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说明：  python画柱状图，python画散点图，python画双y轴图，python画柱状图，python画散点图，python画双y轴图(Python draws a histogram)

说明：  基于autolisp快速绘制钢结构（尤其钢箱梁）横断面(Rapid Drawing of Cross Sections of Steel Structures (especially Steel Box Girders) Based on Autolisp)

本代码是进行齿轮参数设计和参数校核，参数化绘制二维工程图的源代码(gear parameters for the design and verification parameters, parametric mapping of two-dimensional engineering drawings source code)

资源描述仿PhotoShop旋转图层的方式，设计一个用于旋转的矩形框。

PSCAD基于两端两电平的柔性直流输电模型，对于研究直流输电建模是一个非常好的参考！(HVDC flexible model based on the two ends of PSCAD level, the study HVDC modeling is a very good reference!)

测量弧的线性长度并在绘图平面标注弧长。arcdim(The linear length measuring arc and arc length dimension in the drawing plane. arcdim)

使用MFC创建单文档程序，在界面上画圆，单击可使圆放大、变色(MFC SDI DRAW CIRCLE, CLICK TO INFLATE THE CIRCLE AND CHANGE ITS COLOR)

用mtlab编程绘制光学系统的光学传递函数mtf曲线(we can plot MTF curve by MATLAB )

该VB程序可以将外部输入的数据以图形的方式画出，提供了一个参考,并有图形刷新功能，很详细的介绍了VB的画图功能(The VB program can draw the external input of data in graphical form, to provide a reference, and graphics refresh function, a very detailed description of the VB drawing functions )

分形几何是数学领域里新兴的课题,如果将图形的每个元素按某种规则进行变形,得到新的图形,以此类推,进行若干次变形后得到的图形就是分形图形。本程序实现分形图。(Fractal geometry is the mathematical field of emerging issues, if the graphics of each element according to certain rules of deformation, new graphics, and so on, to carry out a number of graphics after deformation is fractal graphics. This procedure realize fractals.)