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Connector in ASP.NET Core Diagram control

17 Sep 2021 / 10 minutes to read

Connectors are objects used to create link between two points, nodes or ports to represent the relationships between them.

Create connector

Connector can be created by defining the source and target point of the connector. The path to be drawn can be defined with a collection of segments. To explore the properties of a connector, refer to Connector Properties.

Add connectors through connectors collection

The sourcePoint and targetPoint properties of connector allow you to define the end points of a connector.

The following code example illustrates how to add a connector through connector collection.

tagHelper

default.cs

<ejs-diagram id="container" width="100%" height="700px" connectors="@ViewBag.connectors" nodes="@ViewBag.nodes">
</ejs-diagram>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Syncfusion.EJ2.Diagrams;
using System.Drawing;

namespace EJ2MVCSampleBrowser.Controllers.Diagram {
    public partial class DiagramController: Controller {
        // GET: Nodes
        public ActionResult Nodes() {

            List<DiagramConnector> Connectors = new List<DiagramConnector>();
            Connectors.Add(new DiagramConnector() { Id = "connector", SourcePoint = new DiagramPoint() { X = 100, Y = 100 }, TargetPoint = new DiagramPoint() { X = 300, Y = 300 }  });
            ViewBag.connectors = Connectors;


            return View();
        }
    }
}

Add connector at runtime

Connectors can be added at runtime by using public method, diagram.add and can be removed at runtime by using public method, diagram.remove.

The following code example illustrates how to add connector at runtime.

tagHelper

default.cs

<ejs-diagram id="container" width="100%" height="700px" connectors="@ViewBag.connectors" nodes="@ViewBag.nodes">
</ejs-diagram>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Syncfusion.EJ2.Diagrams;
using System.Drawing;

namespace EJ2MVCSampleBrowser.Controllers.Diagram {
    public partial class DiagramController: Controller {
        // GET: Nodes
        public ActionResult Nodes() {

            List<DiagramConnector> Connectors = new List<DiagramConnector>();
            Connectors.Add(new DiagramConnector() { Id = "connector", SourcePoint = new DiagramPoint() { X = 100, Y = 100 }, TargetPoint = new DiagramPoint() { X = 300, Y = 300 }  });
            ViewBag.connectors = Connectors;


            return View();
        }
    }
}

var connectors = {
    id: "connector2",
    style: {
        strokeColor: '#6BA5D7',
        fill: '#6BA5D7',
        strokeWidth: 2
    },
    targetDecorator: {
        style: {
            fill: '#6BA5D7',
            strokeColor: '#6BA5D7'
        }
    },
    sourcePoint: {
        x: 300,
        y: 100
    },
    targetPoint: {
        x: 400,
        y: 200
    }
}

var diagram = document.getElementById("container").ej2_instances[0];
// Adds to the Diagram
diagram.add(connectors)
// Remove from the diagram
diagram.remove(connectors)

Connectors from palette

Connectors can be predefined and added to the symbol palette. You can drop those connectors into the diagram, when required.

For more information about adding connectors from symbol palette, refer to Symbol Palette.

Draw connectors

Connectors can be interactively drawn by clicking and dragging on the diagram surface by using drawingObject.

For more information about drawing connectors, refer to Draw Connectors.

Update connector at runtime

Various connector properties such as sourcePoint, targetPoint, style, sourcePortID, targetPortID, etc., can be updated at the runtime.

The following code example illustrates how to update a connector’s source point, target point, styles properties at runtime.

tagHelper

default.cs

<ejs-diagram id="container" width="100%" height="700px" connectors="@ViewBag.connectors" nodes="@ViewBag.nodes">
</ejs-diagram>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Syncfusion.EJ2.Diagrams;
using System.Drawing;

namespace EJ2MVCSampleBrowser.Controllers.Diagram {
    public partial class DiagramController: Controller {
        // GET: Nodes
        public ActionResult Nodes() {

            List<DiagramConnector> Connectors = new List<DiagramConnector>();
            Connectors.Add(new DiagramConnector() { Id = "connector", SourcePoint = new DiagramPoint() { X = 100, Y = 100 }, TargetPoint = new DiagramPoint() { X = 300, Y = 300 }  });
            ViewBag.connectors = Connectors;


            return View();
        }
    }
}

var diagram = document.getElementById("container").ej2_instances[0];
// Update the connector properties at the run time
diagram.connectors[0].style.strokeColor = '#6BA5D7';
diagram.connectors[0].style.fill = '#6BA5D7';
diagram.connectors[0].style.strokeWidth = 2;
diagram.connectors[0].targetDecorator.style.fill = '#6BA5D7';
diagram.connectors[0].targetDecorator.style.strokeColor = '#6BA5D7';
diagram.connectors[0].sourcePoint.x = 150;
diagram.connectors[0].targetPoint.x = 150;
diagram.dataBind();

Connect nodes

The sourceID and targetID properties allow to define the nodes to be connected.
The following code example illustrates how to connect two nodes.

tagHelper

connect.cs

<ejs-diagram id="container" width="100%" height="700px" connectors="@ViewBag.connectors" nodes="@ViewBag.nodes">
</ejs-diagram>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Syncfusion.EJ2.Diagrams;
using System.Drawing;

namespace EJ2MVCSampleBrowser.Controllers.Diagram {
    public partial class DiagramController: Controller {
        // GET: Nodes
        public ActionResult Nodes() {

