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Mathematic library for Multiplatform Kotlin 1.3

There is a newer version: 4.0.10

package korlibs.math.interpolation

import korlibs.datastructure.fastCastTo
import korlibs.math.geom.*

interface Interpolable {
    fun interpolateWith(ratio: Ratio, other: T): T
}

interface MutableInterpolable {
    fun setToInterpolated(ratio: Ratio, l: T, r: T): T
}

fun Ratio.interpolate(l: Point, r: Point): Point = Point(interpolate(l.x, r.x), interpolate(l.y, r.y))
fun Ratio.interpolate(l: Size, r: Size): Size = Size(interpolate(l.width, r.width), interpolate(l.height, r.height))
fun Ratio.interpolate(l: Scale, r: Scale): Scale = Scale(interpolate(l.scaleX, r.scaleX), interpolate(l.scaleY, r.scaleY))
fun Ratio.interpolate(l: Float, r: Float): Float = (l + (r - l) * valueF)
fun Ratio.interpolate(l: Double, r: Double): Double = (l + (r - l) * valueD)
fun Ratio.interpolate(l: Int, r: Int): Int = (l + (r - l) * valueD).toInt()
fun Ratio.interpolate(l: Long, r: Long): Long = (l + (r - l) * valueD).toLong()
fun  Ratio.interpolate(l: Interpolable, r: Interpolable): T = l.interpolateWith(this, r.fastCastTo())
fun > Ratio.interpolate(l: T, r: T): T = l.interpolateWith(this, r)

fun Ratio.interpolate(l: Matrix, r: Matrix): Matrix = Matrix.interpolated(l, r, this)
fun Ratio.interpolate(l: MatrixTransform, r: MatrixTransform): MatrixTransform = MatrixTransform.interpolated(l, r, this)
fun Ratio.interpolate(l: Rectangle, r: Rectangle): Rectangle = Rectangle.interpolated(l, r, this)