From aaad484aa397b45a156080442b3c295da455ec8f Mon Sep 17 00:00:00 2001
From: Jay Zhou <190699450+jayzhou2309@users.noreply.github.com>
Date: Fri, 2 Oct 2026 11:38:03 +0800
Subject: [PATCH 1/2] test(polar): cover radiusAxis axisTick.inside and
 axisLabel.inside

---
 .../ut/spec/component/axis/radiusAxis.test.ts | 67 +++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 test/ut/spec/component/axis/radiusAxis.test.ts

diff --git a/test/ut/spec/component/axis/radiusAxis.test.ts b/test/ut/spec/component/axis/radiusAxis.test.ts
new file mode 100644
index 0000000000..996cdd601f
--- /dev/null
+++ b/test/ut/spec/component/axis/radiusAxis.test.ts
@@ -0,0 +1,67 @@
+/*
+* Licensed to the Apache Software Foundation (ASF) under one
+* or more contributor license agreements.  See the NOTICE file
+* distributed with this work for additional information
+* regarding copyright ownership.  The ASF licenses this file
+* to you under the Apache License, Version 2.0 (the
+* "License"); you may not use this file except in compliance
+* with the License.  You may obtain a copy of the License at
+*
+*   http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing,
+* software distributed under the License is distributed on an
+* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+* KIND, either express or implied.  See the License for the
+* specific language governing permissions and limitations
+* under the License.
+*/
+
+
+import { EChartsType } from '../../../../../src/echarts';
+import { createChart, getGraphicElements } from '../../../core/utHelper';
+import { Line, Text } from '../../../../../src/util/graphic';
+
+describe('radiusAxis', function () {
+
+    let chart: EChartsType;
+    beforeEach(function () {
+        chart = createChart({ width: 400, height: 400 });
+    });
+    afterEach(function () {
+        chart.dispose();
+    });
+
+    // The radius axis runs from the polar center (200, 200) along +x when
+    // angleAxis.startAngle is 0, so ticks and labels sit above (y < 200)
+    // or below (y > 200) it.
+    function render(inside: boolean) {
+        chart.setOption({
+            animation: false,
+            angleAxis: { startAngle: 0 },
+            radiusAxis: {
+                type: 'category',
+                data: ['Mon', 'Tue', 'Wed', 'Thu'],
+                axisTick: { inside },
+                axisLabel: { inside }
+            },
+            polar: { center: ['50%', '50%'] },
+            series: [{ type: 'bar', data: [1, 2, 3, 4], coordinateSystem: 'polar' }]
+        });
+        const els = getGraphicElements(chart, 'radiusAxis');
+        const tick = els.find(el => el.anid && el.anid.startsWith('ticks_')) as Line;
+        const label = els.find(el => el instanceof Text && el.style.text === 'Mon') as Text;
+        return {
+            tickEndY: tick.shape.y2 - tick.shape.y1,
+            labelSide: Math.sign(label.y - 200)
+        };
+    }
+
+    it('should draw ticks and labels on the default side', function () {
+        expect(render(false)).toEqual({ tickEndY: -5, labelSide: -1 });
+    });
+
+    it('should flip ticks and labels with axisTick.inside and axisLabel.inside', function () {
+        expect(render(true)).toEqual({ tickEndY: 5, labelSide: 1 });
+    });
+});

From 3075024e983d978fb017713be99696a51193a596 Mon Sep 17 00:00:00 2001
From: Jay Zhou <190699450+jayzhou2309@users.noreply.github.com>
Date: Fri, 2 Oct 2026 11:38:35 +0800
Subject: [PATCH 2/2] fix(polar): respect radiusAxis axisTick.inside and
 axisLabel.inside. close #17434

---
 src/component/axis/RadiusAxisView.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/component/axis/RadiusAxisView.ts b/src/component/axis/RadiusAxisView.ts
index f1c3f464c3..92e3101790 100644
--- a/src/component/axis/RadiusAxisView.ts
+++ b/src/component/axis/RadiusAxisView.ts
@@ -223,8 +223,8 @@ function layoutAxis(polar: Polar, radiusAxisModel: RadiusAxisModel, axisAngle: n
     return {
         position: [polar.cx, polar.cy],
         rotation: axisAngle / 180 * Math.PI,
-        labelDirection: -1 as const,
-        tickDirection: -1 as const,
+        labelDirection: radiusAxisModel.get(['axisLabel', 'inside']) ? 1 as const : -1 as const,
+        tickDirection: radiusAxisModel.get(['axisTick', 'inside']) ? 1 as const : -1 as const,
         nameDirection: 1 as const,
         labelRotate: radiusAxisModel.getModel('axisLabel').get('rotate'),
         // Over splitLine and splitArea