            List < DiagramNode > nodes = new List < DiagramNode > ();
            List < DiagramNodeAnnotation > Node1 = new List < DiagramNodeAnnotation > ();
            Node1.Add(new DiagramNodeAnnotation() {
                Content = "node1", Style = new DiagramTextStyle() {
                    Color = "White", StrokeColor = "None"
                }
            });
            List < DiagramNodeAnnotation > Node2 = new List < DiagramNodeAnnotation > ();
            Node2.Add(new DiagramNodeAnnotation() {
                Content = "node2", Style = new DiagramTextStyle() {
                    Color = "White", StrokeColor = "None"
                }
            });
            nodes.Add(new DiagramNode() {
                Id = "node1",
                    Width = 100,
                    Height = 100,
                    Style = new NodeStyleNodes() {
                        Fill = "darkcyan"
                    },
                    OffsetX = 100,
                    OffsetY = 100,
                    Annotations = Node1
            });
           nodes.Add(new DiagramNode() {
                Id = "node2",
                    Width = 100,
                    Height = 100,
                    Style = new NodeStyleNodes() {
                        Fill = "darkcyan"
                    },
                    OffsetX = 300,
                    OffsetY = 300,
                    Annotations = Node2
            });
            ViewBag.nodes = nodes;

            List<DiagramConnector> Connectors = new List<DiagramConnector>();
            Connectors.Add(new DiagramConnector() { Id = "connector", SourceID="node1", TargetID="node2"  });
            ViewBag.connectors = Connectors;


            return View();
        }
    }
}

When you remove NodeConstraints InConnect from Default, the node accepts only an outgoing connection to dock in it. Similarly, when you remove NodeConstraints OutConnect from Default, the node accepts only an incoming connection to dock in it.
When you remove both InConnect and OutConnect NodeConstraints from Default, the node restricts connector to establish connection in it.
The following code illustrates how to disable InConnect constraints.

node.constraints =  NodeConstraints.Default & ~NodeConstraints.InConnect,

Connections with ports

The sourcePortID and targetPortID properties allow to create connections between some specific points of source/target nodes. The following code example illustrates how to create port to port connections.

tagHelper

ports.cs

<ejs-diagram id="container" width="100%" height="700px" connectors="@ViewBag.connectors" nodes="@ViewBag.nodes">
</ejs-diagram>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Syncfusion.EJ2.Diagrams;
using System.Drawing;

namespace EJ2MVCSampleBrowser.Controllers.Diagram {
    public partial class DiagramController: Controller {
        // GET: Nodes
        public ActionResult Nodes() {

            List < DiagramNode > nodes = new List < DiagramNode > ();
            List < DiagramNodeAnnotation > Node1 = new List < DiagramNodeAnnotation > ();
            Node1.Add(new DiagramNodeAnnotation() {
                Content = "node1", Style = new DiagramTextStyle() {
                    Color = "White", StrokeColor = "None"
                }
            });
            List < DiagramNodeAnnotation > Node2 = new List < DiagramNodeAnnotation > ();
            Node2.Add(new DiagramNodeAnnotation() {
                Content = "node2", Style = new DiagramTextStyle() {
                    Color = "White", StrokeColor = "None"
                }
            });
            List<DiagramPort> ports1 = new List<DiagramPort>();
            ports1.Add(new CustomPort() { Id = "port1", Shape = PortShapes.Circle, Offset = new DiagramPoint() { X = 1, Y = 0.5 }, Visibility = PortVisibility.Visible });
            List<DiagramPort> ports2 = new List<DiagramPort>();
            ports2.Add(new CustomPort() { Id = "port2", Shape = PortShapes.Circle, Offset = new DiagramPoint() { X = 0, Y = 0.5 }, Visibility = PortVisibility.Visible });
            nodes.Add(new DiagramNode() {
                Id = "node1",
                    Width = 100,
                    Height = 100,
                    Style = new NodeStyleNodes() {
                        Fill = "darkcyan"
                    },
                    OffsetX = 100,
                    OffsetY = 100,
                    Annotations = Node1,
                    Ports = ports1
            });
           nodes.Add(new DiagramNode() {
                Id = "node2",
                    Width = 100,
                    Height = 100,
                    Style = new NodeStyleNodes() {
                        Fill = "darkcyan"
                    },
                    OffsetX = 300,
                    OffsetY = 300,
                    Annotations = Node2,
                    Ports = port2
            });
            ViewBag.nodes = nodes;

            List<DiagramConnector> Connectors = new List<DiagramConnector>();
            Connectors.Add(new DiagramConnector() { Id = "connector", SourceID="node1", TargetID="node2", SourcePortID = "port1", TargetPortID = "port2"  });
            ViewBag.connectors = Connectors;


            return View();
        }
    }
}

Similarly, the sourcePortID or targetPortID can be changed at the runtime by changing the port sourcePortID or targetPortID.

tagHelper

ports.cs

<ejs-diagram id="container" width="100%" height="700px" connectors="@ViewBag.connectors" nodes="@ViewBag.nodes">
</ejs-diagram>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Syncfusion.EJ2.Diagrams;
using System.Drawing;

namespace EJ2MVCSampleBrowser.Controllers.Diagram {
    public partial class DiagramController: Controller {
        // GET: Nodes
        public ActionResult Nodes() {

