l_curve

体积小巧曲线控件没，实现一般曲线的各种画法，虽然很简单但很好用。(compact design Curve Controls did not achieve normal curve of the painting, although very simple but very good use.)

三角形判断问题。可用于黑盒测试用例设计。(Triangle judgment. Can be used for black-box test case design.)

AUTOCAD 程序员使用的，ARX图纸数据结构显示(AutoCAD programmers using the data structure ARX drawings show)

说明：  mfc下绘出样条曲线，并根据样条曲线对其上的值进行差值。(mfc-spline curves plotted under and in accordance with spline curve on the value of their difference.)

利用逐点法绘制出图形，图形的绘制其实都是由折线组成的，只是每条折线的误差太小了，肉眼根本分辨不出来(use of the point-by-point drawing graphics, the graphics are actually drawn from the composition of the dogleg, only broken each of error is too small, the human eye can not be seen)

能够对通达信.lc5文件进行修改，主要是修改分钟数，这样可以在两年多的数据中进行画线处理(Mastery letter. Lc5 file to be modified, modify the number of minutes, so you can draw lines in more than two years of data)

Gompertz（龚伯次）曲线模型被广泛应用在预测中，该代码实现了G曲线的预测功能。(Gompertz curve is widely used in prediction, this code will help achieve the Gompertz curve prediction function.)

说明：  通过使用dxflib库，对dxf文件进行读取(Read DXF files by using the dxflib Library)

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)

ACIS的动态链接库，是AUTO CAD的几何内核(The dynamic link library ACIS is AUTO CAD geometry kernel)