介绍了GDI+对几何线条创建、应用等基本方法，并以实例的方式对其中难于理解的部分提供了示例代码，实现了原先GDI不易实现的功能-introduced GDI to create geometric lines, the application of the basic approach and examples of the way in which it difficult to understand some of the sample code to achieve the original GDI difficult to realize the function