fix: tooptip position offset in dodgeX (#6483)

__tests__/plots/bugfix/index.ts

@@ -1,2 +1,3 @@
 export { issue6396 } from './issue-6396';
 export { issue6399 } from './issue-6399';
+export { issueChart2719 } from './issue-chart-2719';

__tests__/plots/bugfix/issue-chart-2719.ts

@@ -0,0 +1,41 @@
+import { Chart } from '../../../src';
+
+export function issueChart2719(context) {
+  const { container, canvas } = context;
+  const chart = new Chart({
+    container: container,
+    canvas,
+  });
+
+  chart.options({
+    type: 'interval',
+    data: {
+      type: 'fetch',
+      value:
+        'https://gw.alipayobjects.com/os/antfincdn/iPY8JFnxdb/dodge-padding.json',
+    },
+    encode: {
+      x: '月份',
+      y: '月均降雨量',
+      color: 'name',
+    },
+    transform: [
+      {
+        type: 'dodgeX',
+        padding: 0,
+      },
+    ],
+    interaction: {
+      tooltip: {
+        shared: true,
+      },
+    },
+  });
+
+  const finished = chart.render();
+
+  return {
+    chart,
+    finished,
+  };
+}

src/interaction/tooltip.ts

@@ -1001,7 +1001,14 @@ export function tooltip(
   const scaleSeries = scale.series;
   const bandWidth = scaleX?.getBandWidth?.() ?? 0;
   const xof = scaleSeries
-    ? (d) => d.__data__.x
+    ? (d) => {
+        const seriesCount = Math.round(1 / scaleSeries.valueBandWidth);
+        return (
+          d.__data__.x +
+          d.__data__.series * bandWidth +
+          bandWidth / (seriesCount * 2)
+        );
+      }
     : (d) => d.__data__.x + bandWidth / 2;
 
   // Sort for bisector search.
@@ -1023,6 +1030,7 @@ export function tooltip(
         const search = bisector(xof).center;
         const i = search(elements, abstractX);
         const target = elements[i];
+
         if (!shared) {
           // For grouped bar chart without shared options.
           const isGrouped = elements.find(