如何从box2D中的Body*获得灯具的Shape点数？

// 获取Body的第一个Fixture
b2Fixture* fixture = body->GetFixtureList();

// 获取Fixture的Shape
b2Shape* shape = fixture->GetShape();

// 根据Shape的类型获取点数
switch (shape->GetType()) {
    case b2Shape::e_circle:
        // 获取圆形的点数
        b2CircleShape* circle = static_cast<b2CircleShape*>(shape);
        int pointCount = 1;
        break;
    case b2Shape::e_polygon:
        // 获取多边形的点数
        b2PolygonShape* polygon = static_cast<b2PolygonShape*>(shape);
        int pointCount = polygon->GetVertexCount();
        break;
    case b2Shape::e_edge:
        // 获取边缘的点数
        b2EdgeShape* edge = static_cast<b2EdgeShape*>(shape);
        int pointCount = 2;
        break;
    default:
        // 其他形状的点数
        int pointCount = 0;
        break;
}