实现直线算法的模拟，系计算机图形学的类容，直线的三种实现方法-Linear algorithm simulation, the Department of Computer Graphics class capacity, the three straight-line method

计算二维上点到直线段之间的最短距离。如果是直线那么连垂线就是最短距离，但直线段则不然。-Calculated on two-dimensional point to a straight line the shortest distance between the paragraph. Well, even if it is a straight line perpendicular is the shortest distance, but the line segment is not.

提供12864的LCD上的画点和画线函数，方便单片机调用，只要将相应的控制线和数据线与单片机的IO口连接起来就可以使用。-12864 on the LCD to provide the draw points and draw line function, Convenience Singlechip call, as long as the corresponding control lines and data lines with the MCU IO I connect you can

使用C++实现画出点线，并设计了撤销和恢复功能，帮助初学者理解C++中的图形设置-Use C++, draw points and lines, and undo and redo capabilities designed to help beginners understand the C++ in the graphics settings