[codex] Support radial label rotation in chord chart

src/chart/chord/ChordPiece.ts

@@ -17,7 +17,7 @@
 * under the License.
 */
 
-import { extend, retrieve3 } from 'zrender/src/core/util';
+import { extend, isNumber, retrieve3 } from 'zrender/src/core/util';
 import * as graphic from '../../util/graphic';
 import SeriesData from '../../data/SeriesData';
 import { getSectorCornerRadius } from '../helper/sectorHelper';
@@ -29,6 +29,8 @@ import type { BuiltinTextPosition } from 'zrender/src/core/types';
 import { setStatesStylesFromModel, toggleHoverEmphasis } from '../../util/states';
 import { getECData } from '../../util/innerStore';
 
+const RADIAN = Math.PI / 180;
+
 export default class ChordPiece extends graphic.Sector {
 
     constructor(data: SeriesData, idx: number, startAngle: number) {
@@ -174,15 +176,23 @@ export default class ChordPiece extends graphic.Sector {
             ? normalLabelModel.get('verticalAlign') || 'middle'
             : (dy > 0 ? 'top' : 'bottom');
 
+        let labelRotate = 0;
+        const rotate = normalLabelModel.get('rotate');
+        if (rotate === 'radial') {
+            labelRotate = dx < 0 ? -midAngle + Math.PI : -midAngle;
+        }
+        else if (isNumber(rotate)) {
+            labelRotate = rotate * RADIAN;
+        }
+
         label.attr({
             x: dx * r + layout.cx,
             y: dy * r + layout.cy,
-            rotation: 0,
+            rotation: labelRotate,
             style: {
                 align,
                 verticalAlign
             }
         });
     }
 }
-

src/chart/chord/ChordSeries.ts

@@ -97,9 +97,10 @@ export interface ChordEdgeLineStyleOption extends LineStyleOption {
     curveness?: number
 }
 
-export interface ChordNodeLabelOption extends Omit<SeriesLabelOption<CallbackDataParams>, 'position'> {
+export interface ChordNodeLabelOption extends Omit<SeriesLabelOption<CallbackDataParams>, 'position' | 'rotate'> {
     silent?: boolean
     position?: SeriesLabelOption['position'] | 'outside'
+    rotate?: number | 'radial'
 }
 
 export interface ChordEdgeStateOption {