disable connector splitting in several ways:

  1. To enable/disable connector splitting for the whole page use the Enable1DShapeSplitting property of the page interactor:

    Disable connector splitting for the whole page
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    page.Interaction.Enable1DShapeSplitting = false;
    
  2. To enalble/disable connector splitting for a specific connector, use its Splittable property:

    Disable splitting of a specific connector
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    connector.Splittable = false;
    
  3. To enable/disable a 2D shape from splitting connectors, use its CanSplit property:

    Disable a 2D shape from splitting connectors
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    shape.CanSplit = false;
    
Splitting Connectors Programmatically

To split a connector programmatically you can use the Split method of NShape and pass a 2D shape to split the connector with. The split operation will succeed only if the connector is added to a page, its Splittable property it true and the CanSplit property of the passed 2D shape is true.

The following is an example of a connector split with a 2D shape (the small circle at the middle of the connector):

 

The sample diagram above is created with the following piece of code (the connector splitting is the second to last line of code):

Connector splitting
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NPage page = drawingView.ActivePage;
NBasicShapeFactory factory = new NBasicShapeFactory();

// Create the first shape
NShape shape1 = factory.CreateShape(ENBasicShape.Rectangle);
shape1.SetBounds(100, 100, 150, 100);
shape1.Geometry.Fill = new NColorFill(NColor.Red);
page.Items.Add(shape1);

shape1.Ports.Clear();
NPort port1 = new NPort(1, 0.5, true);
port1.SetDirection(ENBoxDirection.Right);
shape1.Ports.Add(port1);

// Create the second shape
NShape shape2 = factory.CreateShape(ENBasicShape.Circle);
shape2.SetBounds(350, 300, 150, 100);
shape2.Geometry.Fill = new NColorFill(NColor.Green);
page.Items.Add(shape2);
shape2.Ports.Clear();
NPort port2 = new NPort(0, 0.5, true);
port2.SetDirection(ENBoxDirection.Left);
shape2.Ports.Add(port2);

// Connect the shapes with a routable connector
NRoutableConnector connector = new NRoutableConnector();
connector.RerouteMode = ENRoutableConnectorRerouteMode.WhenNeeded;
connector.UserClass = NDR.StyleSheetNameConnectors;
page.Items.Add(connector);
connector.GlueBeginToPort(port1);
connector.GlueEndToPort(port2);

// Evaluate the drawing document to calculate coordinates
drawingView.Document.Evaluate();

// Get the middle point of the middle segment of the connector
int segmentCount = connector.Model.SegmentsCount;
NPoint middlePoint = connector.Model.GetSegmentMidPoint(segmentCount / 2);

// Create a 2D shape for split shape and place it at the connector middle point
NShape splitShape = new NShape();
splitShape.SetPinPoint(middlePoint);
{
    // Set shape geometry and size.
    // Remove the following 3 lines of code to get an invisible 2D shape.
    splitShape.Geometry.AddRelative(new NDrawEllipse(0, 0, 1, 1));
    splitShape.Width = 20;
    splitShape.Height = 20;
}
page.Items.Add(splitShape);

// Split the connector with the split shape
NRoutableConnector newConnector = (NRoutableConnector)connector.Split(splitShape);

// Make the new connector orange
newConnector.Geometry.Stroke = new NStroke(1, NColor.Orange);
See Also
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