            List < DiagramNode > nodes = new List < DiagramNode > ();
            List < DiagramNodeAnnotation > Node1 = new List < DiagramNodeAnnotation > ();
            Node1.Add(new DiagramNodeAnnotation() {
                Content = "node1", Style = new DiagramTextStyle() {
                    Color = "White", StrokeColor = "None"
                }
            });
            List < DiagramNodeAnnotation > Node2 = new List < DiagramNodeAnnotation > ();
            Node2.Add(new DiagramNodeAnnotation() {
                Content = "node2", Style = new DiagramTextStyle() {
                    Color = "White", StrokeColor = "None"
                }
            });
            List<DiagramPort> ports1 = new List<DiagramPort>();
            ports1.Add(new CustomPort() { Id = "port1", Shape = PortShapes.Circle, Offset = new DiagramPoint() { X = 1, Y = 0.5 }, Visibility = PortVisibility.Visible });
            List<DiagramPort> ports2 = new List<DiagramPort>();
            ports2.Add(new CustomPort() { Id = "port2", Shape = PortShapes.Circle, Offset = new DiagramPoint() { X = 0, Y = 0.5 }, Visibility = PortVisibility.Visible });
            nodes.Add(new DiagramNode() {
                Id = "node1",
                    Width = 100,
                    Height = 100,
                    Style = new NodeStyleNodes() {
                        Fill = "darkcyan"
                    },
                    OffsetX = 100,
                    OffsetY = 100,
                    Annotations = Node1,
                    Ports = ports1
            });
           nodes.Add(new DiagramNode() {
                Id = "node2",
                    Width = 100,
                    Height = 100,
                    Style = new NodeStyleNodes() {
                        Fill = "darkcyan"
                    },
                    OffsetX = 300,
                    OffsetY = 300,
                    Annotations = Node2,
                    Ports = port2
            });
            ViewBag.nodes = nodes;

            List<DiagramConnector> Connectors = new List<DiagramConnector>();
            Connectors.Add(new DiagramConnector() { Id = "connector", SourceID="node1", TargetID="node2", SourcePortID = "port1", TargetPortID = "port2"  });
            ViewBag.connectors = Connectors;


            return View();
        }
    }
}

var diagram = document.getElementById("container").ej2_instances[0];
diagram.appendTo('#element');
// Update the target portID at the run time
diagram.connectors[0].targetPortID = 'newnodeport1'

When you set PortConstraints to InConnect, the port accepts only an incoming connection to dock in it. Similarly, when you set PortConstraints to OutConnect, the port accepts only an outgoing connection to dock in it.
When you set PortConstraints to None, the port restricts connector to establish connection in it.

port.constraints =  PortConstraints.InConnect,

Segments

The path of the connector is defined with a collection of segments. There are three types of segments.

Straight

To create a straight line, specify the type of the segment as straight and add a straight segment to segments collection and need to specify type for the connector. The following code example illustrates how to create a default straight segment.

The point property of straight segment allows you to define the end point of it. The following code example illustrates how to define the end point of a straight segment.

Orthogonal

Orthogonal segments is used to create segments that are perpendicular to each other.

Set the segment type as orthogonal to create a default orthogonal segment and need to specify type. The following code example illustrates how to create a default orthogonal segment.

Multiple segments can be defined one after another. To create a connector with multiple segments, define and add the segments to connector.segments collection. The following code example illustrates how to create a connector with multiple segments.

tagHelper

orthogonal.cs

<ejs-diagram id="container" width="100%" height="700px" connectors="@ViewBag.connectors">
</ejs-diagram>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Syncfusion.EJ2.Diagrams;
using System.Drawing;

namespace EJ2MVCSampleBrowser.Controllers.Diagram {
    public partial class DiagramController: Controller {
        // GET: Nodes
        public ActionResult Nodes() {

            List<DiagramConnector> Connectors = new List<DiagramConnector>();
            Connectors.Add(new DiagramConnector() { Id = "connector", SourcePoint = new DiagramPoint() { X = 100, Y = 100 }, TargetPoint = new DiagramPoint() { X = 300, Y = 300 }, Type = Segments.Orthogonal  });
            ViewBag.connectors = Connectors;


            return View();
        }
    }
}

The length and direction properties allow to define the flow and length of segment. The following code example illustrates how to create customized orthogonal segments.

tagHelper

direction.cs

<ejs-diagram id="container" width="100%" height="700px" connectors="@ViewBag.connectors">
</ejs-diagram>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Syncfusion.EJ2.Diagrams;
using System.Drawing;

namespace EJ2MVCSampleBrowser.Controllers.Diagram {
    public partial class DiagramController: Controller {
        // GET: Nodes
        public ActionResult Nodes() {

            List < DiagramConnector > Connectors = new List < DiagramConnector > ();
            Connectors.Add(new DiagramConnector() {
                Id = "connector", SourcePoint = new DiagramPoint() {
                    X = 100, Y = 100
                }, TargetPoint = new DiagramPoint() {
                    X = 300, Y = 300
                }, Type = Segments.Orthogonal, Segments = new Segments() {
                    Type = "Orthogonal",
                        Direction = "Bottom",
                        Length = 150
                }
            });
            ViewBag.connectors = Connectors;


            return View();
        }
        public class Segments {
            [DefaultValue(null)]
            [HtmlAttributeName("type")]
            [JsonProperty("type")]
            public string Type {
                get;
                set;
            }
            [DefaultValue(null)]
            [HtmlAttributeName("direction")]
            [JsonProperty("direction")]
            public string Direction {
                get;
                set;
            }
            [DefaultValue(null)]
            [HtmlAttributeName("length")]
            [JsonProperty("length")]
            public number Length {
                get;
                set;
            }
        }
    }
}

Note: You need to mention the segment type as same as what you mentioned in connector type. There should be no contradiction between connector type and segment type.

