DDA、Bresenham、MidBresenham画直线算法

一个简单的画图程序，适合了解和学习C++画图，(a simple draw program)

建立图形的三角分割，能够自动生成三角网格。具有多种增强功能，比如加密网格(INITMESH Build an initial PDE triangular mesh)

可将.txt数据转化为grd数据，用于grads画站点图(.txt data can be converted to GRD data for grads drawing site map.)

本程序实现了计算机图形学的一些重要算法（画直线，画圆，画椭圆，区域填充，图形裁剪，齿轮生成，三次样条曲线等等），源码和可执行程序均打包于文件中(this program is implemented some important algorithm of computer graphics such as drawing lines,drawing circles,drawing ellipse,area filling,Graphics clipping，gear wheel generation ，three times spline curve and so on），source code and executable files are all included in the compressed file。 )

说明：  初学者常用的matlab绘图代码及讲解课件(Matlab drawing codes and instructional courseware commonly used by beginners)

说明：  c#语言 Devexpress设计的界面。 基于ArcEngine的基础设计 包括：打开、保存、另存地图文档， 地图的放大、缩小、平移等， 图层的移动、删除、显示属性表等， 绘制图形:画线、画面、画圆、画矩形等， 空间数据的导入等。(c# language Devexpress design interface. ArcEngine based on the design include: Open, Save, Save the map document, map zoom, pan, etc., layers move, delete, display the property sheet, etc., draw the graph: draw lines, pictures, circle, rectangle and other spatial data import and so on.)

b样条曲线程序和gui界面，输入参数画出曲线(B-spline curve program and GUI interface, input parameters to draw the curve)

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：  程序可用于时序潮流的电压绘图，使用网格渐变颜色表示电压幅值变化(The program can be used for voltage mapping of sequential flow)

实现三角形的类、用类的继承关系编写程序描述下图1中的类层次(Write a class Triangle Triangle、Class inheritance relationships with programming description Figure 1 class hierarchy)