Class CircularPointer

Represents the pointer visual element that moves along the circular scale of the circular gauge.

Inheritance
System.Object
GaugeElement
CircularPointer
Inherited Members
Namespace: Syncfusion.Windows.Gauge
Assembly: Syncfusion.Gauge.WPF.dll
Syntax
public class CircularPointer : GaugeElement
Remarks

To use a pointer as a MarkerPointer, the PointerNeedleType should be set to marker and MarkerStyle can be choosed from the available styles.

Examples



 







using System;
using System.Windows;
using System.Windows.Controls;
using Syncfusion.Windows.Shared;
using Syncfusion.Windows.Gauge;

namespace CircularPointerSample
{
    public partial class Window1 : Window
    {
        private CircularScale m_scale;       
        private CircularGauge m_gauge;
        public Window1()
        {
            InitializeComponent();

            m_scale = new CircularScale();
            m_gauge = new CircularGauge();
            m_scale.ShadowOffset = 1;
            m_scale.Minimum = 0;
            m_scale.Maximum = 100;
            m_scale.MinorIntervalValue = 2;
            m_scale.MajorIntervalValue = 10;
            m_scale.StartAngle = 120;
            m_scale.GapSweepAngle = 300;
            m_scale.ScaleBarSize = 1.5;
            m_scale.Radius = 116;
            this.m_gauge.Scales.Add(m_scale);
            CircularPointer pointer1 = new CircularPointer();          
            pointer1.PointerLength = 100;
            pointer1.PointerWidth = 20;
            pointer1.PointerPlacement = ScalePlacement.Outside;
            m_scale.Pointers.Add(pointer1);
            this.Content = m_gauge;
        }
    }
}

Constructors

CircularPointer()

Initializes a new instance of the CircularPointer class.

Declaration
public CircularPointer()

Fields

AnimationDurationProperty

Identifies the AnimationDuration dependency property.

Declaration
public static readonly DependencyProperty AnimationDurationProperty
Field Value
Type
System.Windows.DependencyProperty

DecrementKeyProperty

Identifies the DecrementKey dependency property.

Declaration
public static readonly DependencyProperty DecrementKeyProperty
Field Value
Type
System.Windows.DependencyProperty

EnablePointerInteractionProperty

Identifies the EnablePointerInteraction dependency property.

Declaration
public static readonly DependencyProperty EnablePointerInteractionProperty
Field Value
Type
System.Windows.DependencyProperty

EnableSizeToContainerProperty

Identifies the EnableSizeToContainer dependency property.

Declaration
public static readonly DependencyProperty EnableSizeToContainerProperty
Field Value
Type
System.Windows.DependencyProperty

IncrementKeyProperty

Identifies the IncrementKey dependency property.

Declaration
public static readonly DependencyProperty IncrementKeyProperty
Field Value
Type
System.Windows.DependencyProperty

IsAnimationEnabledProperty

Identifies the IsAnimationEnabled dependency property.

Declaration
public static readonly DependencyProperty IsAnimationEnabledProperty
Field Value
Type
System.Windows.DependencyProperty

MarkerCustomGeometryProperty

Identifies the MarkerCustomGeometry dependency property.

Declaration
public static readonly DependencyProperty MarkerCustomGeometryProperty
Field Value
Type
System.Windows.DependencyProperty

MarkerStyleProperty

Identifies the MarkerStyle dependency property.

Declaration
public static readonly DependencyProperty MarkerStyleProperty
Field Value
Type
System.Windows.DependencyProperty

NeedleCustomGeometryProperty

Identifies the NeedleCustomGeometry dependency property.

Declaration
public static readonly DependencyProperty NeedleCustomGeometryProperty
Field Value
Type
System.Windows.DependencyProperty

NeedleStyleProperty

Identifies the NeedleStyle dependency property.

Declaration
public static readonly DependencyProperty NeedleStyleProperty
Field Value
Type
System.Windows.DependencyProperty

PointerLengthProperty

Identifies the PointerLength dependency property.

Declaration
public static readonly DependencyProperty PointerLengthProperty
Field Value
Type
System.Windows.DependencyProperty

PointerNeedleTypeProperty

Identifies the PointerNeedleType dependency property.

Declaration
public static readonly DependencyProperty PointerNeedleTypeProperty
Field Value
Type
System.Windows.DependencyProperty

PointerPlacementProperty

Identifies the PointerPlacement dependency property.

Declaration
public static readonly DependencyProperty PointerPlacementProperty
Field Value
Type
System.Windows.DependencyProperty

PointerWidthProperty

Identifies the PointerWidth dependency property.

