add valueToFraction and fractionToValue functions

Author: KamelMohamad

slider/src/main/java/io/monstarlab/mosaic/slider/MathUtils.kt

@@ -7,3 +7,15 @@ internal fun scale(a1: Float, b1: Float, x1: Float, a2: Float, b2: Float) =
 
 internal fun calcFraction(a: Float, b: Float, pos: Float) =
     (if (b - a == 0f) 0f else (pos - a) / (b - a)).coerceIn(0f, 1f)
+
+internal fun Float.valueToFraction(rangeStart: Float, rangeEnd: Float) =
+    calcFraction(rangeStart, rangeEnd, this)
+
+internal fun Float.valueToFraction(range: ClosedFloatingPointRange<Float>) =
+    valueToFraction(range.start, range.endInclusive)
+
+internal fun Float.fractionToValue(rangeStart: Float, rangeEnd: Float): Float =
+    scale(0f, 1f, this.coerceIn(0f,1f), rangeStart, rangeEnd)
+
+internal fun Float.fractionToValue(range: ClosedFloatingPointRange<Float>): Float =
+    scale(0f, 1f, this, range.start, range.endInclusive)