Radial-Tree layout in WPF Diagram (SfDiagram)

18 Nov 2020 / 16 minutes to read

The Radial-Tree layout is a specification of the Directed Tree Layout Manager that employs a circular layout algorithm for locating the diagram nodes. The Radial-Tree Layout arranges nodes in a circular layout, positioning the root node at the center of the graph and the child nodes in a circular fashion around the root. Sub-trees formed by the branching of child nodes are located radically around the child nodes.

The arrangement results in an ever-expanding concentric arrangement with radial proximity to the root node indicating the node level in the hierarchy. However, it is necessary to specify a layout root for the tree layout as the Radial-Tree Layout positions the nodes based on the LayoutRoot.

<!--Initialize employee collection-->            
<local:Employees x:Key="employees">                
    <local:Employee EmpId = "1" ParentId = "" Imageurl = "./Assets/Thomas.png" />
    <local:Employee EmpId = "2" ParentId = "1" Imageurl = "./Assets/Clayton.png" />
    <local:Employee EmpId = "3" ParentId = "1" Imageurl = "./Assets/eric.png" />
    <local:Employee EmpId = "4" ParentId = "1" Imageurl = "./Assets/John.png" />
    <local:Employee EmpId = "5" ParentId = "1" Imageurl = "./Assets/image12.png" />
    <local:Employee EmpId = "6" ParentId = "1" Imageurl = "./Assets/image2.png" />
    <local:Employee EmpId = "7" ParentId = "1" Imageurl = "./Assets/image3.png" />
    <local:Employee EmpId = "8" ParentId = "1" Imageurl = "./Assets/image50.png" />
    <local:Employee EmpId = "9" ParentId = "2" Imageurl = "./Assets/image51.png" />
    <local:Employee EmpId = "10" ParentId = "2" Imageurl = "./Assets/image53.png" />
    <local:Employee EmpId = "11" ParentId = "3" Imageurl = "./Assets/image54.png" />
    <local:Employee EmpId = "12" ParentId = "3" Imageurl = "./Assets/image55.png" />
    <local:Employee EmpId = "13" ParentId = "4" Imageurl = "./Assets/image56.png" />
    <local:Employee EmpId = "14" ParentId = "4" Imageurl = "./Assets/image57.png" />
    <local:Employee EmpId = "15" ParentId = "5" Imageurl = "./Assets/images7.png" />
    <local:Employee EmpId = "16" ParentId = "5" Imageurl = "./Assets/images9.png" />
    <local:Employee EmpId = "17" ParentId = "6" Imageurl = "./Assets/Jenny.png" />
    <local:Employee EmpId = "18" ParentId = "6" Imageurl = "./Assets/John.png" />
    <local:Employee EmpId = "19" ParentId = "7" Imageurl = "./Assets/eric.png" />
    <local:Employee EmpId = "20" ParentId = "7" Imageurl = "./Assets/Maria.png" />
    <local:Employee EmpId = "21" ParentId = "8" Imageurl = "./Assets/image12.png" />
    <local:Employee EmpId = "22" ParentId = "8" Imageurl = "./Assets/Paul.png" />
    <local:Employee EmpId = "23" ParentId = "9" Imageurl = "./Assets/Robin.png" />
    <local:Employee EmpId = "24" ParentId = "9" Imageurl = "./Assets/smith.png" />
    <local:Employee EmpId = "25" ParentId = "10" Imageurl = "./Assets/Thomas.png" />
    <local:Employee EmpId = "26" ParentId = "10" Imageurl = "./Assets/Clayton.png" />
    <local:Employee EmpId = "27" ParentId = "11" Imageurl = "./Assets/eric.png" />
    <local:Employee EmpId = "28" ParentId = "11" Imageurl = "./Assets/images7.png" />
    <local:Employee EmpId = "29" ParentId = "12" Imageurl = "./Assets/image12.png" />
    <local:Employee EmpId = "30" ParentId = "12" Imageurl = "./Assets/image2.png" />
    <local:Employee EmpId = "31" ParentId = "13" Imageurl = "./Assets/image3.png" />
    <local:Employee EmpId = "32" ParentId = "13" Imageurl = "./Assets/image50.png" />
    <local:Employee EmpId = "33" ParentId = "14" Imageurl = "./Assets/image51.png" />
    <local:Employee EmpId = "34" ParentId = "14" Imageurl = "./Assets/image53.png" />
    <local:Employee EmpId = "35" ParentId = "15" Imageurl = "./Assets/image54.png" />
    <local:Employee EmpId = "36" ParentId = "15" Imageurl = "./Assets/image55.png" />
    <local:Employee EmpId = "37" ParentId = "16" Imageurl = "./Assets/image56.png" />
    <local:Employee EmpId = "38" ParentId = "16" Imageurl = "./Assets/image57.png" />
    <local:Employee EmpId = "39" ParentId = "17" Imageurl = "./Assets/images7.png" />
    <local:Employee EmpId = "40" ParentId = "17" Imageurl = "./Assets/images9.png" />
    <local:Employee EmpId = "41" ParentId = "18" Imageurl = "./Assets/Jenny.png" />
    <local:Employee EmpId = "42" ParentId = "18" Imageurl = "./Assets/John.png" />
    <local:Employee EmpId = "43" ParentId = "19" Imageurl = "./Assets/Clayton.png" />
    <local:Employee EmpId = "44" ParentId = "19" Imageurl = "./Assets/Maria.png" />
    <local:Employee EmpId = "45" ParentId = "20" Imageurl = "./Assets/image55.png" />
    <local:Employee EmpId = "46" ParentId = "20" Imageurl = "./Assets/Paul.png" />
    <local:Employee EmpId = "47" ParentId = "21" Imageurl = "./Assets/Robin.png" />
    <local:Employee EmpId = "48" ParentId = "21" Imageurl = "./Assets/smith.png" />
    <local:Employee EmpId = "49" ParentId = "22" Imageurl = "./Assets/Thomas.png" />
    <local:Employee EmpId = "50" ParentId = "22" Imageurl = "./Assets/John.png" />
</local:Employees>

