chore: move utils to package

packages/utils/math.ts

@@ -0,0 +1,35 @@
+/**
+ * Linear Interpolation
+ */
+export const lerp = (start: number, end: number, amount: number): number => {
+    return (1 - amount) * start + amount * end
+}
+
+
+/**
+ * Clamp a number
+ */
+export const clamp = (num: number, a: number, b: number) => {
+    return Math.max(Math.min(num, Math.max(a, b)), Math.min(a, b))
+}
+
+
+/**
+ * Re-maps a number from one range to another
+ * @param value the incoming value to be converted
+ * @param start1 lower bound of the value's current range
+ * @param stop1 upper bound of the value's current range
+ * @param start2 lower bound of the value's target range
+ * @param stop2 upper bound of the value's target range
+ * @param [withinBounds] constrain the value to the newly mapped range
+ * @return remapped number
+ */
+export const map = (n: number, start1: number, stop1: number, start2: number, stop2: number, withinBounds: boolean): number => {
+    const value = (n - start1) / (stop1 - start1) * (stop2 - start2) + start2
+    if (!withinBounds) return value
+    if (start2 < stop2) {
+        return clamp(value, start2, stop2)
+    } else {
+        return clamp(value, stop2, start2)
+    }
+}