update at 2026-01-23 12:07:22

src/utils.ts

@@ -92,7 +92,7 @@ export function annularSectorCentroid(params: AnnularSectorParams): CentroidResu
     return { cx: 0, cy: 0, rho: 0, aMidDeg, aMidRad, deltaDeg };
   }
 
-  // rho = (2/3) * (r2^3 - r1^3)/(r2^2 - r1^2) * sinc(delta/2)
+  // 形心径向距离公式：`rho = (2/3) * (r2^3 - r1^3)/(r2^2 - r1^2) * sinc(delta/2)`
   const delta = (deltaDeg * Math.PI) / 180;
   const radialFactor =
     (2 / 3) * ((rOuter ** 3 - rInner ** 3) / (rOuter ** 2 - rInner ** 2));
@@ -124,7 +124,7 @@ export function annularSectorPath(
   let delta = a2 - a1;
   if (delta < 0) delta += 360;
 
-  // SVG arc flags
+  // `SVG` 圆弧标记位
   const largeArc = delta > 180 ? 1 : 0;
   const sweepOuter = 1;
   const sweepInner = 0;
@@ -134,7 +134,7 @@ export function annularSectorPath(
   const p3 = polarToXY(a2, rInner);
   const p4 = polarToXY(a1, rInner);
 
-  // 如果 rInner=0，内弧退化为点
+  // 如果 `rInner`=0，内弧退化为点
   if (rInner <= 0.000001) {
     return [
       `M ${p1.x} ${p1.y}`,