Declaration
public static readonly DependencyProperty PointerWidthProperty
Field Value
Type
System.Windows.DependencyProperty

ValueProperty

Identifies the Value dependency property.

Declaration
public static readonly DependencyProperty ValueProperty
Field Value
Type
System.Windows.DependencyProperty

Properties

AnimationDuration

Gets or sets the animation duration of the pointer. This is a dependency property.

Declaration
public double AnimationDuration { get; set; }
Property Value
Type Description
System.Double

Type: System.Double Default value is Double.NaN.

DecrementKey

Gets or sets the Decrement key for the pointer. This is a dependency property.

Declaration
public Key DecrementKey { get; set; }
Property Value
Type Description
System.Windows.Input.Key

Type: System.Windows.Input.Key Default value is Down key.

EnablePointerInteraction

Gets or sets whether the pointer interactivity of the pointer is enabled or not. This is a dependency property.

Declaration
public bool EnablePointerInteraction { get; set; }
Property Value
Type Description
System.Boolean

Type: System.Boolean Default value is true.

EnableSizeToContainer

Gets or sets a value indicating whether [enable size to container].

Declaration
public bool EnableSizeToContainer { get; set; }
Property Value
Type Description
System.Boolean

true if [enable size to container]; otherwise, false.

IncrementKey

Gets or sets the Increment key for the pointer. This is a dependency property.

Declaration
public Key IncrementKey { get; set; }
Property Value
Type Description
System.Windows.Input.Key

Type: System.Windows.Input.Key Default value is Up key.

IsAnimationEnabled

Gets or sets a value indicating whether animation is enabled or not.

Declaration
public bool IsAnimationEnabled { get; set; }
Property Value
Type Description
System.Boolean

true if this instance ; otherwise, false.

IsLogarithmic

Gets or sets a value indicating whether IsLogarithmic value is true or false, so that log values can be displayed on the scale.This is a dependency property.

Declaration
public bool IsLogarithmic { get; set; }
Property Value
Type Description
System.Boolean

Type: System.Boolean Default IsLogarithmic is "False".
See Also

LogBase

Gets or sets the LogBase value that can be displayed in the scale. This is a dependency property.

Declaration
public double LogBase { get; set; }
Property Value
Type Description
System.Double

Type: System.Double Default LogBase is 10.
See Also

MarkerCustomGeometry

Gets or sets the custom geometry value for Marker.

Declaration
public Geometry MarkerCustomGeometry { get; set; }
Property Value
Type Description
System.Windows.Media.Geometry

Type : System.Windows.Media.Geometry Default Value is Null.

MarkerStyle

Gets or sets the shape of the marker pointer. This is a dependency property.

Declaration
public MarkerStyle MarkerStyle { get; set; }
Property Value
Type Description
MarkerStyle

Type: MarkerStyle Default value is MarkerStyle.Rectangle.
See Also

NeedleCustomGeometry

Gets or sets the custom geometry value for Needle.

Declaration
public Geometry NeedleCustomGeometry { get; set; }
Property Value
Type Description
System.Windows.Media.Geometry

Type : System.Windows.Media.Geometry Default Value is Null.

NeedleStyle

Gets or sets the shape of the needle pointer. This is a dependency property.

Declaration
public NeedleStyle NeedleStyle { get; set; }
Property Value
Type Description
NeedleStyle

Type: NeedleStyle Default value is NeedleStyle.Triangle.
See Also

PointerLength

Gets or sets the length of the pointer. This is a dependency property.

Declaration
public double PointerLength { get; set; }
Property Value
Type Description
System.Double

Type: System.Double Default value is 0.
See Also

PointerNeedleType

Gets or sets the pointer needle type. This is a dependency property.

Declaration
public PointerNeedleType PointerNeedleType { get; set; }
Property Value
Type Description
PointerNeedleType

Type: PointerNeedleType Default value is PointerNeedleType.Needle.

PointerPlacement

Gets or sets the position to place the pointer relative to the scale. This is a dependency property.

Declaration
public ScalePlacement PointerPlacement { get; set; }
Property Value
Type Description
ScalePlacement

Type: ScalePlacement Default value is ScalePlacement.Inside.

PointerWidth

Gets or sets the width of the pointer. This is a dependency property.

Declaration
public double PointerWidth { get; set; }
Property Value
Type Description
System.Double

Type: System.Double Default value is 0.

Value

Gets or sets the value indicated by the pointer. This is a dependency property.

