feat(stack): able to reverse the stack order

src/processor/dataStack.ts

@@ -69,15 +69,34 @@ export default function dataStack(ecModel: GlobalModel) {
                 return;
             }
 
-            stackInfoList.length && data.setCalculationInfo(
-                'stackedOnSeries', stackInfoList[stackInfoList.length - 1].seriesModel
-            );
-
             stackInfoList.push(stackInfo);
         }
     });
 
-    stackInfoMap.each(calculateStack);
+    // Process each stack group
+    stackInfoMap.each(function (stackInfoList) {
+        if (stackInfoList.length === 0) {
+            return;
+        }
+        // Check if stack order needs to be reversed
+        const firstSeries = stackInfoList[0].seriesModel;
+        const stackOrder = firstSeries.get('stackOrder') || 'seriesAsc';
+
+        if (stackOrder === 'seriesDesc') {
+            stackInfoList.reverse();
+        }
+
+        // Set stackedOnSeries for each series in the final order
+        each(stackInfoList, function (stackInfo, index) {
+            stackInfo.data.setCalculationInfo(
+                'stackedOnSeries',
+                index > 0 ? stackInfoList[index - 1].seriesModel : null
+            );
+        });
+
+        // Calculate stack values
+        calculateStack(stackInfoList);
+    });
 }
 
 function calculateStack(stackInfoList: StackInfo[]) {

src/util/types.ts

@@ -1679,6 +1679,7 @@ export interface SeriesLargeOptionMixin {
 export interface SeriesStackOptionMixin {
     stack?: string
     stackStrategy?: 'samesign' | 'all' | 'positive' | 'negative';
+    stackOrder?: 'seriesAsc' | 'seriesDesc'; // default: seriesAsc
 }
 
 type SamplingFunc = (frame: ArrayLike<number>) => number;