fix(bar): fix bar background incorrect on polar

src/chart/bar/BarView.js

@@ -144,7 +144,10 @@ export default echarts.extendChartView({
                     var bgLayout = getLayout[coord.type](data, dataIndex);
                     var bgEl = createBackgroundEl(coord, isHorizontalOrRadial, bgLayout);
                     bgEl.useStyle(backgroundModel.getBarItemStyle());
-                    bgEl.setShape('r', barBorderRadius);
+                    // Only cartesian2d support borderRadius.
+                    if (coord.type === 'cartesian2d') {
+                        bgEl.setShape('r', barBorderRadius);
+                    }
                     bgEls[dataIndex] = bgEl;
                 }
 
@@ -181,7 +184,10 @@ export default echarts.extendChartView({
                 if (drawBackground) {
                     var bgEl = oldBgEls[oldIndex];
                     bgEl.useStyle(backgroundModel.getBarItemStyle());
-                    bgEl.setShape('r', barBorderRadius);
+                    // Only cartesian2d support borderRadius.
+                    if (coord.type === 'cartesian2d') {
+                        bgEl.setShape('r', barBorderRadius);
+                    }
                     bgEls[newIndex] = bgEl;
 
                     var bgLayout = getLayout[coord.type](data, newIndex);

test/bar-background.html

@@ -227,7 +227,7 @@ under the License.
                 var chart = testHelper.create(echarts, 'main1', {
                     option: option,
                     title: [
-                        'large mode'
+                        'Background with large render mode.'
                     ]
                 });
             });
@@ -299,7 +299,7 @@ under the License.
                 var chart = testHelper.create(echarts, 'main2', {
                     option: option,
                     title: [
-                        'normal bars'
+                        'Background with normal render mode.'
                     ]
                 });
             });
@@ -345,7 +345,7 @@ under the License.
                 var chart = testHelper.create(echarts, 'main3', {
                     option: option,
                     title: [
-                        'polar bars'
+                        'Bar background on radial polar'
                     ]
                 });
             });
@@ -392,7 +392,7 @@ under the License.
                 var chart = testHelper.create(echarts, 'main4', {
                     option: option,
                     title: [
-                        'polar bars'
+                        'Bar background on tangential polar'
                     ]
                 });
             });
@@ -446,7 +446,7 @@ under the License.
                 var chart = testHelper.create(echarts, 'main5', {
                     option: option,
                     title: [
-                        'polar bars'
+                        'Multiple bar series with background on radial polar'
                     ]
                 });
             });