Declaration
public double Value { get; set; }
Property Value
Type Description
System.Double

Type: System.Double Default value is 0.

Methods

AngleToValue(Double, Double)

Method to convert Angle to Value in circularknob.

Declaration
protected virtual double AngleToValue(double angle, double pointervalue)
Parameters
Type Name Description
System.Double angle

Angle value for conversion
System.Double pointervalue

previous pointer value
Returns
Type Description
System.Double

Value corresponding to that given angle

ArrangeOverride(Size)

Positions child elements and determines a size for the element.

Declaration
protected override Size ArrangeOverride(Size finalSize)
Parameters
Type Name Description
System.Windows.Size finalSize

The final area within the parent that this element should use to arrange itself and its children.
Returns
Type Description
System.Windows.Size

The actual size used.
Remarks

Method returns the actual size used as the same value as that of the size given by its parent to arrange the pointer. Instead of actually arranging the pointer, it just initializes the m_needlePath according to the shape of the pointer.

CoercePointerLength(Object)

Fulfils the logic before setting the value of PointerLength dependency property.

Declaration
protected virtual object CoercePointerLength(object value)
Parameters
Type Name Description
System.Object value

The value that should be corrected.
Returns
Type Description
System.Object

The corrected value.

CoercePointerLength(DependencyObject, Object)

Coerces the value of the PointerLength property.

Declaration
public static object CoercePointerLength(DependencyObject d, object value)
Parameters
Type Name Description
System.Windows.DependencyObject d

The CircularPointer object.
System.Object value

The instance containing the event data.
Returns
Type Description
System.Object

The checked value.

CoerceValue(Object)

Fulfils the logic before setting the value of Value dependency property.

Declaration
protected virtual object CoerceValue(object value)
Parameters
Type Name Description
System.Object value

The value that should be corrected.
Returns
Type Description
System.Object

The corrected value.

CoerceValue(DependencyObject, Object)

Coerces the value of the Value property.

Declaration
public static object CoerceValue(DependencyObject d, object value)
Parameters
Type Name Description
System.Windows.DependencyObject d

The CircularPointer object.
System.Object value

The instance containing the event data.
Returns
Type Description
System.Object

The checked value.

GetAngleByValue(Double)

Gets the corresponding angle for scale value passed.

Declaration
protected virtual double GetAngleByValue(double value)
Parameters
Type Name Description
System.Double value

Pointer value.
Returns
Type Description
System.Double

Calculated angle.
Remarks

  • ratioCalculates the number of segments(between Maximum and Minimum values), that are possible,each of "value - Minimum" length.
  • angleCalculate the angles, of interval("value-Minimum") relative to Sweep angle of the Gauge and then adding the StartAngle to get the exact angle to place the Pointer.

MeasureOverride(Size)

Measures the size required for child elements in layout and determines a size for the this element.

Declaration
protected override Size MeasureOverride(Size availableSize)
Parameters
Type Name Description
System.Windows.Size availableSize

The available size that this element can give to child elements.
Returns
Type Description
System.Windows.Size

The size that this element determines it needs during layout.
Remarks

For "Bar" pointer, the height required is 1. For all the remaining pointer types , the size required is equal to their Height and Width.

OnAnglePositionChanged(DependencyPropertyChangedEventArgs)

Updates property value cache and raises AnglePositionChanged event.

Declaration
protected virtual void OnAnglePositionChanged(DependencyPropertyChangedEventArgs e)
Parameters
Type Name Description
System.Windows.DependencyPropertyChangedEventArgs e

Property change details, such as old value and new value.

OnAnimationDurationChanged(DependencyPropertyChangedEventArgs)

Updates property value cache and raises AnimationDurationChanged event.

Declaration
protected virtual void OnAnimationDurationChanged(DependencyPropertyChangedEventArgs e)
Parameters
Type Name Description
System.Windows.DependencyPropertyChangedEventArgs e

Property change details, such as old value and new value.

OnDecrementKeyChanged(DependencyPropertyChangedEventArgs)

Updates property value cache and raises DecrementKeyChanged event.

Declaration
protected virtual void OnDecrementKeyChanged(DependencyPropertyChangedEventArgs e)
Parameters
Type Name Description
System.Windows.DependencyPropertyChangedEventArgs e

Property change details, such as old value and new value.

OnEnablePointerInteractionChanged(DependencyPropertyChangedEventArgs)

Updates property value cache and raises EnablePointerInteractionChanged event.