Avoid overlapping

Orthogonal segments are automatically re-routed, in order to avoid overlapping with the source and target nodes. The following preview illustrates how orthogonal segments are re-routed.

tagHelper

overlapping.cs

<ejs-diagram id="container" width="100%" height="700px" connectors="@ViewBag.connectors" nodes="@ViewBag.nodes">
</ejs-diagram>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Syncfusion.EJ2.Diagrams;
using System.Drawing;

namespace EJ2MVCSampleBrowser.Controllers.Diagram {
    public partial class DiagramController: Controller {
        // GET: Nodes
        public ActionResult Nodes() {

            List < DiagramNode > nodes = new List < DiagramNode > ();
            List < DiagramNodeAnnotation > Node1 = new List < DiagramNodeAnnotation > ();
            Node1.Add(new DiagramNodeAnnotation() {
                Content = "node1", Style = new DiagramTextStyle() {
                    Color = "White", StrokeColor = "None"
                }
            });
            List < DiagramNodeAnnotation > Node2 = new List < DiagramNodeAnnotation > ();
            Node2.Add(new DiagramNodeAnnotation() {
                Content = "node2", Style = new DiagramTextStyle() {
                    Color = "White", StrokeColor = "None"
                }
            });
            List<DiagramPort> ports1 = new List<DiagramPort>();
            ports1.Add(new CustomPort() { Id = "port1", Shape = PortShapes.Circle, Offset = new DiagramPoint() { X = 1, Y = 0.5 }, Visibility = PortVisibility.Visible });
            List<DiagramPort> ports2 = new List<DiagramPort>();
            ports2.Add(new CustomPort() { Id = "port2", Shape = PortShapes.Circle, Offset = new DiagramPoint() { X = 0, Y = 0.5 }, Visibility = PortVisibility.Visible });
            nodes.Add(new DiagramNode() {
                Id = "node1",
                    Width = 100,
                    Height = 100,
                    Style = new NodeStyleNodes() {
                        Fill = "darkcyan"
                    },
                    OffsetX = 100,
                    OffsetY = 100,
                    Annotations = Node1,
                    Ports = ports1
            });
           nodes.Add(new DiagramNode() {
                Id = "node2",
                    Width = 100,
                    Height = 100,
                    Style = new NodeStyleNodes() {
                        Fill = "darkcyan"
                    },
                    OffsetX = 300,
                    OffsetY = 300,
                    Annotations = Node2,
                    Ports = port2
            });
            ViewBag.nodes = nodes;

            List<DiagramConnector> Connectors = new List<DiagramConnector>();
            Connectors.Add(new DiagramConnector() { Id = "connector", SourceID="node1", TargetID="node2", SourcePortID = "port1", TargetPortID = "port2", Type = Segments.Orthogonal  });
            ViewBag.connectors = Connectors;


            return View();
        }
    }
}

Bezier

Bezier segments are used to create curve segments and the curves are configurable either with the control points or with vectors.

To create a bezier segment, the segment.type is set as bezier and need to specify type for the connector. The following code example illustrates how to create a default bezier segment.

tagHelper

vector.cs

<ejs-diagram id="container" width="100%" height="700px" connectors="@ViewBag.connectors">
</ejs-diagram>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Syncfusion.EJ2.Diagrams;
using System.Drawing;

namespace EJ2MVCSampleBrowser.Controllers.Diagram {
    public partial class DiagramController: Controller {
        // GET: Nodes
        public ActionResult Nodes() {
                
            List<vector> Stop = new List<vector>();
            Stop.Add(new vector() { Distance = 100,  Angle = 90 });
            Stop.Add(new vector() { Distance = 90, Angle = 270 });

            List < DiagramConnector > Connectors = new List < DiagramConnector > ();
            Connectors.Add(new DiagramConnector() {
                Id = "connector", SourcePoint = new DiagramPoint() {
                    X = 100, Y = 100
                }, TargetPoint = new DiagramPoint() {
                    X = 300, Y = 300
                }, Type = Segments.Besizer, Segments = new Segments() {
                    Type = "Besizer",
                    Vector = Stop
                }
            });
            ViewBag.connectors = Connectors;


            return View();
        }
        public class Segments {
            [DefaultValue(null)]
            [HtmlAttributeName("type")]
            [JsonProperty("type")]
            public string Type {
                get;
                set;
            }
             [DefaultValue(null)]
            [HtmlAttributeName("vectors")]
            [JsonProperty("vectors")]
            public List<vector> Vector {
                get;
                set;
            }
            
        }
      public class vector {
            [DefaultValue(null)]
            [HtmlAttributeName("distance")]
            [JsonProperty("distance")]
            public number Distance {
                get;
                set;
            }
            [DefaultValue(null)]
            [HtmlAttributeName("angle")]
            [JsonProperty("angle")]
            public number Angle {
                get;
                set;
            }
        }
    }
}

The point1 and point2 properties of bezier segment enable you to set the control points. The following code example illustrates how to configure the bezier segments with control points.

