fix(Math): Extend API for extracting min/max of an array

Kitware · Aug 22, 2019 · 3472ce7 · 3472ce7
1 parent 5eef245
commit 3472ce7
Showing 1 changed file with 20 additions and 4 deletions.
diff --git a/Sources/Common/Core/Math/index.js b/Sources/Common/Core/Math/index.js
@@ -49,9 +49,9 @@ export function degreesFromRadians(rad) {
 
 export const { round, floor, ceil, min, max } = Math;
 
-export function arrayMin(arr) {
+export function arrayMin(arr, offset = 0, stride = 1) {
   let minValue = Infinity;
-  for (let i = 0, len = arr.length; i < len; ++i) {
+  for (let i = offset, len = arr.length; i < len; i += stride) {
     if (arr[i] < minValue) {
       minValue = arr[i];
     }
@@ -60,9 +60,9 @@ export function arrayMin(arr) {
   return minValue;
 }
 
-export function arrayMax(arr) {
+export function arrayMax(arr, offset = 0, stride = 1) {
   let maxValue = -Infinity;
-  for (let i = 0, len = arr.length; i < len; ++i) {
+  for (let i = offset, len = arr.length; i < len; i+= stride) {
     if (maxValue < arr[i]) {
       maxValue = arr[i];
     }
@@ -71,6 +71,21 @@ export function arrayMax(arr) {
   return maxValue;
 }
 
+export function arrayRange(arr, offset = 0, stride = 1) {
+  let minValue = Infinity;
+  let maxValue = -Infinity;
+  for (let i = offset, len = arr.length; i < len; i += stride) {
+    if (arr[i] < minValue) {
+      minValue = arr[i];
+    }
+    if (maxValue < arr[i]) {
+      maxValue = arr[i];
+    }
+  }
+
+  return [minValue, maxValue];
+}
+
 export const ceilLog2 = notImplemented('ceilLog2');
 export const factorial = notImplemented('factorial');
 
@@ -2070,6 +2085,7 @@ export default {
   max,
   arrayMin,
   arrayMax,
+  arrayRange,
   isPowerOfTwo,
   nearestPowerOfTwo,
   factorial,