Class FilteredPointList

An example of an IPointList implementation that stores large datasets, and selectively filters the output data depending on the displayed range.

Inheritance
Object
FilteredPointList
Implements
Inherited Members
Namespace: ZedGraph
Assembly: ZedGraph.dll
Syntax
[Serializable]
public class FilteredPointList : IPointList, ICloneable
Remarks

This class will refilter the data points each time SetBounds(Double, Double, Int32) is called. The data are filtered down to MaxPts points, within the data bounds of a minimum and maximum data range. The data are filtered by simply skipping points to achieve the desired total number of points. Input arrays are assumed to be monotonically increasing in X, and evenly spaced in X.

Constructors

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FilteredPointList(Double[], Double[])

Constructor to initialize the PointPairList from two arrays of type double.

Declaration
public FilteredPointList(double[] x, double[] y)
Parameters
Type Name Description
Double[] x
Double[] y
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FilteredPointList(FilteredPointList)

The Copy Constructor

Declaration
public FilteredPointList(FilteredPointList rhs)
Parameters
Type Name Description
FilteredPointList rhs

The FilteredPointList from which to copy

Properties

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Count

Returns the number of points according to the current state of the filter.

Declaration
public int Count { get; }
Property Value
Type Description
Int32
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Item[Int32]

Indexer to access the specified PointPair object by its ordinal position in the list.

Declaration
public PointPair this[int index] { get; set; }
Parameters
Type Name Description
Int32 index

The ordinal position (zero-based) of the PointPair object to be accessed.
Property Value
Type Description
PointPair

A PointPair object reference.
Remarks

Returns Missing for any value of that is outside of its corresponding array bounds.

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MaxPts

Gets the desired number of filtered points to output. You can set this value by calling SetBounds(Double, Double, Int32).

Declaration
public int MaxPts { get; }
Property Value
Type Description
Int32

Methods

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Clone()

Deep-copy clone routine

Declaration
public virtual object Clone()
Returns
Type Description
Object

A new, independent copy of the FilteredPointList
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SetBounds(Double, Double, Int32)

Set the data bounds to the specified minimum, maximum, and point count. Use values of min=double.MinValue and max=double.MaxValue to get the full range of data. Use maxPts=-1 to not limit the number of points. Call this method anytime the zoom range is changed.

Declaration
public void SetBounds(double min, double max, int maxPts)
Parameters
Type Name Description
Double min

The lower bound for the X data of interest
Double max

The upper bound for the X data of interest
Int32 maxPts

The maximum number of points allowed to be output by the filter

Implements

See Also