The vector1 and vector2 properties of bezier segment enable you to define the vectors. The following code illustrates how to configure a bezier curve with vectors.

tagHelper

points.cs

<ejs-diagram id="container" width="100%" height="700px" connectors="@ViewBag.connectors">
</ejs-diagram>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Syncfusion.EJ2.Diagrams;
using System.Drawing;

namespace EJ2MVCSampleBrowser.Controllers.Diagram {
    public partial class DiagramController: Controller {
        // GET: Nodes
        public ActionResult Nodes() {
                
            List<point> Stop = new List<vector>();
            Stop.Add(new point() { X = 100, Y = 100 });
            Stop.Add(new point() { X = 200, Y = 200 });

            List < DiagramConnector > Connectors = new List < DiagramConnector > ();
            Connectors.Add(new DiagramConnector() {
                Id = "connector", SourcePoint = new DiagramPoint() {
                    X = 100, Y = 100
                }, TargetPoint = new DiagramPoint() {
                    X = 300, Y = 300
                }, Type = Segments.Besizer, Segments = new Segments() {
                    Type = "Besizer",
                    Vector = Stop
                }
            });
            ViewBag.connectors = Connectors;


            return View();
        }
        public class Segments {
            [DefaultValue(null)]
            [HtmlAttributeName("type")]
            [JsonProperty("type")]
            public string Type {
                get;
                set;
            }
             [DefaultValue(null)]
            [HtmlAttributeName("points")]
            [JsonProperty("points")]
            public List<point> Point {
                get;
                set;
            }
            
        }
      public class point {
            [DefaultValue(null)]
            [HtmlAttributeName("x")]
            [JsonProperty("x")]
            public double X {
                get;
                set;
            }
            [DefaultValue(null)]
            [HtmlAttributeName("y")]
            [JsonProperty("y")]
            public double Y {
                get;
                set;
            }
        }
    }
}

Decorator

Starting and ending points of a connector can be decorated with some customizable shapes like arrows, circles, diamond, or path. The connection end points can be decorated with the sourceDecorator and targetDecorator properties of the connector.
The shape property of sourceDecorator allows to define the shape of the decorators. Similarly, the shape property of targetDecorator allows to define the shape of the decorators.
To create custom shape for source decorator, use pathData property. Similarly, to create custom shape for target decorator, use pathData property.
The following code example illustrates how to create decorators of various shapes.

tagHelper

srcdecorator.cs

<ejs-diagram id="container" width="100%" height="700px" connectors="@ViewBag.connectors">
</ejs-diagram>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Syncfusion.EJ2.Diagrams;
using System.Drawing;

namespace EJ2MVCSampleBrowser.Controllers.Diagram {
    public partial class DiagramController: Controller {
        // GET: Nodes
        public ActionResult Nodes() {

            List < DiagramConnector > Connectors = new List < DiagramConnector > ();
            Connectors.Add(new DiagramConnector() {
                Id = "connector", SourcePoint = new DiagramPoint() {
                    X = 100, Y = 100
                }, TargetPoint = new DiagramPoint() {
                    X = 300, Y = 300
                }, Type = Segments.Straight, SourceDecorator = new DiagramDecorator() {
                    Shape = DecoratorShapes.Circle, Style = new DiagramShapeStyle() {
                        StrokeColor = "Red", StrokeWidth = 3
                    }
                }, TargetDecorator = new DiagramDecorator() {
                    Shape = DecoratorShapes.Custom,
                    PathData = "M80.5,12.5 C80.5,19.127417 62.59139,24.5 40.5,24.5 C18.40861,24.5 0.5,19.127417 0.5,12.5 C0.5,5.872583 18.40861,0.5 40.5,0.5 C62.59139,0.5 80.5,5.872583 80.5,12.5 z",
                    Style = new DiagramShapeStyle() {
                        StrokeColor = "Red", StrokeWidth = 3, opacity = 0.8
                    }
                }
            });
            Connectors.Add(new DiagramConnector() {
                Id = "connector", SourcePoint = new DiagramPoint() {
                    X = 400, Y = 100
                }, TargetPoint = new DiagramPoint() {
                    X = 600, Y = 300
                }, Type = Segments.Straight, SourceDecorator = new DiagramDecorator() {
                     Shape = DecoratorShapes.IndentedArrow, Style = new DiagramShapeStyle() {
                        StrokeColor = "Blue", StrokeWidth = 3
                    }
                },
                   TargetDecorator = new DiagramDecorator() {
                     Shape = DecoratorShapes.OutdentedArrow, Style = new DiagramShapeStyle() {
                        StrokeColor = "Yellow", StrokeWidth = 3
                    }
                }
            });
            ViewBag.connectors = Connectors;


            return View();
        }
    }
}

Padding

Padding is used to leave the space between the Connector’s end point and the object to where it is connected.

The sourcePadding property of connector defines space between the source point and the source node of the connector.
The targetPadding property of connector defines space between the end point and the target node of the connector.
The following code example illustrates how to leave space between the connection end points and source and target nodes.

tagHelper

padding.cs

<ejs-diagram id="container" width="100%" height="700px" connectors="@ViewBag.connectors" nodes="@ViewBag.nodes">
</ejs-diagram>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Syncfusion.EJ2.Diagrams;
using System.Drawing;

namespace EJ2MVCSampleBrowser.Controllers.Diagram {
    public partial class DiagramController: Controller {
        // GET: Nodes
        public ActionResult Nodes() {

            List < DiagramNode > nodes = new List < DiagramNode > ();
            List < DiagramNodeAnnotation > Node1 = new List < DiagramNodeAnnotation > ();           
            nodes.Add(new DiagramNode() {
                Id = "node1",
                    Width = 100,
                    Height = 100,                   
                    OffsetX = 100,
                    OffsetY = 100,                   
            });
           nodes.Add(new DiagramNode() {
                Id = "node2",
                    Width = 100,
                    Height = 100,                    
                    OffsetX = 300,
                    OffsetY = 300,                   
            });
            ViewBag.nodes = nodes;

            List<DiagramConnector> Connectors = new List<DiagramConnector>();
            Connectors.Add(new DiagramConnector() { Id = "connector", SourceID="node1", TargetID="node2",sourcePadding =20,
            targetPadding =20 });
            ViewBag.connectors = Connectors;


            return View();
        }
    }
}

Flip

The diagram Provides support to flip the connector. The flip is performed to give the mirrored image of the original element.

