虽然系统有给出划圆的直接的函数，但是没有让读者了解具体的计算机系统内部的绘制过程，本程序以顺圆为例，以逐点逼近法画出了并且是可以从任意点开始的顺圆的程序-Although the system is given a round of direct function, but did not allow the reader to understand the specific computer systems within the mapping process, the procedures

线刷子的线帽法，借助演示了线宽为三个像素点的直线的方法，演示了线刷子线帽法画直线的过程。-line brush line apparatus, with a linewidth of the demonstration three pixels of the line, the line demonstration brush painting lines cap linear process.

基于MATLAB的FIR带阻数字滤波器的设计 由于生物医学信号处理过程中易混入50Hz噪声的特点，本文利用程序设计法和FDATool设计法-Based on the MATLAB FIR digital filters with resistance of biomedical signal processing design due process characteristics of noise, with isolator using the program design method a