这是个C++的图形学划线的演示程序，总结了C++编程的思想，是初学者很好的典范。-This is a C graphics crossed the demo program, summed up the thinking of the C programming is a good model for beginners.

C# 获取RICHTEXTBOX所有图形的位置和大小-C# Gets RICHTEXTBOX location and size of all graphics