The flip types are as follows:

HorizontalFlip Horizontal is used to interchange the connector source and target x points.
VerticalFlip Vertical is used to interchange the connector source and target y points.
Both Both is used to interchange the source point as target point and target point as source point

tagHelper

<ejs-diagram id="container" width="100%" height="700px" connectors="@ViewBag.connectors">
</ejs-diagram>

Note: The flip is not applicable when the connectors connect in nodes.

Bridging

Line bridging creates a bridge for lines to smartly cross over the other lines, at points of intersection. By default, bridgeDirection is set to top. Depending upon the direction given bridging direction appears. Bridging can be enabled/disabled either with the connector.constraints or diagram.constraints. The following code example illustrates how to enable line bridging.

tagHelper

bridging.cs

<ejs-diagram id="container" width="100%" height="700px" connectors="@ViewBag.connectors" nodes="@ViewBag.nodes" constraints="Default,Bridging">
</ejs-diagram>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Syncfusion.EJ2.Diagrams;
using System.Drawing;

namespace EJ2MVCSampleBrowser.Controllers.Diagram {
    public partial class DiagramController: Controller {
        // GET: Nodes
        public ActionResult Nodes() {

            List < DiagramNode > nodes = new List < DiagramNode > ();
            List < DiagramNodeAnnotation > Node1 = new List < DiagramNodeAnnotation > ();
            Node1.Add(new DiagramNodeAnnotation() {
                Content = "node1", Style = new DiagramTextStyle() {
                    Color = "White", StrokeColor = "None"
                }
            });
            List < DiagramNodeAnnotation > Node2 = new List < DiagramNodeAnnotation > ();
            Node2.Add(new DiagramNodeAnnotation() {
                Content = "node2", Style = new DiagramTextStyle() {
                    Color = "White", StrokeColor = "None"
                }
            });
            nodes.Add(new DiagramNode() {
                Id = "node1",
                    Width = 150,
                    Height = 60,
                    Style = new NodeStyleNodes() {
                        Fill = "darkcyan"
                    },
                    OffsetX = 300,
                    OffsetY = 60,
                    Annotations = Node1
            });
            nodes.Add(new DiagramNode() {
                Id = "node2",
                    Width = 150,
                    Height = 60,
                    Style = new NodeStyleNodes() {
                        Fill = "darkcyan"
                    },
                    OffsetX = 300,
                    OffsetY = 250,
                    Annotations = Node2
            });
            ViewBag.nodes = nodes;

            List < DiagramConnector > Connectors = new List < DiagramConnector > ();
            Connectors.Add(new DiagramConnector() {
                Id = "connector", SourceID = "node1", TargetID = "node2", Type = Segments.Straight
            });
            Connectors.Add(new DiagramConnector() {
                Id = "connector", SourcePoint = new DiagramPoint() {
                    X = 200, Y = 130
                }, TargetPoint = new DiagramPoint() {
                    X = 400, Y = 130
                }, Type = Segments.Straight
            });
            Connectors.Add(new DiagramConnector() {
                Id = "connector", SourcePoint = new DiagramPoint() {
                    X = 200, Y = 170
                }, TargetPoint = new DiagramPoint() {
                    X = 400, Y = 170
                }, Type = Segments.Straight
            });
            ViewBag.connectors = Connectors;


            return View();
        }
    }
}

Note: You need to inject connector bridging module into the diagram.

The bridgeSpace property of connectors can be used to define the width for line bridging.

Limitation: Bezier segments do not support bridging.

Corner radius

Corner radius allows to create connectors with rounded corners. The radius of the rounded corner is set with the cornerRadius property.

tagHelper

cornerradius.cs

<ejs-diagram id="container" width="100%" height="700px" connectors="@ViewBag.connectors" nodes="@ViewBag.nodes">
</ejs-diagram>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Syncfusion.EJ2.Diagrams;
using System.Drawing;

namespace EJ2MVCSampleBrowser.Controllers.Diagram {
    public partial class DiagramController: Controller {
        // GET: Nodes
        public ActionResult Nodes() {

            List < DiagramNode > nodes = new List < DiagramNode > ();
            List < DiagramNodeAnnotation > Node1 = new List < DiagramNodeAnnotation > ();
            Node1.Add(new DiagramNodeAnnotation() {
                Content = "node1", Style = new DiagramTextStyle() {
                    Color = "White", StrokeColor = "None"
                }
            });
            List < DiagramNodeAnnotation > Node2 = new List < DiagramNodeAnnotation > ();
            Node2.Add(new DiagramNodeAnnotation() {
                Content = "node2", Style = new DiagramTextStyle() {
                    Color = "White", StrokeColor = "None"
                }
            });
            nodes.Add(new DiagramNode() {
                Id = "node1",
                    Width = 100,
                    Height = 100,
                    Style = new NodeStyleNodes() {
                        Fill = "darkcyan"
                    },
                    OffsetX = 100,
                    OffsetY = 100,
                    Annotations = Node1
            });
           nodes.Add(new DiagramNode() {
                Id = "node2",
                    Width = 100,
                    Height = 100,
                    Style = new NodeStyleNodes() {
                        Fill = "darkcyan"
                    },
                    OffsetX = 300,
                    OffsetY = 300,
                    Annotations = Node2
            });
            ViewBag.nodes = nodes;

            List<DiagramConnector> Connectors = new List<DiagramConnector>();
            Connectors.Add(new DiagramConnector() { Id = "connector", SourceID="node1", TargetID="node2", CornerRadius= 10, Type = Segments.Orthogonal });
            ViewBag.connectors = Connectors;


            return View();
        }
    }
}

Appearance

The connector’s strokeWidth, strokeColor, strokeDashArray, and opacity properties are used to customize the appearance of the connector segments.
The visible property of the connector enables or disables the visibility of connector.
Default values for all the connectors can be set using the getConnectorDefaults properties. For example, if all connectors have the same type or having the same property then such properties can be moved into getConnectorDefaults.