Declaration
protected virtual void OnEnablePointerInteractionChanged(DependencyPropertyChangedEventArgs e)
Parameters
Type Name Description
System.Windows.DependencyPropertyChangedEventArgs e

Property change details, such as old value and new value.

OnGotFocus(RoutedEventArgs)

Invoked whenever an unhandled System.Windows.UIElement.GotFocus event reaches this element in its route.

Declaration
protected override void OnGotFocus(RoutedEventArgs e)
Parameters
Type Name Description
System.Windows.RoutedEventArgs e

The System.Windows.RoutedEventArgs that contains the event data.

OnIncrementKeyChanged(DependencyPropertyChangedEventArgs)

Updates property value cache and raises IncrementKeyChanged event.

Declaration
protected virtual void OnIncrementKeyChanged(DependencyPropertyChangedEventArgs e)
Parameters
Type Name Description
System.Windows.DependencyPropertyChangedEventArgs e

Property change details, such as old value and new value.

OnInitialized(EventArgs)

Initializes the Circular Pointer.

Declaration
protected override void OnInitialized(EventArgs e)
Parameters
Type Name Description
System.EventArgs e

The System.Windows.RoutedEventArgs that contains the event data.

OnIsAnimationEnabledChanged(DependencyPropertyChangedEventArgs)

Updates property value cache and raises IsAnimationEnabledChanged event.

Declaration
protected virtual void OnIsAnimationEnabledChanged(DependencyPropertyChangedEventArgs e)
Parameters
Type Name Description
System.Windows.DependencyPropertyChangedEventArgs e

Property change details, such as old value and new value.

OnLostFocus(RoutedEventArgs)

Raises the System.Windows.UIElement.LostFocus routed event by using the event data that is provided.

Declaration
protected override void OnLostFocus(RoutedEventArgs e)
Parameters
Type Name Description
System.Windows.RoutedEventArgs e

A System.Windows.RoutedEventArgs that contains event data. This event data must contain the identifier for the System.Windows.UIElement.LostFocus event.

OnMarkerStyleChanged(DependencyPropertyChangedEventArgs)

Updates property value cache and raises MarkerStyleChanged event.

Declaration
protected virtual void OnMarkerStyleChanged(DependencyPropertyChangedEventArgs e)
Parameters
Type Name Description
System.Windows.DependencyPropertyChangedEventArgs e

Property change details, such as old value and new value.

OnNeedleStyleChanged(DependencyPropertyChangedEventArgs)

Updates property value cache and raises NeedleStyleChanged event.

Declaration
protected virtual void OnNeedleStyleChanged(DependencyPropertyChangedEventArgs e)
Parameters
Type Name Description
System.Windows.DependencyPropertyChangedEventArgs e

Property change details, such as old value and new value.

OnPointerLengthChanged(DependencyPropertyChangedEventArgs)

Updates property value cache and raises PointerLengthChanged event.

Declaration
protected virtual void OnPointerLengthChanged(DependencyPropertyChangedEventArgs e)
Parameters
Type Name Description
System.Windows.DependencyPropertyChangedEventArgs e

Property change details, such as old value and new value.

OnPointerNeedleTypeChanged(DependencyPropertyChangedEventArgs)

Updates property value cache and raises PointerNeedleTypeChanged event.

Declaration
protected virtual void OnPointerNeedleTypeChanged(DependencyPropertyChangedEventArgs e)
Parameters
Type Name Description
System.Windows.DependencyPropertyChangedEventArgs e

Property change details, such as old value and new value.

OnPointerPlacementChanged(DependencyPropertyChangedEventArgs)

Updates property value cache and raises PointerPlacementChanged event.

Declaration
protected virtual void OnPointerPlacementChanged(DependencyPropertyChangedEventArgs e)
Parameters
Type Name Description
System.Windows.DependencyPropertyChangedEventArgs e

Property change details, such as old value and new value.

OnPointerWidthChanged(DependencyPropertyChangedEventArgs)

Updates property value cache and raises PointerWidthChanged event.

Declaration
protected virtual void OnPointerWidthChanged(DependencyPropertyChangedEventArgs e)
Parameters
Type Name Description
System.Windows.DependencyPropertyChangedEventArgs e

Property change details, such as old value and new value.

OnRender(DrawingContext)

Participates in rendering operations that are directed by the layout system.