<!--Initializes the DataSourceSettings -->
<syncfusion:DataSourceSettings x:Key="DataSourceSettings" 
                               ParentId="ParentId" Id="EmpId"
                               DataSource="{StaticResource employees}" 
                               Root="1"/>
    <!--Initialize the Layout-->
    <syncfusion:RadialTreeLayout x:Key="treeLayout" 
                                 HorizontalSpacing="30" 
                                 VerticalSpacing="50" />
    <!--Initialize the Layout Manager-->
    <syncfusion:LayoutManager x:Key="layoutManager" Layout="{StaticResource treeLayout}" />
//Initialize employee collection
Employees employee = new Employees();

employee.Add(new Employee() { EmpId = "1", ParentId = "", Imageurl = "./Assets/Thomas.png" });
employee.Add(new Employee() { EmpId = "2", ParentId = "1", Imageurl = "./Assets/Clayton.png" });
employee.Add(new Employee() { EmpId = "3", ParentId = "1", Imageurl = "./Assets/eric.png" });
employee.Add(new Employee() { EmpId = "4", ParentId = "1", Imageurl = "./Assets/John.png" });
employee.Add(new Employee() { EmpId = "5", ParentId = "1", Imageurl = "./Assets/image12.png" });
employee.Add(new Employee() { EmpId = "6", ParentId = "1", Imageurl = "./Assets/image2.png" });
employee.Add(new Employee() { EmpId = "7", ParentId = "1", Imageurl = "./Assets/image3.png" });
employee.Add(new Employee() { EmpId = "8", ParentId = "1", Imageurl = "./Assets/image50.png" });
employee.Add(new Employee() { EmpId = "9", ParentId = "2", Imageurl = "./Assets/image51.png" });
employee.Add(new Employee() { EmpId = "10", ParentId = "2", Imageurl = "./Assets/image53.png" });
employee.Add(new Employee() { EmpId = "11", ParentId = "3", Imageurl = "./Assets/image54.png" });
employee.Add(new Employee() { EmpId = "12", ParentId = "3", Imageurl = "./Assets/image55.png" });
employee.Add(new Employee() { EmpId = "13", ParentId = "4", Imageurl = "./Assets/image56.png" });
employee.Add(new Employee() { EmpId = "14", ParentId = "4", Imageurl = "./Assets/image57.png" });
employee.Add(new Employee() { EmpId = "15", ParentId = "5", Imageurl = "./Assets/images7.png" });
employee.Add(new Employee() { EmpId = "16", ParentId = "5", Imageurl = "./Assets/images9.png" });
employee.Add(new Employee() { EmpId = "17", ParentId = "6", Imageurl = "./Assets/Jenny.png" });
employee.Add(new Employee() { EmpId = "18", ParentId = "6", Imageurl = "./Assets/John.png" });
employee.Add(new Employee() { EmpId = "19", ParentId = "7", Imageurl = "./Assets/eric.png" });
employee.Add(new Employee() { EmpId = "20", ParentId = "7", Imageurl = "./Assets/Maria.png" });
employee.Add(new Employee() { EmpId = "21", ParentId = "8", Imageurl = "./Assets/image12.png" });
employee.Add(new Employee() { EmpId = "22", ParentId = "8", Imageurl = "./Assets/Paul.png" });
employee.Add(new Employee() { EmpId = "23", ParentId = "9", Imageurl = "./Assets/Robin.png" });
employee.Add(new Employee() { EmpId = "24", ParentId = "9", Imageurl = "./Assets/smith.png" });
employee.Add(new Employee() { EmpId = "25", ParentId = "10", Imageurl = "./Assets/Thomas.png" });
employee.Add(new Employee() { EmpId = "26", ParentId = "10", Imageurl = "./Assets/Clayton.png" });
