Class TNaturalNeighborInterpolator

Unit

NatNeigh

Declaration

type TNaturalNeighborInterpolator = class(TObject)

Description

TNaturalNeighborInterpolator performs Natural Neighbor interpolation on a set of points.

Usage: The user must first determine the limits in the X and Y directions over which interpolation will be performed. Those limits are passed to the constructor along with the X and Y coordinates of the points used for interpolation and the values associated with those points. If the locations of the points defines the limits over which interpolation will be performed, the second overloaded version of Create can be used in which only the coordinates and the values are passed to the constructor. TNaturalNeighborInterpolator will determine the limits of the points and pass those to the first version of Create. Call Interpolate to find the interpolated value.

TNaturalNeighborInterpolator is slower than TNaturalNeighborInterpolatorTripack.

Hierarchy

• TObject
• TNaturalNeighborInterpolator

Overview

Fields

	FVoronoiPolygons: TList;
	FStartingPoints: array of integer;
	FVoronoi: TVoronoiDiagram;
	FValues: TFloatArray;
	FQuadTree: TRbwQuadTree;

Methods

	function GetGpcPolygon(DelaunayNodeIndex: integer): TGpcPolygonClass;
	procedure SetTestPolygonGeometry(VertexPositions: TLongIntList; Vertices: TVertexList; var TestPolygon: TGpcPolygonClass);
	procedure FillVoronoiDiagram(const X, Y: TFloatArray; XHigh, XLow, YHigh, YLow: Extended); virtual;
	constructor Create(const X, Y, Values: TFloatArray; XLow, YLow, XHigh, YHigh: real); overload;
	constructor Create(const X, Y, Values: TFloatArray); overload;
	destructor Destroy; override;
	function Interpolate(const X, Y: double): double;

Properties

property GpcPolygon[Index:integer]: TGpcPolygonClass read GetGpcPolygon;

Description

Fields

	FVoronoiPolygons: TList;

	FStartingPoints: array of integer;

	FVoronoi: TVoronoiDiagram;

	FValues: TFloatArray;

	FQuadTree: TRbwQuadTree;

Methods

	function GetGpcPolygon(DelaunayNodeIndex: integer): TGpcPolygonClass;

	procedure SetTestPolygonGeometry(VertexPositions: TLongIntList; Vertices: TVertexList; var TestPolygon: TGpcPolygonClass);

	procedure FillVoronoiDiagram(const X, Y: TFloatArray; XHigh, XLow, YHigh, YLow: Extended); virtual;

	constructor Create(const X, Y, Values: TFloatArray; XLow, YLow, XHigh, YHigh: real); overload;

	constructor Create(const X, Y, Values: TFloatArray); overload;

	destructor Destroy; override;

	function Interpolate(const X, Y: double): double;

Properties

	property GpcPolygon[Index:integer]: TGpcPolygonClass read GetGpcPolygon;