add LinearEquation and RangedLinearEquation classes

Author: KamelMohamad

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

@@ -0,0 +1,10 @@
+package io.monstarlab.mosaic.slider
+
+public data class LinearEquation(
+    private val m: Float,
+    private val c: Float,
+) {
+    public fun valueFromOffset(offset: Float): Float = m * offset + c
+
+    public fun offsetFromValue(value: Float): Float = (value - c) / m
+}

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

@@ -0,0 +1,7 @@
+package io.monstarlab.mosaic.slider
+
+public data class RangedLinearEquation(
+    val equation: LinearEquation,
+    val offsetRange: ClosedFloatingPointRange<Float>,
+    val valueRange: ClosedFloatingPointRange<Float>,
+)