Class CircularLayout
This layout positions nodes in a circular arrangement.
Inheritance
Namespace: Northwoods.Go.Layouts
Assembly: Northwoods.GoDiagram.Avalonia.CircularLayout.dll
Syntax
public class CircularLayout : NetworkLayout<CircularNetwork, CircularVertex, CircularEdge, CircularLayout>Remarks
There are several samples that use CircularLayout. The layout cannot guarantee that it provides optimal positioning of nodes when trying to minimize link crossings.
If you want to experiment interactively with most of the properties, try the Circular Layout sample. See samples that make use of CircularLayout in the samples index.
This layout makes use of a Network<V, E, Y> of CircularVertexes and CircularEdges that normally correspond to the Nodes and Links of the Diagram.
Constructors
CircularLayout()
Constructs a CircularLayout with no Network and with no owning Diagram.
Declaration
public CircularLayout()Properties
ActualCenter
This read-only property is the coordinates of the center of the laid-out ellipse immediately after the layout.
Declaration
public Point ActualCenter { get; }Property Value
| Type | Description |
|---|---|
| Point |
ActualSpacing
This read-only property is the effective spacing that may have been calculated by the layout.
Declaration
public double ActualSpacing { get; }Property Value
| Type | Description |
|---|---|
| double |
ActualXRadius
This read-only property is the effective X radius that may have been calculated by the layout.
Declaration
public double ActualXRadius { get; }Property Value
| Type | Description |
|---|---|
| double |
ActualYRadius
This read-only property is the effective Y radius that may have been calculated by the layout.
Declaration
public double ActualYRadius { get; }Property Value
| Type | Description |
|---|---|
| double |
Arrangement
Gets or sets how the nodes are spaced.
Declaration
public CircularArrangement Arrangement { get; set; }Property Value
| Type | Description |
|---|---|
| CircularArrangement |
Remarks
If Arrangement == Packed, the specified Radius will be ignored.
The default value is ConstantSpacing.
AspectRatio
Gets or sets the ratio of the arrangement's height to its width (1 for a circle, >1 for a vertically elongated ellipse).
Declaration
public double AspectRatio { get; set; }Property Value
| Type | Description |
|---|---|
| double |
Remarks
This is 1 by default. The value must be a positive number.
Modifying this value changes the height, but keeps the width and the Radius constant.
Comparer
Gets or sets the comparer which sorts the data when Sorting is set to Ascending or Descending.
Declaration
public Comparison<CircularVertex> Comparer { get; set; }Property Value
| Type | Description |
|---|---|
| Comparison<CircularVertex> |
Remarks
Direction
Gets or sets whether the nodes are arranged clockwise or counterclockwise.
Declaration
public CircularDirection Direction { get; set; }Property Value
| Type | Description |
|---|---|
| CircularDirection |
Remarks
The default value is Clockwise.
NodeDiameterFormula
Specifies how the diameter of nodes will be calculated.
Declaration
public CircularNodeDiameterFormula NodeDiameterFormula { get; set; }Property Value
| Type | Description |
|---|---|
| CircularNodeDiameterFormula |
Remarks
When a node is not circular, it is not clear what its diameter is.
The default is Pythagorean.
Radius
Gets or sets the horizontal radius of the elliptical arrangement.
Declaration
public double Radius { get; set; }Property Value
| Type | Description |
|---|---|
| double |
Remarks
The default value is NaN. NaN indicates that the Spacing will determine the size of the ring.
If Spacing is also NaN, the effective spacing will be 6. If Spacing is a number, the effective radius will be > radius if and only if the spacing between elements would otherwise be less than spacing.
The specified value for Radius will be ignored if Arrangement == Packed.
This property must always be positive or NaN.
Sorting
Gets or sets if and how the nodes are sorted.
Declaration
public CircularSorting Sorting { get; set; }Property Value
| Type | Description |
|---|---|
| CircularSorting |
Remarks
Forwards indicates that the nodes are arranged in the order the layout gets them. Reverse indicates that the nodes are arranged in the reverse order that the layout gets them. Ascending and Descending indicate that the nodes will be sorted using the Comparer. Optimized indicates that the nodes will be arranged to minimize link crossings.
The default value is Optimized.
Spacing
Gets or sets the distance between nodes (if Radius is NaN) or the minimum distance between nodes (if Radius is a number).
Declaration
public double Spacing { get; set; }Property Value
| Type | Description |
|---|---|
| double |
Remarks
The default value is 6. The value may be NaN.
If Spacing is NaN, there is no minimum spacing, allowing nodes to overlap, unless Radius is NaN, in which case the effective spacing will be 6 to determine an effective radius. If Spacing is a number but Radius isn't, the effective spacing will be spacing, and this will determine the effective radius. If both Spacing and Radius are numbers, the effective radius will be at least Radius, but may be larger so that the minimum spacing between nodes is Spacing.
StartAngle
Gets or sets the angle (in degrees, clockwise from the positive side of the X axis) of the first element.
Declaration
public double StartAngle { get; set; }Property Value
| Type | Description |
|---|---|
| double |
Remarks
The default value is 0.
SweepAngle
Gets or sets the absolute angle (in degrees) between the first and last node.
Declaration
public double SweepAngle { get; set; }Property Value
| Type | Description |
|---|---|
| double |
Remarks
The default value is 360. The value must be greater than zero and less than or equal to 360. If it is not in this range, it will be automatically set to 360.
Whether the arrangement is clockwise or counterclockwise does not depend on the sign of this value. The direction can be controlled by setting Direction. If 360 is the specified value, the actual value will be less to keep the first and last elements from overlapping, and the spacing between the first and last nodes will be determined the same way as for all other adjacent nodes.
Methods
CommitLayout()
Declaration
protected override void CommitLayout()Overrides
Remarks
You should not call this method -- it is a "protected virtual" method.
CommitLinks()
Commit the position and routing of all edge links.
Declaration
protected virtual void CommitLinks()Remarks
This is called by CommitLayout(). This is only called if IsRouting is true. Please read the Introduction page on Extensions for how to override methods and how to call this base method.
CommitNodes()
Commit the position of all vertex nodes.
Declaration
protected virtual void CommitNodes()Remarks
Please read the Introduction page on Extensions for how to override methods and how to call this base method.
DoLayout(IEnumerable<Part>)
Assign the positions of the vertexes in the network.
Declaration
public override void DoLayout(IEnumerable<Part> coll = null)Parameters
| Type | Name | Description |
|---|---|---|
| IEnumerable<Part> | coll |