Bezier Segments in Blazor Diagram Component

12 Nov 20246 minutes to read

How to edit bezier segments based on bezier connector settings

The intermediate point of two adjacent bezier segments can be edited interactively using the BezierConnectorSettings.SegmentEditOrientation property of the Connector class.

SegmentEditOrientation value	Description	Output
Bidirectional	Allows the intermediate points to be dragged in either vertical or horizontal directions.
Freeform	Allows the intermediate points to be dragged in any direction.

The following code illustrates how to interact with Bezier efficiently by using the BezierConnectorSettings.Smoothness and BezierConnectorSettings.SegmentEditOrientation properties of the Connector class.

@using Syncfusion.Blazor.Diagram

<SfDiagramComponent Width="1000px" Height="500px" Nodes="@nodes" Connectors="@connectors"></SfDiagramComponent>

@code {
    //Define the diagram's connector collection.
    DiagramObjectCollection<Connector> connectors = new DiagramObjectCollection<Connector>();
    //Define the diagram's node collection.
    DiagramObjectCollection<Node> nodes = new DiagramObjectCollection<Node>();

    protected override void OnInitialized()
    {
        nodes.Add(
            new Node()
                {
                    ID = "node1",
                    OffsetX = 300,
                    OffsetY = 100,
                    Width = 100,
                    Height = 100,
                    Ports = new DiagramObjectCollection<PointPort>()
                    {
                    new PointPort()
                    {
                        ID="Port1",
                        Visibility = PortVisibility.Visible,
                        Offset = new DiagramPoint() { X = 1, Y = 0.5 },
                    },
                    }
                });
        nodes.Add(new Node()
            {
                ID = "node2",
                OffsetX = 300,
                OffsetY = 350,
                Width = 100,
                Height = 100,
                Ports = new DiagramObjectCollection<PointPort>()
                {
                    new PointPort()
                    {
                        ID="Port1",
                        Visibility = PortVisibility.Visible,
                        Offset = new DiagramPoint() { X = 0, Y = 0.5 },
                    },
                }
            });
        Connector connector1 = new Connector()
            {
                ID = "connector1",
                SourceID = "node1",
                TargetID = "node2",
                SourcePortID = "Port1",
                TargetPortID = "Port1",
                Type = ConnectorSegmentType.Bezier,
                BezierConnectorSettings = new BezierConnectorSettings() 
                { 
                    //Define the smoothness for a bezier connector.
                    Smoothness = BezierSmoothness.SymmetricAngle,
                    //Define the orientation of the segment editing controls.
                    SegmentEditOrientation = BezierSegmentEditOrientation.FreeForm
                },
                Constraints = ConnectorConstraints.Default | ConnectorConstraints.DragSegmentThumb
            };
        connectors.Add(connector1);
    }
}

You can download a complete working sample from GitHub.