Declaration
protected override void OnRender(DrawingContext drawingContext)
Parameters
Type Name Description
System.Windows.Media.DrawingContext drawingContext

The drawing instructions for a specific element.
Remarks

The shadow offset is calculated according to the CircularGauge and is stored. If the pointer is of type Marker, there is no need to rotate the pointer. All the remaining pointer types are rotated by an angle of 180. The actual pointer and the shadow of the pointer is drawn.(Since the pointer is drawn at the center of the Gauge and then transformed to its actual location,all non-rectangular shaped pointers should be rotated)

OnValueChanged(DependencyPropertyChangedEventArgs)

Updates property value cache and raises ValueChanged event.

Declaration
protected virtual void OnValueChanged(DependencyPropertyChangedEventArgs e)
Parameters
Type Name Description
System.Windows.DependencyPropertyChangedEventArgs e

Property change details, such as old value and new value.
Remarks

Animation is provided whenever the value of the pointer changes. Animation is provided to the pointer between pointer's old position and its new position.

RefreshAnglePosition()

Updates the angle position of the pointer.

Declaration
protected virtual void RefreshAnglePosition()
Remarks

The pointer is set to appropriate angle based on the value of the pointer. If the PointerType is Needle, then a simple rotation of the needle to the appropriate angle is enough. If it is of type Marker, then based on the pointer's ScalePlacement appropriate X position is calculated(Note: All the calculations are done with regard to the original position of the pointer, i.e Center of the Gauge) and the Marker is rotated.

Events

AnglePositionChanged

Event that is raised when Syncfusion.Windows.Gauge.CircularPointer.AnglePosition property is changed.

Declaration
public event PropertyChangedCallback AnglePositionChanged
Event Type
Type
System.Windows.PropertyChangedCallback

AnimationDurationChanged

Event that is raised when AnimationDuration property is changed.

Declaration
public event PropertyChangedCallback AnimationDurationChanged
Event Type
Type
System.Windows.PropertyChangedCallback

DecrementKeyChanged

Event that is raised when DecrementKey property is changed.

Declaration
public event PropertyChangedCallback DecrementKeyChanged
Event Type
Type
System.Windows.PropertyChangedCallback

EnablePointerInteractionChanged

Event that is raised when EnablePointerInteraction property is changed.

Declaration
public event PropertyChangedCallback EnablePointerInteractionChanged
Event Type
Type
System.Windows.PropertyChangedCallback

IncrementKeyChanged

Event that is raised when IncrementKey property is changed.

Declaration
public event PropertyChangedCallback IncrementKeyChanged
Event Type
Type
System.Windows.PropertyChangedCallback

IsAnimationEnabledChanged

Event that is raised when AnimationDuration property is changed.

Declaration
public event PropertyChangedCallback IsAnimationEnabledChanged
Event Type
Type
System.Windows.PropertyChangedCallback

MarkerCustomGeometryChanged

Event that will raise when MarkerCustomGeometry property is changed.

Declaration
public event PropertyChangedCallback MarkerCustomGeometryChanged
Event Type
Type
System.Windows.PropertyChangedCallback

MarkerStyleChanged

Event that is raised when MarkerStyle property is changed.

Declaration
public event PropertyChangedCallback MarkerStyleChanged
Event Type
Type
System.Windows.PropertyChangedCallback

NeedleCustomGeometryChanged

Event that will raise when NeedleCustomGeometry property is changed.

Declaration
public event PropertyChangedCallback NeedleCustomGeometryChanged
Event Type
Type
System.Windows.PropertyChangedCallback

NeedleStyleChanged

Event that is raised when NeedleStyle property is changed.

Declaration
public event PropertyChangedCallback NeedleStyleChanged
Event Type
Type
System.Windows.PropertyChangedCallback

PointerLengthChanged

Event that is raised when PointerLength property is changed.

Declaration
public event PropertyChangedCallback PointerLengthChanged
Event Type
Type
System.Windows.PropertyChangedCallback

PointerNeedleTypeChanged

Event that is raised when PointerNeedleType property is changed.

Declaration
public event PropertyChangedCallback PointerNeedleTypeChanged
Event Type
Type
System.Windows.PropertyChangedCallback

PointerPlacementChanged

Event that is raised when PointerPlacement property is changed.

Declaration
public event PropertyChangedCallback PointerPlacementChanged
Event Type
Type
System.Windows.PropertyChangedCallback

PointerWidthChanged

Event that is raised when PointerWidth property is changed.

Declaration
public event PropertyChangedCallback PointerWidthChanged
Event Type
Type
System.Windows.PropertyChangedCallback

ValueChanged

Event that is raised when Value property is changed.

Declaration
public event PropertyChangedCallback ValueChanged
Event Type
Type
System.Windows.PropertyChangedCallback