employee.Add(new Employee() { EmpId = "27", ParentId = "11", Imageurl = "./Assets/eric.png" });
employee.Add(new Employee() { EmpId = "28", ParentId = "11", Imageurl = "./Assets/images7.png" });
employee.Add(new Employee() { EmpId = "29", ParentId = "12", Imageurl = "./Assets/image12.png" });
employee.Add(new Employee() { EmpId = "30", ParentId = "12", Imageurl = "./Assets/image2.png" });
employee.Add(new Employee() { EmpId = "31", ParentId = "13", Imageurl = "./Assets/image3.png" });
employee.Add(new Employee() { EmpId = "32", ParentId = "13", Imageurl = "./Assets/image50.png" });
employee.Add(new Employee() { EmpId = "33", ParentId = "14", Imageurl = "./Assets/image51.png" });
employee.Add(new Employee() { EmpId = "34", ParentId = "14", Imageurl = "./Assets/image53.png" });
employee.Add(new Employee() { EmpId = "35", ParentId = "15", Imageurl = "./Assets/image54.png" });
employee.Add(new Employee() { EmpId = "36", ParentId = "15", Imageurl = "./Assets/image55.png" });
employee.Add(new Employee() { EmpId = "37", ParentId = "16", Imageurl = "./Assets/image56.png" });
employee.Add(new Employee() { EmpId = "38", ParentId = "16", Imageurl = "./Assets/image57.png" });
employee.Add(new Employee() { EmpId = "39", ParentId = "17", Imageurl = "./Assets/images7.png" });
employee.Add(new Employee() { EmpId = "40", ParentId = "17", Imageurl = "./Assets/images9.png" });
employee.Add(new Employee() { EmpId = "41", ParentId = "18", Imageurl = "./Assets/Jenny.png" });
employee.Add(new Employee() { EmpId = "42", ParentId = "18", Imageurl = "./Assets/John.png" });
employee.Add(new Employee() { EmpId = "43", ParentId = "19", Imageurl = "./Assets/Clayton.png" });
employee.Add(new Employee() { EmpId = "44", ParentId = "19", Imageurl = "./Assets/Maria.png" });
employee.Add(new Employee() { EmpId = "45", ParentId = "20", Imageurl = "./Assets/image55.png" });
employee.Add(new Employee() { EmpId = "46", ParentId = "20", Imageurl = "./Assets/Paul.png" });
employee.Add(new Employee() { EmpId = "47", ParentId = "21", Imageurl = "./Assets/Robin.png" });
employee.Add(new Employee() { EmpId = "48", ParentId = "21", Imageurl = "./Assets/smith.png" });
employee.Add(new Employee() { EmpId = "49", ParentId = "22", Imageurl = "./Assets/Thomas.png" });
employee.Add(new Employee() { EmpId = "50", ParentId = "22", Imageurl = "./Assets/John.png" });

//Initialize Datatsource settings
diagram.DataSourceSettings = new DataSourceSettings()
{
    Id = "EmpId",
    ParentId = "ParentId",
    DataSource = employee,
    Root = "1",
};

//Initialize LayoutManager
diagram.LayoutManager = new LayoutManager()
{
    Layout = new RadialTreeLayout()
    {
        HorizontalSpacing = 10,
        VerticalSpacing = 30,
    }
};

RadialLayout

View sample in GitHub

Customize Bounds in layout

The Bounds Property of RadialTreeLayout is used to define the region where the layout to be rendered based on its root. It is valid only for RadialTreeLayout.

<syncfusion:RadialTreeLayout Bounds="0,0,1000,1000"/>
diagram.LayoutManager = new LayoutManager()
{
    Layout = new RadialTreeLayout()
    {
        Bounds = new Rect(0,0,1000,1000),
    },
};