Class Libraries & REST APIs for the developers to manipulate & process Files from Word, Excel, PowerPoint, Visio, PDF, CAD & several other categories in Web, Desktop or Mobile apps. Develop & deploy on Windows, Linux, MacOS & Android platforms....要指定圆环图中孔的大小,请按照以下步骤操作: 实例化 Presentation 对象。 在幻灯片上添加圆环图。 指定圆环图中孔的大小。...创建 Presentation 类的实例 Presentation pres = new Presentation ();...