Segment appearance

The following code example illustrates how to customize the segment appearance.

tagHelper

style.cs

<ejs-diagram id="container" width="100%" height="700px" connectors="@ViewBag.connectors">
</ejs-diagram>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Syncfusion.EJ2.Diagrams;
using System.Drawing;

namespace EJ2MVCSampleBrowser.Controllers.Diagram {
    public partial class DiagramController: Controller {
        // GET: Nodes
        public ActionResult Nodes() {

            List<DiagramConnector> Connectors = new List<DiagramConnector>();
            Connectors.Add(new DiagramConnector() { Id = "connector", SourcePoint = new DiagramPoint() { X = 100, Y = 100 }, TargetPoint = new DiagramPoint() { X = 300, Y = 300 }, Type = Segments.Orthogonal, Style = new DiagramStrokeStyle() {  StrokeDashArray = "2,2", StrokeColor = "Red", StrokeWidth = 2 }});
            ViewBag.connectors = Connectors;


            return View();
        }
    }
}

Decorator appearance

The source decorator’s strokeColor, strokeWidth, and strokeDashArray properties are used to customize the color, width, and appearance of the decorator.
To set the border stroke color, stroke width, and stroke dash array for the target decorator, use strokeColor, strokeWidth, and strokeDashArray.
To set the size for source and target decorator, use width and height property.

The following code example illustrates how to customize the appearance of the decorator.

tagHelper

decorator.cs

<ejs-diagram id="container" width="100%" height="700px" connectors="@ViewBag.connectors">
</ejs-diagram>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Syncfusion.EJ2.Diagrams;
using System.Drawing;

namespace EJ2MVCSampleBrowser.Controllers.Diagram {
    public partial class DiagramController: Controller {
        // GET: Nodes
        public ActionResult Nodes() {

            List < DiagramConnector > Connectors = new List < DiagramConnector > ();
            Connectors.Add(new DiagramConnector() {
                Id = "connector", SourcePoint = new DiagramPoint() {
                        X = 100, Y = 100
                    }, TargetPoint = new DiagramPoint() {
                        X = 300, Y = 300
                    }, Type = Segments.Orthogonal, SourceDecorator = new DiagramDecorator() {
                        Shape = DecoratorShapes.IndentedArrow, Style = new DiagramShapeStyle() {
                            StrokeColor = "Blue", StrokeWidth = 3
                        }
                    },
                    TargetDecorator = new DiagramDecorator() {
                        Shape = DecoratorShapes.OutdentedArrow, Style = new DiagramShapeStyle() {
                            StrokeColor = "Yellow", StrokeWidth = 3
                        }
                    }
            });
            ViewBag.connectors = Connectors;

            return View();
        }
    }
}

Interaction

Diagram allows to edit the connectors at runtime. To edit the connector segments at runtime, refer to Connection Editing.

Automatic line routing

Diagram provides additional flexibility to re-route the diagram connectors. A connector will frequently re-route itself when a shape moves next to it. The following screenshot illustrates how the connector automatically re-routes the segments.

The line routing constraints must be included to the default diagram constraints to enable automatic line routing support like below.
The following code block shows how to create the diagram with specifying nodes, connectors, constraints, and necessary modules for line routing.

tagHelper

linerouting.cs

<ejs-diagram id="container" width="100%" height="700px" constraints="DiagramConstraints.Default | DiagramConstraints.LineRouting">
</ejs-diagram>

using System.Collections.Generic; 
using System.Web.Mvc;
using Syncfusion.EJ2.Diagrams;

namespace EJ2MVCSampleBrowser.Controllers.Diagram {
    public partial class DiagramController: Controller {
        // GET: Nodes
 // GET: Connector
        public ActionResult Connector()
        {
            List<DiagramConnector> connectors = new List<DiagramConnector>();

               List<DiagramConnectorAnnotation> annotations = new List<DiagramConnectorAnnotation>();
            annotations.Add(new DiagramConnectorAnnotation() { Offset = .7, Content = "Routing \n enabled" });
            connectors.Add(new DiagramConnector() { Id = "connector", SourceID = "shape1", TargetID = "node2", Type = Segments.Orthogonal, Annotations = annotations });

            annotations = new List<DiagramConnectorAnnotation>();
            annotations.Add(new DiagramConnectorAnnotation() { Offset = .7, Content = "Routing \n disabled" });
            connectors.Add(new DiagramConnector() { Id = "connector2", SourceID = "shape1", TargetID = "node2", Type = Segments.Orthogonal, Annotations = annotations });

            List<Syncfusion.EJ2.Diagrams.DiagramNode> nodes = new List<Syncfusion.EJ2.Diagrams.DiagramNode>();
            List<DiagramNode> Node1 = new List<DiagramNode>();
            nodes.Add(new DiagramNode() { OffsetX = 100, OffsetY = 100, Height = 50, Width = 120 });

            List<DiagramNode> Node1 = new List<DiagramNode>();
            nodes.Add(new DiagramNode() { OffsetX = 300, OffsetY = 300, Height = 50, Width = 120 });

