我使用setStrokeJoin()的时候,曲线连接处没有效果 about skity HOT 3 CLOSED

    skity::Paint paint;
    paint.setStyle(skity::Paint::kStroke_Style);
    paint.setAntiAlias(true);
    paint.setStrokeWidth(6.f);
    paint.setStrokeJoin(skity::Paint::kRound_Join);
    paint.setStrokeColor(1, 0, 0x0, 1.f);
    skity::Path path;
    path.moveTo(20, 80);
    path.lineTo(20, 30);
    path.cubicTo(80, 0, 50, 50, 80, 80);
    canvas->drawPath(path, paint);