实现了各种工业图形的绘制，柱状图，圆形图，线性图等等。内容丰富，很值得学习。就是有些函数还是看不懂，这里供更多人参考-Realization of the drawing, various industrial pattern histogram, pie chart, line graph etc.. Rich in content, it is worth learning. Is some function still cannot read, more people here for r