pissang commented on code in PR #16895:
URL: https://github.com/apache/echarts/pull/16895#discussion_r862281213


##########
src/coord/Axis.ts:
##########
@@ -129,7 +129,12 @@ class Axis {
             fixExtentWithBands(extent, (scale as OrdinalScale).count());
         }
 
-        return linearMap(data, NORMALIZED_EXTENT, extent, clamp);
+        if ((extent[0] === extent[1]) && (data < 0 || data > 1)) {
+            return data * extent[0] * 2;

Review Comment:
   I still think the equation used here is too tricky. It heavily depends on 
what the data is and can't be explained when data is not -0.5 or 1.5. 



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