Stop unnecessary line calculations (#6671)

diff --git a/src/controllers/controller.line.js b/src/controllers/controller.line.js
index 350e53999ca1cffaf3657ed5fa7df159e351f23f..4f452d66d0abf8d0e81d1ecba6d495d902864d6e 100644 (file)
--- a/src/controllers/controller.line.js
+++ b/src/controllers/controller.line.js
@@ -229,12 +229,13 @@ module.exports = DatasetController.extend({
                var yScale = me._yScale;
                var sumPos = 0;
                var sumNeg = 0;
-               var rightValue = +yScale.getRightValue(value);
-               var metasets = chart._getSortedVisibleDatasetMetas();
-               var ilen = metasets.length;
-               var i, ds, dsMeta, stackedRightValue;
+               var i, ds, dsMeta, stackedRightValue, rightValue, metasets, ilen;
 
                if (yScale.options.stacked) {
+                       rightValue = +yScale.getRightValue(value);
+                       metasets = chart._getSortedVisibleDatasetMetas();
+                       ilen = metasets.length;
+
                        for (i = 0; i < ilen; ++i) {
                                dsMeta = metasets[i];
                                if (dsMeta.index === datasetIndex) {