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title: Interpolant category: Core layout: docs

Interpolant

Abstract base class of interpolants over parametric samples.

The parameter domain is one dimensional, typically the time or a path along a curve defined by the data.

The sample values can have any dimensionality and derived classes may apply special interpretations to the data.

This class provides the interval seek in a Template Method, deferring the actual interpolation to derived classes.

Time complexity is O(1) for linear access crossing at most two points and O(log N) for random access, where N is the number of positions.

References: http://www.oodesign.com/template-method-pattern.html

Constructor

new Interpolant( parameterPositions : TypedArray, sampleValues : TypedArray, sampleSize : number, resultBuffer : TypedArray ) (abstract)

Constructs a new interpolant.

parameterPositions | The parameter positions hold the interpolation factors.
---|---
sampleValues | The sample values.
sampleSize | The sample size
resultBuffer | The result buffer.

Properties

.DefaultSettings_ : Object

The default settings object.

.parameterPositions : TypedArray

The parameter positions.

.resultBuffer : TypedArray

The result buffer.

.sampleValues : TypedArray

The sample values.

.settings : Object

The interpolation settings.

Default is null.

.valueSize : TypedArray

The value size.

Methods

.copySampleValue_( index : number ) : TypedArray

Copies a sample value to the result buffer.

index | An index into the sample value buffer.
---|---

Returns: The result buffer.

.evaluate( t : number ) : TypedArray

Evaluate the interpolant at position t.

t | The interpolation factor.
---|---

Returns: The result buffer.

.getSettings_() : Object

Returns the interpolation settings.

Returns: The interpolation settings.

.interpolate_( i1 : number, t0 : number, t : number, t1 : number ) : TypedArray (abstract)

Copies a sample value to the result buffer.

i1 | An index into the sample value buffer.
---|---
t0 | The previous interpolation factor.
t | The current interpolation factor.
t1 | The next interpolation factor.

Returns: The result buffer.

.intervalChanged_( i1 : number, t0 : number, t : number )

Optional method that is executed when the interval has changed.

i1 | An index into the sample value buffer.
---|---
t0 | The previous interpolation factor.
t | The current interpolation factor.

Source

src/math/Interpolant.js