PointFEvaluator

class PointFEvaluator : TypeEvaluator


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.

Constructs a PointFEvaluator that modifies and returns reuse in evaluate calls.

Public functions

PointF
evaluate(fraction: Float, startValue: PointF, 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

PointFEvaluator

PointFEvaluator()

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

PointFEvaluator

PointFEvaluator(reuse: PointF)

Constructs a PointFEvaluator that modifies and returns reuse in evaluate calls. The value returned from evaluate 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 functions

evaluate

fun evaluate(fraction: Float, startValue: PointF, 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 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

Returns
PointF

A linear interpolation between the start and end values, given the fraction parameter.