            List<DiagramNode> Node1 = new List<DiagramNode>();
            nodes.Add(new DiagramNode() { OffsetX = 150, OffsetY = 200, Height = 50, Width = 120 }); 

            ViewBag.nodes = nodes;
            ViewBag.connectors = connectors;
            return View();
        }
    }
}

In some situations, automatic line routing enabled diagram needs to ignore a specific connector from automatic line routing. So, in this case, auto routing feature can be disabled to the specific connector using the constraints property of the connector like the following code snippet.

tagHelper

linerouting1.cs

<ejs-diagram id="container" width="100%" height="700px" constraints="DiagramConstraints.Default | DiagramConstraints.LineRouting">
</ejs-diagram>

using System.Collections.Generic; 
using System.Web.Mvc;
using Syncfusion.EJ2.Diagrams;

namespace EJ2MVCSampleBrowser.Controllers.Diagram {
    public partial class DiagramController: Controller {
        // GET: Nodes
 // GET: Connector
        public ActionResult Connector()
        {
            List<DiagramConnector> connectors = new List<DiagramConnector>();

            List<DiagramConnectorAnnotation> annotations = new List<DiagramConnectorAnnotation>();
            annotations.Add(new DiagramConnectorAnnotation() { Offset = .7, Content = "Routing \n enabled" });
            connectors.Add(new DiagramConnector() { Id = "connector", SourceID = "shape1", TargetID = "node2", Type = Segments.Orthogonal, Annotations = annotations });

            annotations = new List<DiagramConnectorAnnotation>();
            annotations.Add(new DiagramConnectorAnnotation() { Offset = .7, Content = "Routing \n disabled" });
            connectors.Add(new DiagramConnector() { Id = "connector2", SourceID = "shape1", TargetID = "node2", Constraints = ConnectorConstraints.Default & ~ConnectorConstraints.InheritLineRouting  Type = Segments.Orthogonal, Annotations = annotations });

            List<Syncfusion.EJ2.Diagrams.DiagramNode> nodes = new List<Syncfusion.EJ2.Diagrams.DiagramNode>();
            List<DiagramNode> Node1 = new List<DiagramNode>();
            nodes.Add(new DiagramNode() { OffsetX = 100, OffsetY = 100, Height = 50, Width = 120 });

            List<DiagramNode> Node1 = new List<DiagramNode>();
            nodes.Add(new DiagramNode() { OffsetX = 350, OffsetY = 350, Height = 50, Width = 120 });

            List<DiagramNode> Node1 = new List<DiagramNode>();
            nodes.Add(new DiagramNode() { OffsetX = 150, OffsetY = 200, Height = 50, Width = 120 });

            List<DiagramNode> Node1 = new List<DiagramNode>();
            nodes.Add(new DiagramNode() { OffsetX = 300, OffsetY = 200, Height = 50, Width = 120 });


            ViewBag.nodes = nodes;
            ViewBag.connectors = connectors;
            return View();
        }
    }
}

Constraints

The constraints property of connector allows to enable/disable certain features of connectors.
To enable or disable the constraints, refer constraints.

The following code illustrates how to disable selection.

tagHelper

constraints.cs

<ejs-diagram id="container" width="100%" height="700px" connectors="@ViewBag.connectors">
</ejs-diagram>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Syncfusion.EJ2.Diagrams;
using System.Drawing;

namespace EJ2MVCSampleBrowser.Controllers.Diagram {
    public partial class DiagramController: Controller {
        // GET: Nodes
        public ActionResult Nodes() {

            List<DiagramConnector> Connectors = new List<DiagramConnector>();
            Connectors.Add(new DiagramConnector() { Id = "connector", SourcePoint = new DiagramPoint() { X = 100, Y = 100 }, TargetPoint = new DiagramPoint() { X = 300, Y = 300 }, Constraints = ConnectorConstraints.Default & ~ConnectorConstraints.Select });
            ViewBag.connectors = Connectors;


            return View();
        }
    }
}

Custom properties

The addInfo property of connectors allow you to maintain additional information to the connectors.

var connectors = {
id: 'connector1',
// Defines the information about the connector
addInfo:'centralconnector',
type: 'Straight',
sourceID: 'Transaction',
targetID: 'Verification'
};

Stack order

The connectors zIndex property specifies the stack order of the connector. A connector with greater stack order is always in front of a connector with a lower stack order.

The following code illustrates how to render connector based on the stack order.

tagHelper

zindex.cs

<ejs-diagram id="container" width="100%" height="700px" connectors="@ViewBag.connectors">
</ejs-diagram>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Syncfusion.EJ2.Diagrams;
using System.Drawing;

namespace EJ2MVCSampleBrowser.Controllers.Diagram {
    public partial class DiagramController: Controller {
        // GET: Nodes
        public ActionResult Nodes() {

            List<DiagramConnector> Connectors = new List<DiagramConnector>();
            Connectors.Add(new DiagramConnector() { Id = "connector", SourcePoint = new DiagramPoint() { X = 100, Y = 100 }, TargetPoint = new DiagramPoint() { X = 300, Y = 300 }, ZIndex = 1 });
            ViewBag.connectors = Connectors;


            return View();
        }
    }
}

Connector in ASP.NET Core Diagram control

Create connector

Add connectors through connectors collection

Add connector at runtime

Connectors from palette

Draw connectors

Update connector at runtime

Connect nodes

Connections with ports

Segments

Straight

Orthogonal

Avoid overlapping

Bezier

Decorator

Padding

Flip

Bridging

Corner radius

Appearance

Segment appearance

Decorator appearance

Interaction

Automatic line routing

Constraints

Custom properties

Stack order

See Also