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PointFEvaluator

open class PointFEvaluator : TypeEvaluator<PointF!>
kotlin.Any
   ↳ androidx.core.animation.PointFEvaluator

This evaluator can be used to perform type interpolation between PointF values.

Summary

Public constructors

Construct a PointFEvaluator that returns a new PointF on every evaluate call.

<init>(@NonNull reuse: PointF)

Constructs a PointFEvaluator that modifies and returns reuse in evaluate(float, android.graphics.PointF, android.graphics.PointF) calls.

Public methods
open PointF
evaluate(fraction: Float, @NonNull startValue: PointF, @NonNull endValue: PointF)

This function returns the result of linearly interpolating the start and end PointF values, with fraction representing the proportion between the start and end values.

Public constructors

<init>

PointFEvaluator()

Construct a PointFEvaluator that returns a new PointF on every evaluate call. To avoid creating an object for each evaluate call, PointFEvaluator#PointFEvaluator(android.graphics.PointF) should be used whenever possible.

<init>

PointFEvaluator(@NonNull reuse: PointF)

Constructs a PointFEvaluator that modifies and returns reuse in evaluate(float, android.graphics.PointF, android.graphics.PointF) calls. The value returned from evaluate(float, android.graphics.PointF, android.graphics.PointF) should not be cached because it will change over time as the object is reused on each call.

Parameters
reuse PointF: A PointF to be modified and returned by evaluate.

Public methods

evaluate

@NonNull open fun evaluate(
    fraction: Float,
    @NonNull startValue: PointF,
    @NonNull endValue: PointF
): PointF

This function returns the result of linearly interpolating the start and end PointF values, with fraction representing the proportion between the start and end values. The calculation is a simple parametric calculation on each of the separate components in the PointF objects (x, y).

If PointFEvaluator(android.graphics.PointF) was used to construct this PointFEvaluator, the object returned will be the reuse passed into the constructor.

Parameters
fraction Float: The fraction from the starting to the ending values
startValue PointF: The start PointF
endValue PointF: The end PointF
Return
PointF A linear interpolation between the start and end values, given the fraction parameter.