yanghui

本代码实现了一个地图比例尺的功能，方便各种地图类型代码的基本控件使用(This code implements a function of map scale to facilitate a variety of map types of code to use the basic controls)

NT9200数字脑电图仪 的串行通讯及实时绘图程序。可借鉴里面的绘图程序。(NT9200 digital EEG instrument serial communications and real-time drawing program. Inside of the mapping process can learn from.)

国外高手写的可以读写dxf格式信息。值得收藏(Foreign experts to write the information can be read dxf format. Worth collecting)

基于Bresenham算法的四步画直线算法,加快画直线速度(draw line based Bresenham update alogrith)

VB编写的画图板，使用方便可以帮助代码学习。。(VB prepared the drawing board, easy to use can help the code to learn. .)

本程序可以在MFC中打开并显示一张图片，代码比较简单基础(Open and display a picture in MFC)

OpenSceneGraph Quick Start Guide(The OpenSceneGraph the Quick Start Guide)

很好的齿轮cad参数化设计程序，能够进行直齿轮和斜齿轮的参数化设计和cad绘图输出(Cad good gear parametric design process, can spur gear and helical gear parametric design and cad graphics output)

说明：  三次B样条,程序中有部分说明,可以自由在其中进行扩展设计其它类似样条程序.(cubic B-spline, some procedures that can be carried out in one free expansion design similar kind of procedure.)

图形学上机实验，用三种算法画线。包括Bresenham画线算法、中点画线和数值微分画线算法(Graphics on an experiment with three algorithms draw the line. Bresenham line algorithm, the dotted line and numerical differential line drawing algorithm)