fix: In Line.js (used by graph and markLine), when rotation is not sp…

…ecified by users, the "auto rotation" rule should not be broken when rendered at the second time (like when drag graph or move dataZoom). (Brought by 7c3f189 apache#12392 )

src/chart/helper/Line.js

@@ -57,8 +57,8 @@ function createSymbol(name, lineData, idx) {
     );
 
     // rotate by default if symbolRotate is not specified or NaN
-    symbolPath.rotation = symbolRotate == null || isNaN(symbolRotate)
-        ? undefined
+    symbolPath.__specifiedRotation = symbolRotate == null || isNaN(symbolRotate)
+        ? void 0
         : +symbolRotate * Math.PI / 180 || 0;
     symbolPath.name = name;
 
@@ -131,13 +131,16 @@ function updateSymbolAndLabelBeforeLineUpdate() {
         // when symbol is set to be 'arrow' in markLine,
         // symbolRotate value will be ignored, and compulsively use tangent angle.
         // rotate by default if symbol rotation is not specified
-        if (symbolFrom.rotation == null
-            || (symbolFrom.shape && symbolFrom.shape.symbolType === 'arrow')) {
+        var specifiedRotation = symbolFrom.__specifiedRotation;
+        if (specifiedRotation == null) {
             var tangent = line.tangentAt(0);
             symbolFrom.attr('rotation', Math.PI / 2 - Math.atan2(
                 tangent[1], tangent[0]
             ));
         }
+        else {
+            symbolFrom.attr('rotation', specifiedRotation);
+        }
         symbolFrom.attr('scale', [invScale * percent, invScale * percent]);
     }
     if (symbolTo) {
@@ -146,13 +149,16 @@ function updateSymbolAndLabelBeforeLineUpdate() {
         // when symbol is set to be 'arrow' in markLine,
         // symbolRotate value will be ignored, and compulsively use tangent angle.
         // rotate by default if symbol rotation is not specified
-        if (symbolTo.rotation == null
-            || (symbolTo.shape && symbolTo.shape.symbolType === 'arrow')) {
+        var specifiedRotation = symbolTo.__specifiedRotation;
+        if (specifiedRotation == null) {
             var tangent = line.tangentAt(1);
             symbolTo.attr('rotation', -Math.PI / 2 - Math.atan2(
                 tangent[1], tangent[0]
             ));
         }
+        else {
+            symbolTo.attr('rotation', specifiedRotation);
+        }
         symbolTo.attr('scale', [invScale * percent, invScale * percent]);
     }