Class FourPositionsLabelsStrategy

Represents a Fast Algorithm for Label Placement implementation for the RadChartView labels.

Inheritance
System.Object
SmartLabelsStrategyBase
FourPositionsLabelsStrategy
EightPositionsLabelsStrategy
Inherited Members
System.Object.ToString()
System.Object.Equals(System.Object)
System.Object.Equals(System.Object, System.Object)
System.Object.ReferenceEquals(System.Object, System.Object)
System.Object.GetHashCode()
System.Object.GetType()
System.Object.MemberwiseClone()
Namespace: Telerik.WinControls.UI
Assembly: Telerik.WinControls.ChartView.dll

Syntax

public class FourPositionsLabelsStrategy : SmartLabelsStrategyBase

Constructors

FourPositionsLabelsStrategy()

Declaration
public FourPositionsLabelsStrategy()

Properties

PositionsPerLabel

Gets or sets the number of label positions the strategy will serach in.

Declaration
protected virtual int PositionsPerLabel { get; }
Property Value
System.Int32

Methods

AssignMinimumOverlapLabels()

Adds any labels that do not have a position set to the position with the least collisions.

Declaration
protected virtual void AssignMinimumOverlapLabels()

AssignSmartRectangles(ChartSeriesCollection)

Assigns the smart rectangles of labels.

Declaration
protected virtual void AssignSmartRectangles(ChartSeriesCollection series)
Parameters
ChartSeriesCollection series

The series.

BuildAdjacencyMatrix(ChartSeriesCollection)

Builds the adjacency matrix. A matrix that represents the collision graph of all labels.

Declaration
protected virtual void BuildAdjacencyMatrix(ChartSeriesCollection series)
Parameters
ChartSeriesCollection series

The series.

CalculateLocations(ChartSeriesCollection, Rectangle)

Within this method labels' positions are calculated and are set to the SmartLocation property of each label.

Declaration
public override void CalculateLocations(ChartSeriesCollection series, Rectangle plotArea)
Parameters
ChartSeriesCollection series

All the series in the current chart view.
System.Drawing.Rectangle plotArea

The plot area.
Overrides

GetAllLabelPositions(LabelElement)

Gets all the possible label positions.

Declaration
protected virtual IEnumerable<Rectangle> GetAllLabelPositions(LabelElement label)
Parameters
LabelElement label

The label.
Returns
System.Collections.Generic.IEnumerable<System.Drawing.Rectangle>

GetLabelLineSide(Int32)

Gets the label LineSide corresponding to the label position.

Declaration
protected virtual LineSide GetLabelLineSide(int labelPosition)
Parameters
System.Int32 labelPosition

The label position.
Returns
LineSide

GetLabelRectangle(LabelElement, Int32)

Gets the label rectangle from its position.

Declaration
protected virtual Rectangle GetLabelRectangle(LabelElement label, int labelPosition)
Parameters
LabelElement label

The label.
System.Int32 labelPosition

The label position.
Returns
System.Drawing.Rectangle

HasUnassignedLabels()

Determines whether the are labels with unassigned label position.

Declaration
protected virtual bool HasUnassignedLabels()
Returns
System.Boolean

true if [has unassigned labels]; otherwise, false.

IsFinalSolution()

Determines whether the current state of the adjacency matrix is a final solution.

Declaration
protected virtual bool IsFinalSolution()
Returns
System.Boolean

true if it is final solution; otherwise, false.

IsMatrixEmpty()

Determines whether there are uncheck label positions in the adjacency matrix.

Declaration
protected virtual bool IsMatrixEmpty()
Returns
System.Boolean

true if [is matrix empty]; otherwise, false.

LocalOptimization()

Peforms local optiomizations to labels that improve the global solution.

Declaration
protected virtual void LocalOptimization()

MaximumNonconflict()

Places as much as possible labels into positions without overlaps.

Declaration
protected virtual void MaximumNonconflict()

Extension Methods