Add orx-easing

orx-easing/README.md

@@ -0,0 +1,31 @@
+# orx-easing
+
+A collection of easing functions similar to those on https://easings.net
+
+ - `easeLinear`
+ - `easeBackIn`, `easeBackInOut`, `easeBackOut`
+ - `easeBounceIn`, `easeBounceInOut`, `easeBounceOut`
+ - `easeCircIn`, `easeCircInOut`, `easeCircOut`
+ - `easeCubicIn`, `easeCubicInOut` `easeCubicOut`
+ - `easeElasticIn`, `easeElasticInOut`, `easeElasticOut`
+ - `easeExpoIn`, `easeExpoInOut`, `easeExpoOut`
+ - `easeQuadIn`, `easeQuadInOut`, `easeQuadOut`
+ - `easeQuartIn`, `easeQuartInOut`, `easeQuartOut`
+ - `easeQuintIn`, `easeQuintInOut`, `easeQuintOut`
+ - `easeSineIn`, `easeSineInOut`, `easeSineOut`
+
+## usage
+
+`fun easeX(time: Double, bias: Double = 0.0, scale: Double = 1.0, duration : Double = 1.0)`
+
+```kotlin
+// -- when t is in [0, 1]
+val et = easeQuadIn(t)
+val et = easeQuadIn(t, 0.0, 1.0, 10.0)
+```
+
+Using the `Easing` enumeration
+
+```kotlin
+val et = Easing.QuadIn.function(t, 0.0, 1.0, 1.0)
+```